Lochinvar CWN090, CWN135, CWN180, CWN199, CWN225 Installation Manual
...
CFA-I-S_100160907_2000001336_Rev H
Installation & Service Manual
Models: 90,000 - 500,000 Btu/hr
WARNING:
This manual supplies information for the
installation, operation, and servicing of the
appliance. It is strongly recommended that
this manual be reviewed completely before
proceeding with an installation. Perform
steps in the order given. Failure to comply
could result in severe personal injury, death,
or substantial property damage.
Save this manual for future reference.
Contents
HAZARD DEFINITIONS .................................................... 2
PLEASE READ BEFORE PROCEEDING ..................... 3-4
RATINGS ........................................................................ 5-6
THE COPPER-FIN -- HOW IT WORKS ............................... 7-9
1. DETERMINE UNIT LOCATION
Location of Unit ................................................................ 10
Clearances from Combustible Construction .....................10
Combustion and Ventilation Air .................................. 11-13
2. VENTING
A Conventional Negative Draft Venting System ......... 14-15
Vertical Vent Termination Clearances ............................. 16
Masonry Chimney Installation .......................................... 17
Inspection of a Masonry Chimney .............................. 17
Automatic Vent Damper ................................................... 20
3. GAS CONNECTIONS
Gas Supply ....................................................................... 21
Gas Pressure Test ........................................................... 21
Gas Connection ............................................................... 21
Gas Piping ........................................................................ 22
Gas Manifold Pressure Adjustment Procedure ................ 23
Checking Gas Supply Pressure ....................................... 24
Combination Gas Valves .................................................. 25
4. HYDRONIC PIPING
Relief Valve ...................................................................... 26
Water Flow Switch (if equipped) ...................................... 26
Low Water Cutoff (if equipped) ........................................ 27
Typical Heating Boiler Installations ............................. 27-28
Piping of the Boiler System .............................................. 28
Water Connections Heating Boilers Only ......................... 29
Circulator Pump Requirements ........................................ 29
Circulator Pump Specifications ...................................... 29
Circulator Pump Operation (Heating Boilers Only) ........ 29
Primary/Secondary Boiler Piping ..................................... 30
Low Temperature Bypass Requirements ......................... 31
Three Way Valves ............................................................ 31
Boiler Flow Rates ............................................................. 31
Figure 4-4_Prim. / Sec. Piping of a Single Boiler ....... 32
Figure 4-5_Prim. / Sec. Piping w/Low Temp. Bypass 33
Figure 4-6_Multiple Boilers Zoned w/Circulators ........ 34
5. ELECTRICAL CONNECTIONS
Boiler Operating Temperature Control ............................. 35
Room Thermostat or Remote Thermostat Connection .... 35
Power Venter Connection to Terminal Strip .................... 35
Pump Wiring for a Heating Boiler .................................... 36
Temperature Adjustment .................................................. 36
Temperature Control Settings .......................................... 37
Maximum Set Point Determination .................................. 37
Outdoor Air Reset Option ................................................. 38
Additional Temperature Controls ................................ 40-41
Blocked Vent and Flame Roll-Out / Flame Interlock Switch . 41
6. STARTUP
Initial Startup .................................................................... 42
Lighting Instructions for Standing Pilot Models (F1) ... 42-44
Safety Shutoff Test for Standing Pilot Ignition System .... 44
Lighting Instructions for Spark Ignition Pilot Models (F9/M9) 45-46
Safety Shutoff Test for Spark Ignition Pilot System ............ 46
Intermittent Pilot Spark Ignition System (F9/M9) ................. 46
Freeze Protection ........................................................................... 46
Water Treatment ....................................................................... 47-49
7. DOMESTIC WATER HEATERS
Water Velocity Control ..................................................... 50
Required Temperature Rise ............................................. 50
Water Chemistry............................................................... 51
Softened Water Systems ................................................. 51
Pump Operation ............................................................... 51
Figure 7-1_Single Water Heater Piping w/Single Tank ... 52
Figure 7-2_Single Water Heater Piping w/Multiple Tanks 53
Figure 7-3_Multiple Water Heater Piping w/Single Tank . 54
Remote Sensor Installation .............................................. 55
Heat Exchanger ............................................................... 55
Thermostat Settings .................................................... 55-56
Optional Relief Valve ........................................................ 57
Thermal Expansion .......................................................... 57
Cathodic Protection .......................................................... 57
8. MAINTENANCE
Maintenance and Annual Startup ................................ 58-64
9. TROUBLESHOOTING ............................................ 65-66
10. DIAGRAMS ............................................................67-70
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels
or to important information concerning the life of the product.
DANGER
WARNING
CAUTION
CAUTION
NOTICE
2
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate
injury.
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
NOTICE indicates special instructions on installation, operation, or maintenance that are important but not
related to personal injury or property damage.
Please read before proceeding
Installation & Service Manual
NOTICE
WARNING
This is a gas appliance and should be installed
by a licensed electrician and/or certified gas
supplier. Service must be performed by a
qualified service installer, service agency or
the gas supplier.
If the information in these instructions is
not followed exactly, a fire or explosion may
result causing property damage, personal
injury, or death.
This appliance MUST NOT be installed in
any location where gasoline or flammable
vapors are likely to be present, unless the
installation is such to eliminate the probable
ignition of gasoline or flammable vapors.
What to do if you smell gas –
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any
phone in your building.
• Immediately call your gas supplier from a near by phone.
Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
WARNING
Improper installation, adjustment,
alteration, service or maintenance can
cause injury or property damage. Refer
to this manual for assistance or additional
information, consult a qualified installer,
service agency or the gas supplier.
Checking equipment –
Upon receiving equipment, check for signs of shipping
damage. Pay particular attention to parts accompanying the
appliances which may show signs of being hit or otherwise
being mishandled. Verify total number of pieces shown on
the packing slip with those actually received. In case there is
damage or a shortage, immediately notify the carrier.
Do not use this appliance if any part has been under water.
The possible damage to a flooded appliance can be extensive
and present numerous safety hazards. Any appliance that has
been under water must be replaced.
Owner warning –
NOTE: Retain this manual for future reference.
The information contained in this manual is intended for use
by qualified professional installers, service technicians, or gas
suppliers. Consult your local expert for proper installation
or service procedures.
Installation and service must be performed by a qualified
installer, service agency, or the gas supplier.
Warranty –
Installation and service must be performed by a qualified
service installer, service agency or the gas supplier.
Factory warranty (shipped with unit) does not apply to units
improperly installed or improperly operated.
Experience has shown that improper installation or system
design, rather than faulty equipment, is the cause of most
operating problems.
1. Excessive water hardness causing a lime/scale build-up in
the copper tube is not the fault of the equipment and is
not covered under the manufacturer’s warranty (see
Water Treatment and Water Chemistry).
2. Excessive pitting and erosion on the inside of the copper
tube may be caused by too much water velocity through
the tubes and is not covered by the manufacturer’s
warranty (see Boiler Flow Rates and Temperature Rise for
flow requirements).
IMPORTANT
Your conventionally vented gas appliance must have a supply
of fresh air circulating around it during burner operation for
proper gas combustion and proper venting.
WARNING
Consult and follow all local Building and
Fire Regulations and other Safety Codes
that apply to this installation. Consult your
local gas utility company to authorize and
inspect all gas and flue connections.
Should overheating occur or the gas supply
fail to shut off, do not turn off or disconnect
the electrical supply to the pump. Instead,
shut off the gas supply at a location external
to the appliance.
33
Installation & Service Manual
Please read before proceeding
WARNING
To minimize the possibility of serious
personal injury, fire, or damage to your
appliance, never violate the following safety
rules:
1. Boilers and water heaters are heat
producing appliances. To avoid damage
or injury, do not store materials against
the appliance or the vent-air intake
system. Use proper care to avoid
unnecessary contact (especially children)
with the appliance and vent-air intake
components.
2. Never cover your appliance, lean
anything against it, store trash or debris
near it, stand on it or in any way block
the flow of fresh air to your appliance.
3. UNDER NO CIRCUMSTANCES must
flammable materials such as gasoline or
paint thinner be used or stored in the
vicinity of this appliance, vent-air intake
system or any location from which fumes
could reach the appliance or vent-air
intake system.
Codes –
The equipment shall be installed in accordance with those
installation regulations in force in the local area where the
installation is to be made. These regulations shall be carefully
followed in all cases. Authorities having jurisdiction shall be
consulted before installations are made. In the absence of
such requirements, the installation shall conform to the latest
edition of the National Fuel Gas Code, ANSI Z223.1. Where
required by the authority having jurisdiction, the installation
must conform to American Society of Mechanical Engineers
Safety Code for Controls and Safety Devices for Automatically
Fired Boilers, ASME CSD-1. All boilers conform to the latest
edition of the ASME Boiler and Pressure Vessel Code, Section
IV. Where required by the authority having jurisdiction,
the installation must comply with the Canadian Association
Code, CAN/CGA- B149.1 and/or local codes.
This appliance meets the safe lighting performance criteria
with the gas manifold and control assembly provided as
specified in the ANSI standards for gas-fired appliances,
ANSI Z21.13 and ANSI Z21.10.3.
Boiler water –
Thoroughly flush the system to remove debris. Use an approved
pre-commissioning cleaner (see Start-Up Section), without the
boiler connected, to clean the system and remove sediment.
The high-efficiency heat exchanger can be damaged by build-up
or corrosion due to sediment.
NOTE: Cleaners are designed for either new systems or
pre-existing systems. Choose accordingly.
Prevention of freezing –
Heat exchangers and headers damaged by freezing are not
covered by warranty.
See Section 6, Start-Up - Freeze Protection for more information.
4
Ratings
Copper-Fin
AHRI Rating
Installation & Service Manual
Other Specifications
Model Number
Note: Change
“N” to “L” for
L.P. gas models
CBN315 158 315 258 224
CBN360 180 360 295 257
CBN399 200 399 328 285
CBN500 250 500 410 357
NOTICE
Maximum allowed working pressure is located on the rating plate.
Input
MBH
(Note 4)
MIN MAX
Gross
Output
MBH
(Note 1)
Notes:
1. The ratings are based on standard test procedures
prescribed by the United States Department of Energy.
2. Net AHRI ratings are based on net installed radiation of
sufficient 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.
Net
AHRI
Ratings
Water,
MBH
(Note 2)
Boiler
Water
Content
Gallons
1.2
1.2
1.3
1.4 2" 1" 10"
Water
Connections
2" 3/4" 8"
2" 1" 9"
2" 1" 10"
Gas
Connections
HIGH ALTITUDE
UNIT EQUIPPED FOR
UP TO 2000 FT.
Vent Size
(Note 3)
3. Copper-fins require special gas venting. Use only the vent
materials and methods specified in the Installation and
Service Manual.
4. The Copper-fin is orificed for operation up to 2000
feet altitude. The ap pli ance will be derated 4% per 1000
feet above 2000 feet el e va tion. Consult the factory for
installations above 2000 feet elevation.
5. Ratings have been confirmed by AHRI.
Figure A High Altitude Label Location
5
Ratings
Installation & Service Manual
HLW
LOW LEAD CONTENT
Copper-fin Specifications
Model Number
Note: Change “N” to
“L” for L.P. gas models
CWN090 90 1.0 2" 1/2" 5"
CWN135 135 1.0 2" 1/2" 6"
CWN180 180 1.1 2" 3/4" 7"
CWN199 199 1.1 2" 3/4" 7"
CWN225 225 1.1 2" 3/4" 7"
CWN270 270 1.1 2" 3/4" 8"
CWN315
CWN360
CWN399
CWN500
Input
MBH
315 1.2 2" 3/4" 8"
360 1.2 2" 1" 9"
399 1.3 2" 1" 10"
500 1.4 2" 1" 10"
Water
Content Gallons
Water Connections Gas Connections
Vent Size
(Note 1)
NOTICE
Maximum allowed working pressure is located on the rating plate.
Notes:
1. Copper-fins require special gas venting. Use only the vent
materials and methods specified in the Installation and
Service Manual.
2. The Copper-fin is orificed for operation up to 2000
feet altitude. The ap pli ance will be derated 4% per 1000
feet above 2000 feet el e va tion. Consult the factory for
installations above 2000 feet elevation.
UNIT EQUIPPED FOR
HIGH ALTITUDE
UP TO 2000 FT.
Figure B High Altitude Label Location
6
Installation & Service Manual
The Copper-fin - How it works...
1. Control panel cover
The control panel cover provides access to the thermostat,
ignition module, and transformer.
2. Drain port (not shown)
Location from which the heat exchanger can be drained.
3. Flue outlet
The flue outlet allows the connection of the vent pipe to the unit.
4. Gas connection pipe
The gas pipe connection on this appliance should be connected to
the incoming gas supply for the purpose of delivering gas to the
appliance.
5. Gas valve
The gas valve allows the proper amount of gas to pass into the
burner for combustion.
6. Heat exchanger
The heat exchanger allows system water to flow through specially
designed tubes for maximum heat transfer. The glass lined
headers and copper finned tubing are encased in a jacket that
contains the combustion process.
7. High limit sensor
Device that monitors the outlet water temperature to ensure
safe operation. If the temperature exceeds its setting , it will break
the control circuit, shutting the appliance down.
8. Ignition module (F9 and M9 models only)
The ignition module responds to a call for heat signal to provide
burner operation .
9. Junction box
The junction box contains the connection points for the line
voltage power and the pump.
10. Relief valve
The relief valve is a safety device that ensures the maximum
pressure of the appliance is not exceeded. Water heaters are
supplied with a temperature and pressure relief valve.
15. Water inlet
The water inlet is a 2" pipe connection that receives water from the
system and delivers it to the heat exchanger.
16. Water outlet
The water outlet is a 2" pipe connection that supplies water to
the system .
17. Burner (not shown)
The burner is a cylindrical stainless steel tube used to regulate
burner flame.
18. Pilot (not shown)
( F9 and M9 models only)
The pilot is a spark ignition device is used to light a pilot flame
which in turn is used to light the main burners.
( F1 models only)
The pilot uses a standing flame to light the main burner.
19. Sight Glass (not shown)
The sight glass provides a view of the burner surface, burner
flame, and the pilot flame.
20. Temperature and pressure gauge (CB models only)
The temperature and pressure gauge monitors the outlet
temperature of the boiler as well as the system water pressure.
21. Pump (shipped with CW models only)
The pump ensures adequate flow to operate the unit.
22. Pump relay
The pump relay energizes the pump on a call for heat.
23. Temperature sensor
This sensor monitors inlet water temperature. If selected as the
controlling sensor, the appliance will maintain the setpoint at this
sensor.
11. Terminal strip
The boiler is equipped with a terminal strip on the left side of the
control panel to allow easy connection to contact points on the
unit.
12. Thermostat
The thermostat monitors the water temperature via a temperature
sensor and will initiate a call for heat when the water temperature
drops below the setpoint plus the differential on the thermostat.
13. Temperature gauge (CW models only)
The temperature gauge monitors the inlet temperature of the
water heater as well as the outlet temperature.
14. Transformer
The transformer reduces 120 VAC supply voltage to 24 VAC for the
control circuit.
7
Installation & Service Manual
The Copper-fin - How it works...
10
16
21
15
5
Models CWN270 Front View
3
3
1
1
10
16
9
11
21
5
15
9
11
Model CWN399 Front View
7
13
23
4
Model CWN270 (inside unit)
22
14
6
6
8
12
13
8
12
7
23
4
14
22
Model CWN399 (inside unit)
8
Installation & Service Manual
The Copper-fin - How it works... (continued)
20
10
16
15
5
Model CBN399 Front View
11
3
1
9
6
20
10
16
15
5
Model CBN500 Front View
3
1
9
11
6
7
23
4
Models CBN399 (inside unit)
22
14
12
8
8
12
7
14
23
22
4
Model CBN500 (inside unit)
9
1 Determine unit location
Location of unit
1. Locate the appliance 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
flow. Under no circumstances is the manufacturer to be
held responsible for water damage in connection with
this appliance, or any of its components.
2. The appliance must be installed indoors where it is
protected from exposure to wind, rain and weather.
3. The appliance must be installed so that the ignition
system components are protected from water (dripping,
spraying, rain, etc.,) during appliance operation and
service (circulator replacement, control replacement,
etc.,).
Installation & Service Manual
14 "
TOP
6" REAR
24"
FRONT
24"
LEFT
6"
RIGHT
4. Appliances located in a residential garage and in adjacent
spaces that open to the garage and are not part of the
living space of a dwelling unit must be installed so that
all burners and burner ignition devices have a minimum
clearance of not less than 18” (46cm) above the floor.
The appliance must be located or protected so that it is
not subject to physical damage by a moving vehicle.
5. DO NOT install this appliance in any location where
gasoline or flammable vapors are likely to be present.
6. All units have been approved for alcove installation (an
ALCOVE is a closet enclosure without a front door).
7. The appliance must not be installed on carpet.
8. All units have been approved for use on combustible
surfaces.
9. Allow sufficient space for servicing pipe connections,
pump and other auxiliary equipment, as well as the
appliance.
NOTICE
Clearances from combustible construction
are noted on the appliance rating plate.
Figure 1-1_Alcove installation, 90,000 - 180,000 Btu/hr
29"
TOP
6" RIGHT
6"
REAR
24"
FRONT
24"
LEFT
10
Figure 1-2_Alcove Installation , 225,000 - 500,000 Btu/hr
Installation & Service Manual
1 Determine unit location (continued)
Combustion and ventilation air requirements
for conventionally vented appliances
Provisions for combustion and ventilation air must be in
accordance with the latest edition of the National Fuel Gas
Code, ANSI Z223.1, in Canada, the latest edition of CGA
Standard B149 Installation Code for Gas Burning Appliances
and Equipment, or applicable provisions of the local building
codes.
The room where the appliance is installed MUST be provided
with properly sized openings to assure adequate combustion
air and proper ventilation when the appliance is installed with
conventional venting.
Figure 1-4_Combustion Air Through Ducts
2. If combustion and ventilation air is taken from the
outdoors using a duct to deliver the air to the room where
the appliance is installed, each of the two openings should
be sized based on a minimum free area of one square inch
per 2000 Btu/hr (11cm2 per kW) (see FIG. 1-4).
Figure 1-3_Combustion Air Direct from Outside
1. If air is taken directly from outside the building
with no duct, provide two permanent openings
(see FIG. 1-3):
(a) Combustion air opening, with a minimum free
area of one square inch per 4000 Btu/hr input
(5.5 cm2 per kW). This opening must be located
within 12" (30 cm) of the floor.
(b) Ventilation air opening, with a minimum free
area of one square inch per 4000 Btu/hr input
(5.5 cm
located within 12" (30 cm) of the ceiling.
2
per kW). This opening must be
Figure 1-5_Combustion Air from Interior Space
3. If air is taken from another interior space that is adequately
ventilated, each of the two openings specified above should
have a net free area of one square inch for each 1000 Btu/
hr (22cm2 per kW) of input, but not less than 100 square
inches (645cm2) (see FIG. 1-5).
11
1 Determine unit location
Installation & Service Manual
Figure 1-6_Combustion Air from Outside Single Opening
4. If a single combustion air opening is provided to bring
combustion air in directly from the outdoors, the
opening must be sized based on a minimum free area of
one square inch per 3000 Btu/hr (7 cm2 per kW). This
opening must be located within 12" (30 cm) of the top of
the enclosure (see FIG. 1-6).
Combustion air require ments are based on the latest edition
of the National Fuel Gas Code, ANSI Z223.1, in Canada
refer to National Standard CAN B149.1. Check all local code
re quire ments for combustion air.
All dimensions are based on net free area in square inch es.
Metal louvers or screens reduce the free area of a combustion
air opening a minimum of approximately 25%. Check with
louver manufacturers for exact net free area of louvers.
Where two openings are pro vid ed, one must be within
12" (30 cm) of the ceiling and one must be within
12" (30 cm) of the floor of the room where the appliance is
installed. Each opening must have a net free area as specified
in Table 1B (on page 13). Single openings shall be located
with in 12" (30 cm) of the ceiling.
CAUTION
The combustion air supply must be completely free of any
flammable vapors that may ignite or chemical fumes which
may be corrosive to the appliance. Common corrosive
chemical fumes which must be avoided are fluorocarbons
and other halogenated compounds, most commonly present
as refrigerants or solvents, such as freon, tricholorethylene,
perchlorethylene, chlorine, etc. These chemicals, when burned,
form acids which quickly attack the heat exchanger finned
tubes, headers, flue collectors, and the vent system. The result
is improper combustion and a non-warrantable, premature
appliance failure.
The result is improper combustion and a non-warrantable,
premature appliance failure.
EXHAUST FANS: Any fan or equipment which exhausts air
from the equipment room may deplete the combustion air
supply and/or cause a downdraft in the venting system. Spillage
of flue products from the venting system into an occupied
living space can cause a very hazardous condition that must be
immediately corrected. If a fan is used to supply combustion
air to the equipment room, the installer must make sure that it
does not cause drafts which could lead to nuisance operational
problems with the appliance.
Under no circumstances should the room
where the appliance is installed ever be
under a negative pressure. Particular care
should be taken where exhaust fans, attic
fans, clothes dryers, compressors, air
handling units, etc., may take away air from
the appliance.
12
Installation & Service Manual
1 Determine unit location (continued)
TABLE - 1B
MINIMUM RECOMMENDED COMBUSTION
AIR SUPPLY TO EQUIPMENT ROOM
Input
Btu/hr
90,000
135,000
180,000
199,999
225,000
270,000
315,000
360,000
399,999
500,000
*Outside Air from
2 Openings Directly from
Outdoors
Top
Opening, in
23
(148 cm2)
34
(220 cm2)
45
(291 cm2)
50
(323 cm2)
57
2
(368 cm
(439 cm
(510 cm
(581 cm2)
(646 cm2)
(807 cm2)
68
79
90
100
125
)
2
)
2
)
Bottom
2
Opening, in
(148 cm2)
(220 cm2)
(291 cm2)
(323 cm2)
(368 cm2)
(439 cm2)
(510 cm2)
(581 cm2)
(646 cm2)
(807 cm2)
23
34
45
50
57
68
79
90
100
125
*Outside Air from
1 Opening Directly
from Outdoors, in
2
30
(194 cm2)
45
(291 cm2)
60
(388 cm2)
67
(433 cm2)
75
(484 cm2)
90
(581 cm2)
105
(678 cm2)
120
(775 cm2)
134
(865 cm2)
167
(1,078 cm2)
*Outside Air from
2 Ducts Delivered from
Outdoors
2
Top
Opening, in
(291 cm2)
(439 cm2)
(581 cm2)
(646 cm2)
(730 cm2)
(871 cm2)
(1,020 cm2)
(1,162 cm2)
(1,291 cm2)
(1,613 cm2)
2
45
68
90
100
113
135
158
180
200
250
Bottom
Opening, in
45
(291 cm2)
68
(439 cm2)
90
(581 cm2)
100
(646 cm2)
113
(730 cm2)
135
(871 cm2)
158
(1,020 cm2)
180
(1,162 cm2)
200
(1,291 cm2)
250
(1,613 cm2)
**Inside Air from
2 Ducts Delivered from
Interior Space
Top
2
Opening, in
(646 cm2)
(871 cm2)
(1,162 cm2)
(1,291 cm2)
(1,452 cm2)
(1,742 cm2)
(2,033 cm2)
(2,323 cm2)
(2,581 cm2)
(3,226 cm2)
100
135
180
200
225
270
315
360
400
500
2
Bottom
Opening, in
100
(646 cm2)
135
(871 cm2)
180
(1,162 cm2)
200
(1,291 cm2)
225
(1,452 cm2)
270
(1,742 cm2)
315
(2,033 cm2)
360
(2,323 cm2)
400
(2,581 cm2)
500
(3,226 cm2)
2
*Outside air openings shall directly communicate with the outdoors. When combustion air is drawn from the outside through a
duct, the net free area of each of the two openings must have twice (2 times) the free area required for Outside Air/2 Openings.
The above requirements are for the boiler only; additional gas fired appliances in the equipment room will require an increase
in the net free area to supply adequate combustion air for all appliances.
**Combined interior space must be 50 cubic feet per 1,000 Btu/hr input. Buildings MUST NOT be of *“Tight Construction”.
For buildings of *“Tight Construction”, provide air openings into the building from outside.
*No combustion air openings are needed when the water heater is installed in a space with a volume NO LESS than 50 cubic feet
per 1,000 Btu/hr of all installed gas fired appliances. Buildings MUST NOT be of *“Tight Construction”.
* “Tight Construction” is defined as a building with less than 0.40 ACH (air changes per hour).
Vent installations for connection to gas vents or
chimneys must be in accordance with “Vent ing of Equipment,”
of the latest edition of the Na tion al Fuel Gas Code, ANSI
Z223.1, in Canada, the latest edi tion of CGA Standard B149
Installation Code for Gas Burning Appliances and Equipment
or applicable pro vi sions of the local building codes.
Adequate combustion and ventilation air must be
sup plied to the room where the appliance is installed in
accordance with the latest edition of the National Fuel Gas
Code, ANSI Z223.1, in Canada, the latest edition of CGA
Standard B149 Installation Code for Gas Burning Ap pli anc es
and Equipment, or applicable pro vi sions of the local building
codes.
13
2 Venting
The distance of the vent terminal from adjacent
build ings, windows that open and building open ings MUST
comply with the latest edition of the National Fuel Gas
Code, ANSI Z223.1, in Canada, the latest edition of CGA
Standard B149 In stal la tion Code for Gas Burn ing Appliances
and Equipment.
Vent connection is made directly to the top of the
ap pli ance. This appliance is designed with a built-in draft
diverter. No additional external draft hood is re quired. The
connection from the appliance vent to the common vent or
chimney must be made as direct as possible.
A Conventional Negative Draft
Venting System
The negative draft in a conventional vent in stal la tion must be
within the range of a negative 0.02 to 0.05 inches water column
to ensure proper operation. All draft read ings are made while
the appliance is in stable op er a tion (approximately 2 to 5
minutes).
Multiple appliance installations with combined vent ing or
common venting with other negative draft ap pli anc es require
that each appliance must have draft with in the proper range.
If the draft mea sured above the appliance’s built-in draft
diverter ex ceeds the specified range in a dedicated chimney
for a single appliance installation or in combined venting with
other negative draft appliances, a baro met ric damper must be
in stalled to control draft.
Installation & Service Manual
Figure 2-1_Conventional Negative Draft Vertical Venting
TABLE - 2A
VENT PIPE SIZES
Input Btu/hr Flue Size
90,000 5"
135,000 6"
180,000 7"
199,999 7"
225,000 7"
270,000 8"
315,000 8"
360,000 9"
399,999 10"
500,000 10"
14
On a conventionally vented, negative draft ap pli ance, the
connection from the vent to the chimney or vent termination
on the outside of the building MUST be made with listed Type
“B” double wall (or equivalent) vent connectors and must be
direct as possible with no reduction in diameter. To properly
size all double wall vent connectors and stacks, use the venting
tables in the latest edition of the National Fuel Gas Code, ANSI
Z223.1, in Canada, the latest edition of CGA Standard B149
Installation Code for Gas Burning Appliances and Equipment.
The Type “B” vent and accessories, such as firestop spacers,
thim bles, caps, etc., MUST be installed in accordance with the
manufacturer’s list ing. The vent connector and firestop must
provide correct spacing to combustible surfaces and seal to the
vent connector on the upper and lower sides of each floor or
ceiling through which the vent connector passes.
Any vent materials used must be listed by a na tion al ly recognized
test agency for use as vent ma te ri al.
2 Venting (continued)
Locate appliance as close as possible to a chimney or gas vent.
Avoid long horizontal runs of the vent pipe, 90° el bows,
reductions and restrictions. Horizontal por tions of the
venting system shall be supported to prevent sagging.
Horizontal runs must slope up wards not less than 1/4 inch
per foot (21 mm/m) from the appliance to the vent terminal.
Follow manufacturer’s instructions.
Do not use an existing chimney as a raceway for a flue pipe if
another appliance or fireplace is vented through the chimney.
A water heater shall not be connected to a chimney flue
serving a separate appliance designed to burn solid fuel.
The weight of the venting system must not rest on the
appliance. Adequate support of the venting sys tem must be
provided in compliance with local codes and other applicable
codes. All connections should be secured with rustproof
sheet metal screws.
Vent connectors serving appliances vented by nat u ral draft
shall not be connected to any portion of a me chan i cal draft
system operating under positive pres sure. Connection to
a positive pressure chim ney may cause flue products to be
discharged into the living space causing serious health injury.
Common venting systems may be too large when an existing
appliance is removed. At the time of removal of an existing
appliance, the following steps shall be followed with each
appliance remaining connected to the common venting
system placed in operation, while other appliances remaining
con nect ed to the common venting system are not in operation.
Installation & Service Manual
(e) Test for spillage at the draft hood/relief opening after
5 minutes of main burner operation. Use the flame of
a match or candle, or smoke from a cigarette, cigar or
pipe.
(f) 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, fireplace dampers
and other gas burning ap pli anc es to their previous
conditions of use.
(g) Any improper operation of the common venting
system should be corrected so that the installation
conforms to the latest edition of the Na tion al Fuel Gas
Code, ANSI Z223.1. In Canada, the latest edition of
CGA Standard B149 Installation Code for Gas Burning
Appliances and Equipment. When resizing any
por tion of the common venting system, the common
venting system should be resized to ap proach the
min i mum size as determined using the appropriate
tables in Part 11 in the latest edition of the National
Fuel Gas Code, ANSI Z223.1. In Canada, the latest
edition of CGA Stan dard B149 Installation Code for
Gas Burning Appliances and Equipment.
(a) Seal any unused opening in the common venting
system.
(b) Visually inspect the venting system for proper size
and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
(c) Insofar as 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 other
appliances 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
ex haust fan. Close fireplace dampers.
(d) Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust thermostat
so appliance will operate continuously.
15
2 Venting
Y
Vertical Vent Termination Clearances
10' OR LESS
CHIMNEY
Installation & Service Manual
10' OR LESS
10' OR LESS
2' MIN
RIDGE
3' MIN
Figure 2-2_Vent Termination from Peaked Roof 10' or
Less from Ridge
MORE THAN 10'
10'
2' MIN
RIDGE
CHIMNE
3' MIN
2' MIN
CHIMMEY
WALL OR
PARAPET
2' MIN
3' MIN
CHIMMEY
Figure 2-4_Vent Termination from Flat Roof 10' or
Less from Parapet Wall
10' OR MORE
3'
NOTE:
NO HEIGHT ABOVE
PARAPET REQUIRED
WHEN DISTANCE
FROM WALLS OR
PARAPETS IS MORE
THAN 10'.
Figure 2-3_Vent Termination from Peaked Roof More
than 10' from Ridge
The vent terminal should be vertical and exhaust outside the
building at least 2 feet (0.61m) above the high est point of the
roof within a 10 foot (3.05m) radius of the termination. The
vertical termination must be a minimum of 3 feet (0.91m)
above the point of exit.
A vertical terminal less than 10 feet (3.05m) from a parapet
wall must be a minimum of 2 feet (0.61m) higher than the
parapet wall.
The vent cap should have a minimum clearance of 4 feet
(1.22m) horizontally from and in no case above or below,
unless a 4 foot (1.22m) horizontal distance is maintained from
electric meters, gas meters, reg u la tors and relief equipment.
The venting system shall terminate at least 3 feet (0.9m) above
any forced air inlet within 10 feet (3.05m).
The venting system shall terminate at least 4 feet (1.2m)
below, 4 feet (1.2m) horizontally from, or 1 foot (30cm) above
any door, window or gravity air inlet into any building.
Do not terminate the vent in a window well, stair well, alcove,
courtyard or other recessed area.
16
WALL OR
PARAPET
CHIMNEY
Figure 2-5_Vent Termination from Flat Roof More Than
10' from Parapet Wall
The vent can not terminate below grade. The bot tom of the
vent terminal shall be located at least 12 inches (30cm) above
grade.
To avoid a blocked vent condition, keep the vent cap clear of
snow, ice, leaves, debris, etc.
Flue gases will form a white plume in winter. Plume could
obstruct window view.
Flue gas condensate can freeze on exterior sur fac es or on the vent
cap. Frozen condensate on the vent cap can result in a blocked
vent condition. Flue gas condensate can cause discoloration of
exterior build ing surfaces. Adjacent brick or masonry sur fac es
should be protected with a rust resistant sheet metal plate.
NOTICE
Examine the venting system at least once
a year. Check all joints and vent pipe
con nec tions for tightness. Also check for
corrosion or de te ri o ra tion. Immediately
correct any problems ob served in the
venting system.
2 Venting (continued)
Installation & Service Manual
Masonry Chimney Installation
A masonry chimney must be properly sized for the installation
of a gas fired appliance. Venting of an appliance into a cold
or oversized masonry chimney can result in op er a tion al and
safety problems. Exterior masonry chim neys, with one or
more sides exposed to cold out door tem per a tures, are more
likely to have venting problems. The temperature of the flue
gases from an appliance may not be able to suf fi cient ly heat
the ma son ry structure of the chim ney to generate proper
draft. This will result in condensing of flue gases, damage
the masonry flue/tile, insufficient draft and possible spill age
of flue gases into an occupied living space. Care ful ly in spect
all chimney systems before installation. If there is any doubt
about the sizing or condition of a masonry chimney, it must
be relined with a prop er ly sized and approved chimney liner
system.
Inspection of a Masonry Chimney
A masonry chimney must be carefully inspected to determine
its suitability for the venting of flue gas es. A clay tile lined
chimney must be structurally sound, straight and free of
misaligned tile, gaps between liner sections, missing sections
of liner or any signs of con den sate drainage at the breaching
or clean out. If there is any doubt about the condition of a
masonry chimney, it must be relined. An unlined masonry
chimney must not be used to vent flue gases from this
appliance. An unlined chimney must be relined with an
approved chimney liner system when a new appliance is be ing
attached to it. Metallic liner systems (Type “B” double wall
or flexible or rigid metallic liners) are recommended. Consult
with local code officials to determine code requirements or
the advisability of using or relining a masonry chimney.
Sidewall Venting
This appliance is NOT approved for sidewall venting with
the negative draft venting system as shipped from the factory.
An induced draft fan MUST be used if the installation
requires that the flue gases be vented out a sidewall. A
properly sized and in stalled induced draft fan may also be
used to vent the flue gases ver ti cal ly if required by job site
conditions. The induced draft fan must be listed by a nationally
recognized test agency, be properly sized and installed per the
rec om men da tions of the in duced draft fan manufacturer and
meet local code requirements. Use care to ensure that the
me chan i cal ly supplied draft does not exceed the range of a
negative 0.02 to 0.05 inches water column to ensure proper
operation. If draft exceeds the spec i fied range, the fan must be
adjusted or the installation of a baro met ric damper in the flue
may be required to prop er ly control draft.
An induced draft fan MUST be interlocked into the appliance’s
control circuit to start when the appliance calls for heat. The
in duced draft fan MUST also be equipped with a prov ing
switch, properly interlocked into the ap pli ance’s con trol
circuit to prove fan operation before the main burn ers are
allowed to fire. A vertical or sidewall vent termination for an
induced draft fan MUST be in stalled per the recommendations
of the fan manufacturer and provide proper clearances from
any combustion or ventilation openings, win dows, doors or
other open ings into the building. All induced draft fan in stalla tions must comply with local code requirements. See FIG.
2-7 for minimum sidewall venting clearances.
Fan Assisted Venting
A Power Venter kit is available on models 90,000 - 135,000
Btu/hr, water heaters only.
TABLE 2B - VENT MATERIALS
Kit
Number
100157734
Minimum Vent Length = 12 Equivalent Feet *
Maximum Vent Length = 25 Equivalent Feet * *
CAUTION
NOTE: In Canada, CPVC and PVC vent pipe, ttings and
cement/primer must be ULC-S636 certi ed.
WARNING
Figure 2-6_CW135 with Fan Assisted Venting
Input
Btu / hr
90,000 CPVC Rated
135,000 CPVC Rated
(ALL UNITS)
(ALL UNITS)
*Equivalent Feet: 90° Elbow = 5 Feet
45° Elbow = 3 Feet
DO NOT use Radel or cellular (foam) core
PVC or CPVC pipe.
DO NOT insulate PVC or CPVC venting
materials. Use of insulation will cuase
increased vent wall temperatures, which
could result in vent pipe failure.
Material
17
2 Venting
Figure 2-7 Other than Direct Vent Terminal Clearances
Installation & Service Manual
Table 2C Other than Direct Vent Terminal Clearances
Canadian Installations¹ US Installations²
A =
B =
C =
D =
E = Clearance to unventilated soffit
F = Clearance to outside corner
G = Clearance to inside corner
H =
Clearance above grade, veranda, porch,
deck, or balcony
Clearance to window or door that may
be opened
Clearance to permanently closed
window
Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 2 ft (61 cm) from
the center line of the terminal.
Clearance to each side of center line
extended above meter / regulator
assembly
6 in (15 cm) for appliances < 10,000 Btuh
(3 kW), 12 in (30 cm) for appliances >
10,000 Btuh (3 kW) and < 100,000 Btuh
(30 kW), 36 in (91 cm) for appliances >
12 in (30 cm) 12 in (30 cm)
4 ft (1.2 m) below or to side of opening; 1 ft
(300 mm) above opening
100,000 Btuh (30 kW)
**
**
**
**
**
**
18
Installation & Service Manual
2 Venting (continued)
Table 2C Other than Direct Vent Terminal Clearances (continued)
I =
J =
K =
L =
M =
Clearance to service regulator vent
outlet
Clearance to nonmechanical air supply
inlet to building or the combustion air
inlet to any other appliance
Clearance to a mechanical air supply
inlet
Clearance above paved sidewalk or
paved driveway located on public
property
Clearance under veranda, porch, deck,
or balcony
Above a regulator within 3 ft (91 cm)
horizontally of the vertical center line of the
regulator vent outlet to a maximum vertical
distance of 15 ft (4.5 m)
6 in (15 cm) for appliances < 10,000 Btuh
(3kW), 12 in (30 cm) for appliances >
10,000 Btuh (3 kW) and < 100,000 Btuh
(30 kW), 36 in (91 cm) for appliances >
100,000 Btuh (30 kW)
6 ft (1.83 m) 3 ft (91 cm) above if within 10 ft (3 m)
7 ft (2.13 m)† 7 ft (2.13 m)
12 in (30 cm)‡ *
4 ft (1.2 m) below or to side of opening; 1 ft
(300 mm) above opening
*
horizontally
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
† 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 he oor.
NOTES:
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
19
2 Venting
Installation & Service Manual
Automatic Vent Damper
This heating boiler is design certified for use with the automatic
vent damper (FIG. 2-8) part number printed on the boiler’s
rating plate. A vent damper is optional on heating boilers above
360,000 Btu/hr. Automatic vent dampers are not required or
fur nished on potable water heaters. Water heaters with inputs
of 360,000 Btu/hr and less may be ordered with the vent damp er
as an option. A vent damper is a useful tool for saving energy
when installed inside the living space where air can cir cu late
freely around the appliance. The vent damper will not save as
much, if any, energy if it is installed in locations such as:
- Unheated garage
- Attic
- Crawlspace
- Mechanical room that is vented outdoors
For installation and maintenance on the vent damper, refer to
the instructions supplied with the vent damper.
Larger input heating boilers and water heaters will have a
jumper plug installed in the ter mi nal block to allow operation
without a damper. Remove the jumper plug from the terminal
block to connect an optional vent damper wire harness (water
heater shown in FIG. 2-9). The jumper plug MUST be in place
if an optional vent damper is not used on water heaters and
larger input heating boilers.
Figure 2-8_CB with Vent Damper and Vent Damper
Terminal Block
VENT DAMPER
TERMINAL
BLOCK
Figure 2-9_CW with Vent Damper
VENT DAMPER
WARNING
DANGER
The damper position indicator must be in a visible
lo ca tion with access for service following in stal la tion. The
damper must be in an open position when appliance main
burners are operating.
The part number for the automatic vent damper required
on this heating boiler is printed on the rating plate. Vent
damper regulations are design certified per the latest edition of
ANSI Z21.66.
Do not install the vent damper within 6"
(152 mm) of combustible materials.
Install the vent damper to service only the
single ap pli ance for which it is intended.
If improperly installed, a hazardous
condition such as an ex plo sion or carbon
monoxide poisoning could result.
WARNING
CAUTION
The vent damper must be installed directly
on the flue outlet located on the top of
the draft hood (see FIG. 2-8). Do not alter
the wire har ness sup plied with the vent
damper. Follow the instructions supplied
with the vent damper.
An appliance which is shut down or will
not operate may experience freezing due to
con vec tive air flow down the flue pipe
connected to the unit. Proper freeze
protection must be pro vid ed, see Freeze
Pro tec tion in the Startup Section of this
manual.
20
3 Gas connections
Gas Supply
Installation & Service Manual
Gas Pressure Test
Verify that the appliance is supplied with the type gas
spec i fied on the rating plate. This appliance is orificed for
operation up to 2000 feet altitude. The ap pli ance will be
derated 4% per 1000 feet above 2000 feet el e va tion. Consult
the factory for installations above 2000 feet elevation. Field
conversions for operation at high altitude must be performed
by certified per son nel only. The appliance will be marked to
indicate suitability for high al ti tude operation.
GAS SUPPLY PRESSURE: Measured at the inlet pressure tap located upstream of the combination gas valve(s)
see FIG.’s 3-5 and 3-6, page 25.
TABLE - 3A
GAS SUPPLY PRESSURE
Natural Gas LP Gas
Max. (Inches Water Column)
Min. (Inches Water Column) *4.5 11
Min. (Inches Water Column) **5.0 11
*Models 90,000 - 360,000 Btu/hr Only
**Models 399,999 - 500,000 Btu/hr Only
Maximum inlet gas pressure must not exceed the val ue
specified. Minimum value listed is for the purposes of input
adjustment.
MANIFOLD PRESSURE: Measured at the pres sure tap
on the downstream side of the com bi na tion gas valve(s)
(see FIG.’s 3-5 and 3-6, page 25). The gas regulator settings
for single stage and two stage operation are factory set to
supply proper manifold pressure for normal operation. To
check manifold pressure, see Manifold Ad just ment Procedure.
Do not increase manifold pressure beyond spec i fied pressure
settings shown below in Table 3B.
14 14
1. The appliance must be disconnected from the gas supply
piping system during any pressure testing of that system at
a test pressure in excess of 1/2 PSIG (3.5kPa).
2. The appliance must be isolated from the gas supply piping
system by closing a manual shutoff valve during any
pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 PSIG (3.5kPa).
3. The appliance and its gas connection must be leak-tested
before placing it in operation.
Gas Connection
1. Safe operation of the appliance requires properly sized gas
supply piping.
2. Gas pipe size may be larger than appliance gas connection.
3. Installation of a union is suggested for ease of service, see
FIG. 3-1 on page 22.
4. Install a manual main gas shutoff valve, outside of the
appliance gas connection and before the gas valve or
manifold connection, when local codes require.
5. A trap (drip leg) MUST be provided by the installer in
the inlet of the gas connection to the appliance, see
FIG. 3-1 on page 22.
6. The combination gas valve has an integral vent lim it ing
device and does not require venting to atmosphere,
outside the building.
7. Optional gas controls may require routing of bleeds and
vents to the atmosphere, outside the building when
required by local codes.
TABLE - 3C
FITTINGS TO EQUIVALENT STRAIGHT PIPE
Diameter Pipe (inches)
TABLE - 3B
MANIFOLD PRESSURE
Input Gas
Btu/hr
90,000 - 180,000 3.5" 10" 0.9" 2.5"
199,999 2.9" 7.5" 0.9" 2.5"
215,000 - 399,999 3.5" 10" 0.9" 2.5"
500,000 3.5"
Single and Two-Stage Two Stage
Full or High Fire Settings Low Fire Settings
Natural Gas LP Gas Natural Gas LP Gas
10"
(two valves)
N/A N/A
3/4 1 1 1/4 1 1/2 2 3 4 5
Equivalent Length of Straight Pipe (feet)
22345101420
TABLE - 3D
GAS CONNECTIONS
Btu/hr
INPUT
90,000 - 135,000 1/2"
180,000 - 315,000 3/4"
360,000 - 500,000 1
Pipe Size
21
3 Gas connections
Capacity of Schedule 40 Metallic Pipe in Cubic Feet of Natural Gas Per Hour
(based on .60 specific gravity, 0.30" w.c. pressure drop)
Pipe
Size
(Inches)
1/2 131 90 72 62 55 N/A N/A N/A N/A N/A N/A N/A N/A N/A
3/4 273 188 151 129 114 104 95 89 83 79 70 63 58 N/A
1 514 353 284 243 215 195 179 167 157 148 131 119 109 102
1 1/4 1,060 726 583 499 442 400 368 343 322 304 269 244 224 209
1 1/2 1,580 1,090 873 747 662 600 552 514 482 455 403 366 336 313
2 3,050 2,090 1,680 1,440 1,280 1,160 1,060 989 928 877 777 704 648 602
2 1/2 4,860 3,340 2,680 2,290 2,030 1,840 1,690 1,580 1,480 1,400 1,240 1,120 1,030 960
3 8,580 5,900 4,740 4,050 3,590 3,260 3,000 2,790 2,610 2,470 2,190 1,980 1,820 1,700
4 17,500 12,000 9,660 8,270 7,330 6,640 6,110 5,680 5,330 5,040 4,460 4,050 3,720 3,460
10 20 30 40 50 60 70 80 90 100 125 150 175 200
Installation & Service Manual
TABLE - 3E
Length of Pipe in Straight Feet
Gas Piping
GAS VALVE
GAS SHUTOFF
TRAP
( DRIP LEG )
Figure 3-1_Gas Line Connection
All gas connections must be made with pipe joint
com pound resistant to the action of liquefied pe tro leum and
natural gas. All piping must comply with local codes. Tubing
installations must com ply with ap proved standards and
practices. Reference FIG. 3-1 for a typical installation.
Install Piping to Control
1. The gas line should be a separate line direct from the
meter unless the existing gas line is of sufficient capacity.
Verify pipe size with your gas sup pli er.
UNION
2. Use new, properly threaded black iron pipe free from
chips. If tubing is used, make sure the ends are cut
squared, deburred and clean. All tubing bends must be
smooth and without deformation. Avoid flexible gas
connections. Internal diameter of flexible lines may not
provide proper volume of gas.
3. Run pipe or tubing to the gas valve or manifold inlet. If
tubing is used, obtain a tube to pipe coupling to connect
the tubing to the gas valve or man i fold inlet.
4. DO NOT OVER TIGHTEN. Over tightening may result in
damage to the gas valves. Valve distortion or malfunction
may result if the pipe is inserted too deeply into the gas
valve.
5. Apply a moderate amount of good quality pipe compound
(DO NOT use Teflon tape) to pipe only, leaving two end
threads bare.
6. Remove seal over gas valve or manifold inlet.
7. Connect pipe to gas valve or manifold inlet. Use wrench
to square ends of the gas valve (FIG. 3-2).
8. For L.P. gas, consult your L.P. gas supplier for expert
installation.
22
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