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Instruction Manual
XP BOILER
MODELS: XB/XW
1000, 1300, 1700
2000, 2600, 3400
SERIES 100/101
25589 Highway 1
McBee, SC 29101
WARNING: If the information in these
instructions is not followed exactly, a fire
or explosion may result causing property
damage, personal injury or death.
MAINTENANCE - LIMITED WARRANTY
INSTALLATION - OPERATION -
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
•
Do not touch any electrical switch; do
•
not use any phone in your building.
Immediately call your gas supplier
•
from a neighbor’s phone. Follow the
gas supplier’s instructions.
If you cannot reach your gas supplier,
•
call the fire department.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
Thank you for buying this energy efcient boiler.
We appreciate your condence in our products.
PRINTED IN THE U.S.A. 0711 320741-002
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TABLE OF CONTENTS
TABLE OF CONTENTS ..........................................................................2
SAFE INSTALLATION, USE AND SERVICE.......................................... 3
GENERAL SAFETY................................................................................ 4
INTRODUCTION .................................................................................... 5
Model Identication ............................................................................ 5
Abbreviations Used ........................................................................... 5
Qualications ..................................................................................... 5
DIMENSIONS AND CAPACITY DATA .................................................... 6
FEATURES AND COMPONENTS ....................................................... 10
Component Description ................................................................... 12
CONTROL COMPONENTS ................................................................. 13
BOILER INSTALLATION CONSIDERATIONS ..................................... 15
Hydronic System ............................................................................. 15
Hot water boiler system - general water line connections ............... 16
GENERAL REQUIREMENTS .............................................................. 21
Location ........................................................................................... 21
Fresh air openings for conned spaces ........................................... 23
VENTING .............................................................................................. 25
Vent Installation Considerations ...................................................... 25
Venting Supports ............................................................................. 27
CONDENSATE DISPOSAL .................................................................. 37
GAS SUPPLY CONNECTIONS ........................................................... 38
BOILER START UP AND OPERATIONS ............................................. 40
LIGHTING AND OPERATING INSTRUCTIONS .................................. 42
CONTROL SYSTEM ............................................................................ 45
Burner Control System .................................................................... 45
Burner control operation .................................................................. 46
General operational sequence ........................................................ 47
Local operator interface: display system ......................................... 49
Installation instructions (S7999B OI Display) .................................. 50
Starting up the S7999B OI Display .................................................. 51
Page Navigation .............................................................................. 51
TROUBLESHOOTING ......................................................................... 61
MAINTENANCE PROCEDURES ......................................................... 76
Maintenance schedules ................................................................... 76
General maintenance ...................................................................... 76
Burner maintenance ........................................................................ 77
Venting maintenance ....................................................................... 78
Heat exchanger maintenance .......................................................... 78
Handling ceramic ber materials ..................................................... 79
Replacement parts .......................................................................... 79
PIPING DIAGRAMS ............................................................................. 80
LIMITED WARRANTY .......................................................................... 82
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SAFE INSTALLATION, USE AND SERVICE
The proper installation, use and servicing of this boiler is extremely important to your safety and the safety of others.
Many safety-related messages and instructions have been provided in this manual and on your boiler to warn you and others of a
potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very important that the
meaning of each safety message is understood by you and others who install, use, or service this boiler.
This is the safety alert symbol. It is used to alert you to
potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible
injury or death.
DANGER indicates an imminently
DANGER
WARNING
CAUTION
hazardous situation which, if not avoided,
will result in injury or death.
WARNING indicates a potentially hazardous
situation which, if not avoided, could result
in injury or death.
CAUTION indicates a potentially hazardous
situation which, if not avoided, could result in
minor or moderate injury.
CAUTION used without the safety alert
CAUTION
All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message, and
how to avoid the risk of injury.
The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to publish a list of substances
known to the State of California to cause cancer, birth defects, or other reproductive harm, and requires businesses to warn of
potential exposure to such substances.
This product contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm. This
boiler can cause low level exposure to some of the substances listed in the Act.
symbol indicates a potentially hazardous
situation which, if not avoided, could result in
property damage.
IMPORTANT DEFINITIONS
Gas Supplier: The Natural Gas or Propane Utility or service who supplies gas for utilization by the gas burning
appliances within this application. The gas supplier typically has responsibility for the inspection and code approval of
gas piping up to and including the Natural Gas meter or Propane storage tank of a building. Many gas suppliers also
offer service and inspection of appliances within the building.
APPROVALS
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GENERAL SAFETY
GROUNDING INSTRUCTIONS
This boiler must be grounded in accordance with the National
Electrical Code, Canadian Electrical Code and/or local codes.
Boiler is polarity sensitive; correct wiring is imperative for proper
operation.
This boiler must be connected to a grounded metal, permanent
wiring system, or an equipment grounding conductor must be
run with the circuit conductors and connected to the equipment
grounding terminal or lead on the boiler.
INLET WATER CONSIDERATIONS
Circulating water through the boiler and to the remote storage
tank (if applica ble) is accomplished by a pump on XW models
only. For hot water heating systems using the XB model, the
circulating pump is NOT provided on standard models (optional)
and must be eld installed.
CORRECT GAS
Make sure the gas on which the boiler will operate is the same as
that speci ed on the boiler rating plate. Do not install the boiler if
equipped for a different type of gas; con sult your supplier.
PRECAUTIONS
If the unit is exposed to the following, do not operate until all
corrective steps have been made by a qualied service agent:
1. Exposure to re.
2. If damaged.
3. Firing without water.
4. Sooting.
If the boiler has been exposed to ooding, it must be replaced.
LIQUEFIED PETROLEUM GAS MODELS
HIGH ALTITUDE INSTALLATIONS
Rated inputs are suitable up to 2000 feet (610 m) elevation. Consult
the factory for installation at altitudes over 2000 feet (610 m).
FIELD INSTALLED COMPONENTS
When installing the boiler, the follow ing compo nents must be
installed:
• Circulating Pump (Hyd ronic)
• Remote Temperature Sensor/Header Sensor
• Storage Tank (Temperature & Pressure Relief Valve)
Boilers for propane or liqueed petroleum gas (LPG) are different
from natural gas models. A natural gas boiler will not function safely
on LP gas and no attempt should be made to convert a boiler from
natural gas to LP gas.
LP gas must be used with great caution. It is highly explosive
and heavier than air. It collects rst in the low areas making its
odor difcult to detect at nose level. If LP gas is present or even
suspected, do not attempt to nd the cause yourself. Leave
the building, leaving doors open to ventilate, then call your gas
supplier or service agent. Keep area clear until a service call
has been made.
At times you may not be able to smell an LP gas leak. One
cause is odor fade, which is a loss of the chemical odorant that
gives LP gas its distinctive smell. Another cause can be your
physical condition, such as having a cold or diminishing sense
of smell with age. For these reasons, the use of a propane gas
detector is recommended.
If you experience an out of gas situation, do not try to relight
appliances yourself. Call your local service agent. Only trained
LP professionals should conduct the required safety checks in
accordance with industry standards.
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INTRODUCTION
This Instruction Manual covers XP Boiler models XB/XW 1000,
1300, 1700, 2000, 2600, 3400 - Series 100/101. The instructions
and illustrations contained in this Instruction manual will provide
you with troubleshooting procedures to diagnose and repair
common problems and verify proper operation.
MODEL IDENTIFICATION
Check the rating plate afxed to the Boiler. The following
information describes the model number structure:
SERIES-100/101 DESIGNATION:
• XP = Extreme Performance
MODEL (APPLICATION):
• XB = Hydronic Heating Boiler
• XW = Domestic Hot Water Supply Boiler
SIZE:
• 1000 = 920,000 Btu/hr input
• 1300 = 1,300,000 Btu/hr input
• 1700 = 1,700,000 Btu/hr input
• 2000 = 2,000,000 Btu/hr input
• 2600 = 2,600,000 Btu/hr input
• 3400 = 3,400,000 Btu/hr input
FUEL:
N = Natural gas
P = Propane
NOTE:
XB models are equipped with 50 psi pressure relief valve. (pump
is optionally installed)
XW models are factory installed circulating pump (standard),
with 125 psi pressure relief valve.
XB models can be special ordered with a factory installed pump
and XW models can be special ordered without the factory
installed pump. These factory congurations can also be
changed in the eld by installing circulation pumps and changing
pressure relief valves to accommodate domestic and hydronic
hot water system requirements.
Properly installed and maintained, it should give you years of
trouble free service.
ABBREVIATIONS USED
QUALIFICATIONS
QUALIFIED INSTALLER OR SERVICE AGENCY
Installation and service of this boiler requires ability equivalent
to that of a Qualied Agency, as dened by ANSI below. In the
eld involved. Installation skills such as plumbing, air supply,
venting, gas supply and electrical supply are required in addition
to electrical testing skills when performing service.
ANSI Z21.13 - CSA 4.9: “Qualied Agency” - “Any individual,
rm, corporation or company that either in person or through
a representative is engaged in and is responsible for (a) the
installation, testing or replacement of gas piping or (b) the
connection, installation, testing, repair or servicing of appliances
and equipment; that is experienced in such work; that is familiar
with all precautions required; and that has complied with all the
requirements of the authority having jurisdiction.”
If you are not qualied (as dened by ANSI above) and licensed
or certied as required by the authority having jurisdiction
to perform a given task do not attempt to perform any of the
procedures described in this manual. If you do not understand
the instructions given in this manual do not attempt to perform
any procedures outlined in this manual.
This product requires a formal Start-Up by an authorized service/
start-up provider that has been approved by the manufacturer for
this specic product. Call 1-800-527-1953 to locate the nearest
authorized start-up provider and arrange a factory start-up.
Please provide as much notice as possible, preferably 2 weeks.
Please have the model and serial number ready when you call.
This start-up is required to activate the warranty and ensure safe,
efcient operation.
Warranty on this product is limited and could be void in the event
the unit is not installed per the instructions in this manual and/or
not started up by an authorized factory trained service/start-up
provider.
Abbreviations found in this Instruction Manual include :
• ANSI - American National Standards Institute
• ASME - American Society of Mechanical Engineers
• NEC - National Electrical Code
• NFPA - National Fire Protection Association
• UL - Underwriters Laboratory
• CSA - Canadian Standards Association
• AHRI - Air-Conditioning, Heating and Refrigeration Institute
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DIMENSIONS AND CAPACITY DATA
FIGURE 1. SINGLE HEAT EXCHANGER BOILER
TABLE 1. ROUGH IN DIMENSIONS (SINGLE)
Models XB/XW-1000 XB/XW-1300 XB/XW-1700
Dimensions inches mm inches mm inches mm
Flue Outlet Diameter 6 152 8 152 8 203
Air Intake Diameter 6 152 6 152 8 203
Water Inlet 2 inch NPT 2 1/2 inch NPT
Water Outlet 2 inch NPT 2 1/2 inch NPT
Gas Inlet 2 inch NPT 2 inch NPT
A 47 1199 49 1245 57 1448
B 67 1702 68 1727 76 1930
C 29 737 29 737 29 737
D 37 940 38 965 37 940
E 23 584 23 584 24 610
F 9 229 9 229 9 229
G 34 864 34 864 34 864
H 44 111 8 45 1143 45 1143
J 6 152 6 152 6 152
K 11 279 11 279 11 279
L 12 305 11 279 12 305
TABLE 2. OPERATING CHARACTERISTICS
Models
(XB/XW)
1000, 1300, 1700
2000, 2600, 3400
Type of Gas Inches W.C. kPa Inches W.C. kPa Inches W.C. kPa
Natural
Propane
Manifold Pressure Maximum Supply Pressure Minimum Supply Pressure
Min Fire -0.2 to - 0.3 -0.05 to - 0.07
14.0 3.49 4.0 1.0
Max Fire -3.0 to -3.9 -0.75 to -0.97
Min Fire -0.1 to - 0.3 -0.025 to -0.07
14.0 3.49 4.0 2.0
Max Fire -3.6 to -4.9 -0.90 to -1.22
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FIGURE 2. DOUBLE HEAT EXCHANGER BOILER
TABLE 3. ROUGH IN DIMENSIONS (DOUBLE)
Models XB/XW-2000 XB/XW-2600 XB/XW-3400
Dimensions inches mm inches mm inches mm
Flue Outlet Diameter 8 203 8 203 10 254
Air Intake Diameter 8 203 8 203 10 254
Water Inlet 3 inch NPT 4 inch NPT
Water Outlet 3 inch NPT 4 inch NPT
Gas Inlet 2 inch NPT 3 inch NPT
A 47 1194 49 1245 57 1448
B 78 1981 80 2032 91 2311
C 36 914 37 940 37 940
D 22 559 22 559 22 559
E 40 1016 41 1041 41 1041
F 7 178 6 152 6 152
G 10 254 10 254 10 254
H 4 102 4 102 4 102
J 20 508 19 483 19 483
K 12 305 12 305 13 330
TABLE 4. RECOVERY CAPACITIES
Models
XW-1000 920,000 854,680
XW-1300 1,300,000 1,207,700
XW-1700 1,700,000 1,579,300
XW-2000 2,000,000 1,858,000
XW-2600 2,600,000 2,415,400
XW-3400 3,400,000 3,158,600
Input Rating
(Btu/hr)
Output Rating
(Btu/hr)
Temperature Rise - ΔT °F (°C)
Water
Flow
GPH 2,593 1,728 1,482 1,296 1,152 1,037 864 741
LPH 9,815 6,543 5,608 4,907 4,362 3,926 3,272 2,804
GPH 3,664 2,442 2,094 1,832 1,628 1,465 1,221 1,047
LPH 13,868 9,246 7,925 6,934 6,164 5,547 4,623 3,962
GPH 4,791 3,194 2,738 2,395 2,129 1,916 1,597 1,369
LPH 18,136 12,090 10,363 9,068 8,060 7,254 6,045 5,182
GPH 5,636 3,758 3,221 2,818 2,505 2,255 1,879 1,610
LPH 21,336 14,224 12,192 10,668 9,483 8,534 7,112 6,096
GPH 7,327 4,885 4,187 3,664 3,257 2,931 2,442 2,094
LPH 27,737 18,491 15,850 13,868 12,327 11,095 9,246 7,925
GPH 9,582 6,388 5,475 4,791 4,259 3,833 3,194 2,738
LPH 36,271 24,181 20,726 18,136 16,121 14,508 12,090 10,363
40
(22)
60
(33)
7
70
(39)
80
(44)
90
(50)
100
(56)
120
(67)
140
(78)
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RATINGS
TABLE 5. IBR RATINGS
MODELS
(XB/XW)
1000 920 100 856 744
1300 1300 130 1209 1051
1700 1700 170 1581 1375
2000 2000 100 1860 1617
2600 2600 130 2418 2103
3400 3400 212 3162 2750
Notes:
1. The ratings are based on standard test procedures prescribed by the United States Department of Energy.
2. Net I=B=R ratings are based on net installed radiation of sufcient quantity for the requirements of the building and nothing need
be added for normal piping and pickup. Ratings are based on a piping and pickup allowance of 1.15.
3. Ratings have been conrmed by the Hydronics Institute, Section of AHRI.
INPUT
MBH
MAX MIN
GROSS
OUTPUT MBH
(NOTE 1)
NET I=B=R RATINGS WATER MBH
(NOTE 2)
ELECTRICAL REQUIREMENTS
TABLE 6. ELECTRICAL REQUIREMENTS
MODELS
(XB/XW)
1000 120 60 30 A dedicated, single phase, 30/60 amp circuit breaker
1300 120 60 30
1700 120 60 30
2000 120 60 60 A dedicated, single phase, 60/60 amp circuit breaker
2600 120 60 60
3400 120 60 60
SUPPLY VOLTAGE
(VOLTS)
FREQUENCY
(HZ)
CURRENT
(AMPS)
ELECTRICAL NOTES
with a grounded neutral should be provided to supply
power to the boiler.
with a grounded neutral should be provided to supply
power to the boiler.
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FLOW, HEAD AND TEMPERATURE RISE
TABLE 7. XB MODELS - FLOW, HEAD AND TEMPERATURE RISE
Models
XB-1000 920,000 855,600
XB-1300 1,300,000 1,209,000
XB-1700 1,700,000 1,581,000
XB-2000 2,000,000 1,860,000
XB-2600 2,600,000 2,418,000
XB-3400 3,400,000 3,162,000
Input
(Btu/hr)
Output
(Btu/hr)
Temperature Rise - ΔT °F Flow Rate
Water
Flow
GPM 86 56 43 86 43
LPM 325 211 162 325 162
ΔP FT 26 12 7 26 7
ΔP M 7.9 3.7 2.1 7.9 2.1
GPM 120 80 60 120 60
LPM 453 302 226 453 226
ΔP FT 32.5 15 8 32.5 8
ΔP M 9.9 4.6 2.4 9.9 2.4
GPM 156 104 78 156 78
LPM 592 395 296 592 296
ΔP FT 35 14 8 35 8
ΔP M 10.7 4.3 2.4 10.7 2.4
GPM 184 123 92 184 92
LPM 696 464 348 696 348
ΔP FT 26 12 7 26 7
ΔP M 7.9 3.7 2.1 7.9 2.1
GPM 239 159 120 239 120
LPM 905 604 453 905 453
ΔP FT 32.5 15 8 32.5 8
ΔP M 9.9 4.6 2.4 9.9 2.4
GPM 313 209 156 313 156
LPM 1184 789 592 1184 592
ΔP FT 35 14 8 35 8
ΔP M 10.7 4.3 2.4 10.7 2.4
20 30 40 Maximum Minimum
Note: Head Loss shown is through the boiler only and allows for no additional piping.
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FEATURES AND COMPONENTS
FIGURE 3. SINGLE HEAT EXCHANGER BOILER COMPONENTS
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FIGURE 4. DOUBLE HEAT EXCHANGER BOILER COMPONENTS
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COMPONENT DESCRIPTION
1. Front access door:
Provides access to the gas train, burner controllers and the heat
exchanger.
2. Air Filter Box:
Allows for the connection of the PVC air intake pipe to the boiler
through a standard PVC adapter. It uses a lter to prevent dust
and debris from entering the boiler.
3. Automatic air vents:
Designed to remove trapped air from the heat exchanger coils.
4. Blowers:
The blowers pull in air and gas through the venturis. Air and gas
mix inside the venturi and are pushed into the burners, where
they burn inside the combustion chamber.
5. Boiler inlet temperature sensors
These sensors monitor system return water temperature.
6. Boiler outlet temperature sensors/High Limits
These sensors monitor boiler outlet water temperature. The boiler
modulates based on the Lead Lag Sensor connected to the tank.
7. Burners
Made with metal ber and stainless steel construction, the
burners use pre-mixed air and gas and provide a wide range of
ring rates.
8. Condensate Trap
Disposes the condensate produced from heat exchanger and
houses a switch that detects in case of blockage.
9. Control modules
The control modules respond to internal and external signals and
control the blowers, gas valves, and pumps to meet the heating
demand.
10. Touch Screen Display
Digital controls with touch screen technology and full color
display.
11. Sight glass
The quartz sight glass provides a view of the ame for inspection
purposes.
12. Flame sensors
Used by the control module to detect the presence of burner
ame.
13. Flap valves
Prevents recirculation of ue products when only one burner is
running.
14. Flue gas sensors (not visible)
These sensors monitor the ue gas exit temperature. The control
modules will modulate and shut down the boiler if the ue gas
temperature gets too hot. This protects the ue pipe from
overheating.
15. Flue pipe adapter (not visible)
Allows for the connection of the PVC vent pipe system to the
boiler.
16. Gas shutoff valves (Internal unit)
Manual valves used to isolate the gas valves from the burners.
17. Main gas shutoff valve (External unit)
Manual valve used to isolate the boiler from the gas supply.
18. Automatic modulating gas valve
The gas valve with the addition of venturi and blower are used for
modulating premix appliances.
19. Heat exchanger access covers
Allows access to the combustion side of the heat exchanger
coils.
20. High gas pressure switch
Switch provided to detect excessive supply gas pressure.
21. Spark Igniter
Provides direct spark for igniting the burners.
22. Boiler power supply terminals (not visible)
The main power to the boiler is supplied through the terminals
housed inside the high voltage junction box.
23. Low gas pressure switch
Switch provided to detect low gas supply pressure.
24. High voltage connection box
This box has terminals for connecting the main power supply
(120V) to the boiler and outputs power supply (120V) for the
pumps from the boiler control. This box has terminals for low
voltage devices such as condensate trap and ow switch.
25. Sensors/Communication Box
Connects sensors to tank sensor/header sensor and external
connections to building managements systems through MODBUS.
26. Low water cutoff board and sensor probe (LWCO)
Device used to ensure adequate water is supplied to the boiler.
In the event of inadequate water levels, LWCO will ensure boiler
shut down. LWCO board is connected to the electronic panel,
whereas the sensor probe is connected to the heat exchanger.
27. Main power supply switch
Turns 120 VAC ON/OFF to the boiler.
28. Pump relay
The pump relays are used tfor providing power to the XW Boiler
models.
29. Pressure relief valve
Protects the heat exchangers from an over pressure condition.
The relief valve will be set at particular PSI, depending on models.
30. Reset switch (optional) (not visible)
Reset switch for the low water cutoff.
31. Stainless steel heat exchangers
Allows system water to ow through specially designed coils.
32. Venturi
The venturi is a gas/air mixing unit that allows modulation of a
premix burner with constant gas/air ratio.
33. Water inlet
Water connection that return water from the system to the heat
exchangers.
34. Water outlets
A NPT water connection that supplies hot water to the system.
35. Enable/Disable Switch
This is an emergency boiler turn off switch which disconnects
the interlock voltage to the control board, hence turning off the
power supply to the gas valves. Do not use this switch for
turning off the boiler, this should be done from the touch
screen display, using the Operational Switch on the Lead
Lag screen.
36. Vent outlet
Provides an outlet for combustion gases to outdoor.
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CONTROL COMPONENTS
THE CONTROL SYSTEM
The R7910A1138 is a burner control system that provides heat
control, ame supervision, circulation pump control, fan control,
boiler control sequencing, and electric ignition function. It will
also provide status and error reporting.
FIGURE 5. BURNER CONTROL SYSTEM
SPARK IGNITER
The spark igniter is a device that ignites the main burner. When
power is supplied to the igniter electrode, an electric arc is
created between the electrode and the ground terminal which
ignites the main burner.
FIGURE 7. LOW/HIGH GAS PRESSURE SWITCH
GAS VALVE
The gas valve is a normally closed servo regulated gas valve.
The valve opens only when energized by the burner control and
closes when the power is removed. The burner control supplies
24 volts to the gas valve during operation.
FIGURE 6. SPARK IGNITER
LOW/HIGH GAS PRESSURE SWITCH
This XP boiler is equipped with a low gas pressure switch which
meets the CSD-1 code requirements.
The Low Gas Pressure Switch is normally open and remains
open unless the pressure falls below the preset pressure.
The High Gas Pressure Switch is normally closed and is used to
detect excessive gas pressure.
FIGURE 8. GAS VALVE
WATER FLOW SWITCH
The water ow switch activates when sufcient water ow has
been established. Switch will not close when water ow is not
present.
FIGURE 9. WATER FLOW SWITCH
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FLAME SENSOR
Each burner is equipped with a ame sensor to detect the
presence of the burner ames at high and low re conditions. If
no ame is sensed, the gas valve will close automatically. The
voltage sensed by the ame sensor will also be displayed on the
Burner Screen.
FIGURE 10. FLAME SENSOR
WATER TEMPERATURE LIMIT CONTROLS
The “XB/XW” models incorporate an outlet water sensor having
dual sensors, that are factory set at 210°F (99°C).
MAIN POWER SUPPLY SWITCH
The main power supply switch is a padlockable switch. This switch
pro vides 120V from the power supply to the boiler.
This switch needs to be turned off when servicing the boiler.
Note: The Enable/Disable Switch on the front of the boiler
does not interrupt electrical power to the boiler.
WATER TEMPERATURE SENSORS
FIGURE 12. WATER TEMPERATURE SENSORS
Temperature sensors are threaded immersion probes.
Temperature probes have embedded temperature sensors
(thermistors). The boiler’s control system monitors these sensors
to determine water temperature at various points in the system.
INLET AND OUTLET TEMPERATURE SENSORS
All models have two inlet and two outlet temperature sensors
for each heat exchanger, factory installed to monitor the water
temperature entering and leaving the boiler. The Inlet Probe is
a temperature sensor only and has two leads. The Outlet probe
also contains the manual reset high temperature limit switch
and has four leads. The control system displays the Inlet and
Outlet water temperatures sensed from these two sensors on the
default Temperatures screen.
REMOTE SENSORS
All models are supplied from the factory with a remote sensor.
The remote sensor is used to control system water temperature
for a single boiler in a domestic hot water storage tank or in the
return line from a primary/secondary hydronic heating system.
The boiler will modulate its ring rate in response to the
actual system temperature and load conditions. The control
system displays the temperature sensed from the remote sensor
as the “Lead Lag” temperature on the default Temperatures
screen.
FIGURE 11. MAIN POWER SUPPLY SWITCH
LOW WATER CUTOFF DEVICE (LWCO)
Low water cutoff device is normally a closed switch that opens
when water drops below a preset level. Each model is equipped
with a factory installed LWCO. LWCO board is connected to the
electronic panel, whereas the sensor probe is connected to the
heat exchanger.
FIGURE 13. LWCO BOARD AND PROBE
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BOILER INSTALLATION CONSIDERATIONS
GENERAL
If the system is to be lled with water for testing or other purposes
during cold weather and before actual operation, care must be taken
to prevent freezing of water in the system. Failure to do so may cause
the water in the system to freeze with resulting damage to the system.
Damage due to freezing is not covered by the warranty.
Figure 78 on Page 80 shows a typical primary, secondary piping
method. This is the preferred piping method for most stainless steel
boilers. Other piping methods, however, may provide good system
operation. A prime concern when designing heating systems is the
maintenance of proper ow through the unit during boiler operation.
The secondary pump should be sized per the recommended ow
rate of the boiler, see Dimension and Capacity Data section in this
manual.
Before locating the boiler:
1. Check for nearby connection to:
• System water piping
• Venting connections
• Gas supply piping
• Electrical power
2. Locate the boiler so that if water connections should leak,
water damage will not occur. When such locations cannot
be avoided, it is recommended that a suitable drain pan,
adequately drained, be installed under the appliance.
The pan must not restrict combustion air ow. Under no
circumstances is the manufacturer to be held responsible
for water damage in connection with this appliance, or any
of its components.
3. Check area around the boiler. Remove any combustible
materials, gasoline and other ammable liquids.
4. Make sure the gas control system components are protected
from dripping or spraying water or rain during operation or
service.
5. If a new boiler will replace an existing boiler, check for and
correct system problems, such as:
• System leaks causing oxygen corrosion or heat
exchanger cracks from hard water deposits.
• Lack of freeze protection in boiler water causing system
and boiler to freeze and leak.
HYDRONIC SYSTEM
The following is a brief description of the equipment required
for the installations noted in this manual. All installations must
comply with local code.
WATER SUPPLY LINE
These boilers can be used only in a forced circulation hot water
heating system. Since most forced circulation systems will be of
the closed type, install the water supply line as shown on piping
diagram.
Fast lling of large pipe, old radiator installations and pressure
purging of series loop systems (where high pressures are not
available) requires bypassing of the pressure reducing valve.
Gener ally, pressure purging is not possible with a well pump
system. High point air venting is essential.
If the system is of the open type, a pressure reducing valve will not
be required as the water supply to the system will be controlled by
a manu ally operated valve. An overhead surge tank is required. A
minimum pressure of 15 psi (100 kPa) must be maintained on the
boiler at all times to ensure avoidance of potential damage to the
boiler which may not be covered by the warranty.
EXPANSION TANK
If the system is of the closed type, install an expansion tank. The
sizing of the expansion tank for a closed system is very important and
is directly related to the total water volume of the system.
An air separator as shown in the piping diagrams is recommended
especially for modern commercial hydronic systems. See Figure 78
on Page 80.
VENT VALVES
It is recommended that automatic, loose key or screw-driver type
vent valves be installed at each convector or radiator.
SYSTEM HEADERS
Split systems with individual supply and return lines from the
boiler room should normally have this piping connected to
supply and return manifold headers near the boiler. To achieve
good water distribution with maximum pressure drop for sever al
circuits, manifolds should be larger than system mains.
The circuits should be spaced on the heater at a minimum of 3”
(76 mm) center to center. Install a balancing cock in each return
line.
Manifold headers are recommended for split systems with
or without zone valves and also those installations with zone
circulators. If the system is to be split at remote points, good
practice requires special attention be given to main pipe sizing to
allow balancing of water ow.
CHECK VALVES
Check valves must be installed to isolate each boiler in
installations where multiple boilers/pumps are installed in the
same zone.
COOLING PIPING
When the boiler is used in conjunction with a refrigeration system
it must be installed so that the chilled medium is piped in parallel
with the boiler. Appropriate ow control valves, manual or
motorized, must be provided to prevent the chilled medium from
entering the boiler.
If the boiler is connected to chilled water piping or its heating coils
are exposed to refrigerated air, the boiler piping system must be
equipped with ow valves or other automatic means to prevent
gravity circulation through the boiler during the cooling cycle.
Primary/secondary pumping of both the chiller(s) and the boiler(s) is
an excellent winter-summer change-over method, because cooling
ow rates are so much more than heating ow rates. In this way each
system (heating or cooling) is circulated independently.
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Page 16
CIRCULATING PUMP
A circulating pump is used when a system requires a circulating
loop or there is a storage tank used in conjunction with the boiler.
Install in accordance with the current edition of the National
Electrical Code, NFPA 70 or the Canadian Electrical Code,
CSA C22.1. All bronze circulating pumps are recommended
for use with commercial boilers. Some circulating pumps are
manufactured with sealed bearings and do not require further
lubrication. Some circulating pumps must be periodically oiled.
Refer to the pump manufacturer’s instructions for lubrication
requirements.
XB HYDRONIC BOILERS: The circulating pump is not provided
on standard models (optional) and must be obtained and installed
in the eld.
XW HOT WATER BOILERS: The circulating pump is integral to
the XW models. This pump has been lubricated at the factory,
and future lubrication should be in accordance with the motor
manufacturer’s instructions provided as a supplement to this
manual.
PRIMARY SYSTEM CONTROL
All XP boiler installations require a “Primary System Control” that
senses and reacts to water temperature inside the storage tank
on domestic water applications or in the return line on primary/
secondary hydronic heating systems. The Primary System
Control will activate and deactivate boiler heating cycles based
on its setpoint and current system water temperature. There are
three suitable methods to congure a Primary System Control.
One of these three methods must be used.
1. The Primary System Control can be the boiler’s
control system working with the factory supplied Header
Sensor, installed inside the storage tank on domestic water
applications or in the return line on primary/secondary
hydronic heating systems.
2. Alternatively, the Burner Control system can be used
as a Primary System Control. It will also provide boiler status
and error reporting. Multiple boilers can be joined together
to heat a system instead of a single, larger burner or boiler.
Using boilers in parallel is more efcient, costs less, reduces
emissions, improves load control, and is more exible than
the traditional large boiler.
3. MB2 and COM2 ports can be used for Building
Management Systems.
INTERNAL CONTAMINANTS
The hydronic system must be internally cleaned and ushed
after a new or replacement boiler has been installed, to remove
contaminants that may have accumulated during installation.
This is extremely important when a replacement boiler is installed
into an existing system where Stop Leak or other boiler additives
have been used.
Failure to clean and ush the system can produce acid
concentrations that become corrosive, and leads to heat
exchanger failure.
All hot water heating systems should be completely ushed with
a grease removing solution to assure trouble-free opera tion. Pipe
joint compounds, soldering paste, grease on tubing and pipe all
tend to contaminate a system
Failure to ush contaminants from a system can cause solids
to form on the inside of boiler exchangers, create excessive
blockage of water circulation, deterioration of the pump seals
and impellers.
HOT WATER BOILER SYSTEM - GENERAL WATER LINE CONNECTIONS
Piping diagrams will serve to provide the installer with a
reference for the materials and methods of piping necessary for
installation. It is essential that all water piping be installed and
connected as shown on the diagrams. Check the diagrams to
be used thoroughly before starting installation to avoid possible
errors and to minimize time and material cost. It is essential that
all water piping be installed and connected as shown on the
diagrams. See Figure 78 on Page 80 and Figure 79 on Page 81.
CLOSED WATER SYSTEMS
Water supply systems may, because of code requirements
or such conditions as high line pressure, among others, have
installed devices such as pressure reducing valves, check
valves, and back ow preventers. Devices such as these cause
the water system to be a closed system.
THERMAL EXPANSION
As water is heated, it expands (thermal expansion). In a closed
system the volume of water will increase when it is heated. As the
volume of water increases there will be a corresponding increase
in water pressure due to thermal expansion. Thermal expansion
can cause premature failure (leakage). This type of failure is not
covered under the limited warranty. Thermal expansion can also
cause intermittent Temperature-Pressure Relief Valve operation:
water discharged from the valve due to excessive pressure build
up. This condition is not covered under the limited warranty.
The Temperature-Pressure Relief Valve is not intended for the
constant relief of thermal expansion.
A properly sized thermal expansion tank must be installed on
all closed systems to control the harmful effects of thermal
expansion. Contact a local plumbing service agency to have a
thermal expansion tank installed.
PRESSURE RELIEF VALVE
An ASME rated pressure relief valve is furnished with the boiler.
A tting for the relief valve is provided in the top of the boiler.
Never operate the heating elements without being certain the
boiler is lled with water and a properly sized pressure relief
valve is installed in the relief valve opening provided.
The pressure rating of the relief valve should be equal to or less
than the rated pressure capacity of any component in the system
including the boiler. Should the valve need to be replaced, call
the toll free phone number listed on the back of this manual for
further technical assistance
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Page 17
CAUTION
•
Pressure Relief Valve discharge pipe must
terminate at adequate drain.
Water Damage Hazard
Explosion Hazard
Relief Valve must comply with
ASME code.
Properly sized Relief Valve must
be installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
A discharge pipe from the relief valve should terminate at an
adequate oor drain. Do not thread, plug, or cap the end of
drain line.
In addition, a CSA design-certied and ASME-rated tempera ture
and pressure (T&P) relief valve must be installed on each and
every water storage tank in hot water supply system. The T&P
relief valve must comply with appli cable construction provisions
of Standard for Relief Valves for Hot Water Supply Systems, ANSI
Z21.22 or CSA 4.4. T&P re lief valve must be of automatic reset
type and not embody a single-use type fusible plug, cartridge or
linkage.
T&P relief valve should have a temperature rating of 210°F
(99°C), a pressure rating not exceeding lowest rated working
pressure of any system compo nent, and a discharge capacity
exceeding total input of water boilers supply ing water to storage
tank.
Locate the T&P relief valve (a) in the top of the tank, or (b) in
the side of the tank on a centerline within the upper 6 inches
(152 mm) of the top of the tank, see Figure 78 and Figure 79.
The tapping should be threaded in accordance with the current
edition of the Standard for Pipe Threads, General Purpose
(inch), ANSI/A SME B1.20.1. The location of, or in tended location
for, the T&P relief valve should be readily accessible for servicing
or replacement.
GAS CONNECTIONS
The Discharge Pipe:
• Shall not be smaller in size than the outlet pipe size of the
valve, or have any reducing couplings or other restrictions.
• Shall not be plugged or blocked.
• Shall not be exposed to freezing temperatures.
• Shall be of material listed for hot water distribution.
• Shall be installed so as to allow complete drainage of both
the relief valve and the discharge pipe.
• Must terminate a maximum of six inches above a oor
drain or external to the building. In cold climates, it is
recommended that the discharge pipe be terminated at an
adequate drain inside the building.
• Shall not have any valve or other obstruction between the
relief valve and the drain.
Once the boiler is installed and lled with water and the system
is pressurized, manually test the operation of the pressure relief
valve. See the Maintenance Procedures section of this manual
for instructions.
Your local code authority may have other specic safety relief
valve requirements not covered below. If any pressure relief
valve is re placed, the replace ment valve must com ply with the
current version of the ASME Boiler and Pressure Vessel Code,
Section IV (“HEATING BOILERS”).
XB HYDRONIC BOILERS, are shipped with a 50 psi (345 kPa)
pressure relief valve. This relief valve must be in stalled in the
water outlet as near to the boiler as possi ble.
XW HOT WATER BOILERS, are shipped with a 125 psi (860
kPa) pressure relief valve that must be in stalled in the water outlet as near to the boil er as possi ble.
This ASME-rated valve has a discharge capacity that exceeds
maximum boiler input rating and a pres sure rating that does not
exceed maxi mum working pres sure shown on boiler rating plate.
Make sure the gas on which boiler is to operate is same as that
specied on the rating plate. Do not install boiler if equipped for a
different type of gas. Consult your gas supplier.
This boiler is not intended to operate at gas supply pressure
other than shown on the rating plate. A lock-up or positive shutoff type regulator must be installed in gas supply line. For proper
gas regulation the lock-up style regulators must be installed no
closer than a minimum of 3 feet from the boiler and a maximum
of 8 feet away from the boiler. Exposure to higher gas supply
pressure may cause damage to gas valves which can result in
re or explosion. If overpressure has occurred such as through
improper testing of gas lines or emergency malfunction of supply
system, the gas valves must be checked for safe operation.
Make sure that the outside vents on supply regulators and the
safety vent valves are protected against blockage. These are
parts of the gas supply system, not boiler. Vent blockage may
occur during ice build-up or snowstorms.
The boiler must be isolated from the gas supply piping system by
closing its main manual gas shut off valve during any pressure
testing of the gas supply piping system at test pressures equal
to or less than 1/2 psig.
Disconnect the boiler and its main manual gas shut-off valve
from the gas supply piping during any pressure testing of the
gas supply system over 1/2 psig. The gas supply line must be
capped when not connected to the boiler.
17
Page 18
It is important to guard against gas valve fouling from
contaminants in the gas ways. Such fouling may cause improper
operation, re or explosion. If copper supply lines are used they
must be approved for gas service.
When local codes require a main manual shut-off valve outside
the boiler jacket, a suitable main manual shut-off valve must be
installed in a location complying with those codes.
Before attaching gas line be sure that all gas pipe is clean
on inside. To trap any dirt or foreign material in the gas supply
line, a drip leg (or sediment trap) must be incorporated in piping.
The drip leg must be readily accessible and not subject to
freezing conditions. Install in accordance with recommendations
of serving gas supplier. Refer to the current edition of the National
Fuel Gas Code, ANSI Z223.1/NFPA 54 or the Natural Gas and
Propane Installation Code, CAN/CSA B149.1
Size of gas supply piping may be larger than heater connection
on installations where a signicant run of piping is required.
To prevent damage, care must be taken not to apply too much
torque when attaching gas supply pipe to boiler gas inlet. When
installing and tightening gas piping use a second wrench to hold
the gas valve to keep the valve from turning. To prevent damage
to the gas valve do not use pipe wrench on the valve body.
Fittings and unions in gas line must be of metal to metal type.
Apply joint compounds (pipe dope) sparingly and only to the
male threads of pipe joints. Do not apply compound to the rst
two threads. Use compounds resistant to the action of liqueed
petroleum gases. The boiler and its gas connection must be leak
tested before placing the boiler in operation.
GAS SUPPLY LINE SIZING
The gas piping installation must be capable of supplying the
maximum probable gas demand without excessive pressure loss.
Depending on local practices, the ALLOWABLE PRESSURE
LOSS between the gas meter, or service regulator and each
appliance is generally 0.3 or 0.5 inches of water column (0.075
or 0.124 kPa).
For single boiler installation, refer to Table 8 and Table 9 to size
iron pipe or equivalent gas supply line size to be used with single
unit.
For multiple boiler installation or installations of a single boiler
with other gas appliances, please refer to Table 10 and Table 11
on Page 20 to size iron pipe or equivalent gas supply line. These
tables are taken from the current edition of the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 or the Natural Gas and Propane
Installation Code, CAN/CSA B149.1.
• Table 10 is based on a pressure drop of 0.5 inches water
column (0.124 kPa), and a gas with a specic gravity of
0.60 and a heating value of 1,000 BTU/ft3, approximately
that of Natural Gas.
• Table 11 is based on a pressure drop of 0.5 inches water
column (0.124 kPa), and a gas with a specic gravity of
1.53 and a heating value of 2,500 BTU/ft3, approximately
that of Propane Gas.
Where it is necessary to use more than the average number of
ttings (i.e., elbows, tees and valves in gas supply line) use a
pipe larger than specied to compensate for increased pressure
drop.
Table 8 and Table 9 shows the maximum equivalent gas pipe
length for a single unit installation. It does not take into account
other appliances that may be connected to the gas line.
For installation of multiple units, or instances where several
appliances are connected to the same line, use Table 10 and
Table 11 for proper sizing.
SINGLE UNIT INSTALLATION, SUGGESTED GAS PIPE
TABLE 8.
SIZING. MAXIMUM EQUIVALENT PIPE LENGTH (IN FEET).
BTU
Input
920,000 70 150 175 ----- ----- ----- ----- -----
1,300,000 40 100 100 200 ----- ----- ----- -----
1,700,000 20 60 70 150 200 ----- ----- -----
2,000,000 20 50 50 100 150 ----- ----- -----
2,600,000 10 30 30 70 90 200 ----- -----
3,400,000 ----- ----- 20 40 50 125 200 -----
Natural gas 1000 Btu/ft^3, 0.60 specic gravity @ 0.3 in. w.c. pressure drop.
Propane gas 2500 Btu/ft^3, 1.50 specic gravity @ 0.3 in. w.c. pressure drop.
2” 2-1/2” 3” 4”
Nat Pro Nat Pro Nat Pro Nat Pro
TABLE 9.
SINGLE UNIT INSTALLATION, SUGGESTED GAS PIPE
SIZING. MAXIMUM EQUIVALENT PIPE LENGTH (IN FEET).
BTU
Input
920,000 125 200 200 ----- ----- ----- ----- -----
1,300,000 80 175 175 ----- ----- ----- ----- -----
1,700,000 40 100 100 ----- ----- ----- ----- -----
2,000,000 30 80 80 200 200 ----- ----- -----
2,600,000 20 50 50 125 150 ----- ----- -----
3,400,000 10 30 30 70 90 200 ----- -----
Natural gas 1000 Btu/ft^3, 0.63 specic gravity @ 0.5 in. w.c. pressure drop.
Propane gas 2500 Btu/ft^3, 1.50 specic gravity @ 0.5 in. w.c. pressure drop.
2” 2-1/2” 3” 4”
Nat Pro Nat Pro Nat Pro Nat Pro
CORROSIVE MATERIALS AND CONTAMINATION
SOURCES
Products to avoid:
• Spray cans containing chloro/uorocarbons
• Permanent wave solutions
• Chlorinated waxes/cleaners
• Chlorine-based swimming pool chemicals
• Calcium chloride used for thawing
• Sodium chloride used for water softening
• Refrigerant leaks
• Paint or varnish removers
• Hydrochloric acid/muriatic acid
• Cements and glues
• Antistatic fabric softeners used in clothes dryers
• Chlorine-type bleaches, detergents, and cleaning
solvents found in household laundry rooms
• Adhesives used to fasten building products and other
similar products
Areas likely to have contaminants:
• Dry cleaning/laundry areas and establishments
• Swimming pools
• Metal fabrication plants
• Beauty shops
• Refrigeration repair shops
• Photo processing plants
18
Page 19
• Auto body shops
• Plastic manufacturing plants
• Furniture renishing areas and establishments
• New building construction
• Remodeling areas
Common household products, pool and laundry products may
contain uorine or chlorine compounds. When these chemicals
come in contact with the boiler, they react and can form strong
acids. The acid can spoil the boiler wall, causing serious damage
and may result in ue gas spillage or boiler water leakage into
the building.
If the above mentioned contaminants and corrosive materials
chemicals are present near the location of the boiler, make sure
to remove the boiler permanently or relocate air inlet and vent
terminations to other areas.
FIELD WIRING
120 VAC POWER SUPPLY WIRING
A dedicated, single phase, 30-60 amp (refer to Table 6 on Page
8) circuit breaker with a grounded neutral should be provided to
supply power to the boilers. Use #10 AWG wire for the 120 VAC
power supply to the boiler. All 120 VAC power supply connections
must be made as shown in Figure 14. These connections
should be made at the rear of the unit where a wiring junction
box is provided. Field installed power supply wiring to the boiler
should be installed in conduit. This conduit and wiring should
be separate from any other conduit/wiring to guard against EMI
(electromagnetic interference).
POWER SUPPLY CHECK
To reduce the possibility of electrical interference with the boiler’s
control system the power supply voltage, polarity and ground must
be checked. Using an AC volt meter check the 120 VAC power
supply wiring from the breaker prior to making power supply
connections at the boiler. Conrm the power supply voltage &
polarity are correct and that an adequate ground connection is
present by performing the three voltage tests below. See Figure
14 for wiring references.
Conrm RMS voltage between:
• H and GND = 108 VAC minimum, 132 VAC maximum.
• N and H = 108 VAC minimum, 132 VAC maximum.
• N and GND = < 1 VAC maximum.
LOW VOLTAGE CONTROL WIRING
1. Header Terminals: In case of Hydronic Boilers, the header
terminals are connected to the hydronic loop header sensor.
Whereas in case of Hot water Boilers the header terminals
are connected to the tank sensor where the temperature can
be sensed. See Figure 15.
2. Outdoor Terminals: In case of Hydronic Boilers, they are
connected to the outdoor sensors. But in case of Hot water
Boilers, they are not connected. See Figure 15. The outdoor
sensors must be mounted with cable inlet facing down
as shown in Figure 16. The maximum length of the wire
connecting from the boiler to the outdoor sensor must be no
more than 50 feet.
3. MB2 and COM2 terminals are meant for building
management systems.
FIGURE 15. LOW VOLTAGE CONTROL WIRING
All low voltage control wiring connections must be made as
shown in Figure 14. These connections should be made at the
rear of the unit where a wiring junction box is provided. Field
installed wiring inside 1/2 inch conduit is installed between the
junction box on the back of the boiler and the temperature probe
and/or eld supplied external control being used. This conduit
and wiring should be separate from any other conduit/wiring to
guard against EMI (electromagnetic interference).
FIGURE 14. FIELD WIRING
FIGURE 16. OUTDOOR SENSOR
The outdoor sensor must be mounted in a shaded location, to
avoid direct sunlight. It must be atleast 3 feet away from any
exhaust, dryer, bathroom or other building vents. It must be
located on the north side of th building, above the expected snow
line where ice and debris cannot cover it.
19
Page 20
TABLE 10. SUGGESTED PIPE SIZE FOR MULTIPLE GAS APPLIANCES (NATURAL GAS)
Nominal Maximum Capacity of Pipe in BTU/hr and kW for Gas Pressures of 14 in. W.C. (0.5 psi) or Less and
Iron Pipe a Pressure Drop of 0.5 in. W.C. (based on 0.60 Specic Gravity Gas w/Heating Value of 1,000 BTU’s/Ft3)
Size Length of Pipe in Feet (Meters)
(Inches) 10 (3.05) 20 (6.1) 30 (9.14) 40 (12.19) 50 (15.24) 60 (18.29) 70 (21.34) 80 (24.38) 90 (27.43) 100 (30.48) 125 (38.1) 150 175 200
1 1/2 BTU/hr 2,100,000 1,460,000 1,180,000 990,000 900,000 810,000 750,000 690,000 650,000 620,000 550,000 500,000 460,000 —
kW 615 428 346 290 264 237 220 202 190 182 161 146 135 —
2 BTU/hr 3,950,000 2,750,000 2,200,000 1,900,000 1,680,000 1,520,000 1,400,000 1,300,000 1,220,000 1,150,000 1,020,000 950,000 850,000 800,000
kW 1,157 805 644 556 492 445 410 381 357 337 299 278 249 234
2 1/2 BTU/hr 6,300,000 4,350,000 3,520,000 3,000,000 2,650,000 2,400,000 2,250,000 2,050,000 1,950,000 1,850,000 1,650,000 1,500,000 1,370,000 1,280,000
kW 1,845 1,274 1,031 879 776 703 659 600 571 542 483 439 401 375
3 BTU/hr 11,000,000 7,700,000 6,250,000 5,300,000 4,750,000 4,300,000 3,900,000 3,700,000 3,450,000 3,250,000 2,950,000 2,650,000 2,450,000 2,280,000
kW 3,222 2,255 1,830 1,552 1,391 1,259 1,142 1,084 1,010 952 864 776 718 668
4 BTU/hr 23,000,000 15,800,000 12,800,000 10,900,000 9,700,000 8,800,000 8,100,000 7,500,000 7,200,000 6,700,000 6,000,000 5,500,000 5,000,000 4,600,000
kW 6,736 4,627 3,749 3,192 2,841 2,577 2,372 2,197 2,109 1,962 1,757 1,611 1,464 1,347
20
TABLE 11. SUGGESTED PIPE SIZE FOR MULTIPLE GAS APPLIANCES (PROPANE GAS)
Nominal Maximum Capacity of Pipe in BTU/hr and kW for Gas Pressures of 14 in. W.C. (0.5 psi) or Less and
Iron Pipe a Pressure Drop of 0.5 in. W.C. (based on 0.60 Specic Gravity Gas w/Heating Value of 1,000 BTU’s/Ft3)
Size Length of Pipe in Feet (Meters)
(Inches) 10 (3.05) 20 (6.1) 30 (9.14) 40 (12.19) 50 (15.24) 60 (18.29) 70 (21.34) 80 (24.38) 90 (27.43) 100 (30.48) 125 (38.1) 150 175 200
1 1/2 BTU/hr 3,276,000 2,277,600 1,840,800 1,544,400 1,404,000 1,263,600 1,170,000 1,076,400 1,014,000 967,200 858,000 780,000 717,600 670,800
kW 959 667 539 452 411 370 343 315 297 283 251 228 210 196
2 BTU/hr 6,162,000 4,290,000 3,432,000 2,964,000 2,620,800 2,371,200 2,184,000 2,028,000 1,903,200 1,794,000 1,591,200 1,482,000 1,326,000 1,248,000
kW 1,805 1,256 1,005 868 768 694 640 594 557 525 466 434 388 366
2 1/2 BTU/hr 9,828,000 6,786,000 5,491,200 4,680,000 4,134,000 3,744,000 3,510,000 3,198,000 3,042,000 2,886,000 2,574,000 2,340,000 2,137,200 1,999,800
kW 2,878 1,987 1,608 1,371 1,211 1,097 1,028 937 891 845 754 685 626 585
3 BTU/hr 17,160,000 12,012,000 9,750,000 8,268,000 7,410,000 6,708,000 6,084,000 5,772,000 5,382,000 5,070,000 4,602,000 4,134,000 3,822,000 3,556,800
kW 5,026 3,518 2,856 2,421 2,170 1,965 1,782 1,690 1,576 1,485 1,348 1,211 1,119 1,042
4 BTU/hr 35,880,000 24,648,000 19,968,000 17,004,000 15,132,000 13,728,000 12,636,000 11,700,000 11,232,000 10,452,000 9,360,000 8,580,000 7,800,000 7,176,000
kW 10,508 7,219 5,848 4,980 4,432 4,021 3,701 3,427 3,290 3,061 2,741 2,513 2,284 2,102
Page 21
GENERAL REQUIREMENTS
REQUIRED ABILITY
Installation or service of this boiler requires ability equivalent to
that of a licensed trades man in the eld involved. Plumbing, air
supply, venting, gas supply, and electrical work are re quired.
LOCATION
When installing the boiler, consideration must be given to proper
location. The location selected should provide ade quate air
supply and be as centralized with the piping system as possible.
REPLACING EXISTING COMMON VENTED BOILER
NOTE: This section does not describe a method for common
venting XP units. It describes what must be done when a unit
is removed from a common vent system. The XP units require
special vent systems and fans for common vent. Contact the
factory if you have questions about common venting XP units.
When an existing boiler is removed from a common venting
system, the common venting system is likely to be too large
for proper venting of the appliances remaining connected to it.
At the time of removal of an existing boiler, the following steps
should be followed with each appliance remaining connected to
the common venting system placed in operation, while the other
appliances remaining connected to the common venting system
are not in operation.
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion and deciencies which could
cause an unsafe condition.
3. In so far as it is practical, close all building doors and
windows and all doors between the space in which the
appliances remaining connected to the common venting
system are located and other spaces of the building. Turn
on clothes dryers and any appliance not connected to the
common venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, so they will operate
at maximum speed. Do not operate a summer exhaust fan.
Close replace dampers.
4. Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust thermostat so the appliance will
operate continuously.
5. Test for spillage at the draft hood relief opening after 5
minutes of main burner operation. Use the ame of a match
or candle, or smoke from a cigarette, cigar or pipe.
6. After it has been determined that each appliance remaining
connected to the common venting system properly vents
when tested as outlined above, return doors, windows,
exhaust fans, replace dampers and any other gas-burning
appliance to their previous condition of use.
7. Any improper operation of the common venting system
should be corrected so that the installation conforms with
the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/
or CSA B149.1, Installation Codes. When resizing any
portion of the common venting system, the common venting
system should be resized to approach the minimum size as
determined using the appropriate tables and guidelines in the
National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA
B149.1, Installation Codes.
This boiler is intended for Indoor Installation only, and should not
be installed where freezing temperatures or any moisture could
damage the external components of the boiler.
21
Page 22
PANELS AND COVERS
All panels and covers (e.g. control and junction box covers; front,
side and rear panels of boiler) must be in place after service and/
or before opera tion of boiler. This will ensure that all gas ignition
components will be protected from water.
The XP is a low-pressure boiler (Category IV) to be used as
either hot water supply (domestic/commercial water heating) or
hot water heating (hydronic) application. Category IV appli ances
are often termed “High Ef ciency” appliances.
CHEMICAL VAPOR CORROSION
Boiler corrosion and component failure can be caused by the
he a ting an d br eakd own of air b o r ne chemic a l vapors. Spr ay can
propellants, cleaning sol vents, refrigerator and air conditioning
refrig erants, swimming pool chemicals, calcium and sodium
chloride (water softener salt), waxes, and process chemicals
are typical compounds which are potentially corrosive. These
materials are corrosive at very low concentration levels with little
or no odor to reveal their presence.
Products of this sort should not be stored near boiler. Also, air
which is brought in contact with boiler should not contain any
of these chemicals. If necessary, uncontaminated air should be
obtained from remote or outside sources. Failure to observe this
requirement will void warranty.
LEVELING
Because this unit is a Category IV appliance it produces some
amounts of condensation. The unit has a condensation disposal
system that requires this unit to be level to properly drain. Each
unit should be checked to be certain that it is level prior to starting
the unit.
If the unit is not level, obtain and insert shims under the feet at
the frame base to correct this condition.
AIR REQUIREMENTS
Breathing Hazard - Carbon Monoxide Gas
Install appliance in accordance with
the Instruction Manual and NFPA 54 or
CAN/CSA-B149.1.
To avoid injury, combustion and ventilation
air must be taken from outdoors.
Do not place chemical vapor emitting
products near water heater.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
INSTALLATION CLEARANCES
This boiler is approved for installation in an alcove with minimum
clearances to combustibles.
TABLE 12. INSTALLATION CLEARANCES
RECOMMENDED
SERVICE
CLEARANCES
Front 30" (762 mm) 8" (203 mm)
Rear 36" (610 mm) 24" (610 mm)
Left 24 " (610 mm) 1" (25.4 mm)
Right 24 " (610 mm) 2" (51 mm)
Top 24" (610 mm) 6" (152 mm)
2” (51 mm) clearance is allowable from combustible construction
for hot water pipes.
Sufcient area should be provided at the front and rear of the
unit for prop er servicing. In a utility room installa tion, the door
opening should be wide enough to allow the boiler to enter or
to permit the replacement of another appli ance such as a boiler.
FLOORING AND FOUNDATION:
All models are approved for installation on combustible ooring,
but must never be installed on carpeting. Do not install the boiler
on carpeting even if foundation is used. Fire can result, causing
severe personal injury, death, or substantial property damage.
If ooding is possible, elevate the boiler sufciently to prevent
water from reaching the boiler.
CLEARANCES FROM
COMBUSTIBLE
MATERIALS
For safe operation an adequate supply of fresh uncontaminated
air for combustion and ventilation must be provided.
An insufcient supply of air can cause recirculation of combustion
products resulting in contamination that may be hazardous to
life. Such a condition often will result in a yellow, luminous burner
ame, causing sooting of the combustion chamber, burners and
ue tubes and creates a risk of asphyxiation.
Do not install the boiler in a conned space unless an adequate
supply of air for combustion and ventilation is brought in to that
space using the methods described in the Conned Space
section that follows.
Never obstruct the ow of ventilation air. If you have any doubts
or questions at all, call your gas supplier. Failure to provide the
proper amount of combustion air can result in a re or explosion
and cause property damage, serious bodily injury or death.
UNCONFINED SPACE
An unconned space is one whose volume is not less than 50
cubic feet per 1,000 Btu/hr (4.8 cubic meters per kW) of the
total input rating of all appliances installed in the space. Rooms
communicating directly with the space, in which the appliances
are installed, through openings not furnished with doors, are
considered a part of the unconned space.
Makeup air requirements for the operation of exhaust fans,
kitchen ventilation systems, clothes dryers and replaces shall
also be considered in determining the adequacy of a space to
provide combustion, ventilation and dilution air.
UNUSUALLY TIGHT CONSTRUCTION
In unconned spaces in buildings, inltration may be adequate
to provide air for combustion, ventilation and dilution of ue
gases. However, in buildings of unusually tight construction (for
example, weather stripping, heavily insulated, caulked, vapor
barrier, etc.) additional air must be provided using the methods
described in the Conned Space section that follows.
22
Page 23
CONFINED SPACE
A conned space is one whose volume is less than 50 cubic
feet per 1,000 Btu/hr (4.8 cubic meters per kW) of the total input
rating of all appliances installed in the space.
Openings must be installed to provide fresh air for combustion,
ventilation and dilution in conned spaces. The required size for
the openings is dependent on the method used to provide fresh
air to the conned space and the total Btu/hr input rating of all
appliances installed in the space.
DIRECT VENT APPLIANCES
Appliances installed in a direct vent conguration that derive all
air for combustion from the outdoor atmosphere through sealed
intake air piping are not factored in the total appliance input Btu/
hr calculations used to determine the size of openings providing
fresh air into conned spaces.
EXHAUST FANS
Where exhaust fans are installed, additional air shall be provided
to replace the exhausted air. When an exhaust fan is installed
in the same space with a water heater, sufcient openings to
provide fresh air must be provided that accommodate the
requirements for all appliances in the room and the exhaust fan.
Undersized openings will cause air to be drawn into the room
through the water heater’s vent system causing poor combustion.
Sooting, serious damage to the water heater and the risk of re
or explosion may result. It can also create a risk of asphyxiation.
LOUVERS AND GRILLES
The free areas of the fresh air openings in the instructions that
follow do not take in to account the presence of louvers, grilles or
screens in the openings.
The required size of openings for combustion, ventilation and
dilution air shall be based on the “net free area” of each opening.
Where the free area through a design of louver or grille or screen
is known, it shall be used in calculating the size of opening
required to provide the free area specied. Where the louver and
grille design and free area are not known, it shall be assumed
that wood louvers will have 25% free area and metal louvers and
grilles will have 75% free area. Non motorized louvers and grilles
shall be xed in the open position.
OUTDOOR AIR THROUGH TWO OPENINGS
FIGURE 17. OUTDOOR AIR THROUGH TWO OPENINGS
The conned space shall be provided with two permanent
openings, one commencing within 12 inches (300 mm) of the top
and one commencing within 12 inches (300 mm) of the bottom of
the enclosure. The openings shall communicate directly with the
outdoors. See Figure 17.
Each opening shall have a minimum free area of 1 square inch
per 4,000 Btu/hr (550 mm2 per kW) of the aggregate input rating
of all appliances installed in the enclosure. Each opening shall
not be less than 100 square inches (645 cm2).
OUTDOOR AIR THROUGH ONE OPENING
FRESH AIR OPENINGS FOR CONFINED SPACES
The following instructions shall be used to calculate the size,
number and placement of openings providing fresh air for
combustion, ventilation and dilution in conned spaces. The
illustrations shown in this section of the manual are a reference
for the openings that provide fresh air into conned spaces
only. Do not refer to these illustrations for the purpose of vent
installation. See Venting section on Page 25 for complete venting
installation instructions.
FIGURE 18. OUTDOOR AIR THROUGH ONE OPENING
Alternatively a single permanent opening, commencing within 12
inches (300 mm) of the top of the enclosure, shall be provided.
See Figure 18. The water heater shall have clearances of at
least 1 inch (25 mm) from the sides and back and 6 inches (150
mm) from the front of the appliance. The opening shall directly
communicate with the outdoors or shall communicate through a
vertical or horizontal duct to the outdoors or spaces that freely
communicate with the outdoors and shall have a minimum free
area of the following:
1. 1 square inch per 3000 Btu/hr (700 mm2 per kW) of the total
input rating of all appliances located in the enclosure, and
2. Not less than the sum of the areas of all vent connectors in
the space.
23
Page 24
OUTDOOR AIR THROUGH TWO HORIZONTAL DUCTS
FIGURE 19. OUTDOOR AIR THROUGH TWO HORIZONTAL
DUCTS
The conned space shall be provided with two permanent
horizontal ducts, one commencing within 12 inches (300 mm) of
the top and one commencing within 12 inches (300 mm) of the
bottom of the enclosure. The horizontal ducts shall communicate
directly with the outdoors. See Figure 19.
Each duct opening shall have a minimum free area of 1 square
inch per 2,000 Btu/hr (1100 mm2 per kW) of the aggregate input
rating of all appliances installed in the enclosure.
When ducts are used, they shall be of the same cross sectional
area as the free area of the openings to which they connect.
The minimum dimension of rectangular air ducts shall be not less
than 3 inches.
OUTDOOR AIR THROUGH TWO VERTICAL DUCTS
The illustrations shown in this section of the manual are a
reference for the openings that provide fresh air into conned
spaces only.
Do not refer to these illustrations for the purpose of vent
installation.
The conned space shall be provided with two permanent vertical
ducts, one commencing within 12 inches (300 mm) of the top and
one commencing within 12 inches (300 mm) of the bottom of the
enclosure. The vertical ducts shall communicate directly with the
outdoors. See Figure 20.
Each duct opening shall have a minimum free area of 1 square
inch per 4,000 Btu/hr (550 mm2 per kW) of the aggregate input
rating of all appliances installed in the enclosure.
When ducts are used, they shall be of the same cross sectional
area as the free area of the openings to which they connect.
The minimum dimension of rectangular air ducts shall be not less
than 3 inches.
AIR FROM OTHER INDOOR SPACES
FIGURE 21. AIR FROM OTHER INDOOR SPACES
The conned space shall be provided with two permanent
openings, one commencing within 12 inches (300 mm) of the top
and one commencing within 12 inches (300 mm) of the bottom of
the enclosure. See Figure 21.
Each opening shall communicate directly with an additional
room(s) of sufcient volume so that the combined volume of all
spaces meets the criteria for an Unconned Space.
Each opening shall have a minimum free area of 1 square inch
per 1,000 Btu/hr (1100 mm2 per kW) of the aggregate input rating
of all appliances installed in the enclosure. Each opening shall
not be less than 100 square inches (645 cm2).
FIGURE 20. OUTDOOR AIR THROUGH TWO VERTICAL
DUCTS
24
Page 25
VENTING
Vent sizing, installation and termination should be in accordance
with this installation manual. This boiler must be vented using
PVC/CPVC or Stainless Steel materials.
All electrical power and gas must be turned off prior to any
installation of the venting system.
VENT INSTALLATION CONSIDERATIONS
This boiler is a category IV appliance that can be vented using
room air for intake combustion air, or direct vented so that all
intake air for combustion comes from the outside through a
sealed pipe. When installing this appliance as direct vent, special
vent kits are required.
In cold climates any water vapor remaining in the ue gases will
condense into a cloud of vapor at the point where the vent system
exits the building. Special consideration is recommended, before
locating the vent termination near walkways, windows and
building entrances.
Direct venting into dead spaces such as alleys, atriums, and
inside corners can cause recirculation of ue gases. Recirculation
of ue gases will cause sooting, premature failure of the heat
exchanger, and icing of the combustion air intake during severe
cold weather. To prevent the recirculation of ue gases, maintain
as much distance as possible between the combustion air
intake and the exhaust vent terminal. Due to large volumes of
ue gases, multiple boiler applications also require additional
distance between the intake and the exhaust terminals.
This boiler can be vented with PVC/CPVC or an UL approved AL
29-4C Stainless Steel venting material which are explained in the
following pages.
PVC/CPVC INSTALLATION:
STAINLESS STEEL INSTALLATION:
Installations must comply with applicable national, state, and
local codes. Stainless steel vent systems must be listed as a UL1738 approved system for the United States and a ULC-S636
approved system for Canada.
Installation of the approved AL 29-4C stainless steel venting
material should adhere to the stainless steel vent manufacturer’s
installation instructions supplied with the vent system.
Refer to Table 14 and Table 15 on Page 36 for air intake and vent
pipe sizes.
AIR INTAKE/VENT CONNECTIONS
1. Air Intake Adapter: Provides an inlet for combustion air
directly to the unit from outdoors.
2. Vent Outlet: Provides an outlet for combustion gases to
outdoors.
VENTING SYSTEM
This boiler may be installed in six separate orientations
depending on the require ments of the building and
the appliance. The installer must decide which method is most
appro priate for each installation. These orientations are:
1. Vertical Termination - vertical vent termi na tion through
un-enclosed or en closed areas with roof penetration, see
Figure 25 on Page 28.
2. Through-the-Wall Termination (TWT) - hori zontal vent
termination directly through an outside wall, see Figure 26
on Page 28.
3. Horizontal Direct Vent - using TWT to exhaust ue
prod ucts and PVC piping to bring combus tion air to the boiler
from the outside. See Figure 27 on Page 29 and Figure 30
on Page 30.
4. Vertical Direct Vent - using a vertical vent termination to
exhaust ue products and PVC piping to bring combustion
air to the boiler from outside, see Figure 28 on Page 29 and
Figure 29 on Page 30.
GENERAL VENT INSTALLATION PROCEDURE
Prior to beginning the installation of the vent system,
deter mine and obtain all parts re quired for the installa tion.
Proper operation of the boiler and vent ing system is dependent upon use of all speci ed parts and installa tion tech niques;
both safety and proper perfor mance of the system may suffer if
in structions are not followed.
Installation must comply with local requirements and with the
National Fuel Gas Code, ANSI Z223.1 for U.S. installations or
CSA B149.1 for Canadian installations.
Refer to Table 13 on Page 36 for PVC/CPVC piping materials.
All PVC vent pipes must be glued, properly supported, and
the exhaust must be pitched a minimum of a 1/4 inch per foot
back to the boiler (to allow drainage of condensate).
This appliance requires a special venting system. Use only
the vent materials, primer, and cement specified in this
manual to make the vent connections. Failure to follow this
warning could result in fire, personal injury, or death.
Note: Make sure that for PVC venting installation, the
first 10 feet of vent must be CPVC or stainless steel and
the set point temperature of the boiler must not exceed
200 °F.
25
Page 26
AIR INLET PIPE MATERIALS
VENT AND AIR PIPE INSTALLATION
Make sure the air inlet pipe(s) are sealed. The acceptable air
inlet pipe materials are:
• PVC/CPVC
• AL 29-4C
An adapter is provided for transition between the air inlet
connection on the boiler and the plastic air inlet pipe.
Seal all joints and seams of the air inlet pipe using either
Aluminum Foil Duct Tape meeting UL Standard 723 or 181A-P or
a high quality UL Listed silicone sealant. Do not install seams of
vent pipe on the bottom of horizontal runs.
Secure all joints with a minimum of 3 sheet metal screws or pop
rivets. Apply Aluminum Foil Duct Tape or silicone sealant to all
screws or rivets installed in the vent pipe.
Make sure that the air inlet pipes are properly supported.
The PVC/ CPVC air inlet pipe must be cleaned and sealed with
the pipe manufacturer’s recommended solvents and standard
commercial pipe cement for the material used. The PVC, CPVC,
air inlet pipe should use a silicone sealant to ensure a proper seal
at the boiler connection and the air intake adapter connection.
Proper sealing of the air inlet pipe ensures that combustion air
will be free of contaminants and supplied in proper volume.
1. Measure from the boiler level to vent. Refer to the Table 14
on Page 36 for the allowable lengths.
2. Prepare pipes to the required lengths and deburr the inside
and outside of the pipe ends. Chamfer outside the pipe end
to ensure even cement distribution when joining.
3. Clean all pipe ends and ttings using a clean dry rag.
(Moisture will retard curing and dirt or grease will prevent
adhesion.)
4. Dry t vent or air piping to ensure proper t before assembling
any joint. The pipe should go a third to two-thirds into the
tting to ensure proper sealing after cement is applied.
5. Priming and Cementing:
• Handle pipes and ttings carefully to prevent
contamination of surfaces.
• Apply an even coat of primer to the tting socket.
• Apply an even coat of primer to the pipe end to
approximately 1/2" beyond the socket depth.
• Apply a second primer coat to the tting socket.
• While primer is still wet, apply an even coat of approved
cement to the pipe equal to the depth of the tting
socket.
• While primer is still wet, apply an even coat of approved
cement to the tting socket.
• Apply a second coat of cement to the pipe.
• While the cement is still wet, insert the pipe into the
tting, if possible twist the pipe a 1/4 turn as you insert it.
Note: If voids are present, sufcient cement was not applied and
joint could be defective.
• Clear excess cement from the joint removing ring or
beads as it will needlessly soften the pipe.
When a sidewall or vertical rooftop combustion air supply system
is disconnected for any reason, the air inlet pipe must be resealed
to ensure that combustion air will be free of contaminants and
supplied in proper volume.
Failure to properly seal all joints and seams may result in ue
gas recirculation, spillage of ue products and carbon monoxide
emissions causing severe personal injury or death.
FIGURE 22. PVC/CPVC VENTING WITH ADAPTER
REQUIREMENTS FOR INSTALLATION IN CANADA
1. Installations must be made with a vent pipe system certied
to ULC-S636. IPEX is an approved vent manufacturer in
Canada supplying vent material listed to ULC-S636.
2. The initial 3 feet of plastic vent pipe from the appliance ue
outlet must be readily accessible for visual inspection.
3. The components of the certied vent system must not be
interchanged with other vent systems or unlisted pipe/
ttings.
FIGURE 23. PVC/CPVC VENTING - HORIZONTAL
26
Page 27
FIGURE 24. PVC/CPVC VENTING - VERTICAL
VENTING SUPPORTS
Care must be taken in the installation of the venting system
that adequate support is maintained throughout the installation
process. When extending more than 10 feet (3.0 m) vertically,
vertical support kits are required once every 10 feet (3.0 m) of
vertical run. Vertical support is also re quired immedi ately after
any transi tion (elbow, tee, etc.) to vertical of over 10 feet (3.0 m)
of run and after any offset in the vertical run.
The support brackets (supplied in the Vertical Support Kit)
are to be secure ly fastened to a solid vertical member of the
building using the appropriate fasteners; i.e., wood screws for
wood framing, machine or tapping screws for structural steel
or masonry anchors for solid masonry. The bracket should be
located so that it will not interfere with any joints of the venting
system. The bottom most support bracket should be located
directly above the rst transition from horizontal to vertical.
If a means of support for the brackets is not available and
horizontal vent sections are present, install hanger straps
(made from non-combustible material) as close to the points of
transition as possible. If the horizontal portions of the vent and/or
vent connector are longer than 6 feet (2.0 m), then install hanger
straps every 6 feet (2.0 m) to support the connector.
Do not rivet or screw the straps to the conduit or other wise
puncture the conduit wall. Instead, wrap an extra loop of strap
around the conduit to hold it in position, or attach the strap to
the center screw of the double wall AL 29-4C® vent coupling,
if applica ble.
VERTICAL INSTALLATION REQUIREMENTS
1. The vent system must terminate at least 3 feet (1.0 m) and
no more than 6 feet (2.0 m) above the roof line and no closer
than 10 feet (3.0 m) from any wall or verti cal structure. If the
exhaust vent terminal is within 10 feet (3.0 m) of a wall or
parapet, it must extend a minimum of 2 feet (610 mm) above
the wall or parapet, see Figure 25 on Page 28 and Figure
28 on Page 29.
2. For direct vent installations, the total distance of the vent
system from the boiler vent connector to the vertical
vent termination should not exceed 100 equivalent feet
(30.5 m). A maximum of three 90° elbows can be used.
Minimum vertical vent is 7 equivalent feet (2.1 m) for
direct vent installations. Standard minimum vertical vent
length is 7 feet (2.1 m). See Figure 25, Figure 28 thru
Figure 30 for differences between standard and direct
vent installations.
3. An AL 29-4C® Vent Vertical Vent Terminal must be used at
the termina tion.
4. Maintain a minimum of 6 feet (2.0 m) separation between
the air intake and the exhaust terminals.
HORIZONTAL INSTALLATION REQUIREMENTS
1. The vent system must terminate with the Through-the-Wall
Termination (TWT) kits. Do not locate the terminal within 8 feet
(2.5 m) of an inside corner of a building or adjacent to outside
walls, shrubs or other such objects that may cause adverse
wind conditions in the immediate area.
2. The TWT should be located not less than 12 inches (305
mm) above grade or, in geographical areas where snow
accumulates, no less than 12 inches (305 mm) above anticipated snow line. Ensure that TWT is protected against blockage
which may occur during ice build up or snowstorms. The TWT
should terminate at least 3 feet (1.0 m) above any forced air
inlet within 10 feet (3.0 m), except when the forced air inlet
is the combustion air intake of a direct vent appliance. The
TWT should terminate at least 4 feet (1.2 m) below, 4 feet
(1.2 m) horizontally from or 1 foot (305 mm) above any door,
window or gravity air inlet into any building as provided in the
current edition of the nation al fuel gas code ANSI Z223.1.
In addition, a minimum clearance of 4 feet (1.2 m) horizontally
from, and in no case above or below, unless the 4 feet (1.2
m) of horizontal distance is main tained from electric meters,
gas meters, regulators and relief equip ment.
3. This horizontal exhaust vent system must pitch upward toward
the termination at 1/4 inch per foot (21 mm per meter).
4. The TWT is designed such that the building is protected from
degradation by ue gas and condensate. Howev er, if additional
protection is desired, install against the wall a non-corrosive
metal sheet under the TWT.
5. Due to the normal formation of water vapor in the combustion
process, horizon tal terminations must not be located over
areas of pedestrian or vehicular trafc, (i.e., public walkways
or over areas where condensate could create a nuisance or
hazard). This is especially true in colder climates where ice
buildup is likely to occur. A.O. Smith Corporation will not be
held liable for any personal injury or property damage due to
any dislodg ing of ice.
DIRECT VENT INSTALLATION REQUIREMENTS
The labels in the Direct Vent Kit must be afxed to the boiler in
locations specied by the instruction sheet provided in the kit.
The following are requirements for the Air-Intake Terminal (AIT):
1. The Air-Intake System (AIS) must ter minate with the venting
equipment pro vided with the boiler.
2. The AIT should not be located less than 3 feet (1.0 m) below
any exhaust vent within 10 feet (3.0 m).
3. The total horizontal distance of the AIS from the boiler’s
Blower Adapter to the outside of the “AIT” should not be
greater than 100 equivalent feet (30.5 m) of vent pipe nor
less than 3 feet (1.0 m), excluding elbows. A maximum of 3
elbows, equiva lent to 10 feet (3.0 m) each of pipe may be
used.
27
Page 28
MODELS
(XB/XW)
1000 320884-000
1300 320884-001
1700 320884-001
2000 320884-001
2600 320884-001
3400 320884-002
VENT KIT NUMBERS
(RAIN CAP)
FIGURE 25. VERTICAL VENTING
MODELS
(XB/XW)
1000 321765-000
1300 321765-001
1700 321765-001
2000 321765-001
2600 321765-001
3400 321765-002
VENT KIT NUMBERS
(TEE)
FIGURE 26. HORIZONTAL VENTING
28
Page 29
MODELS
(XB/XW)
1000 321765-000 321764-000
1300 321765-001 321764-000
1700 321765-001 321764-001
2000 321765-001 321764-001
2600 321765-001 321764-001
3400 321765-002 321764-002
VENT
KIT NUMBERS
(TEE)
AIR INTAKE
KIT NUMBERS
(ELBOW)
FIGURE 27. DIRECT VENT HORIZONTAL
MODELS
(XB/XW)
1000 320884-000 321764-000
1300 320884-001 321764-000
1700 320884-001 321764-001
2000 320884-001 321764-001
2600 320884-001 321764-001
3400 320884-002 321764-002
VENT
KIT NUMBERS
(RAIN CAP)
AIR INTAKE
KIT NUMBERS
(ELBOW)
FIGURE 28. DIRECT VENT VERTICAL
29
Page 30
MODELS
(XB/XW)
1000 320884-000 321764-000
1300 320884-001 321764-000
1700 320884-001 321764-001
2000 320884-001 321764-001
2600 320884-001 321764-001
3400 320884-002 321764-002
VENT
KIT NUMBERS
(RAIN CAP)
FIGURE 29. DIRECT VENT, VERTICAL VENT HORIZONTAL INTAKE
AIR INTAKE
KIT NUMBERS
(ELBOW)
MODELS
(XB/XW)
1000 321765-000 321764-000
1300 321765-001 321764-000
1700 321765-001 321764-001
2000 321765-001 321764-001
2600 321765-001 321764-001
3400 321765-002 321764-002
VENT
KIT NUMBERS
(TEE)
FIGURE 30. DIRECT VENT, HORIZONTAL VENT VERTICAL INTAKE
AIR INTAKE
KIT NUMBERS
(ELBOW)
30
Page 31
TERMINATION CLEARANCES SIDEWALL POWER VENT
POWER VENT
EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION
D
E
v
(using room air for combustion)
G
V
A
H
L
B
v
C
FIX ED
V
CLOSED
OPERABLE
V
F
B
OPERABLE
V
B
B
B
V
FIX ED
CLOSED
X
V
J
A
M
X
V
K
B
VENT TERMINAL AIR SUPPLY INLETAREA WHERE TERMINAL IS NOT PERMITTED
V X
FIGURE 31. POWER VENT
Vent terminal clearances for “Power Vent” installations. Power Vent congurations use room air for combustion.
2
Clearance to each side
of center line extended
H
above meter/regulator
assembly
Clearance to service
regulator vent outlet
I
CANADIAN INSTALLATIONS 1US INSTALLATIONS
3 feet (91 cm) within a height 15 feet
(4.5 m) above the meter/
regulator assembly
3 feet (91 cm) 3 feet (91 cm)*
3 feet (91 cm) within a
height 15 feet (4.5 m)
above the meter/regulator
assembly*
Clearance above grade,
veranda, porch, deck or
A
balcony
Clearance to window
or door that may be
B
opened
CANADIAN INSTALLATIONS 1US INSTALLATIONS
12 inches (30 cm) 12 inches (30 cm)
6 inches (15 cm) for appliances up to
10,000 Btu/hr (3 kW), 12 inches (30
cm) for appliances between 10,000
Btu/hr (3 kW) and 100,000 Btu/hr (30
kW), 36 inches (91 cm) for appliances
above 100,000 Btu/hr (30 kW)
4 feet (1.2 m) below
or to side of opening;
1 foot (30 cm) above
opening
2
6 inches (15 cm) for appliances up
to 10,000 Btu/hr (3 kW), 12 inches
(30 cm) for appliances between
10,000 Btu/hr (3 kW) and 100,000
Btu/hr (30kW), 36 inches (91cm)
for appliances above 100,000 Btu/
hr (30 kW)
6 feet (1.83 m)
7 feet (2.13 m)†
12 inches (30 cm) ‡ 12 inches (30 cm) ‡
4 feet (1.2 m) below or to
side of opening; 1 foot
(30 cm) above opening.
3 feet (91 cm) above if
within
10 feet (3 m) horizontally
7 feet (2.13 m)
Clearance to
permanently closed
C
window
Vertical clearance to
ventilated soft located
above the terminal
within a horizontal
D
distance of 2 feet (61
cm) from the center line
of the terminal
Clearance to
E
unventilated soft
Clearance to outside
F
corner
Clearance to inside
G
corner
12 inches (30 cm)* 12 inches (30 cm)*
12 inches (30 cm)* 12 inches (30 cm)*
12 inches (30 cm)* 12 inches (30 cm)*
2 feet (60 cm)* 2 feet (60 cm)*
8 feet (2.44 m)* 8 feet (2.44 m)*
Clearance to a non
mechanical air supply
inlet into building or
J
combustion air inlet to
any other appliance
Clearance to a
mechanical air supply
K
inlet
Clearance above paved
sidewalk or paved
L
driveway located on
public property
Clearance under
veranda, porch, deck, or
M
balcony
1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the oor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.
31
Page 32
TERMINATION CLEARANCES SIDEWALL DIRECT VENT
(using outdoor air for combustion)
G
V
A
C
FIX ED
V
CLOSED
OPERABLE
V
F
B
V
B
B
B
OPERABLE
V
A
B
FIX ED
CLOSED
J
H
V
M
X
X
V
K
D
E
v
L
B
v
VENT TERMINAL AIR SUPPLY INLETAREA WHERE TERMINAL IS NOT PERMITTED
V X
EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION
FIGURE 32. DIRECT VENT
Vent terminal clearances for “Direct Vent” installations. Direct Vent congurations use outdoor air for combustion.
DIRECT VENT
CANADIAN INSTALLATIONS 1US INSTALLATIONS
2
CANADIAN INSTALLATIONS
1
US INSTALLATIONS
2
Clearance above grade,
veranda, porch, deck or
A
balcony
Clearance to window or
B
door that may be opened
Clearance to
permanently closed
C
window
Vertical clearance to
ventilated soft located
above the terminal within
D
a horizontal distance of
2 feet (61 cm) from the
center line of the terminal
Clearance to unventilated
E
soft
Clearance to outside
F
corner
Clearance to inside
G
corner
12 inches (30 cm) 12 inches (30 cm)
6 inches (15 cm)
6 inches (15 cm) for appliances
up to 10,000 Btu/hr (3 kW), 12
inches (30 cm) for appliances
between 10,000 Btu/hr (3 kW)
and 100,000 Btu/hr (30 kW), 36
inches (91 cm) for appliances
above 100,000 Btu/hr (30 kW)
6 inches (15 cm)* 6 inches (15 cm)*
12 inches (30 cm)* 12 inches (30 cm)*
12 inches (30 cm)* 12 inches (30 cm)*
2 feet (60 cm)* 2 feet (60 cm)*
8 feet (2.44 m)* 8 feet (2.44 m)*
for appliances up to
10,000 Btu/hr (3 kW),
9 inches (23 cm) for
appliances between
10,000 Btu/hr (3 kW)
and 50,000 Btu/hr (15
kW), 12 inches (30 cm)
for appliances above
50,000 Btu/hr (15 kW)
Clearance to each side
of center line extended
H
above meter/regulator
assembly
Clearance to service
I
regulator vent outlet
Clearance to a non
mechanical air supply
inlet into building or
J
combustion air inlet to
any other appliance
Clearance to a
mechanical air supply
K
inlet
Clearance above
paved sidewalk or
L
paved driveway located
on public property
Clearance under
veranda, porch, deck,
M
or balcony
3 feet (91 cm) within a height 15
feet (4.5 m) above the meter/
regulator assembly
3 feet (91 cm) 3 feet (91 cm)*
6 inches (15 cm) for appliances up
to 10,000 Btu/hr (3 kW), 12 inches
(30 cm) for appliances between
10,000 Btu/hr (3 kW) and 100,000
Btu/hr (30 kW), 36 inches (91 cm)
for appliances above 100,000 Btu/
hr (30 kW)
6 feet (1.83 m)
7 feet (2.13 m)† 7 feet (2.13 m)†*
12 inches (30 cm) ‡ 12 inches (30 cm) ‡*
3 feet (91 cm) within a height
15 feet (4.5 m) above the
meter/regulator assembly*
6 inches (15 cm) for
appliances up to 10,000
Btu/hr (3 kW), 9 inches (23
cm) for appliances between
10,000 Btu/hr (3 kW) and
50,000 Btu/hr (15 kW), 12
inches (30 cm) for appliances
above 50,000 Btu/hr (15 kW)
3 feet (91 cm) above if within
10 feet (3 m) horizontally
1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the oor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.
32
Page 33
INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS
For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters installed
in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by
the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above nished grade in the
area of the venting, including but not limited to decks and porches, the following requirements should be satised:
INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side wall horizontal vented gas fueled
equipment, the installing plumber or gastter should observe that a hard wired carbon monoxide detector with an alarm and battery
back-up is installed on the oor level where the gas equipment is to be installed. In addition, the installing plumber or gastter should
observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling,
building or structure served by the sidewall horizontal vented gas fueled equipment. It should be the responsibility of the property owner
to secure the services of qualied licensed professionals for the installation of hard wired carbon monoxide detectors.
In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard wired
carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent oor level.
In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner should
have a period of thirty (30) days to comply with the above requirements provided that during said thirty (30) day period, a battery
operated carbon monoxide detector with an alarm should be installed.
APPROVED CARBON MONOXIDE DETECTORS Each carbon monoxide detector as required in accordance with the above
provisions should comply with NFPA 720 and be ANSI/UL 2034 listed and CSA certied.
SIGNAGE A metal or plastic identication plate should be permanently mounted to the exterior of the building at a minimum
height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating
appliance or equipment. The sign should read, in print size no less than one-half (1/2) inch in size, “GAS VENT DIRECTLY
BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.”
INSPECTION The state or local gas inspector of the side wall horizontally vented gas fueled equipment should not approve
the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance
with the provisions of 248 CMR 5.08(2)(a) 1 through 4.
EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:
1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current edition of NFPA 54
as adopted by the Board; and
2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from the
dwelling, building, or structure used in whole or in part for residential purposes.
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED When the manufacturer of Product
Approved side wall horizontally vented gas equipment provides a venting system design or venting system components with the equipment,
the instructions provided by the manufacturer for installation of the equipment and the venting system should include:
1. Detailed instructions for the installation of the venting system design or the venting system components; and
2. A complete parts list for the venting system design or venting system.
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED When the manufacturer
of a Product Approved side wall horizontally vented gas fueled equipment does not provide the parts for venting the ue
gases, but identies “special venting systems,” the following requirements should be satised by the manufacturer:
1. The referenced “special venting system” instructions should be included with the appliance or equipment installation instructions; and
2. The “special venting systems” should be Product Approved by the Board, and the instructions for that system should include
a parts list and detailed installation instructions.
A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment, all venting
instructions, all parts lists for venting instructions, and/or all venting design instructions should remain with the appliance or
equipment at the completion of the installation.
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Page 34
DIRECT VENT: HORIZONTAL TERMINATION
Gas vent extending through an exterior wall must not terminate
adjacent to a wall or below building extensions such as eaves,
parapets, balconies, or decks. Failure to comply could result in
severe personal injury, death, or substantial property damage.
Installation must comply with local requirements and with the
National Fuel Gas Code, ANSI Z223.1 for U.S. installations or
CSA B149.1 for Canadian installations.
VENT/AIR TERMINATION LOCATIONS:
Follow these guidelines for locating the vent/air terminations:
1. Make sure the total length of piping for vent or air do not
exceed the limits mentioned in Table 14 and Table 15 on
Page 36.
2. Consider the surroundings when terminating the vent and
air:
• While positioning the vent termination, ensure vapors
will not damage nearby shrubs, plants or air conditioning
equipment.
• The ue products will form a noticeable plume as they
condense in cold air. Avoid areas where the plume could
obstruct window views.
• Prevailing winds could cause freezing of condensate
and water/ice buildup where ue products impinge on
building surfaces or plants.
• Do not allow accidental contact of ue products with
people or pets.
• Do not locate the terminations near building corners,
near adjacent buildings or surfaces, window wells,
stairwells, alcoves, courtyards, or other recessed areas,
where wind eddies could affect performance or cause
recirculation .
• Sidewall vent and air inlet terminations must terminate in
the same pressure zone.
• Do not terminate above any door or window, where
condensate can freeze, causing ice formations.
• Locate or monitor the vent to prevent condensate
damage to exterior nishes.
3. The air piping must terminate in a down-turned elbow, using
a mesh screen. This setup will avoid recirculation of ue
products into the combustion air stream. See Figure 33.
4. The vent piping must terminate with a Tee pointed upwards
and away from the air inlet. See Figure 33.
5. Maintain clearances as shown in Figure 33 and Figure 34.
Vent must terminate:
• At least 6 feet (1.8 m) from adjacent walls.
• No closer than 12 inches (305 mm) below roof overhang.
• At least 7 feet (2.1 m) above any public walkway.
• At least 3 feet (0.9 m) above any forced air intake within
10 feet (3 m).
• No closer than 12 inches (305 mm) below or horizontally
from any door or window or any other gravity air inlet.
Air inlet must terminate at least 12 inches (305 m) above grade or
snow line; at least 12 inches (305 mm) below the vent termination;
and the vent pipe must not extend more than 24 inches (610 mm)
vertically outside the building as shown in Figure 33 and Figure
34.
Do not terminate closer than 4 feet (1.2 m) horizontally from
any electric meter, gas meter, regulator, relief valve, or other
equipment. Never terminate above or below any of these within
4 feet (1.2 m) horizontally.
6. Locate terminations so they are not likely to be damaged by
foreign objects, such as stones or balls, or subject to buildup
of leaves or sediment.
FIGURE 33. AIR/VENT TERMINATION - HORIZONTAL
FIGURE 34. HORIZONTAL CLEARANCES - AIR/VENT
TERMINATION
34
Page 35
DIRECT VENTING: VERTICAL TERMINATION
Installation must comply with local requirements and with the
National Fuel Gas Code, ANSI Z223.1 for U.S. installations or
CSA B149.1 for Canadian installations.
VENT/AIR TERMINATION LOCATIONS:
Follow these guidelines for locating the vent/air terminations:
1. Make sure the total length of piping for vent or air do not
exceed the limits mentioned in Table 14 and Table 15 on
Page 36.
2. The vent must terminate at least 3 feet above the highest
place in which the vent penetrates the roof and at least 2
feet above any part of a building within 10 feet horizontal.
3. The air piping must terminate in a down-turned 180° elbow,
using a mesh screen, no further than 2 feet (0.6 m) from the
center of the vent pipe. This placement avoids recirculation
of ue products into the combustion air stream.
4. The vent piping must terminate in an up-turned rain cap as
shown in Figure 35. When the vent termination uses a rain
cap as illustrated in Figure 35, maintain at least 36" (914
mm) above the air inlet. The air inlet pipe and vent pipe
can be located in any desired position on the roof, but must
always be no further than 2 feet (0.6 m) apart and with the
vent termination at least 1 foot above the air intake.
5. Locate terminations so they are not likely to be damaged by
foreign objects, such as stones or balls, or subject to buildup
of leaves or sediment and also not blocked or restricted by
snow accumulation.
6. If installing both intake air and vent piping in a Direct Vent
conguration vertically through the roof; ensure that all
exterior vertical clearance requirements shown in Figure 35
are being maintained. These clearances and those cited by
local and national codes must be maintained.
Note: On at roof installations the intake air and the vent
terminations must be a minimum of 24 inches (60 cm) above any
parapet, vertical wall or structure within 10 feet (3 m) horizontally.
See Figure 37.
FIGURE 36. STAINLESS STEEL AIR/VENT TERMINATION -
VERTICAL
FIGURE 37. VERTICAL TERMINATION - FLAT ROOF
CLEARANCES
FIGURE 35. PVC/CPVC AIR/VENT TERMINATION -
VERTICAL
PREPARE ROOF/WALL PENETRATIONS
1. Air pipe penetration:
Cut a hole for the air pipe. Size the air pipe hole as close as
desired to the air pipe outside diameter.
2. Vent pipe penetration:
Cut a hole for the vent pipe. For either combustible or
noncombustible construction, size the vent pipe hole with at least
a 1/2 inch clearance around the vent pipe outer diameter:
• 7½ inch (178 mm) hole for 6 inch (152 mm) vent pipe
• 8½ inch (203 mm) hole for 7 inch (178 mm) vent pipe
Insert a galvanized metal thimble in the vent pipe hole (when
required by local codes).
3. Space the air and vent holes to provide the minimum spacing
shown in Figure 35 and Figure 36.
4. Follow all local codes for isolation of vent pipe when passing
through oors, ceilings, and roofs.
5. Provide ashing and sealing boots sized for the vent pipe
and air pipe.
35
Page 36
TABLE 13. PVC, VENT PIPE, AND FITTINGS
ALL VENT PIPE MATERIALS AND FITTINGS MUST COMPLY WITH THE FOLLOWING:
ITEM MATERIAL STANDARDS FOR INSTALLATION IN:
UNITED STATES CANADA
Vent pipe and ttings PVC schedule 40 ANSI/ASTM D1785 CPVC and PVC venting must be ULC-S636 Certied.
CPVC schedule 40/80 ANSI/ASTM F441
Pipe cement/primer PVC ANSI/ASTM D2564 ULC-S636 Certied.
CPVC ANSI/ASTM F493
NOTICE: DO NOT USE CELLULAR (FOAM) CORE PIPE
TABLE 14. DIRECT VENT ALLOWABLE AIR/VENT LENGTHS
MODEL AIR INTAKE
DIAMETER
(INCH)
XP 1000 6 12 100 6 12 100
XP 1300 6 12 100 8 12 100
XP 1700 8 12 100 8 12 100
XP 2000 8 12 100 8 12 100
XP 2600 8 12 100 8 12 100
XP 3400 10 12 100 10 12 100
When determining equivalent combustion air and vent length, add 5 feet (1.5 m) for each 90° elbow and 3 feet (0.9 m) for each 45°
elbow.
EXAMPLE: 20 feet (6 m) of PVC pipe + (4) 90° elbows + (3) 45° elbows = 49 equivalent feet (15 m) of piping.
MODEL VENT DIAMETER
XP 1000 6 12 100
XP 1300 8 12 100
XP 1700 8 12 100
XP 2000 8 12 100
XP 2600 8 12 100
XP 3400 10 12 100
AIR INTAKE
MIN. LENGTH
(FT)
TABLE 15. ROOM AIR ALLOWABLE VENT LENGTHS
AIR INTAKE
MAX. LENGTH
(FT)
VENT
DIAMETER
(INCH)
VENT MIN. LENGTH
(INCH)
(FT)
VENT MIN.
LENGTH
(FT)
VENT MAX. LENGTH
VENT MAX.
LENGTH
(FT)
(FT)
36
Page 37
CONDENSATE DISPOSAL
FIGURE 38. CONDENSATE DISPOSAL SYSTEM
CONDENSATE NEUTRALIZER
FIGURE 40. CONDENSATE NEUTRALIZER
The condensate drains from the boiler have pH levels between
4.3 and 5.0. The pH measurement of a uid is an indicator of
the acidity or alkalinity. Neutral uids have pH of 7.0. Acid uids
have pH below 7. Some local codes may require the use of a
condensate neutralizer to raise the pH level of the condensate
leaving the boiler. The condensate neutralizer be must installed
between the boiler and the drain and must be installed lower
than the outlet of the condensate trap as shown in Figure 38. The
Condensate Neutralizer Kit model must be selected with respect
to the boiler's output as mentioned in the Table 16.
TABLE 16. CONDENSATE NEUTRALIZER KIT MODELS
FIGURE 39. CONDENSATE TRAP
CONDENSATE TRAP
Installation of the Condensate Trap must conform with the
instructions in this manual and local building codes. Condensate
Neutralizer Kits are available. Contact your distributor or Service
Agency. Do not remove, modify or alter the factory installed
condensate trap. Install a commercially available neutralizing kit
if required by the local codes.
The boiler is factory tted with a 24V condensate trap connected
to the controller. For safety reasons, if the condensate drain is
blocked, the control system will turn off all the ring burners and
bring the boiler to a safe shut down. If there is an air blockage
in the line, vent out the air by removing the cap. Cap acts as an
air vent for releasing any air block on down stream condensate
line. Flexible silicon hose connect from the trap through the
Condensate Neutralizer to the drain.
Due to the highly efcient operation of this unit, condensate is
formed during operation and must be removed by the condensate drain systems. Inspect the condensate drains and tubes at
least once a month and insure they will allow the free ow of
condensate at all times. The system must be inspected more
frequently in cold weather if the drain system is located in an
area, such as along the oor, where freezing tempera tures are
likely to occur. The conden sate drain system must be protected
against freezing. Contact a qualied service agent to inspect
and correct the condition if freezing of the conden sate lines is
a problem.
XP MODELS AO SMITH CONDENSATE
NEUTRALIZER KIT NUMBERS
XP 1000 9007961005
XP 1300 9007962005
XP 1700 9007962005
XP 2000 9007962005
XP 2600 9007963005
XP 3400 9007963005
37
Page 38
GAS SUPPLY CONNECTIONS
GAS SUPPLY PIPE CONNECTIONS
FIGURE 41. GAS SUPPLY PIPING
1. Make sure to install ground joint union for servicing.
In Canada – When using manual main shutoff to support the
weight of the piping with valves, ensure that it is identied by the
installer.
2. Install drip leg (sediment trap) per NFPA 54 for US and CAN
B149.1 for Canada.
3. Support the piping with hangers, not by the boiler or its
accessories. The gas valve and blower will not support the
weight of the piping. Failure to comply could result in severe
personal injury, death, or substantial property damage.
4. Purge all air from the gas supply piping.
5. Before setting the boiler in operation, check the boiler and its
gas connection for leaks.
• Disconnect the boiler from the gas supply piping system
during any pressure testing, at a test pressure in excess
of 1/2 PSIG (3.5 kPa)
• The boiler must be isolated from the gas supply piping
system by closing a manual shutoff valve during any
pressure testing, at test pressures equal to or less than
1/2 PSIG (3.5 kPa).
Do not check for gas leaks with an open ame, instead use the
bubble test. Failure to use the bubble test or check for gas leaks
can cause severe personal injury, death, or substantial property
damage.
6. Use pipe sealing compound compatible with propane gases.
Apply sparingly only to male threads of the pipe joints so that
pipe dope does not block gas ow.
Failure to apply pipe sealing compound as detailed in this
manual can result in severe personal injury, death, or substantial
property damage.
7. Make sure the maximum inlet gas pressure do not exceed
the value specied. Minimum value specied is for input
adjustment only.
Make sure to use two wrenches when tightening gas piping at the
boiler, using one wrench to prevent the boiler gas line connection
from turning. Failure to support the boiler gas connection pipe to
prevent it from turning could damage gas line components. Do
not use wrench on valve body as damage would occur.
GAS PRESSURE REQUIREMENTS
The maximum allowable gas supply pressure for this boiler is
14 inches w.c. (3.5 kPa). Install a positive lock-up gas pressure
regulator in the gas supply line if inlet gas pressure can exceed
14 inches w.c. (3.5 kPa) at any time.
If a positive lock-up regulator is required follow these instructions:
1. Positive lock-up gas pressure regulators must be rated at or
above the input Btu/hr rating of the boiler they supply.
2. Positive lock-up gas pressure regulator(s) should be
installed no closer than 3 feet (1 meter) and no farther than
8 feet (2.4 meters) from the boiler’s inlet gas connection.
3. After installing the positive lock-up gas pressure regulator(s),
an initial nominal supply pressure setting of 7 inches w.c.
(1.7 kPa) while the boiler is operating is recommended and
will generally provide good boiler operation. Some addition
adjustment maybe required later to maintain a steady gas
supply pressure.
4. When installing multiple boilers in the same gas supply
system it is recommended that individual positive lock-up
gas pressure regulators be installed at each unit.
38
Page 39
PIPE SIZES FOR PROPANE GAS
Make sure to contact the gas supplier for pipe sizes, tanks, and
100% lockup gas pressure regulator.
PURGING GAS LINE
Gas line purging is required with new piping or systems in which
air has entered. Gas purging should be performed per NFPA 54
for US and CAN B149.1 for Canada.
CHECK GAS SUPPLY INLET PRESSURE
CSA or UL listed exible gas connections are acceptable, but
make sure that the line has adequate capacity to allow your boiler
to re at full rate. Consult with local codes for proper installation
or service procedures.
Do not adjust or attempt to measure gas valve outlet pressure.
Attempting to alter or measure the gas valve outlet pressure
could result in damage to the valve, causing potential severe
personal injury, death, or substantial property damage.
Make sure the gas piping are sized for the proper ow and length
of pipe, to avoid excessive pressure drop. The gas meter and
the gas regulator must be properly sized for the total gas load.
Perform the below steps when checking inlet gas supply:
1. Turn the main power switch to the “OFF” position.
2. Shut off gas supply.
3. Remove the 1/8" pipe plug on the main gas shutoff valve
and install a suitable 1/8" tting (eld supplied) for the
manometer tubing. Place the tubing of the manometer over
the tap once the 1/8" tting is installed.
4. Slowly turn on the gas supply.
5. Ensure inlet pressure is within specied range.
6. If the gas pressure is out of range, contact the gas utility, gas
supplier, qualied installer or service agency to determine
the necessary steps to provide proper gas pressure to the
control.
CHECK FOR GAS LEAKS
Before operating the boiler, make sure to check the oor near and
around the boiler for gas odorant or any unusual odor. Remove
the top access panel and check for odor in the interior of the
boiler enclosure. Do not start the boiler if there is any indication
of a gas leak. Use an approved leak detection solution and repair
any leaks at once.
In the case of propane boilers, the supplier mixes an odorant
with the propane to make its presence detectable. But in some
instances, the odorant can fade, and the gas may no longer have
an odor. Before operating the boiler, make sure the propane
supplier verify the correct odorant level in the gas.
Do not adjust or attempt to measure gas valve outlet pressure.
The gas valve is factory set for the correct outlet pressure. This
setting is suitable for natural gas and propane, requiring no eld
adjustment. Attempting to alter or measure the gas valve outlet
pressure could result in damage to the valve, causing potential
severe personal injury, death, or substantial property damage.
39
Page 40
BOILER START UP AND OPERATIONS
IMPORTANT
Only an A.O. Smith Certied Start-up agent must perform the
initial ring of the boiler. At this time the user should not hesitate
to ask the start-up agent any questions regarding the operation
and maintenance of the unit. If you still have questions, please
contact the factory or your local A.O. Smith representative.
Contact Technical Support noted on the back cover for the name
of your closest Certied Start-Up agent.
Lighting and Operating instructions are included with this manual.
By using these instructions, the user may be able to make minor
operational adjustments and save unnecessary service calls.
However the user should not attempt repairs, but should contact
a service technician or gas supplier.
GENERAL
Never operate the boiler without rst making sure the boiler and
system are lled with water, in addition:
• Make sure a temperature and pressure relief valve
is installed in the storage tank for hot water supply
installations.
• Make sure that the boiler and system have been purged
of air and checked for leaks.
Also ensure to check the gas piping for leaks before beginning
the initial ring of the boiler.
FIGURE 42. GAS TRAIN ASSEMBLY
MANIFOLD PRESSURE CONNECTIONS
Take the manifold pressure, refer to Table 2, by removing the pipe
plug and inserting a suitable 1/8” NPT hose barb for connection to
the manometer/pressure gauge. Upon completion of measurements
and adjustments, remove the hose barb and replace the pipe
plug. Check for gas leaks and insure all connections are gas tight,
see Figure 42.
FILLING AND PURGING OF HEATING BOILER
INSTALLATION
1. Fast ll system through bypass until pressure approaches
desired system pressure. Close bypass valve and permit
pressure to be established by the pressure reducing valve.
2. Vent all high points in system to purge system of air.
Provisions should be made to permit manual venting of radiators
or convectors.
FILLING HOT WATER SUPPLY BOILER
INSTALLATION
1. Close the system’s drain valve by turning handle clockwise.
2. Open a nearby hot water faucet to permit the air to escape
3. Fully open the cold water inlet pipe valve allowing the boiler
and piping to be lled.
4. Close the hot water faucet as water starts to ow.
PURGING GAS LINE
Gas line purging is required with new piping or systems in which
air has entered.
INLET GAS PRESSURE
The inlet gas pressure is measured by removing the 1/8” NPT Plug
located on the upstream side of the supply gas valve, and insert
a 1/8” NPT hose barb tting to be connected to a manometer or
pressure gauge. Once pressure has been checked and/or adjusted,
replace the plug and check for leaks. The maximum value specied
in Table 2 on Page 6 must not be exceeded. The minimum values,
shown in Table 2, must be maintained under both load and no load
conditions (static and ring conditions). The combination gas valves
supplied with the boiler are for low pressure service. If upstream
pressure exceeds 14.0” W.C., an intermediate gas pressure
regulator of the lockup type must be installed.
WATER TEMPERATURE REGULATION
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HOT WATER CAN SCALD: Boilers are intended to produce hot
water. Water heated to a temperature which will satisfy space
heating, clothes washing, dish washing and other sanitizing
needs can scald and permanently injure you upon contact.
Some people are more likely to be permanently injured by hot
water than others. These include the elderly, children, the inrm
or physically/mentally disabled. If anyone using hot water in your
home ts into one of theses groups or if there is a local code or
state law requiring a specic temperature water at the hot water
tap, then you must take special precautions. In addition to using
the lowest possible temperature setting that satises your hot
water needs, a means such as a mixing valve should be used
at the hot water taps used by these people or at the hot water
supply tank. Mixing valves are available at plumbing supply
or hardware stores. Follow the manufacturer’s instructions for
installation of the valves. Before changing the thermostat setting
on the hot water system controller, refer to Table 17.
Hot water temperatures required for automatic dishwasher
and laundry use can cause scald burns resulting in serious
personal injury and/or death. The temperature at which injury
occurs varies with the person’s age and time of exposure. The
slower response time of children, aged or disabled persons
increases the hazards to them. Never allow small children to
use a hot water tap, or to draw their own bath water. Never
leave a child or disabled person unattended in a bathtub
or shower.
The boiler should be located in an area that is inaccessible to the
general public.
TABLE 17. RISK OF SCALDS
Water Temperature
180°F (82°C) Nearly instantaneous
170°F (77°C) Nearly instantaneous
160°F (71°C) About 1/2 second
150°F (66°C) About 1-1/2 seconds
140°F (60°C) Less than 5 seconds
130°F (54°C) About 30 seconds
120°F (49°C) More than 5 minutes
Time to Produce 2nd & 3rd
Degree Burns on Adult Skin
Should overheating occur or the gas supply fail to shut off, turn
off the main manual gas shutoff valve to the boiler.
CHECK/CONTROL WATER HARDNESS
XW Model XP Boilers are approved for use in Domestic Water
Heating Systems with a water supply hardness of 0 grains per
gallon to a maximim of 12 grains per gallon. Refer to Table 18 for
recommend ow rate to maintain scale free operation with up to
a medium water hardness. For scale free operation in hard water
systems with a water hardness greater than 12 grains per gallon,
a water softener must be installed and maintained.
TABLE 18.
WATER HARDNESS MEDIUM (0-12 GRAINS PER GALLON)
XW MODEL
∆T ºF GPM ∆P FEET
NO.
1000 25 76 17.5
1300 25 99 22
1700 25 129 23
2000 25 152 17.5
2600 25 198 22
3400 25 258 23
∆T ºF = Temperature rise ºF at the specied GPM.
GPM = Flow rate in gallons per minute.
∆P = Pressure loss through the heat exchanger in feet of head.
For systems over 5 grains per gallon; and for scale free
operation, boiler setpoint should not exceed 140 ºF.
Note: The factory installed/supplied pump on the above listed
model boilers is sized to maintian a 25 ºF ∆T through the boiler
when the boiler is ring at 100% re.
In addtion to the pressure loss through the heat exchanger,
the factory supplied pump is sized for an additional 50 feet of
equivalent feet of piping between the boiler and a storage tank.
All piping between the boiler and the storage tank must be of
a pipe size equal to the inlet/outlets of the boiler. Installation
differences may slightly change these parameters.
FREEZE PROTECTION (HYDRONIC HEATING
INSTALLATION)
1. Determine freeze protection uid quantity using system
water content, following uid manufacturer’s instructions.
2. Local codes may require a backow preventer or actual
disconnect from city water supply.
3. When using freeze protection uid with automatic ll, install
a water meter to monitor water makeup. Freeze protection
uid may leak before the water begins to leak, causing
concentration to drop, reducing the freeze protection level.
INSPECT/FILL CONDENSATE SYSTEM
Inspect/check condensate lines and ttings:
1. Inspect the condensate drain line, condensate PVC ttings
and condensate trap.
Fill condensate trap with water:
1. Remove the 2 inch PVC cap with the switch located at the
top of the trap.
2. Fill with fresh water until the water begins to pour out of the
drain.
3. Replace the cap. Press the cap onto the trap until the cap
makes contact with the drain.
The condensate trap must be lled with water during all times of
boiler operation to avoid ue gas emission from the condensate
drain line. Failure to ll the trap could result in severe personal
injury or death.
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LIGHTING AND OPERATING INSTRUCTIONS
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ADJUSTMENT
There must be sufcient load to operate the boiler at high re to
perform the following adjustments. Start the boiler and observe
proper operating parameters for the system.
Required Tools:
• TORX® T40 or 5 mm hex wrench
• 3 mm or 7/64 inch hex wrench
• Combustion analyzer
These boilers are equipped with a combined gas/air control
and gas safety shut off control valves. The valve functions in
parallel with the variable speed combustion blower to supply
the correct gas air ratio for optimum performance and efciency.
The combustion blower speed is controlled automatically and
determines the amount of negative pressure experienced by the
gas safety shut off/control valves. The gas/air regulator adjusts
gas ow to maintain the proper pressure at the outlet nozzle of
the associated valve.
SETTING OF THE TEST MODE
FIGURE 44. BURNER INFORMATION SCREEN
Click on Operation button, and under the Modulation Menu, set
the required Firing rate (High/Low) by setting the RPM.
On the Burner Home screen, select any individual boiler which
will guide to Burner Information screen.
FIGURE 43. BURNER HOME SCREEN
FIGURE 45. OPERATION SCREEN
On the Firing Rate page, set the Firing rate RPM by selecting the
Manual in Run check box.
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FIGURE 46. FIRING RATE PAGE
Page 44
HIGH FIRING RATE SETTING
Set the boiler to the high ring rate by setting the High Firing Rate RPM as described below. Check combustion readings using a
combustion analyzer. If combustion readings are not in accordance with the chart below adjust the gas valve as follows: remove the
at, round, blue plastic cap from the cover. Using a 3 mm (7/64”) hex wrench, turn the adjustment screw counterclockwise to increase
or clockwise to decrease gas ow and achieve the desired CO2 level. Refer to the Table 19 for correct settings. There will be a slight
time delay between the adjustment and the response of the CO2 measuring instrument. Adjust the settings in small increments and
allow the combustion readings to stabilize before readjusting. When desired adjustments are complete, reinstall the blue plastic cap
on the cover. Combustion samples should be taken in the stack within two feet of the boiler. The carbon monoxide (CO) values in
the combustion sample should not exceed 150 PPM under any circumstances. Contact OEM for any abnormal conditions leading to
excessive CO above 150 PPM.
TABLE 19. HIGH FIRE RATE
MODELS (XB/XW)
RPM
(APPROXIMATE FACTORY SET)
NATURAL
PROPANE NATURAL
GAS
GAS
CO
2
*MANIFOLD PRESSURE
INCHES W.C
PROPANE NATURAL GAS PROPANE
1000 (920,000) 4450 4750 8.5 - 9.2% 9.3 - 10.2% -3.5 -4.7
1300 4850 5100 8.5 - 9.2% 9.3 - 10.2% -3.0 -3.6
1700 5700 5700 8.5 - 9.2% 9.3 - 10.2% -3.6 -4.4
2000 4700 4750 8.5 - 9.2% 9.3 - 10.2% -3.9 -4.9
2600 5700 5100 8.5 - 9.2% 9.3 - 10.2% -3.3 -3.6
3400 5700 5700 8.5 - 9.2% 9.3 - 10.2% -3.5 -4.4
LOW FIRING RATE SETTING
Set the boiler to the low ring rate by setting the Low Firing Rate RPM as described below. Check combustion readings using a
combustion analyzer. If combustion readings are not in accordance with the chart shown below adjust as follows: remove the cap
on the gas regulator using a slotted screwdriver. This will expose the offset adjustment screw. Using a TORX® T40 or a 5 mm hex
wrench, carefully adjust the low re gas setting to achieve the CO2 level prescribed in Table 20.
Note: The rotation of the Low Fire adjustment is opposite of the High Fire as follows: Clockwise rotation increases gas ow,
counterclockwise rotation decreases gas ow.
Adjustments to the offset pressure regulators should not exceed 1/4 turn at a time before allowing the readings to respond and
stabilize.
After proper low re offset adjustment is made, reinstall the slotted cap on the regulator.
Following all gas valve adjustments, check for proper light-off and verify correct fuel/air mix and combustion quality throughout the
entire ring range (from lowest to highest fan speed).
Note: Make sure the Manual Mode is set back to Automatic Mode to each of the burners, once the required settings are
done. Turn off the individual burner before proceeding to the next burner settings.
TABLE 20. LOW FIRE RATE
MODELS (XB/XW)
RPM
(APPROXIMATE FACTORY SET)
NATURAL
PROPANE NATURAL
GAS
GAS
CO
2
*MANIFOLD PRESSURE
INCHES W.C
PROPANE NATURAL GAS PROPANE
1000 (920,000) 1650 1540 7.3 - 8.2% 8.4 - 8.8% -0.3 -0.25
1300 1650 1600 7.3 - 8.2% 8.4 - 8.8% -0.2 -0.14
1700 1700 1700 7.3 - 8.2% 8.4 - 8.8% -0.2 -0.23
2000 1550 1540 7.3 - 8.2% 8.4 - 8.8% -0.3 -0.31
2600 1700 1600 7.3 - 8.2% 8.4 - 8.8% -0.2 -0.14
3400 1700 1700 7.3 - 8.2% 8.4 - 8.8% -0.2 -0.23
* NOTE: Values listed in Table 19 and Table 20 are tested under laboratory conditions with minimum vent length. Values may slightly vary depending on
ambient conditions and eld equipment accuracy.
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CONTROL SYSTEM
BURNER CONTROL SYSTEM
FIGURE 47. R7910A1138 CONTROL SYSTEM
The R7910A1138 is a burner control system that provide
heat control, ame supervision, circulation pump control,
fan control, boiler control sequencing, and electric ignition
function. It will also provide boiler status and error reporting.
Multiple boilers can be joined together to heat a system instead
of a single, larger burner or boiler. Using boilers in parallel is
more efcient, costs less, reduces emissions, improves load
control, and is more exible than the traditional large boiler.
Control System consists of:
• R7910A1138 Control Device.
• S7999B Touchscreen Display—required for setup and
ModBus communication but not required for the system
to operate once the R7910A1138 is programmed.
• S7910A Local Keyboard Display Module.
• Flame Rod .
• Temperature Sensor, NTC Type 10KΩ at 77°F (25°C) or
12KΩ at 77°F (25°C).
• Limit Sensor, NTC Type 10KΩ at 77°F (25°C).
• 24V Digital I/O.
3. Three Pump Outputs with 5 selectable operation modes.
4. 24VAC:
• Output control of gas valve (Pilot and Main) and External
Ignition Transformer.
• Digital inputs for room limit control, high limit control, Gas
pressure switch, low water cutoff.
5. External spark transformer.
6. Flame Sensor.
7. Test jacks for ame signal measurement from either a ame
rod or UV ame sensor.
8. Alarm Output.
FIGURE 48. GENERAL R7910A1138 BOILER SCHEMATIC
The above gure shows two loops of heat control: Central
Heating (CH), and an optional second loop for Domestic Hot
Water (DHW) can be congured on each R7910A. The DHW
loop transfers heat from the boiler outlet to hot water appliances
in conjunction with the primary system heat loop. Priority
assignment to each heat loop can be congured to specify which
loop gets serviced rst.
OVERVIEW
Functions provided by the R7910A1138 include automatic boiler
sequencing, ame supervision, system status indication, ring
rate control, load control, CH/DHW control, limit control, system
or self-diagnostics and troubleshooting.
The R7910 maximum version of the controller offers:
1. NTC-temperature sensor for:
• Outlet Limit And Temperature.
• Stack Temperature Limit and Temperature.
• Inlet Temperature.
• Outdoor Temperature (R7910 only).
2. Modulating output PWM-driven rotation speed controlled
DC-fan for optimal modulation control.
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COMMUNICATIONS AND DISPLAYS
Two modes of communications are available to the R7910.
1. The R7910 has two RS485 communication ports for
ModBus that allows for interfacing to one or all R7910s of
a system and presents them individually to the user. The
S7999B System Operator interface is a color touchscreen
displays used for conguration and monitoring of the
R7910A. Control Operation and display status in both test
and graphical modes can be shown along with the ability to
setup. The R7910 can also be remotely reset through the
S7999B display.
2. Either ModBus RS485 communication port can be used to
allow conguration and status data to be read and written
to the R7910. Support a Master S7999B or a Building
Automation master to control the R7910 to respond to
a single ModBus address to service the requests of the
ModBus master in a Lead/Lag arrangement.
The local S7910 Keyboard display, the S7999B System Operator
interface, and the S7999C Local Operator Interface are optional
components.
The S7999B (or the DSP3944 which is a portable S7999B) or is
required conguration of the parameters of the R7910 but is not
needed for the operation of the system once congured.
SPECIFICATIONS
1. Electrical Ratings:
Operating voltage
• 24VAC (20 to 30 VAC, 60 Hz ±5%)
• 30 amps (Single Heat Exchanger)
• 60 amps (Double Heat Exchanger)
Connected Load for Valve and annunciator functions:
• 24VAC, 60Hz
• 120VAC (+10%/-15%), 60Hz (±5%)
• Model Specic
2. Corrosion:
• R7910A must not be used in a corrosive environment.
3. Operating Temperature: -4°F to 150°F (-20°C to 66°C)
4. Storage/Shipping Temperature: -40°F to 150°F (-40°C to
66°C).
5. Humidity:
• Up to 95% Relative Humidity, noncondensing at 104°F for
14 days. Condensing moisture may cause safety shutdown.
6. Vibration: 0.0 to 0.5g Continuous (V2 level)
7. Enclosure: Nema 1/IP40.
8. Approvals:
Underwriters Laboratories, Inc. (UL): Component Recognized:
File No. MP268 (MCCZ)
• R7910 is certied as UL372 Primary Safety Controls.
• The R7910 is certied as UL353 Limit Rated device when
using part number 50001464 dual element limit rated NTC
sensors.
CSD-1 Acceptable.
Meets CSD-1 section CF-300 requirements as a Primary Safety
Control.
Meets CSD-1 section CW-400 requirements as a Temperature
Operation control.
Meets CSD-1 section CW-400 requirements as a Temperature
High Limit Control when congured for use with 10 kohm NTC
sensors.
Federal Communications Commission, Part 15,
Class B. Emissions.
BURNER CONTROL OPERATION
SAFETY SHUTDOWN OF BURNER CONTROL FUNCTIONS
Safety Shutdown (Lockout) occurs if any of the following occur
during the indicated period:
1. INITIATE PERIOD:
a. A/C line power errors occurred.
b. Four minute INITIATE period has been exceeded.
2. STANDBY PERIOD:
a. Flame signal is present after 240 seconds.
b. Preignition Interlock is open an accumulative time of 30
seconds.
c. Interlock Start check feature is enabled and the Interlock
String (including Airow Switch) is closed for 120 seconds with
the controller closed. (jumpered or welded Interlock).
d. Main Valve Terminal is energized.
e. Internal system fault occurred.
3. PREPURGE PERIOD:
a. Preignition Interlock opens anytime during PREPURGE
period.
b. Flame signal is detected for 10 seconds accumulated time
during PREPURGE.
c. Purge Rate Fan RPM or High Fire Switch fails to close within
four minutes and fteen seconds after the ring rate motor
is commanded to drive to the high re position at the start of
PREPURGE.
d. Light off Rate Fan RPM or Low Fire Switch fails to close
within four minutes and fteen seconds after the ring rate motor
is commanded to drive to the low re position at the end of
PREPURGE.
e. Lockout Interlock (if programmed) does not close within 10
seconds.
f. Lockout Interlock opens during PREPURGE.
g. Pilot Valve terminal is energized.
h. Main Valve terminal is energized.
i. Internal system fault occurred.
4. PRE-IGNITION TIME
a. Lockout Interlock opens.
b. IAS Purge and Ignition enabled and the Interlock opens.
c. Preignition Interlock opens.
d. Pilot Valve terminal is energized.
e. Main Valve terminal is energized.
5. PILOT FLAME ESTABLISHING PERIOD (PFEP):
a. Lockout Interlock opens (if enabled).
b. Pilot Valve terminal is not energized.
c. No ame is present at the end of the PFEP, or after programmed
number of retry attempts.
d. Main valve terminal is energized.
e. Internal system fault occurred.
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6. MAIN FLAME ESTABLISHING PERIOD (MFEP):
a. Lockout Interlock opens (if enabled).
b. Pilot valve terminal is not energized.
c. Main valve terminal is not energized.
d. No ame present at the end of MFEP.
e. Internal system fault occurred.
7. RUN PERIOD:
a. No ame is present, or ame is lost (if enabled-lockout).
b. Lockout Interlock opens) if enabled).
c. IAS Purge and Ignition enabled and the Interlock opens.
d. Pilot terminal energized (if programmed as Interrupted Pilot).
e. Main valve terminal is not energized.
f. Internal system fault occurred.
8. POSTPURGE PERIOD:
a. Preignition Interlock does not close in ve seconds.
b. Pilot Valve terminal is energized.
c. Main Valve terminal is energized.
d. Internal system fault occurred.
e. Flame sensed 240 seconds accumulated time after the RUN
period.
SAFETY SHUTDOWN:
1. If the lockout interlocks open or a sensor designated as a
safety limit are read as defective, Control System will lockout
and the blower motor will be de-energized.
If these open during the ring period, all fuel valves will be deenergized, the system will complete postpurge, and will lockout
indicated by an alarm.
2. If the pilot ame is not detected by the end of the last (3
number recycle attempt), pilot trial for ignition period, the
pilot valve, and ignition transformer will be de-energized, the
system will complete post purge and will lockout indicated
by an alarm.
3. If the main ame is not detected at the end of the last recycle
attempt of the main ame establishing period, all fuel valves
will be de-energized, the device will complete postpurge,
and will lockout indicated by an alarm.
4. If the ame sensing signal is lost during the run period (if
lockout is selected), all fuel valves will be de-energized within
4 seconds after the loss of the ame signal, the device will
complete postpurge, and will lockout indicate by an alarm.
5. Manual reset is required following any safety shutdown.
Manual reset may be accomplished by pressing the push
button on the device, pressing the remote reset wired into
connector J10, or through an attached display.
Interrupting power to Control System will cause electrical resets,
but does not reset a lockout condition.
GENERAL OPERATIONAL SEQUENCE
INITIATE
The R7910 enters the Initiate sequence on Initial Power up or:
• Voltage uctuations vary less than 20VAC or greater than
30VAC.
• Frequency uctuations vary +/-5% (57 to 63 Hz).
• If Demand, LCI, or Stat interrupt (open) during the Prepurge
Period.
• After the reset button is pressed or fault is cleared at the
displays.
The Initiate sequence also delays the burner motor from being
energized and de-energized from an intermittent AC line input or
control input.
If an AC problem exists for more than 240 seconds a lockout will
occur.
HYDRONIC/CENTRAL HEATING
Start-up sequence central heating request (system in standby):
1. Heat request detected (On Setpoint - On Hysteresis).
2. The CH pump is switched on.
3. After a system Safe Start Check, the Blower (fan) is switched
on after a dynamic ILK switch test (if enabled).
4. After the ILK switch is closed and the purge rate proving fan
RPM is achieved (or High Fire Switch is closed) - prepurge
time is started.
5. When the purge time is complete, the purge fan RPM is
changed to the Lightoff Rate or if used, the damper motor is
driven to the Low Fire Position.
6. As soon as the fan-rpm is equal to the light-off rpm (or the
Low Fire Switch closes), the Trial for Ignition or Pre-Ignition
Time is started.
7. Pre-Ignition Time will energize the ignitor and check for
ame.
8. Trial for Ignition. Specics for timings and device actions are
dened by the OEM or installer.
9. The ignition and the gas valve are switched on.
10. The ignition is turned off at the end of the direct burner
ignition period, or for a system that does use a pilot, at
the end (or optionally at the middle) of the Pilot Flame
Establishing Period (PFEP). For an interrupted pilot system
this is followed by a Main Flame Establishing Period (MFEP)
where the pilot ignites the main burner. For an intermittent
pilot there is no MFEP.
11. The fan is kept at the lightoff rate during the stabilization
timer, if any.
12. Before the release to modulation, the fan is switched to
minimum RPM for the CH Forced Rate and Slow Start
Enable, if the water is colder than the threshold.
13. At the end of the CH-heat request the burner is switched off
and the fan stays on until post purge is complete.
14. A new CH-request is blocked for the forced off time set by
the Anti Short Cycle (if enabled).
15. The pump stays on during the pump overrun time (if
enabled).
16. At the end of the pump overrun time the pump will be
switched off.
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DOMESTIC HOT WATER
Start-up sequence DHW-request (system in standby):
1. Heat request detected (either DHW Sensor Only, DHW
Sensor and Remote Command or DHW Switch and Inlet
Sensor, whichever applies).
2. The pump is switched on (after the DHW Pump Start Delay).
3. After a system Safe Start Check, the Blower (fan) is switched
on after a dynamic ILK switch test (if enabled).
4. After the ILK switch is closed and the purge rate proving fan
RPM is achieved (or High Fire Switch is closed) - prepurge
time is started.
5. When the purge time is complete, the purge fan RPM is
changed to the Lightoff Rate or if used, the damper motor is
driven to the Low Fire Position.
6. As soon as the fan-rpm is equal to the light-off rpm (or the
Low Fire Switch closes), the Trial for Ignition or Pre-Ignition
Time is started (depending on conguration).
7. Pre-Ignition Time will energize the ignitor and check for
ame.
8. Trial for Ignition. Specics for timings and device actions are
dened by the OEM or installer.
9. The ignition and the gas valve are switched on.
10. The ignition is turned off at the end of the direct burner
ignition period, or for a system that does use a pilot, at
the end (or optionally at the middle) of the Pilot Flame
Establishing Period (PFEP). For an interrupted pilot system
this is followed by a Main Flame Establishing Period (MFEP)
where the pilot ignites the main burner. For an intermittent
pilot there is no MFEP.
11. The fan is kept at the lightoff rate during the stabilization
timer, if any.
12. Before the release to modulation, the fan is switched to
minimum RPM for the DHW Forced Rate and Slow Start
Enable, if the water is colder than the threshold.
13. At the end of the DHW-heat request the burner is switched
off and the fan stays on until post purge is complete.
14. A new DHW-request is blocked for the forced off time set by
the Anti Short Cycle (if enabled).
15. The pump stays on during the pump overrun time (if
enabled).
16. At the end of the pump overrun time the pump will be
switched off.
LEAD LAG
Burner Control System devices contain the ability to be a standalone control, operate as a Lead Lag Master control (which also
uses the burner control function as one of the slaves), or to
operate solely as a slave to the lead lag system.
Control System devices utilize two ModBus™ ports (MB1
and MB2) for communications. One port is designated to
support a system S7999B display and the other port supports
communications from the LL Master with its slaves.
The Lead Lag master is a software service that is hosted by a
Control System. It is not a part of that control, but is an entity
that is “above” all of the individual burner controls (including the
one that hosts it). The Lead Lag master sees the controls as a
set of Modbus devices, each having certain registers, and in this
regard it is entirely a communications bus device, talking to the
slave buner controls via Modbus.
The LL master uses a few of the host Buner Control's sensors
(header temperature and outdoor temperature) and also the
STAT electrical inputs in a congurable way, to provide control
information.
LEAD LAG (LL) MASTER GENERAL OPERATION
The XP Boiler is a multiple burner application and it works on
the basis of the Lead Lag Operation. The XB Boiler is factory
congured for Hydronic/Central Heating application, whereas the
XW Boiler is factory congured for Domestic Hot Water application.
The LL master coordinates the ring of its slave Control Systems.
To do this it adds and drops stages to meet changes in load, and
it sends ring rate commands to those that are ring.
The LL master turns the rst stage on and eventually turns the
last stage off using the same criteria as for any modulation
control loop:
• When the operating point reaches the Setpoint minus the
On hysteresis, then the rst Control System is turned on.
• When the operating point reaches the Setpoint plus the Off
hysteresis then the last slave Control System (or all slave
Control Systems) are turned off.
The LL master PID operates using a percent rate: 0% is a
request for no heat at all, and 100% means ring at the maximum
modulation rate.
This ring rate is sent to the slaves as a percentage, but this is
apportioned to the slave Control Systems according to the rate
allocation algorithm selected by the Rate allocation method
parameter.
For some algorithms, this rate might be common to all slave
Control Systems that are ring. For others it might represent the
total system capacity and be allocated proportionally.
For example, if there are 4 slaves and the LL master's percent
rate is 30%, then it might satisfy this by ring all four slaves at
30%, or by operating the rst slave at 80% (20% of the system’s
capacity) and a second slave at 40% (10% of the system’s
capacity).
The LL master may be aware of slave Control System’s minimum
ring rate and use this information for some of its algorithms,
but when apportioning rate it may also assign rates that are less
than this. In fact, the add-stage and drop-stage algorithms may
assume this and be dened in terms of theoretical rates that are
possibly lower than the actual minimum rate of the Burner Control
System. A Control System that is ring and is being commanded
to re at less than its minimum modulation rate will operate at
its minimum rate: this is a standard behavior for a Buner control
system in stand-alone (non-slave) mode.
If any slave under LL Master control is in a Run-Limited condition,
then for some algorithms the LL master can apportion to that
stage the rate that it is actually ring at. Additionally when a
slave imposes its own Run-limited rate, this may trigger the LL
Master to add a stage, if it needs more capacity, or drop a stage
if the run-limiting is providing too much heat (for example if a
stage is running at a higher-than commanded rate due to anticondensation).
By adjusting the parameters in an extreme way it is possible
to dene add-stage and drop-stage conditions that overlap or
even cross over each other. Certainly it is incorrect to do this,
and it would take a very deliberate and non-accidental act to
accomplish it. But there are two points in this:
1. LL master does not prevent it, and more important;
2. It will not confuse the LL master because it is implemented
as a state machine that is in only one state at a time;
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For example:
— If its add-stage action has been triggered, it will remain in this
condition until either a stage has been added,
Or
— The criteria for its being in an add-stage condition is no longer
met; only then will it take another look around to see what state
it should go to next.
DEFINITIONS
Modulating stage: The modulating stage is the Control System
that is receiving varying ring rate requests to track the load.
First stage: This is the Control System that was turned on rst,
when no slave Control Systems were ring.
Previous stage: The Control System that was added to those
stages that are ring Just prior to the adding of the Control
System that is under discussion.
Next stage: The Control System that will or might be added as
the next Control System to re.
Last stage: The Control System that is ring and that was added
the most recently to the group of slaves that are ring. Typically
this is also the modulating stage, however as the load decreases
then the last-added stage will be at its minimum rate and the
previous stage will be modulating.
Lead boiler: The Lead boiler is the Control System that is the
rst stage to re among those stages which are in the equalize
runtime (Lead/Lag) group. If a boiler is in the “Use rst” group it
may re before the Lead boiler res.
First boiler: A Control System may be assigned to any of three
groups: “Use First”, “Equalize Runtime”, or “Use Last”. If one or
more Control Systems are in the “Use First” category, then one
of these (the one with the lowest sequence number) will always
be the rst boiler to re. If there is no Control System in the “Use
First” category and one or more are in the “Equalize Runtime”
category, then the First boiler is also the Lead boiler.
LOCAL OPERATOR INTERFACE: DISPLAY SYSTEM
FIGURE 49. BURNER CONTROL S7999B DISPLAY SYSTEM
The S7999B is a microprocessor-based touchscreen Operator
Interface (OI) display that provide an operator interface for
monitoring and conguring parameters in the Burner Control
system.
The S7999B can be used to monitor an individual boiler but
is primarily used for multiple boiler applications in a lead/lag
arrangement. COM 2 port is available for Building Automation
applications. The S7999B display is ush mounted into a panel
cutout (8-1/8 in. W x 5-7/8 in. H). Wiring connections to the
S7999B are through a removable 9-pin wiring header.
FEATURES
• Individual boiler status, conguration, history, and
diagnostics.
• Allows conguration and monitoring of the Burner Control
Controls burner control sequence, ame signal, diagnostics,
historical les, and faults.
• S7999B OI Display only:
• Allows switching view between multiple boilers
• Allows viewing Lead-Lag Master
• Ethernet port for downloading software upgrades (when
required)
• Real-time data trending analysis and transferring saved
trend data to Excel spreadsheet.
• Audible Alarm
• COM 2 Modbus port for Building Automation System
applications.
• LED indicators:
• Power
• Network
• COM 2
• COM 1
• Model used:
• S7999B1067 has Black Border
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• Allows for lead/lag commissioning.
• Locates attached boiler(s).
• Allows boiler naming.
• Color 3.5 in. x 4.625 in. (5.7 in. diagonal) user interface
display.
• Graphic user interface.
• Touch screen.
• Communication between the OI Displays and the Burner
Control Systems uses Modbus™.
• Flush mounting.
• Touch screen disable for screen cleaning.
• 12 VDC power supply (included).
• Screen saver.
• Contrast control.
• Volume control.
SPECIFICATIONS
1. Electrical Ratings:
+12 VDC input, maximum of 500 mA current drain.
Included Power Supply for S7999B:
• Inputs: 85 to 264 VAC, 47 to 63 Hz; 120 to 370 VDC.
• Output: 12 VDC; 0 to 2.1 A.
• Power: 25 W.
2. Operating Temperature: 32°F to 122°F (0°C to 50°C)
3. Storage/Shipping Temperature: -40°F to 158°F (-40°C to
70°C).
4. Humidity: 85% maximum relative humidity.
5. Approvals:
FCC Part 15, Class A Digital Device
Underwriter’s Laboratories, Inc. (UL) Component Recognized
(for non-continuous operation): File Number MH20613 (MCCZ)
Canada: ICES-003
INSTALLATION INSTRUCTIONS (S7999B OI DISPLAY)
MOUNTING THE S7999B OI DISPLAY AND POWER SUPPLY
The OI Display can be mounted on the door panel of an
electrical enclosure.
1. Select the location on the door panel to mount the display;
note that the device will extend into the enclosure at least
one inch past the mounting surface.
2. Provide an opening in the panel door 8-1/8 in. wide by
5-7/8 in. high.
3. Place the OI Display in the opening and use it as a
template to mark the location of the four mounting screw
holes. Remove the device.
4. Using pilot holes as guides, drill 1/4 in. holes through the
door panel.
5. Place the display in the opening, aligning the mounting
holes in the device with the drilled holes in the panel.
6. Secure the display to the panel with four #6-32 screws and
nuts provided.
7. Select a location inside the enclosure for mounting the
power supply.
8. Using the power supply as a template, mark the locations
of the two mounting holes in the enclosure.
9. Remove the power supply.
10. Drill 1/4 in. holes through the panel at the marked locations
and secure the power supply with the two #6-32 screws
and nuts provided.
11. Remove the 9-pin connector plug from the back of the OI
Display.
12. Wire the connector to the power supply and the RS-485
cables.
13. Ensure the 9-pin connector plug is aligned with the header
pins when inserting the 9-pin connector plug back onto the
Display. Secure rmly.
FIGURE 50. S7999B OI DISPLAY CONNECTOR TERMINALS
QUICK SETUP (S7999B OI DISPLAY)
1. Make sure the S7999B 9-pin connector is properly aligned
and pressed rmly in place.
2. Make sure the wires between the 9-pin connector and the
controller are properly wired and secure.
WARNING: Electrical Shock Hazard. Can cause severe injury,
death or equipment damage. Line voltage is present at the 120
VAC power supply.
3. Make sure the power supply is connected securely to the
120 VAC power source.
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STARTING UP THE S7999B OI DISPLAY
POWER-UP VALIDATION
The Home page will appear and the “Power” LED will be blinking
when the device is properly powered. Select the Setup button to
adjust the contrast and sound as desired.
If the screen is dim, check the pin 1 and 2 wiring connections.
Note: An Advanced Startup screen displays for ve seconds after
power-up before the Home page displays. This screen allows the
user to upgrade the software in the System Display and should
normally be bypassed.
Three LEDs exist for I/O trafc: one for the Ethernet network port
and two for Modbus™ ports. Modbus Com Port 2 is not active
on this device.
1. Make sure the Power and COM1 LEDs are blinking.
2. If the LEDs are not blinking:
• Make sure the proper connections have been made
between the Modbus COM1 Port and the rst controller
device in the Modbus network.
• Ensure proper wiring of the OI Display 9-pin Header
Connections.
3. If connected to a BAS application, COM2 LED will blink
indicating BAS trafc.
HOME PAGE (S7999B OI DISPLAY)
Make sure a screen similar to Figure 51 appears after the OI
Display has completely powered up.
On System applications, each Burner Control System is
represented on the Home page by an icon and name. Pressing
the icon allows the user to zoom in on that boiler and see its
specic details. These details are provided on a new page, which
can include additional buttons that display additional detail and
operation information, which itself leads to other pages. The
pages are traversed in a tree structure method, as shown in
Figure 53 on Page 52.
The Control System icons will appear in one of four colors
indicating the boiler status.
• Blue: Normal operation
• Red: Lockout condition
• Gray: Standby mode (burner switch off)
• Gray and crossed out: communication error
(disconnected or powered off)
• Yellow: Preparing for Start-up.
Up to 8 Systems can be displayed on the Home page. The name
of each boiler is displayed next to the Control System icon button.
When Lead Lag is enabled, the system header temperature and
ring rate are displayed for each System. When the burner is in
standby or not ring the ring rate is not displayed.
Note: The boiler name may be cut off on the Home page when
all icons are present.
The Home page also includes a System Analysis button that
allows the user to view status information on a system-wide
(that is, multiple boiler) basis. The user can choose which status
information to compare from the Burner Controls in the system.
Pressing the Setup button on the Home page displays
miscellaneous setup and diagnostic functions. It also contains
the setup conguration for BAS applications, under the Advanced
Setup button. Pressing the Control System icon opens that
control’s status page.
FIGURE 51. S7999B HOME PAGE
(BOILER 1 IN NORMAL OPERATION)
PAGE NAVIGATION
The Burner Control System OI Displays present information
and options in a paged manner. Pages are displayed in a tree
structure in which the user navigates up and down to arrive at
the desired Function (see Figure 53). The page descriptions
are provided below so that you can understand the purpose of
each and view the selections, parameters, and information that
is available or required on each.
COMMON OI DISPLAY PAGE SYMBOLS
Most pages have a Home button in the top-left corner of the
screen and a Back button in the top-right corner of the screen.
The Home button returns the user to the Home page and
terminates any operation in progress. The Back button returns
the user to the previous page.
Two other icons may be noticed near the boiler name.
A bell will be displayed if the system is in Lockout that reset will
be required.
A padlock will be shown on screens that require a password
to change the parameter. An unlocked padlock indicates the
password has been entered to change the parameter.
FIGURE 52. S7999B LEAD LAG HOME PAGE
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FIGURE 53. S7999B DISPLAY PAGE FLOW
52
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STATUS OR HOME PAGE
A status (summary) page (Figure 54) is displayed when the
S7999B display is connected. This status page appears on the
S7999B when the Burner control icon is pressed on the “Home”
page. The status page displays the current condition of the burner
control and displays some of the more important conguration
settings.
The boiler name associated with the burner control is displayed
in the title on the status page.
Note: When the burner control has no boiler name dened,
Modbus address is used to identify the boiler.
The initial status page displayed contains summary status
information as shown in Figure 54. Any status information not
applicable for the installation is grayed/blanked out on the screen.
Buttons on this screen include:
• Congure: used to congure the burner control
(password protected).
• Operation: used to perform daily or frequent functions
with the burner control, such as setpoint adjustment, etc.
• Diagnostic: used to view burner control diagnostic
information.
• Details: used to view burner control detail status
information.
• History: used to view burner control history
• Pump: used to expand the pump status information.
• Modulation: used to toggle between status displays:
pump, setpoints, and modulation.
CONFIGURE BUTTON
Pressing the Congure button (bottom left) on the Status page
opens the Conguration page.
The S7999B Conguration page does not have a “Display Setup”
button.
The conguration page allows the user to view and set parameters
that dene how the connected R7910A functions in the hydronic
heating system. All parameters are factory congured and only
a Field Service Agent must perform the conguration settings.
The conguration page contains a menu of parameters grouped
into functional areas that the user selects for conguration (see
Figure 55).
No specic order for conguration is required. All parameters
are enabled for editing, though some may not be applicable
(e.g., a conguration parameter may disable a control feature).
Selecting a parameter group from the menu displays parameters
exclusively applicable for the functional group on the page (see
Figure 56). These parameters can be edited, and when the user
is nished, control returns back to the conguration menu page.
Each parameter is displayed in its group. If there are more
parameters than will t on the screen, a vertical scroll bar allows
the user to scroll up and down to view all parameters. The
parameter name is displayed on the left and the current setting is
displayed in the text box on the right.
FIGURE 54. SUMMARY STATUS PAGE
FIGURE 55. CONFIGURATION MENU PAGE
FIGURE 56. SAMPLE CONFIGURATION PAGE
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CONFIGURATION PASSWORD
Some parameters require a valid conguration password be
entered by the user before the parameter can be changed. The
password need only be entered once while the user remains on
the conguration pages. Leaving the conguration pages ends
the scope of the password.
Three levels of access to Burner Control parameters are
permitted. Each access level has dened rights when interfacing
with conguration and status parameters within the controls.
• End user: The end user can read or view the control
parameters and be allowed to change some operating
parameters, CH setpoint as an example.
• Installer: The installer can read all control parameters
and change default allowed parameters. This access
level is used to customize the control for a particular
installation.
• OEM: The OEM can read and change all parameters,
change sensor limits and burner control safety
parameters.
Different passwords exist in the Burner Control for each access
level. The end user level requires no password, but the installer
and OEM levels have unique passwords dened for them.
The installer and OEM passwords can be changed in the Burner
Control after logging in with the current password. When the
password is changed, it is saved for all future logins.
Note: For the S7999B System OI display, each boiler in a
multi-boiler conguration has its own set of installer and OEM
passwords. To avoid user confusion, the passwords should be
changed to the same password in each control, but there is no
requirement to do so. Make sure to record your password.
The user is notied that a new password is needed to change
a parameter (or until a password is entered successfully)—see
Figure 57. The user can continue viewing the conguration
parameters regardless of whether a password is entered
successfully.
The Burner Controls maintain a password time-out that limits the
scope of the password entry. Once a password is successfully
entered, the control starts an internal timer that expires after 10
minutes of inactivity. After the timer expires, the user is required
to re-enter a password before a parameter can be changed.
The user is not required to enter a conguration password for a
parameter that has a lower access level than the access level
achieved by an earlier password entry for any conguration
group (as long as the user stays in the conguration pages). The
user only needs to enter a password once until a parameter that
has a higher access level is selected.
KEYBOARD
Some pages request user entry of characters. When this type of
input is required, a keyboard page appears, as shown in Figure
58. The text box at the top of the screen displays the current (or
default) setting of the user input. The user can add to this text,
clear it, or change it.
The Shift key on the left side of the screen shifts between upper
and lowercase characters. Pressing the Shift key toggles the
keyboard from one mode to the other (continuous pressing of the
Shift button is not required). The OK button should be pressed
when the user is done entering the text input. The Cancel button
on the bottom of the screen allows the user to ignore any text
changes that have been made and keep the original text value.
Pressing the OK or Cancel buttons returns the user to the page
displayed prior to the keyboard page.
LOGIN
Pressing the Login button allows entering the password from a
keyboard as shown in Figure 58. After the password is entered,
the OK button is selected. The Cancel button aborts the password
login.
FIGURE 58. DEVICE LOGIN SCREEN
WARNING: Explosion Hazard. Improper conguration can cause
fuel buildup and explosion. Improper user operation may result in
property loss, physical injury or death.
Using the OI Displays to change parameters must be attempted
by only experienced and/or licensed burner/boiler operators and
mechanics.
CHANGE PARAMETER SETTINGS
Change parameter settings by selecting the parameter on the
page. A dialog box displays for the parameter with controls
allowing the user to change the value (see Figure 59 on Page 55).
After changing the setting to a new value, press the OK button.
Pressing the Cancel button leaves the parameter unchanged.
The changed setting is reected on the screen and sent to the
control when the OK button is pressed.
FIGURE 57. LOGIN REQUIRED
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FIGURE 59. EXAMPLE OF CHANGE CONFIGURATION
PARAMETER PAGE
VERIFY
Pressing the Verify button displays safety conguration
parameters for an additional verication step to commit the
changes.
Safety parameters are grouped into blocks that include only
safety parameters, not a mixture of safety data and non-safety
data. All parameters within the safety group undergo a verication
process. A safety parameter group is identied on the display to
indicate when the conguration parameters are safety-related.
Each safety parameter group is veried one at a time until all
have been veried. See Figure 60.
Note: When the installer proceeds with the safety parameter
conguration, the control unlocks the safety parameters in this
group and marks them unusable. Failure to complete the entire
safety conguration procedure leaves the control in an unrunnable state (lockout 2).
All safety conguration parameters in the group should have the
same access level. If this condition isn’t so, the user is asked to
enter another password when a higher access level is needed.
Successful login is noted by the lock icon, which changes
to “unlocked” on the page. The installer may begin to change
safety parameters (or any other parameters) at that time (see
Figure 61). If the Burner Control is in an uncongured (or new)
state, then this warning doesn’t appear. All parameters that need
changes should be changed during the login.
FIGURE 60. SAFETY VERIFICATION
Like operating parameters, safety parameters can be viewed
without the need to enter a password.
Safety parameter blocks that have been changed require
verication. The verication steps do not have to be completed
immediately; the installer can move between and change
parameter groups before the verication is done. A Verify button
is enabled that allows the installer to conduct verication sessions
(the example of the Verify button in Figure 55 is not yet enabled
because the installer hasn’t logged in).
FIGURE 61. EDIT SAFETY DATA
If the safety conguration session is terminated after it has
started (in the Edit or Verify stages), the Burner Control is left in
an uncongured (unrunnable) state.
The installer can terminate the session by pressing the Menu
button or by attempting to leave the Verication page with
the Home or Back buttons (top-left and -right screen corners,
respectively). However, leaving the session at this point leaves
the control in an unrunnable state and conrms whether the
installer still wants to do so.
The settings of all parameters in each safety block must be
veried to save them in the control.
When the installer is done changing safety parameters,
pressing the Verify button on the conguration screen begins
the Verication process. The settings for all safety parameters
in each changed block are presented and Veried by the installer
(see Figure 62 on Page 56).
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FIGURE 62. SAFETY PARAMETER CONFIRMATION
Press the Yes button to conrm each safety parameter block. If
the No button is selected, the safety parameter block remains
unconrmed and the Conguration menu page is displayed. The
control remains in an uncongured state in this case.
After all safety parameter blocks have been conrmed, the
installer is asked to press and hold the Reset button on the
Burner Control to complete the safety verication session (see
Figure 63).
FAULT/ALARM HANDLING
Each Burner Control reports to the OI display when a safety
lockout or an Alert occurs.
Safety lockouts are indicated on each conguration page as an
alarm bell symbol. At the status page (for S7999B), the History
button turns red. If the S7999B is displaying the system status
icons, the control in alarm will turn red.
The lockout history can be displayed by pressing on the History
button. The state information about each lockout is displayed
along with the date/time that the lockout occurred (refer to Table
21). Current date/time stamp is a display setup feature.
Note: In the event of a power interruption, the date/time must be
reset. The OI Display does NOT have a backup means.
TABLE 21. BURNER CONTROL LOCKOUT HISTORY
DATA COMMENT
Lockout time Set by display
Fault Code Unique code dening which
lockout occurred.
Annunciator rst out First interlock in limit string
results in a shutdown.
Description Fault description
Burner Lockout/Hold Source/reason for lockout/
hold
Burner control state
Sequence time Burner control state timer at
time of fault
Cycle Burner control cycle
Run Hours Burner control hours
I/O All digital I/O status at time of
fault
Annunciator 1-8 states All annunciator I/O status at
time of fault
Fault data Fault dependent data
An alert log can be displayed for each control by pressing the Alert
button on the bottom of the history status page. A description of
the alert is displayed along with the time when the alert occurred
(refer to Table 22).
TABLE 22. BURNER CONTROL ALERT LOG
FIGURE 63. SAFETY PARAMETER RESET
When the Reset button is pressed and held for 3 seconds the
conrmed safety parameters are saved in the control. The
above Reset dialog box automatically closes when this step is
completed.
If this step is not performed, the control remains in a safety lockout
state until the installer resolves the unveried safety parameters.
DATA COMMENT
Alert Line Set by display
Alert Code Unique Code dening which
fault occured.
Description Alert description
HISTORY BUTTON
The History button on the Home page serves not only as a
button, but also displays Burner Control lockouts, holds, and
alerts as they occur. The History button can be selected at any
time, regardless of which type of information is displayed, to view
history information. Pressing the History button displays a dialog
box (see Figure 64 on Page 57) that allows the user to select
the type of history to view. The user can also silence an audible
alarm generated by the control during a lockout or alert by alarm
condition.
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This History dialog box provides an exploded view of the status
information displayed in the History button (the font is larger).
One of the four buttons (OK, Lockouts, Alerts, or Silence) can
be selected. If none of these buttons are selected the dialog box
closes after 30 seconds.
FIGURE 64. EXAMPLE OF HYDRONIC HISTORY
Two types of historical data can be displayed on the history page:
lockout history and alert log.
The entire 15 fault code history is displayed in a scrollable list
with the most recent fault displayed rst followed by the next
most recent fault. Summary information is displayed for each
fault entry, including the burner cycle count, fault code, and fault
number with description. Detailed information for a specic fault
entry that also includes burner control sequence state, burner
run-time hours, annunciation status, etc., is viewed by selecting
(touching the History line) the lockout entry in the list.
Note: The system time can be set in the OI display to ensure that
correct timestamps are given to the controls’ lockouts and alerts.
Power interruptions will require the time to be reset as the display
DOES NOT have a time backup means.
The Clear Lockout button allows the user to acknowledge and
clear (reset) the lockout when in lockout state, much the same
as pressing the reset button on the front of the Burner Control.
The user can toggle between displaying the controls’ lockout
history and alert log by pressing the Alerts or Lockouts button on
the bottom of the pages.
FIGURE 66. EXAMPLE OF ALERT SHOWN
To see additional detail about a lockout or alert, touching on the
lockout or alert in the list expands the view of that lockout or alert,
as shown in Figure 65 and Figure 66.
FIGURE 65. EXAMPLE OF LOCKOUT HISTORY
The date and time that each fault occurred is displayed in the
lockout history. The lockout timestamp displays in both the
lockout summary and detail information.
The Burner Control does not maintain date or time of day
information. The date and time stamp is assigned by the OI
display. When the OI display rst obtains the lockout and alert
history from the control (during the display data synchronization),
no timestamps are assigned since the times that the lockouts
occurred are unknown. All new lockouts that occur after the
synchronization are assigned timestamps.
FIGURE 67. CONTROL EXPANDED LOCKOUT DETAIL
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FIGURE 68. CONTROL EXPANDED ALERT DETAIL
OPERATION BUTTON
The operation button displays the Burner Control running
operation, including setpoint and ring rate values. From this page
the user can change setpoints, manually control the boiler’s ring
rate, manually turn pumps on, view annunciation information,
and switch between hydronic heating loops (Central Heat and
Domestic Hot Water), as shown in Figure 69. If a password is
required to change any of the settings on this page, the user can
press the Login button to enter the password.
Annunciation information is shown in Figure 70 and Figure 71.
FIGURE 70. PROGRAMMABLE ANNUNCIATION
FIGURE 71. FIXED ANNUNCIATION
FIGURE 69. HYDRONIC OPERATION PAGE
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DIAGNOSTICS BUTTON
The Diagnostics button displays analog and digital I/O status
of the Burner Control. A snapshot of the diagnostic status is
displayed and updated once per second as it changes in the
control.
The digital I/O data is displayed as LEDs that are either on
(green) or off (red) (See Figure 72). Not all digital I/O can be
displayed at the same time on the page, so a horizontal scroll bar
is used to move the view left and right to show all digital I/O data.
SYSTEM CONFIGURATION (S7999B OI DISPLAY ONLY)
The OI Display has some functions related to general
conguration for the control in the end user installation. Pressing
the Display Refresh button invokes a search procedure (see
Figure 74). A new R7910A Hydronic Control or R7911 Steam
Control is identied by “Unknown” status next to its name in
the boiler system list (see Figure 75). “Unknown” indicates that
conguration data has not been retrieved from the control yet.
FIGURE 72. DIAGNOSTICS PAGE (DIGITAL I/O)
The control analog I/O can also be viewed on the OI Display. A
snapshot of the diagnostic status is displayed and updated as it
changes in the control.
The analog I/O data is displayed as bar charts with I/O level
represented in the I/O range (see Figure 73) Analog I/O that is
not enabled for the installation displays a blank I/O level. Not all
analog I/O can be displayed at the same time on the page, so
a horizontal scroll bar is used to move the view left and right to
show all analog I/O status.
FIGURE 74. SYSTEM REFRESH
FIGURE 75. SYSTEM CONFIGURATION PAGE
The control connected to the Modbus network is indicated to the
user after the search procedure has concluded.
Once the control is located it must be synchronized with the OI
Display before it can be displayed. New controls are not displayed
on the Home page until this synchronization is performed.
FIGURE 73. DIAGNOSTIC PAGE (ANALOG I/O)
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SYSTEM SYNCHRONIZATION (S7999B OI DISPLAY ONLY)
The user can manually synchronize conguration data from the
connected controls at any time.
A new control is visible when conguration and status data is
gathered from it. This collection procedure takes a few minutes.
The control is marked as “Unknown” when no conguration
information exists. Normally, control conguration data collection
only needs to be performed when the control is initially installed.
However, a re synchronization is necessary after the OI Display
is reset. See Figure 76.
The user presses the Synchronize button to begin synchronization
with the control. See Figure 76.
FIGURE 76. SYSTEM SYNCHRONIZATION
Status of the synchronization is reected in the dialog box. The
synchronization can be aborted by selecting the Cancel button.
CONFIGURATION
The Burner Control can be congured from the OI Display. The
control conguration is grouped into the functional groups as
shown in Table 23.
TABLE 23. FUNCTIONAL CONFIGURATION GROUPS
HYDRONIC CONTROL
System Identication and
Access
CH - Central Heat
Outdoor Reset
DHW - Domestic Hot Water
DHW Storage
DHW Plate
Warm Weather Shutdown
Demand Priority
Modulation Conguration
Pump Conguration
Statistics Conguration
High Limit
Stack Limit
Delta T Limits
T-Rise Limit
Heat Exchanger High Limit
Anti-condensation
Frost Protection Conguration
Annunciation Conguration
Burner Control Interlocks
Burner Control Timings and Rates
Burner Control Ignition
Burner Control Flame Failure
System Conguration
Fan Conguration
Sensor Conguration
Lead Lag Slave Conguration
Lead Lag Master Conguration
Most of this conguration is performed by the Service Agent
or at A.O. Smith. Each functional group is displayed on the
Conguration menu page.
Parameters in functional groups that are not applicable for
the installation can be ignored. In some cases, features in a
functional group are disabled by default and are enabled when
needed for the installation.
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TROUBLESHOOTING
To support the recommended Troubleshooting, the R7910 has an Alert File. Review the Alert history for possible trends that may have
been occurring prior to the actual Lockout.
Note Column: H= Hold message; L=Lockout message; H or L= either Hold or Lockout depending on Parameter Conguration.
TABLE 24. TROUBLESHOOTING CODES
CODE DESCRIPTION RECOMMENDED TROUBLESHOOTING OF
NOTE
LOCKOUT CODES
Safety Data Faults
1 Uncongured safety data 1. New Device, complete device conguration and
safety verication.
2. If fault repeats, replace module.
2 Waiting for safety data verication 1. Device in Conguration mode and safety
parameters need verication and a device needs
reset to complete verication.
2. Conguration ended without verication, re enter
conguration, verify safety parameters and reset
device to complete verication.
3. If fault repeats, replace module.
Internal Operation Errors
3 Internal fault: Hardware fault Internal Fault.
4 Internal fault: Safety Relay key feedback error H
5 Internal fault: Unstable power (DCDC) output H
6 Internal fault: Invalid processor clock H
7 Internal fault: Safety relay drive error H
8 Internal fault: Zero crossing not detected H
9 Internal fault: Flame bias out of range H
10 Internal fault: Invalid Burner control state L
11 Internal fault: Invalid Burner control state ag L
12 Internal fault: Safety relay drive cap short H
13 Internal fault: PII shorted to ILK H or L
14 Internal fault: HFS shorted to LCI H or L
15 Internal fault: Safety relay test failed due to
feedback ON
16 Internal fault: Safety relay test failed due to safety
relay OFF
17 Internal fault: Safety relay test failed due to safety
relay not OFF
18 Internal fault: Safety relay test failed due to
feedback not ON
19 Internal fault: Safety RAM write L
20 Internal fault: Flame ripple and overow H
21 Internal fault: Flame number of sample mismatch H
22 Internal fault: Flame bias out of range H
23 Internal fault: Bias changed since heating cycle
starts
24 Internal fault: Spark voltage stuck low or high H
25 Internal fault: Spark voltage changed too much
during ame sensing time
26 Internal fault: Static ame ripple H
27 Internal fault: Flame rod shorted to ground
detected
28 Internal fault: A/D linearity test fails H
29 Internal fault: Flame bias cannot be set in range H
1. Reset Module.
2. If fault repeats, replace module.
61
L
L
H
L
L
L
L
H
H
H
Page 62
CODE DESCRIPTION RECOMMENDED TROUBLESHOOTING OF
NOTE
LOCKOUT CODES
30 Internal fault: Flame bias shorted to adjacent pin Internal Fault.
31 Internal fault: SLO electronics unknown error H
32 - 46 Internal fault: Safety Key 0 through 14 L
System Errors
47 Flame Rod to ground leakage H
48 Static ame (not ickering) H
49 24 VAC voltage low/high 1. Check the Module and display connections.
50 Modulation fault Internal sub-system fault.
51 Pump fault H
52 Motor tachometer fault H
53 AC inputs phase reversed 1. Check the Module and display connections.
54 Safety GVT model ID does not match application's
model ID
55 Application conguration data block CRC errors Contact the service professional. L
56 - 57 RESERVED
58 Internal fault: HFS shorted to IAS Internal Fault.
59 Internal Fault: Mux pin shorted L
Normal Event Status
60 Internal Fault: HFS shorted to LFS L
61 Anti short cycle Will not be a lockout fault. Hold Only. H
62 Fan speed not proved H
63 LCI OFF 1. Check wiring and correct any faults.
64 PII OFF 1. Check wiring and correct any faults.
65 Interrupted Airow Switch OFF 1. Check wiring and correct any possible shorts.
66 Interrupted Airow Switch ON H or L
1. Reset Module.
2. If fault repeats, replace module.
2. Check the Module power supply and make sure
that both frequency, voltage and VA meet the
specications.
1. Review alert messages for possible trends.
2. Correct possible problems.
3. If fault persists, replace module.
2. Check the Module power supply and make
sure that both frequency and voltage meet the
specications.
3. On 24 VAC applications, assure that J4-10 and
J8-2 are connected together.
Contact the service professional. L
1. Reset Module.
2. If fault repeats, replace module.
2. Check Interlocks connected to the LCI to assure
proper function.
3. Reset and sequence the module; monitor the LCI
status.
4. If code persists, replace the module.
2. Check Preignition Interlock switches to assure
proper functioning.
3. Check the valve operation.
4. Reset and sequence the module; monitor the PII
status.
5. If code persists, replace the module.
2. Check airow switches to assure proper
functioning.
3. Check the fan/blower operation.
4. Reset and sequence the module; monitor the
airow status.
5. If code persists, replace the module.
H
H
H
L
L
H
H or L
H or L
62
Page 63
CODE DESCRIPTION RECOMMENDED TROUBLESHOOTING OF
NOTE
LOCKOUT CODES
67 ILK OFF 1. Check wiring and correct any possible shorts.
68 ILK ON H or L
69 Pilot test hold 1. Verify Run/Test is changed to Run.
70 Wait for leakage test completion 1. Internal Fault. Reset Module.
71 - 77 RESERVED
78 Demand Lost in Run 1. Check wiring and correct any possible errors.
79 Outlet high limit 1. Check wiring and correct any possible errors.
80 DHW high limit 1. Check wiring and correct any possible errors.
81 Delta T limit 1. Check Inlet and Outlet sensors and pump circuits
82 Stack limit 1. Check wiring and correct any possible errors.
83 Delta T exchanger/outlet limit Not Applicable. H or L
84 Delta T inlet/exchanger limit Not Applicable. H or L
85 Inlet/outlet inversion limit Not Applicable. H or L
86 Exchanger/outlet inversion limit Not Applicable. H or L
87 Inlet/exchanger inversion limit Not Applicable. H or L
88 Outlet T-rise limit Check for adequate ow. H or L
89 Exchanger T-rise limit Not Applicable. H or L
90 Heat exchanger high limit Not Applicable. H or L
Sensor Faults
91 Inlet sensor fault 1. Check wiring and correct any possible errors.
92 Outlet sensor fault 1. Check wiring and correct any possible errors.
93 DHW sensor fault 1. Check wiring and correct any possible errors.
2. Check Interlock (ILK) switches to assure proper
function.
3. Verify voltage through the interlock string to the
interlock input with a voltmeter.
4. If steps 1-3 are correct and the fault persists,
replace the module.
2. Reset Module.
3. If fault repeats, replace module.
2. If fault repeats, replace module.
2. If previous steps are correct and fault persists,
replace the module.
2. Replace the Outlet high limit.
3. If previous steps are correct and fault persists,
replace the module.
2. Replace the DHW high limit.
3. If previous steps are correct and fault persists,
replace the module.
for proper operation.
2. Recheck the Delta T Limit to conrm proper
setting.
3. If previous steps are correct and fault persists,
replace the module.
2. Replace the Stack high limit.
3. If previous steps are correct and fault persists,
replace the module.
2. Replace the Inlet sensor.
3. If previous steps are correct and fault persists,
replace the module.
2. Replace the Outlet sensor.
3. If previous steps are correct and fault persists,
replace the module.
2. Replace the DHW sensor.
3. If previous steps are correct and fault persists,
replace the module.
H or L
H
H
H
H or L
H or L
H or L
H or L
H
H
H
63
Page 64
CODE DESCRIPTION RECOMMENDED TROUBLESHOOTING OF
LOCKOUT CODES
94 Header sensor fault 1. Check wiring and correct any possible errors.
2. Replace the header sensor.
3. If previous steps are correct and fault persists,
replace the module.
95 Stack sensor fault 1. Check wiring and correct any possible errors.
2. Replace the stack sensor.
3. If previous steps are correct and fault persists,
replace the module.
96 Outdoor sensor fault 1. Check wiring and correct any possible errors.
2. Replace the outdoor sensor.
3. If previous steps are correct and fault persists,
replace the module.
97 Internal Fault: A2D mismatch. Internal Fault.
98 Internal Fault: Exceeded VSNSR voltage L
99 Internal Fault: Exceeded 28V voltage tolerance L
100 Pressure Sensor Fault 1. Verify the Pressure Sensor is a 4-20 ma source.
101-104 RESERVED
Flame Operation Faults
105 Flame detected out of sequence 1. Check that ame is not present in the combustion
106 Flame lost in MFEP 1. Check pilot valve (Main Valve for DSI) wiring and
107 Flame lost early in run L
108 Flame lost in run L
109 Ignition failed L
110 Ignition failure occurred Hold time of recycle and hold option. Will not be a
111 Flame current lower than WEAK threshold Internal hardware test. Not a lockout, H
112 Pilot test ame timeout Interrupted Pilot or DSI application and ame lost
113 Flame circuit timeout Flame sensed during Initiate or off cycle, hold 240
114-121 RESERVED
Rate Proving Faults
122 Lightoff rate proving failed 1. Check wiring and correct any potential wiring
123 Purge rate proving failed L
1. Reset Module.
2. If fault repeats, replace module.
2. Check wiring and correct any possible errors.
3. Test Pressure Sensor for correct operation.
4. Replace the Pressure sensor.
5. If previous steps are correct and fault persists,
replace the module.
chamber. Correct any errors.
2. Make sure that the ame detector is wired to the
correct terminal.
3. Make sure the F & G wires are protected from
stray noise pickup.
4. Reset and sequence the module, if code
reappears, replace the ame detector.
5. Reset and sequence the module, if code
reappears, replace the module.
operation - correct any errors.
2. Check the fuel supply.
3. Check fuel pressure and repeat turndown tests.
4. Check ignition transformer electrode, ame
detector, ame detector siting or ame rod
position.
5. If steps 1 through 4 are correct and the fault
persists, replace the module.
lockout fault. Hold Only.
when system in “test” mode.
1. Reset the module to restart.
seconds, if present after 240 seconds, lockout.
errors.
2. Check VFDs ability to change speeds.
3. Change the VFD
4. If the fault persists, replace the module.
NOTE
H
H
H
L
H
H or L
L
H
L
L
L
64
Page 65
CODE DESCRIPTION RECOMMENDED TROUBLESHOOTING OF
NOTE
LOCKOUT CODES
124 High re switch OFF 1. Check wiring and correct any potential wiring
125 High re switch stuck ON H
126 Low re switch OFF 1. Check wiring and correct any potential wiring
127 Low re switch stuck ON H or L
128 Fan speed failed during prepurge 1. Check wiring and correct any potential wiring
129 Fan speed failed during preignition H or L
130 Fan speed failed during ignition H or L
131 Fan movement detected during standby H
132 Fan speed failed during run H
133-135 RESERVED
Start Check Faults
136 Interrupted Airow Switch failed to close 1. Check wiring and correct any possible wiring
137 ILK failed to close 1. Check wiring and correct any possible shorts.
138-142 RESERVED
FAULT CODES 149 THROUGH 165 ARE
OEM SPECIFIC FAULT CODES.
143 Internal fault: Flame bias out of range 1 Contact the service professional. L
144 Internal fault: Flame bias out of range 2 Contact the service professional. L
145 Internal fault: Flame bias out of range 3 Contact the service professional. L
146 Internal fault: Flame bias out of range 4 Contact the service professional. L
147 Internal fault: Flame bias out of range 5 Contact the service professional. L
148 Internal fault: Flame bias out of range 6 Contact the service professional. L
149 Flame detected OEM Specic
errors.
2. Check High Fire Switch to assure proper function
(not welded or jumpered).
3. Manually drive the motor to the High Fire position
and adjust the HF switch while in this position
and verify voltage through the switch to the HFS
input with a voltmeter.
4. If steps 1-3 are correct and the fault persists,
replace the module.
errors.
2. Check Low Fire Switch to assure proper function
(not welded or jumpered).
3. Manually drive the motor to the High Fire position
and adjust the LF switch while in this position and
verify voltage through the switch to the LFS input
with a voltmeter.
4. If steps 1-3 are correct and the fault persists,
replace the module.
errors.
2. Check VFDs ability to change speeds.
3. Change the VFD
4. If the fault persists, replace the module.
errors.
2. Check Interrupted Airow switch(es) to assure
proper function.
3. Verify voltage through the airow switch to the
IAS input with a voltmeter.
4. If steps 1-3 are correct and the fault persists,
replace the module.
2. Check Interlock (ILK) switches to assure proper
function.
3. Verify voltage through the interlock string to the
interlock input with a voltmeter.
4. If steps 1-3 are correct and the fault persists,
replace the module.
1. Holds if ame detected during Safe Start check
up to Flame Establishing period.
H
H
H or L
H
H
H or L
65
Page 66
CODE DESCRIPTION RECOMMENDED TROUBLESHOOTING OF
NOTE
LOCKOUT CODES
150 Flame not detected OEM Specic
1. Sequence returns to standby and restarts
sequence at the beginning of Purge after the HF
switch opens. If ame detected during Safe Start
check up to Flame Establishing period.
151 High re switch ON OEM Specic
1. Check wiring and correct any potential wiring
errors.
2. Check High Fire Switch to assure proper function
(not welded or jumpered).
3. Manually drive the motor to the High Fire position
and adjust the HF switch while in this position
and verify voltage through the switch to the HFS
input with a voltmeter.
4. If steps 1-3 are correct and the fault persists,
replace the module.
152 Combustion pressure ON OEM Specic
153 Combustion pressure Off H or L
154 Purge Fan switch On OEM Specic
155 Purge Fan switch Off H
156 Combustion pressure and Flame ON OEM Specic
157 Combustion pressure and Flame OFF L
158 Main valve ON OEM Specic
159 Main valve OFF L
160 Ignition ON OEM Specic
161 Ignition OFF L
162 Pilot valve ON OEM Specic
163 Pilot valve OFF L
1. Check wiring and correct any errors.
2. Inspect the Combustion Pressure Switch to make
sure it is working correctly.
3. Reset and sequence the relay module.
4. During STANDBY and PREPURGE, measure
the voltage between Terminal J6-5 and L2 (N).
Supply voltage should be present. If not, the
lockout switch is defective and needs replacing.
5. If the fault persists, replace the relay module.
1. Purge fan switch is on when it should be off.
1. Check that ame is not present in the combustion
chamber. Correct any errors.
2. Make sure that the ame detector is wired to the
correct terminal.
3. Make sure the F & G wires are protected from
stray noise pickup.
4. Reset and sequence the module, if code
reappears, replace the ame detector.
1. Check Main Valve terminal wiring and correct any
errors.
2. Reset and sequence the module. If fault persist,
replace the module.
1. Check Ignition terminal wiring and correct any
errors.
2. Reset and sequence the module. If fault persist,
replace the module.
1. Check Pilot Valve terminal wiring and correct any
errors.
2. Reset and sequence the module. If fault persist,
replace the module.
H
H or L
H or L
H or L
H or L
L
L
L
66
Page 67
CODE DESCRIPTION RECOMMENDED TROUBLESHOOTING OF
LOCKOUT CODES
164 Block intake ON OEM Specic
165 Block intake OFF L
166-171 RESERVED
Feedback
172 Main relay feedback incorrect Internal Fault.
173 Pilot relay feedback incorrect L
174 Safety relay feedback incorrect L
175 Safety relay open L
176 Main relay ON at safe start check L
177 Pilot relay ON at safe start check L
178 Safety relay ON at safe start check L
179-183 RESERVED
Parameter Faults
184 Invalid BLOWER/HSI output setting 1. Return to Conguration mode and recheck
185 Invalid Delta T limit enable setting L
186 Invalid Delta T limit response setting L
187 Invalid DHW high limit enable setting L
188 Invalid DHW high limit response setting L
189 Invalid Flame sensor type setting L
190 Invalid interrupted air switch enable setting L
191 Invalid interrupted air switch start check enable
setting
192 Invalid igniter on during setting L
193 Invalid ignite failure delay setting L
194 Invalid ignite failure response setting 1. Return to Conguration mode and recheck
195 Invalid ignite failure retries setting L
196 Invalid ignition source setting L
197 Invalid interlock open response setting L
198 Invalid interlock start check setting L
199 Invalid LCI enable setting L
200 Invalid lightoff rate setting L
201 Invalid lightoff rate proving setting L
202 Invalid Main Flame Establishing Period time L
203 Invalid MFEP ame failure response setting L
204 Invalid NTC sensor type setting L
205 Invalid Outlet high limit response setting L
206 Invalid Pilot Flame Establishing Period setting L
207 Invalid PII enable setting L
208 Invalid pilot test hold setting L
209 Invalid Pilot type setting L
210 Invalid Postpurge time setting L
211 Invalid Power up with lockout setting L
1. Check wiring and correct any errors.
2. Inspect the Block Intake Switch to make sure it is
working correctly.
3. Reset and sequence the module.
4. During Standby and Purge, measure the voltage
across the switch. Supply voltage should
be present. If not, the Block Intake Switch is
defective and needs replacing.
5. If the fault persists, replace the relay module.
1. Reset Module.
2. If fault repeats, replace module.
selected parameters, reverify and reset module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.
selected parameters, reverify and reset module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.
NOTE
L
L
L
L
L
67
Page 68
CODE DESCRIPTION RECOMMENDED TROUBLESHOOTING OF
LOCKOUT CODES
212 Invalid Preignition time setting 1. Return to Conguration mode and recheck
213 Invalid Prepurge rate setting L
214 Invalid Prepurge time setting L
215 Invalid Purge rate proving setting L
216 Invalid Run ame failure response setting L
217 Invalid Run stabilization time setting L
218 Invalid Stack limit enable setting L
219 Invalid Stack limit response setting L
220 Uncongured Delta T limit setpoint setting L
221 Uncongured DHW high limit setpoint setting L
222 Uncongured Outlet high limit setpoint setting L
223 Uncongured Stack limit setpoint setting L
224 Invalid DHW demand source setting L
225 Invalid Flame threshold setting L
226 Invalid Outlet high limit setpoint setting L
227 Invalid DHW high limit setpoint setting L
228 Invalid Stack limit setpoint setting L
229 Invalid Modulation output setting L
230 Invalid CH demand source setting L
231 Invalid Delta T limit delay setting L
232 Invalid Pressure sensor type setting L
233 Invalid IAS closed response setting L
234 Invalid Outlet high limit enable setting Contact the service professional. L
235 Invalid Outlet connector type setting Contact the service professional. L
236 Invalid Inlet connector type setting Contact the service professional. L
237 Invalid DHW connector type setting Contact the service professional. L
238 Invalid Stack connector type setting Contact the service professional. L
239 Invalid S2 (J8-6) connector type setting Contact the service professional. L
240 Invalid S5 (J8-11) connector type setting Contact the service professional. L
241 Exchanger sensor not allowed with stack
connector setting
242 Invalid DHW auto detect conguration Not Applicable. L
243 Invalid UV with spark interference not compatible
with Ignitor on throughout PFEP
244 Internal fault: Safety relay test invalid state Contact the service professional. L
245 Invalid Outlet connector type setting for Trise Contact the service professional. L
246 4-20mA cannot be used for both modulation and
setpoint control
247 Invalid ILK bounce detection enable Not Applicable. L
248 Invalid forced recycle interval Not Applicable. L
249 STAT cannot be demand source when Remote
Stat is enabled
250 Invalid Fan speed error response 1. Check fan cables secured properly. If fault
251-255 RESERVED
selected parameters, reverify and reset module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.
Not Applicable. L
Contact the service professional. L
Contact the service professional. L
Not Applicable. L
persists contact the service professional.
NOTE
L
L
68
Page 69
TABLE 25. ALERTS
CODE DESCRIPTION
EE Management Faults
0 None (No alert)
1 Alert PCB was restored from factory defaults
2 Safety conguration parameters were restored
from factory defaults
3 Conguration parameters were restored from
factory defaults
4 Invalid Factory Invisibility PCB was detected
5 Invalid Factory Range PCB was detected
6 Invalid range PCB record has been dropped
7 EEPROM lockout history was initialized
8 Switched application annunciation data blocks
9 Switched application conguration data blocks
10 Conguration was restored from factory defaults
11 Backup conguration settings was restored from
active conguration
12 Annunciation conguration was restored from
factory defaults
13 Annunciation conguration was restored from
backup
14 Safety group verication table was restored from
factory defaults
15 Safety group verication table was updated
16 Invalid Parameter PCB was detected
17 Invalid Range PCB was detected
System Parameter Errors
18 Alarm silence time exceeded maximum
19 Invalid safety group verication table was detected
20 Backdoor Password could not be determined
21 Invalid safety group verication table was not
accepted
22 CRC errors were found in application conguration
data blocks
23 Backup Alert PCB was restored from active one
24 RESERVED
25 Lead Lag operation switch was turned OFF
26 Lead Lag operation switch was turned ON
27 Safety processor was reset
28 Application processor was reset
29 Burner switch was turned OFF
30 Burner switch was turned ON
31 Program Module (PM) was inserted into socket
32 Program Module (PM) was removed from socket
33 Alert PCB was congured
34 Parameter PCB was congured
35 Range PCB was congured
36 Program Module (PM) incompatible with product
was inserted into socket
CODE DESCRIPTION
37 Program Module application parameter revision
differs from application processor
38 Program Module safety parameter revision differs
from safety processor
39 PCB incompatible with product contained in
Program Module
40 Parameter PCB in Program Module is too large for
product
41 Range PCB in Program Module was too large for
product
42 Alert PCB in Program Module was too large for
product
43 IAS start check was forced on due to IAS enabled
System Operation Faults
44 Low voltage was detected in safety processor
45 High line frequency occurred
46 Low line frequency occurred
47 Invalid subsystem reset request occurred
48 Write large enumerated Modbus register value
was not allowed
49 Maximum cycle count was reached
50 Maximum hours count was reached
51 Illegal Modbus write was attempted
52 Modbus write attempt was rejected (NOT
ALLOWED)
53 Illegal Modbus read was attempted
54 Safety processor brown-out reset occurred
55 Application processor watchdog reset occurred
56 Application processor brown-out reset occurred
57 Safety processor watchdog reset occurred
58 Alarm was reset by the user at the control
Demand/Rate Command Faults
59 Burner control ring rate was > absolute max rate
60 Burner control ring rate was < absolute min rate
61 Burner control ring rate was invalid, % vs. RPM
62 Burner control was ring with no fan request
63 Burner control rate (nonring) was > absolute max
rate
64 Burner control rate (nonring) was < absolute min
rate
65 Burner control rate (nonring) was absent
66 Burner control rate (nonring) was invalid, %
vs.RPM
67 Fan off cycle rate was invalid, % vs. RPM
68 Setpoint was overridden due to sensor fault
69 Modulation was overridden due to sensor fault
70 No demand source was set due to demand priority
conicts
71-73 RESERVED
69
Page 70
CODE DESCRIPTION
Fan Parameter Errors
74 Periodic Forced Recycle
75 Absolute max fan speed was out of range
76 Absolute min fan speed was out of range
77 Fan gain down was invalid
78 Fan gain up was invalid
79 Fan minimum duty cycle was invalid
80 Fan pulses per revolution was invalid
81 Fan PWM frequency was invalid
82-83 RESERVED
Modulation Parameter Errors
84 Lead Lag CH 4-20 mA water temperature setting
85 No Lead Lag add stage error threshold was
congured
86 No Lead Lag add stage detection time was
congured
87 No Lead Lag drop stage error threshold was
congured
88 No Lead Lag drop stage detection time was
congured
89 RESERVED
90 Modulation output type was invalid
91 Firing rate control parameter was invalid
92 Forced rate was out of range vs. min/max
modulation
93 Forced rate was invalid, % vs. RPM
94 Slow start ramp value was invalid
95 Slow start degrees value was invalid
96 Slow start was ended due to outlet sensor fault
97 Slow start was end due to reference setpoint fault
98 CH max modulation rate was invalid, % vs. RPM
99 CH max modulation rate was > absolute max rate
100 CH modulation range (max minus min) was too
small (< 4% or 40 RPM)
101 DHW max modulation rate was invalid, % vs.RPM
102 DHW max modulation rate was > absolute max
rate
103 DHW modulation range (max minus min) was too
small (< 4% or 40 RPM)
104 Min modulation rate was < absolute min rate
105 Min modulation rate was invalid, % vs. RPM
106 Manual rate was invalid, % vs. RPM
107 Slow start enabled, but forced rate was invalid
108 Analog output hysteresis was invalid
109 Analog modulation output type was invalid
110 IAS open rate differential was invalid
111 IAS open step rate was invalid
112 MIX max modulation rate was invalid, % vs. RPM
113 MIX max modulation rate was >absolute max or <
absolute min rates
CODE DESCRIPTION
114 MIX modulation range (max minus min) was too
small (< 4% or 40 RPM)
Modulation Operation Faults
115 Fan was limited to its minimum duty cycle
116 Manual rate was > CH max modulation rate
117 Manual rate was > DHW max modulation rate
118 Manual rate was < min modulation rate
119 Manual rate in Standby was > absolute max rate
120 Modulation commanded rate was > CH max
modulation rate
121 Modulation commanded rate was > DHW max
modulation rate
122 Modulation commanded rate was < min
modulation rate
123 Modulation rate was limited due to outlet limit
124 Modulation rate was limited due to Delta-T limit
125 Modulation rate was limited due to stack limit
126 Modulation rate was limited due to
anticondensation
127 Fan Speed out of range in RUN
128 Modulation rate was limited due to IAS was open
129 Slow start ramp setting of zero will result in no
modulation rate change
130 No forced rate was congured for slow start ramp
CH parameter Errors
131 CH demand source was invalid
132 CH P-gain was invalid
133 CH I-gain was invalid
134 CH D-gain was invalid
135 CH OFF hysteresis was invalid
136 CH ON hysteresis was invalid
137 CH sensor type was invalid
138 CH hysteresis step time was invalid
139 CH remote control parameter was invalid
140 CH ODR not allowed with remote control
141 Steam P-gain was invalid
142 Steam I-gain was invalid
143 Steam D-gain was invalid
144 Steam OFF hysteresis was invalid
145 Steam ON hysteresis was invalid
CH Operation Faults
146 CH control was suspended due to fault
147 CH header temperature was invalid
148 CH outlet temperature was invalid
149 CH steam pressure was invalid
CH Parameter errors (continued)
150 Steam setpoint source parameter was invalid
151 Minimum water temperature parameter was
greater than setpoint
70
Page 71
CODE DESCRIPTION
152 Minimum water temperature parameter was
greater than time of day setpoint
153 Minimum pressure parameter was greater than
setpoint
154 Minimum pressure parameter was greater than
time of day setpoint
155 CH modulation rate source parameter was invalid
156 Steam modulation rate source parameter was
invalid
DHW Parameter Errors
157 DHW demand source was invalid
158 DHW P-gain was invalid
159 DHW I-gain was invalid
160 DHW D-gain was invalid
161 DHW OFF hysteresis was invalid
162 DHW ON hysteresis was invalid
163 DHW hysteresis step time was invalid
164 DHW sensor type was invalid
165 Inlet sensor type was invalid for DHW
166 Outlet sensor type was invalid for DHW
167 DHW Storage OFF hysteresis was invalid
168 DHW Storage ON hysteresis was invalid
169 DHW modulation sensor type was invalid
170 DHW modulation sensor was not compatible for
AUTO mode
DHW Operation Faults
171 DHW control was suspended due to fault
172 DHW temperature was invalid
173 DHW inlet temperature was invalid
174 DHW outlet temperature was invalid
175 DHW high limit must be disabled for AUTO mode
176 DHW sensor type was not compatible for AUTO
mode
177 DHW priority source setting was invalid
178 DHW priority method setting was invalid
CH Operation Faults (continued)
179 CH S5 (J8 terminal 11) sensor was invalid
180 CH inlet temperature was invalid
181 CH S10 (J10 terminal 7) sensor was invalid
182 Lead Lag CH setpoint source was invalid
Lead Lag Parameter errors
183 Lead Lag P-gain was invalid
184 Lead Lag I-gain was invalid
185 Lead Lag D-gain was invalid
186 Lead Lag OFF hysteresis was invalid
187 Lead Lag ON hysteresis was invalid
188 Lead Lag slave enable was invalid
189 Lead Lag hysteresis step time was invalid
190 No Lead lag Modbus port was assigned
CODE DESCRIPTION
191 Lead Lag base load common setting was invalid
192 Lead Lag DHW demand switch setting was
193 Lead Lag Mix demand switch setting was invalid
194 Lead Lag modulation sensor setting was invalid
195 Lead Lag backup modulation sensor setting was
invalid
196 Lead Lag slave mode setting was invalid
197 Lead Lag rate allocation setting was invalid
198 Lead selection setting was invalid
199 Lag selection setting was invalid
200 Lead Lag slave return setting was invalid
201 Lead Lag add stage method setting was invalid
202 STAT may not be a Lead Lag CH demand source
when Remote Stat is enabled
203 Lead Lag base load rate setting was invalid
Lead Lag Operation Faults
204 Lead Lag master was suspended due to fault
205 Lead Lag slave was suspended due to fault
206 Lead Lag header temperature was invalid
207 Lead Lag was suspended due to no enabled
Program Module installed
208 Lead Lag slave session has timed out
209 Too many Lead Lag slaves were detected
210 Lead Lag slave was discovered
211 Incompatible Lead Lag slave was discovered
212 No base load rate was set for Lead Lag slave
213 Lead Lag slave unable to re before demand to
re delay expired
214 Adding Lead Lag slave aborted due to add
requirement change
215 No Lead Lag slaves available to service demand
216 No Lead Lag active service was set due to
demand priority conicts
217 No Lead Lag add stage method was specied
218 No Lead Lag drop stage method was specied
219 Using backup lead lag header sensor due to
sensor failure
Frost Protection Faults
220 Lead Lag frost protection rate was invalid
221 Lead Lag drop stage method setting was invalid
222 CH frost protection temperature was invalid
223 CH frost protection inlet temperature was invalid
224 DHW frost protection temperature was invalid
225-226 RESERVED
227 DHW priority override time was not derated due to
invalid outdoor temperature
228 Warm weather shutdown was not checked due to
invalid outdoor temperature
229 Lead Lag slave communication timeout
230 RESERVED
71
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CODE DESCRIPTION
231 Lead Lag CH setpoint was invalid
232 Lead Lag CH time of day setpoint was invalid
233 LL outdoor temperature was invalid
234 Lead Lag ODR time of day setpoint was invalid
235 Lead Lag ODR time of day setpoint exceeded
normal setpoint
236 Lead Lag ODR max outdoor temperature was
invalid
237 Lead Lag ODR min outdoor temperature was
invalid
238 Lead Lag ODR low water temperature was invalid
239 Lead Lag ODR outdoor temperature range was
too small (minimum 12°C / 22°F)
240 Lead Lag ODR water temperature range was too
small (minimum 12°C / 22°F)
241 Lead Lag DHW setpoint was invalid
242 Lead Lag Mix setpoint was invalid
243 Lead Lag CH demand switch was invalid
244 Lead Lag CH setpoint source was invalid
245 RESERVED
246 CH setpoint was invalid
247 CH time of day setpoint was invalid
248 CH outdoor temperature was invalid
249 CH ODR time of day setpoint was invalid
250 CH ODR time of day setpoint exceeds normal
setpoint
251 CH max outdoor setpoint was invalid
252 CH min outdoor setpoint was invalid
253 CH min water setpoint was invalid
254 CH outdoor temperature range was too small
255 CH water temperature range was too small
256 Steam setpoint was invalid
257 Steam time of day setpoint was invalid
258 Steam minimum pressure was invalid
259 CH ODR min water temperature was invalid
260 RESERVED
261 DHW setpoint was invalid
262 DHW time of day setpoint was invalid
263 DHW storage setpoint was invalid
264 STAT may not be a DHW demand source when
Remote Stat is enabled
265-266 RESERVED
267 STAT may not be a CH demand source when
Remote Stat is enabled
268 CH 4mA water temperature setting was invalid
269 CH 20mA water temperature setting was invalid
270 Steam 4mA water temperature setting was invalid
271 Steam 20mA water temperature setting was invalid
272 Abnormal Recycle: Pressure sensor fault
273 Abnormal Recycle: Safety relay drive test failed
CODE DESCRIPTION
274 Abnormal Recycle: Demand off during Pilot Flame
Establishing Period
275 Abnormal Recycle: LCI off during Drive to Purge
Rate
276 Abnormal Recycle: LCI off during Measured Purge
Time
277 Abnormal Recycle: LCI off during Drive to Lightoff
Rate
278 Abnormal Recycle: LCI off during Pre-Ignition test
279 Abnormal Recycle: LCI off during Pre-Ignition time
280 Abnormal Recycle: LCI off during Main Flame
Establishing Period
281 Abnormal Recycle: LCI off during Ignition period
282 Abnormal Recycle: Demand off during Drive to
Purge Rate
283 Abnormal Recycle: Demand off during Measured
Purge Time
284 Abnormal Recycle: Demand off during Drive to
Lightoff Rate
285 Abnormal Recycle: Demand off during Pre-Ignition
test
286 Abnormal Recycle: Demand off during Pre-Ignition
time
287 Abnormal Recycle: Flame was on during Safe
Check
288 Abnormal Recycle: Flame was on during Drive to
Purge Rate
289 Abnormal Recycle: Flame was on during
Measured Purge Time
290 Abnormal Recycle: Flame was on during Drive to
Lightoff Rate
291 Abnormal Recycle: Flame was not on at end of
Ignition period
292 Abnormal Recycle: Flame was lost during Main
Flame Establishing Period
293 Abnormal Recycle: Flame was lost early in Run
294 Abnormal Recycle: Flame was lost during Run
295 Abnormal Recycle: Leakage test failed
296 Abnormal Recycle: Interrupted air ow switch was
off during Drive to Purge Rate
297 Abnormal Recycle: Interrupted air ow switch was
off during Measured Purge Time
298 Abnormal Recycle: Interrupted air ow switch was
off during Drive to Lightoff Rate
299 Abnormal Recycle: Interrupted air ow switch was
off during Pre-Ignition test
300 Abnormal Recycle: Interrupted air ow switch was
off during Pre-Ignition time
301 Abnormal Recycle: Interrupted air ow switch was
off during Main Flame Establishing Period
302 Abnormal Recycle: Ignition failed due to
interrupted air ow switch was off
303 Abnormal Recycle: ILK off during Drive to Purge
Rate
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CODE DESCRIPTION
304 Abnormal Recycle: ILK off during Measured Purge
Time
305 Abnormal Recycle: ILK off during Drive to Lightoff
Rate
306 Abnormal Recycle: ILK off during Pre-Ignition test
307 Abnormal Recycle: ILK off during Pre-Ignition time
308 Abnormal Recycle: ILK off during Main Flame
Establishing Period
309 Abnormal Recycle: ILK off during Ignition period
310 Run was terminated due to ILK was off
311 Run was terminated due to interrupted air ow
switch was off
312 Stuck reset switch
313 Run was terminated due to fan failure
314 Abnormal Recycle: Fan failed during Drive to
Purge Rate
315 Abnormal Recycle: Fan failed during Measured
Purge Time
316 Abnormal Recycle: Fan failed during Drive to
Lightoff Rate
317 Abnormal Recycle: Fan failed during Pre-Ignition
test
318 Abnormal Recycle: Fan failed during Pre-Ignition
time
319 Abnormal Recycle: Fan failed during Ignition
period
320 Abnormal Recycle: Fan failed during Main Flame
Establishing Period
321 Abnormal Recycle: Main Valve off after 10
seconds of RUN
322 Abnormal Recycle: Pilot Valve off after 10 seconds
of RUN
323 Abnormal Recycle: Safety Relay off after 10
seconds of RUN
324 Abnormal Recycle: Hardware ame bias
325 Abnormal Recycle: Hardware static ame
326 Abnormal Recycle: Hardware ame current invalid
327 Abnormal Recycle: Hardware ame rod short
328 Abnormal Recycle: Hardware invalid power
329 Abnormal Recycle: Hardware invalid AC line
330 Abnormal Recycle: Hardware SLO ame ripple
330 Abnormal Recycle: Hardware SLO ame sample
332 Abnormal Recycle: Hardware SLO ame bias
range
333 Abnormal Recycle: Hardware SLO ame bias heat
334 Abnormal Recycle: Hardware SLO spark stuck
335 Abnormal Recycle: Hardware SLO spark changed
336 Abnormal Recycle: Hardware SLO static ame
337 Abnormal Recycle: Hardware SLO rod shorted
338 Abnormal Recycle: Hardware SLO AD linearity
339 Abnormal Recycle: Hardware SLO bias not set
340 Abnormal Recycle: Hardware SLO bias shorted
CODE DESCRIPTION
341 Abnormal Recycle: Hardware SLO electronics
342 Abnormal Recycle: Hardware processor clock
343 Abnormal Recycle: Hardware AC phase
344 Abnormal Recycle: Hardware A2D mismatch
345 Abnormal Recycle: Hardware VSNSR A2D
346 Abnormal Recycle: Hardware 28V A2D
347 Abnormal Recycle: Hardware HFS IAS shorted
348 Abnormal Recycle: Hardware PII INTLK shorted
349 Abnormal Recycle: Hardware HFS LCI shorted
350 Abnormal Recycle: Hardware HFS LFS shorted
351 Abnormal Recycle: Invalid zero crossing
352 Abnormal Recycle: fault stack sensor
353 Abnormal Recycle: stack limit
354 Abnormal Recycle: delta T limit
355 Abnormal Recycle: fault outlet sensor
356 Abnormal Recycle: outlet high limit
357 Abnormal Recycle: fault DHW sensor
358 Abnormal Recycle: DHW high limit
359 Abnormal Recycle: fault inlet sensor
360 Abnormal Recycle: Check Parameters Failed
Internal Errors
361 Internal error: No factory parameters were
detected in control
362 Internal error: PID iteration frequency was invalid
363 Internal error: Demand-Rate interval time was
invalid
364 Internal error: Factory calibration parameter for
modulation was invalid
365 Internal error: CH PID P-scaler was invalid
366 Internal error: CH PID I-scaler was invalid
367 Internal error: CH PID D-scaler was invalid
368 Internal error: DHW PID P-scaler was invalid
369 Internal error: DHW PID I-scaler was invalid
370 Internal error: DHW PID D-scaler was invalid
371 Internal error: Lead Lag master PID P-scaler was
invalid
372 Internal error: Lead Lag master PID I-scaler was
invalid
373 Internal error: Lead Lag master PID D-scaler was
invalid
374 Abnormal Recycle: Hardware ame bias high
375 Abnormal Recycle: Hardware ame bias low
376 Abnormal Recycle: Hardware ame bias delta high
377 Abnormal Recycle: Hardware ame bias delta low
378 Abnormal Recycle: Hardware ame bias dynamic
high
379 Abnormal Recycle: Hardware ame bias dynamic
low
380 Abnormal Recycle: Fan Speed Not Proven
381 Abnormal Recycle: Fan Speed Range Low
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CODE DESCRIPTION
382 Abnormal Recycle: Fan Speed Range High
383-450 RESERVED
Circulator Errors
451 Circulator control was invalid
452 Circulator P-gain was invalid
453 Circulator I-gain was invalid
454 Circulator temperature was invalid
455 Circulator outlet temperature was invalid
456 Circulator inlet temperature was invalid
457 Circulator outdoor temperature was invalid
458 Circulator sensor choice was invalid
459 Circulator PID setpoint was invalid
Debug Faults
460 LCI lost in run
461 Abnormal Recycle: Demand lost in run from
application
462 Abnormal Recycle: Demand lost in run due to high
limit
463 Abnormal Recycle: Demand lost in run due to no
ame
464 LCI lost in Combustion Pressure Establishing
Period
465 LCI lost in Combustion Pressure Stabilization
Period
466 RESERVED
Internal Data Faults
467 Internal error: EEPROM write was attempted
before EEPROM was initialized
468 Internal error: EEPROM cycle count address was
invalid
469 Internal error: EEPROM days count address was
invalid
470 Internal error: EEPROM hours count address was
invalid
471 Internal error: Lockout record EEPROM index was
invalid
472 Internal error: Request to write PM status was
invalid
473 Internal error: PM parameter address was invalid
474 Internal error: PM safety parameter address was
invalid
475 Internal error: Invalid record in lockout history was
removed
476 Internal error: EEPROM write buffer was full
477 Internal error: Data too large was not written to
EEPROM
478 Internal error: Safety key bit 0 was incorrect
479 Internal error: Safety key bit 1 was incorrect
480 Internal error: Safety key bit 2 was incorrect
481 Internal error: Safety key bit 3 was incorrect
CODE DESCRIPTION
482 Internal error: Safety key bit 4 was incorrect
483 Internal error: Safety key bit 5 was incorrect
484 Internal error: Safety key bit 6 was incorrect
485 Internal error: Safety key bit 7 was incorrect
486 Internal error: Safety key bit 8 was incorrect
487 Internal error: Safety key bit 9 was incorrect
488 Internal error: Safety key bit 10 was incorrect
489 Internal error: Safety key bit 11 was incorrect
490 Internal error: Safety key bit 12 was incorrect
491 Internal error: Safety key bit 13 was incorrect
492 Internal error: Safety key bit 14 was incorrect
493 Internal error: Safety key bit 15 was incorrect
494 Internal error: Safety relay timeout
495 Internal error: Safety relay commanded off
496 Internal error: Unknown safety error occurred
497 Internal error: Safety timer was corrupt
498 Internal error: Safety timer was expired
499 Internal error: Safety timings
500 Internal error: Safety shutdown
501 RESERVED
MIX Errors
502 Mix setpoint was invalid
503 Mix time of day setpoint was invalid
504 Mix outdoor temperature was invalid
505 Mix ODR time of day setpoint was invalid
506 Mix ODR time of day setpoint exceeds normal
setpoint
507 Mix ODR max outdoor temperature was invalid
508 Mix ODR min outdoor temperature was invalid
509 Mix ODR low water temperature was invalid
510 Mix ODR outdoor temperature range was invalid
511 Mix ODR water temperature range was invalid
512 Mix demand switch was invalid
513 Mix ON hysteresis was invalid
514 Mix OFF hysteresis was invalid
515 Mix ODR min water temperature was invalid
516 Mix hysteresis step time was invalid
517 Mix P-gain was invalid
518 Mix I-gain was invalid
519 Mix D-gain was invalid
520 Mix control was suspended due to fault
521 Mix S10 (J10-7) temperature was invalid
522 Mix outlet temperature was invalid
523 Mix inlet temperature was invalid
524 Mix S5 (J8-11) temperature was invalid
525 Mix modulation sensor type was invalid
526 Mix ODR min water temperature setpoint was
invalid
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CODE DESCRIPTION
527 Mix circulator sensor was invalid
528 Mix ow control was invalid
529 Mix temperature was invalid
530 Mix sensor was invalid
531 Mix PID setpoint was invalid
532 STAT may not be a Mix demand source when
Remote Stat is enabled
533-539 RESERVED
540 Delta T inlet/outlet enable was invalid
541 Delta T exchanger/outlet enable was invalid
542 Delta T inlet/exchanger enable was invalid
543 Delta T inlet/outlet degrees was out of range
544 Delta T exchanger/outlet degrees was out of range
545 Delta T inlet/exchanger degrees was out of range
546 Delta T response was invalid
547 Delta T inversion limit response was invalid
548 Delta T rate limit enable was invalid
549 Delta T exchanger/outlet wasn't allowed due to
stack limit setting
550 Delta T inlet/outlet limit was exceeded
551 Delta T exchanger/outlet limit was exceeded
552 Delta T inlet/exchanger limit was exceeded
553 Inlet/outlet inversion occurred
554 Exchanger/outlet inversion occurred
555 Inlet/exchanger inversion occurred
556 Delta T exchanger/outlet wasn't allowed due to
stack connector setting
557 Delta T inlet/exchanger wasn't allowed due to
stack limit setting
558 Delta T inlet/exchanger wasn't allowed due to
stack connector setting
559 Delta T delay was not congured for recycle
response
T Rise Errors
560 Outlet T-rise enable was invalid
561 Heat exchanger T-rise enable was invalid
562 T-rise degrees was out of range
563 T-rise response was invalid
564 Outlet T-rise limit was exceeded
565 Heat exchanger T-rise limit was exceeded
566 Heat exchanger T-rise wasn't allowed due to stack
limit setting
567 Heat exchanger T-rise wasn't allowed due to stack
connector setting
568 Outlet T-rise wasn't allowed due to outlet
connector setting
569 T-rise delay was not congured for recycle
response
Heat Exchanger High Limit Errors
570 Heat exchanger high limit setpoint was out of
range
CODE DESCRIPTION
571 Heat exchanger high limit response was invalid
572 Heat exchanger high limit was exceeded
573 Heat exchanger high limit wasn't allowed due to
stack limit setting
574 Heat exchanger high limit wasn't allowed due to
stack connector setting
575 Heat exchanger high limit delay was not
congured for recycle response
Pump Errors
576 CH pump output was invalid
577 DHW pump output was invalid
578 Boiler pump output was invalid
579 Auxiliary pump output was invalid
580 System pump output was invalid
581 Mix pump output was invalid
582-589 RESERVED
DHW Plate Heat Exchanger Errors
590 DHW plate preheat setpoint was invalid
591 DHW plate preheat ON hysteresis was invalid
592 DHW plate preheat OFF hysteresis was invalid
593 Tap detect degrees was out of range
594 Tap detect ON hysteresis was invalid
595 Inlet - DHW tap stop degrees was out of range
596 Outlet - Inlet tap stop degrees was out of range
597 DHW tap detect on threshold was invalid
598 DHW plate preheat detect on threshold was invalid
599 DHW plate preheat detect off threshold was invalid
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MAINTENANCE PROCEDURES
MAINTENANCE SCHEDULES
Yearly procedures for Service Technician:
• Check for reported problems.
• Check the interior; clean and vacuum if needed.
• Clean the condensate trap and ll with fresh water.
• Check for water/gas/ue/ condensate leaks.
• Ensure ue and air lines in good condition and sealed
tight
• Check system water pressure/system piping/expansion
tank
• Check control settings.
• Check spark igniter and ame sensors. Clear and clean
any deposits.
• Check wiring and connections.
• Perform start-up checkout and performance verication.
• Flame inspection (stable, uniform)
• Flame signal (at least 10 microamps at high re)
• Clean the heat exchanger if ue temperature is more
than 54°F (30°C) above return water temperature.
• Test low water ow conditions.
• Clean the heat exchanger.
• Remove and clean burner using compressed air.
Maintenance by Owner:
Daily:
• Check boiler area .
• Check pressure/temperature gauge.
Monthly:
• Check vent piping.
• Check air intake piping (Direct Vent).
• Check air and vent termination screens.
• Check relief valve.
• Check condensate drain system.
• Check automatic air vents .
Every 6 months:
• Check boiler piping (gas and water) for leaks.
• Check and operate the pressure relief valve.
End of season months:
• Shut the boiler down (unless boiler used for domestic hot
water)
Make sure the maintenance of the boiler must be performed to
assure maximum boiler efciency and reliability. Failure to service
and maintain the boiler and system could result in equipment
failure.
Make sure to turn off power to the boiler before any service
operation on the boiler except as noted otherwise in this
instruction manual. Failure to turn off electrical power could result
in electrical shock, causing severe personal injury or death.
INSPECT BOILER AREA
1. Verify that boiler area is free of any combustible materials,
gasoline and other ammable vapors and liquids.
2. Verify that air intake area is free of any of the contaminants.
If any of these are present in the boiler intake air vicinity,
they must be removed. If they cannot be removed, reinstall
the air and vent lines per this manual.
Inspect boiler interior:
1. Remove the front access cover and inspect the interior of
the boiler.
2. Vacuum any sediment from inside the boiler and components.
Remove any obstructions.
GENERAL MAINTENANCE
This is a pre-mix burner system. The ame is not supposed to be
directly on the burner. The ame should be just above the burner
deck approximately 1/8” and blue in color, see Figure 77.
FIGURE 77. BURNER FLAMES
Visually check ame characteristics through the view port located
on the top head of the boiler. Figure 77 shows the normal ame
condition.
These boilers are designed to give many years of efcient and
satisfactory service when properly operated and maintained.
To assure continued good performance, the following
recommendations are made.
The area around the unit should be kept clean and free from lint
and debris. Sweeping the oor around the boiler should be done
carefully. This will reduce the dust and dirt which may enter the
burner and heat exchanger, causing improper combustion and
sooting.
MAIN BURNER
Check main burner every three months for proper ame
characteristics. The main burner should display the following
characteristics:
•Provide complete combustion of gas.
• Cause rapid ignition and carry over of ame across entire burner.
• Give reasonably quiet operation during initial ignition, operation
and extinction.
• Cause no excessive lifting of flame from burner ports.
76
Page 77
If the preceding burner characteristics are not evident, check for
accumulation of lint or other foreign material that restricts or blocks
the air openings to the burner or boiler. To check burners:
1. Shut off all gas and electricity to unit. Allow unit to cool.
2. Remove main burners from unit.
3. Check that burner ports are free of foreign matter.
4. Clean burner with vacuum cleaner. Do not distort burner
ports.
5. Reinstall burners in unit. Ensure that all the screws on the
burner ange are tightened securely so that the gasket will
provide a good seal.
6. Also check for good ow of combustion and ventilating air
to the unit.
After placing the boiler in operation, check the ignition system
safety shut-off devices for proper operation. To accomplish this
with the main burner operating, close the valve on the manifold.
Within four seconds the main burners should extinguish. If this
does not occur immediately, discontinue gas supply by closing
main manual shut-off and call a qualied serviceman to correct
the situation. If the burners extinguish, then light boiler in
accordance with lighting and operating instructions.
5. Loosen the seven bolts on the blower adapter at the base
and move the burner ground wire (Green) aside.
6. Lift the blower adapter and remove the manifold assembly
up from the 6 studs located on the cover plate and remove
the burner gasket.
7. Remove any loose foreign material such as dust or lint with a
vacuum. Check all ports for blockage. Dislodge any foreign
material causing blockage. Remove any soot or carbon
deposits with a rag making sure to remove any lint left on
the burner by vacuuming again.
8. Reverse the steps to reassemble the unit.
9. Restore electrical power and gas supply to the boiler.
• Put the boiler back in operation by following the Lighting
and Operating instructions in this manual.
• Check for gas leaks and proper boiler and vent
operation.
PRESSURE RELIEF VALVE
The pressure relief valve should be opened at least twice a year
to check its working condition. This will aid in assuring proper
pressure relief protection. Lift the lever at the top of the valve
several times until the valve seats properly and operates freely.
Any safety devices including low water cutoffs used in conjunction
with this boiler should receive periodic (every six months)
inspection to assure proper operation. A low water cutoff device
of the oat type should be ushed every six months. Periodic
checks, at least twice a year, should be made for water leaks.
More frequent inspections may be necessary depending on
water conditions.
The boiler-mounted gas and electrical controls have been
designed to give both dependable service and long life.
However, malfunction can occur, as with any piece of equipment.
It is therefore recommended that all components be checked
periodically by a qualied serviceman for proper operation.
BURNER MAINTENANCE
Qualied service agent should follow this procedure when the
boiler’s burner needs cleaning.
1. Turn off the electrical power to the boiler and close the main
manual gas shutoff valve(s). Allow the boiler parts to cool
before disassembly.
2. Loosen the ange and separate the gas train from the
manifold assembly.
3. Separate the burner from the blower adapter by rst
removing the four (4) bolts and subsequently, the blower
gas kets. The blower should be free to move at this point.
4. For Direct Vent units: It is necessary to loosen and slide
the rubber coupling on the blower adaptor in order to
move the blower.
BLOWER COMPARTMENT
The blower compartment should be cleaned annually to remove
any dirt and lint that may have accumulated in the compartment
or on the blower and motor. Buildups of dirt and lint on the
blower and motor can create excessive loads on the motor
resulting in higher that normal operating temperatures and
possible shortened service life.
AIR FILTER BOX
The air lter box should be cleaned every three months to remove
any dust and debris that may have accumulated in the air lter
or the lter housing. Buildups of dust on the air lter can block
the air intake into the boiler. Air lter can washed and cleaned
with water.
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Page 78
CONDENSATE REMOVAL SYSTEM
Due to the highly efficient operation of this unit, condensate
is formed during operation and must be removed by the
conden sate drain systems. Inspect the condensate drains
and tubes at least once a month and insure they will allow
the free flow of condensate at all times. The system must
be inspected more frequently in cold weather if the drain
system is located in an area, such as along the floor, where
freezing tempera tures are likely to occur. The conden sate
drain system must be protected against freezing. Contact a
qualified service agent to inspect and correct the condition if
freezing of the conden sate lines is a problem.
The transparent drain lines and condensate drain on the bottom
of the vent collector should be visually inspected at one month
intervals for blockage, particularly in the areas of the loops in the
lines which trap a small amount of conden sate, and the exit point
of the vent collector drain. Conden sate in portions of the line
other than the loop area indicates a blockage in the drain line.
Flush the lines with air or water and clear or replace the blocked
portions of the line as necessary. Note that areas of the drain
line which include a sag or low spot in the line will also form a
condensate trap which can be removed by levelling the tube and
does not indicate a blocked system.
Inspect the metal vent drain and vent collector drain connectors
at six month inter vals. Remove the hoses from the connections,
then check with a small wooden dowel or plastic rod passed
up through the metal con nection to insure the passage is clear,
using caution to not bend or damage the connector. Call a
qualied service agent to inspect and correct the problem if any
obstructions are found in the connectors. Replace all hoses and
clamps immediately after inspec tion and before starting the boiler
in accordance with the Lighting and Operating Instructions. Do not
operate the boiler unless all condensate drain lines are properly
connected and working. When a means to neutralize condensate
has been installed you must also follow operating, inspection and
maintenance procedures specied by the manufacturer of the
product. Inspect the installed device to insure that it does not
cause condensate to remain in the boiler or vent for any reason.
VENTING MAINTENANCE
It is recommended that the intake and exhaust piping of the
boiler be checked every 6 months for dust, condensate leakage,
deterioration and carbon deposits.
1. Turn off the electrical power, and manual gas shut-off.
• Allow boiler parts to cool before disassembly.
2. Remove the vent pipe.
• Check parts and chimney for obstructions and clean as
necessary.
3. Remove burner from boiler and other metal parts as required
to clean as necessary.
• Refer to parts list for disassembly aid.
4. Clean and reinstall the parts removed in steps 2 and 3.
• Be sure the vent pipe has a minimum upward pitch of 1/4"
per foot (2 cm/m) of length and is sealed as necessary.
5. Restore electrical power and gas supply to boiler.
• Check for gas leaks and proper boiler and vent operation.
HEAT EXCHANGER MAINTENANCE
1. Shut down the boiler:
• Turn Off gas to the boiler.
• Do not drain the boiler unless it will be exposed to
freezing temperatures. If using freeze prevention uid in
system, do not drain.
2. Ensure the boiler cools down to room temperature.
3. Remove the nuts securing the heat exchanger access cover
to the heat exchanger and set aside.
4. Remove the heat exchanger access cover, burner, and gas
train assembly.
Note: The boiler contains ceramic ber materials. Failure to
comply could result in severe personal injury.
5. Remove the condensate hose from the heat exchanger end.
Connect a eld supplied 3/4" diameter hose to a drain pan.
6. Use a vacuum cleaner to remove any deposits/ debris on the
boiler heating surfaces. Do not use any solvent.
7. Brush the heat exchanger while dry using a nylon bristle
brush. Re-vacuum the heat exchanger.
8. Finish cleaning using a clean cloth dampened with warm
water. Rinse out debris with a low pressure water supply.
9. Allow the heat exchanger to dry completely.
10. Remove the rear refractory cover from the back of the
combustion chamber of the heat exchanger and reassemble.
11. Close isolation valves on piping to isolate the boiler from
system. Attach a hose to the boiler drain and ush boiler
thoroughly with clean water by using purging valves to allow
water to ow through the water make-up line to the boiler.
12. Replace the access cover and restore the boiler for operation.
Qualied service agent should follow this procedure when the
boiler’s intake and exhaust piping need cleaning:
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Page 79
HANDLING CERAMIC FIBER MATERIALS
Removal of combustion chamber lining:
The combustion chamber insulation in this boiler contains ceramic
ber material. Ceramic bers can be converted to cristobalite in
very high temperature applications. The International Agency for
Research on Cancer (IARC) has concluded, “Crystalline silica
in the form of quartz or cristobalite from occupational sources
is carcinogenic to humans (Group 1).” Normal operating
temperatures in this boiler are below the level to convert ceramic
bers to cristobalite.
The ceramic ber material used in this boiler is an irritant; hence
when handling or replacing the ceramic materials it is advisable
that the installer follow these safety guidelines.
1. Avoid breathing dust and contact with skin and eyes.
• Use NIOSH certied dust respirator (N95). This type
of respirator is based on the OSHA requirements for
cristobalite at the time this document was written. Other
types of respirators may be needed depending on the
job site conditions. Current NIOSH recommendations
can be found on the NIOSH website at http://www.cdc.
gov/niosh/homepage.html. NIOSH approved respirators,
manufacturers, and phone numbers are also listed on
this website.
• Wear long-sleeved, loose tting clothing, gloves, and eye
protection.
2. Apply enough water to the combustion chamber lining to
prevent airborne dust.
3. Remove the combustion chamber lining from the boiler and
place it in a plastic bag for disposal.
4. Wash potentially contaminated clothes separately from
other clothing. Rinse clothes washer thoroughly.
NIOSH stated First Aid:
• Eye: Irrigate immediately.
• Breathing: Fresh air.
REPLACEMENT PARTS
Replacement parts may be ordered through A. O. Smith dealers,
authorized servicers or distributors. Refer to the Yellow Pages
for where to call or contact (in United States) the A. O. Smith
Water Products Company, 500 Tennessee Waltz Parkway,
Ashland City, TN 37015, 1-800-433-2545 or (in Canada) A.
O. Smith Enterprises Ltd., 599 Hill Street West, Fergus, ON
N1M2X1, 1-888-479-2837. When ordering parts be sure to state
the quantity, part number and description of the item including the
complete model and serial number as it appears on the product.
Refer to the parts list for more information.
For Technical Assistance call A. O. Smith Technical Information
Center at 1-800-527-1953.
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Page 80
PIPING DIAGRAMS
LOOP TEMPERATURE PROBE
FULL PORT BALL VALVE
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALV E
CHECK VALV E
PRESSURE RELIEF VALV E
TEMPERATURE GAGE
WATER FLOW SWITCH
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
SYSTEM RETURN
FINISHED FLOOR
SECONDARY BOILER PUMP - OPTIONAL
PLACES TEES AS CLOSE TOGETHER AS PRACTICAL
MAKE-UP
WATER
MODEL INLET DIA. OUTLET DIA.
XB-1000 2” 2”
XB-1300 2” 2”
WARNING: THIS DRAWING SHOWS SUGGESTED
XP BOILERS 1000–3400 - ONE BOILER PRIMARY / SECONDARY HYDRONIC
PIPING SYSTEM
PIPING CONFIGURATION AND OTHER DEVICES;
XB-1700 2.5” 2.5”
XB-2000 3” 3”
XB-1600 3” 3”
XB-3400 4” 4”
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
AIR SEPARATOR
SYSTEM SUPPLY
SYSTEM PUMP
EXPANSION
TANK
FIGURE 78. PRIMARY/SECONDARY PIPING SYSTEM
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
4. The boiler is shown with the optional factory installed and sized secondary boiler pump that is available on all XB models.
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FULL PORT BALL VALVE
CHECK VALVE
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
SYSTEM
RETURN
COLD WATER
SUPPLY
EXPANSION
TANK
MODEL INLET DIA. OUTLET DIA.
XW-1000 2” 2”
HOT WATER
TO FIXTURES
ALTERNATE CONNECTION
STORAGE TANK
AOS
XW-1300 2” 2”
XW-1700 2.5” 2.5”
XW-2000 3” 3”
XW-1600 3” 3”
XW-3400 4” 4”
FIGURE 79. HOT WATER SUPPLY BOILER WITH VERTICAL TANK
XP BOILERS 1000–3400 - ONE BOILER/VERTICAL STORAGE TANK RECOVERY
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
SYSTEM (ONE TEMPERATURE)
FOR ADDITIONAL REQUIREMENTS.
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FINISHED FLOOR
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
4. A. O. Smith piping method is based on 50 equivalent feet of piping. Boiler placement shall be as close as practical to the
storage tank. Applications in excess of these recommendations shall require a licensed engineer for design assistance.
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LIMITED WARRANTY
A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this boiler:
1. If within TEN years after initial installation of the boiler, a heat exchanger or gas burner should prove upon examination by the warrantor to be defective in
material or workmanship, the warrantor, at his option will exchange or repair such part or portion. This term is reduced to FIVE years if this boiler is used
for water heating purposes other than hydronic space heating.
a. This warranty is extended to the owner for all other parts or portion during the FIRST year following initial installation of this boiler.
b. The warranty on the repair or replacement of the part or portion will be limited to the unexpired term of the original warranty.
2. CONDITIONS AND EXCEPTIONS
This warranty should apply only when the boiler is installed in accordance with local plumbing and building codes, ordinances and regulations, the printed
instructions provided with it and good industry practices. In addition, a pressure relief valve, certied by C.S.A. and approved by the American Society of
Mechanical Engineers, must have been installed and fresh water used for lling and make-up purposes.
a. This warranty should apply only when the boiler is used:
(1) with outlet water temperatures not exceeding the maximum setting of its operative and/or high limit control;
(2) at water pressure not exceeding the working pressure shown on the boiler;
(3) when lled with boiler water, free to circulate at all times and with the heat exchanger free of damaging scale deposits;
(4) in a non-corrosive and non-contaminated atmosphere;
(5) in the United States, its territories or possessions, and Canada;
(6) at a water velocity ow rate not exceeding or below the boiler’s designed rates;
(7) indoor installation only.
b. Any accident to the boiler, any misuse, abuse (including freezing) or alteration of it, any operation of it in a modied form, or any attempt to repair leaks
in the heat exchanger will void this warranty.
3. SERVICE AND REPAIR EXPENSE
Under this limited warranty the warrantor will provide only a replacement part. The owner is responsible for all other costs. Such costs may include but are
not limited to:
a. Labor charges for service, removal, repair, or reinstallation of the component part;
b. Shipping, delivery, handling, and administrative charges for forwarding the replacement part from the nearest distributor and returning the claimed defec-
tive part to such distributor.
c. All cost necessary or incidental for any material and/or permits required for installation of the replacement.
4. LIMITATIONS ON IMPLIED WARRANTIES
Implied warranties, including any warranty of merchantability imposed on the sale of this boiler under state or provincial law are limited to one (1) year
duration for the boiler or any of its parts. Some states and provinces do not allow limitations on how long an implied warranty lasts, so the above limitation
may not apply to you.
5. CLAIM PROCEDURE
Any claim under this warranty should be initiated with the dealer who sold the boiler, or with any other dealer handling the warrantor’s products. If this is
not practicable, the owner should contact:
U.S. Customers Canadian Customers
A. O. Smith Corporation A. O. Smith Enterprises Ltd.
500 Tennessee Waltz Parkway 599 Hill Street West
Ashland City, TN 37015 Fergus, ON N1M 2X1
Telephone: 800-527-1953 Telephone: 1-888-479-2837
a. The warrantor will only honor replacement with identical or similar parts thereof which are manufactured or distributed by the warrantor.
b. Dealer replacements are made subject to in-warranty validation by warrantor.
6. DISCLAIMERS
NO OTHER EXPRESS WARRANTY HAS BEEN OR WILL BE MADE ON BEHALF OF THE WARRANTOR WITH RESPECT TO THE MERCHANTABILITY OF
THE BOILER OR THE INSTALLATION, OPERATION, REPAIR OR REPLACEMENT OF THE BOILER. THE WARRANTOR Should NOT BE RESPONSIBLE
FOR WATER DAMAGE, LOSS OF USE OF THE UNIT, INCONVENIENCE, LOSS OR DAMAGE TO PERSONAL PROPERTY, OR OTHER CONSEQUENTIAL
DAMAGE. THE WARRANTOR Should NOT BE LIABLE BY VIRTUE OF THIS WARRANTY OR OTHERWISE FOR DAMAGE TO ANY PERSONS OR
PROPERTY, WHETHER DIRECT OR INDIRECT, AND WHETHER ARISING IN CONTRACT OR TORT.
a. Some states and provinces do not allow the exclusion or limitation of the incidental or consequential damage, so the above limitations or exclusions may
not apply to you.
b. This warranty gives you specic legal rights, and you may also have other rights which vary from state to state or province to province.
Fill in the following for your own reference. Keep it. Registration is not a condition of warranty. The model and serial number are found on the boiler’s rating plate.
Owner______________________________________________________________________________________________________________________________________
Installation Address_________________________________________________________________________________________________________________________
City and State__________________________________________________________________________________ Zip Code __________________________________
Date Installed____________________ Model No. __________________________________________Serial No. ___________________________________________
Dealer’s Name___________________________________________________________________________ Phone No._______________________________________
Dealer’s Address ________________________________________________________________________________________________________________________
______________________________________________________________________________________________________________________________________
FILL IN WARRANTY AND KEEP FOR FUTURE REFERENCE
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Technical Support: 800-527-1953 • Parts: 800-433-2545 • Fax: 800-644-9306
25589 Highway 1, McBee, SC 29101
www.hotwater.com
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