State SBB75 76NE User Manual
MODELS SBB75 76NE
Series 100
COMMERCIAL ULTRA LOW NOx GAS WATER HEATER
Glass-Lined Tank-type Water Heater
• INSTALLATION • OPERATION • SERVICE • MAINTENANCE • LIMITED WARRANTY
CAUTION
TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION
RELATIVE TO YOUR SAFETY. PLEASE READ THOROUGHLY
BEFORE INSTALLING AND USING THIS APPLIANCE.
500 Tennessee Waltz Parkway
Ashland City, TN 37015
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
PRINTED IN U.S.A. 1212 PART NO. 325369-000
AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
1
TABLE 1, DIMENSIONS
ROUGH-IN DIMENSIONS
TOP VIEW
*INSTALL IN ACCORDANCE WITH LOCAL CODES
FIGURE 1.
Units A B C D E F G H J K L M
Inches
CM
TABLE 2, RECOVERY RATINGS
INPUT RATE Recovery in US Gallons/hr or Liters/hr at Indicated Temperature Rise in Fahrenheit or Celsius
75,100 BTU/H
22 KW
Recovery ratings are based on 80% thermal efciency.
66 5/8
169.22
58 3/4
134.23
°F 30 40 50 60 70 80 90 100 110 120 130 140
GPH 243 182 145 122 104 91 81 73 66 60 56 52
°C 17 23 28 33 39 44 50 56 61 67 72 78
LPH 920 688 549 460 392 344 306 277 251 228 213 199
TABLE 3, GAS AND ELECTRICAL CHARACTERISTICS
30 15/16
78.58
27 3/4
70.5
15 1/4
38.6
4
10.2
15 3/4
40.0
16
40.6
1 1/4
3.2
1 1/4
NPT
NPT
Manifold Pressure Electrical Characteristics
Type of gas Inches W.C. kPa Voltz/Hz Amperes
Natural Gas 4.0 1.12 120/160 <5
All Models: Maximum supply pressure = 14.0 in. W.C. (3.48 kPa)
Minimum supply pressure, Natural gas = 6 in. W.C. (1.49 kPa).
Minimum pressures must be maintained under both load and no load (static and dynamic) conditions.
FOREWORD
The design of model SBB75 76NE complies with the current edition of
ANSI Z21.10.3/CSA 4.3 as automatic storage or automatic circulating
tank type water heaters.
The installation must conform to these instructions and the local code
authority having jurisdiction.
In the absence of local codes, the installation must comply with the following:
In the United States:
Installation diagrams are found in this manual. These diagrams will serve
to provide the installer with a reference for the materials and method of
piping necessary. It is highly essential that all water and gas piping be
installed as shown on the diagrams.
In addition to these instructions, 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 shall be carefully followed
in all cases. Authorities having jurisdiction should be consulted before
installations are made.
Current edition of the National Fuel Gas Code, ANSI Z223.1 / NFPA 54
and the National Electrical Code, NFPA 70;
In Canada:
Current edition of the Installation Code CAN/CSA-B149.1 and the
Canadian Electrical Code CSA C22.1.
These are available from Canadian Standards Association, 8501 East
Pleasant Valley Road, Cleveland, OH 44131 or National Fire Protection
Association, 1 Batterymarch Park, Quincy, MA 02269.
2
1/2
12 1/4
31.1
TABLE OF CONTENTS
Page
ROUGH-IN DIMENSIONS ............................................................. 2
FOREWORD ................................................................................. 2
GENERAL SAFETY INFORMATION ............................................. 2-4
Precautions.................................................................................... 3
Grounding Instructions............................................................... 3
Chemical Vapor Corrosion ......................................................... 3
Extended Non-use Periods ........................................................ 3
Insulation Blankets..................................................................... 4
High Altitude Installations........................................................... 4
Circulating Pump ....................................................................... 4
INSTALLATION INSTRUCTIONS ................................................. 4-9
Required Ability.............................................................................. 4
Locating The Heater .................................................................. 4
Clearances................................................................................. 5
Hard Water ................................................................................ 5
Air Requirements ....................................................................... 5
Venting ....................................................................................... 6
Thermometers (Not Supplied) ................................................... 7
Combination Water (Potable) Heating and Space Heating ....... 7
Relief Valve ................................................................................ 7
Gas Piping ................................................................................. 7
Heater Wiring ............................................................................. 8
Wiring Diagram .......................................................................... 8
Purging ...................................................................................... 9
Gas Pressure Regulation.......................................................... 9
OPERATION ................................................................................. 9
Page
To Operate The Heater ............................................................. 9
Lighting Instructions .................................................................. 10
Temperature Regulation ........................................................... 11
Checking Venting ...................................................................... 11
High Temperature Limit Switch ................................................. 11
SERVICE INFORMATION ............................................................ 12-13
Main Burner and Igniter ............................................................ 12
Checking Gas Input .................................................................. 12
Vent System.............................................................................. 12
Blower Maintenance ................................................................. 13
Relief Valve ............................................................................... 13
Hot Water Odor ......................................................................... 13
Winter Protection ...................................................................... 13
Replacement Parts ................................................................... 13
PREVENTIVE MAINTENANCE .................................................... 13-14
Procedure for Periodic Removal Of Lime Deposits .................. 13
Deliming Solvents ..................................................................... 13
Tank Cleanout Procedure ......................................................... 14
CHECKLIST ................................................................................. 15-16
Condensation............................................................................ 15
Anode ....................................................................................... 15
Service & Repair ....................................................................... 16
TROUBLESHOOTING ................................................................. 17-20
NOTES ......................................................................................... 21-22
LIMITED WARRANTY ................................................................... 23
GENERAL SAFETY
INFORMATION
PRECAUTIONS
DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN UNDER
WATER. Immediately call a qualied service technician to inspect the
appliance and to replace any part of the control system and any gas
control which has been under water.
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT OPERATE
HEATER UNTIL ALL CORRECTIVE STEPS HAVE BEEN MADE BY A
QUALIFIED SERVICEMAN.
1. EXTERNAL FIRE.
2. DAMAGE.
3. FIRING WITHOUT WATER.
4. SOOTING.
Heater must be protected from freezing downdrafts during shutdown periods.
GROUNDING INSTRUCTIONS
This water heater must be grounded in accordance with the National
Electrical Code and/or local codes. These must be followed in all cases.
This water heater 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 water heater, see Figure 5.
CHEMICAL VAPOR CORROSION
WARNING
CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY OCCUR IF
AIR FOR COMBUSTION CONTAINS CERTAIN CHEMICAL VAPORS. SUCH
CORROSION MAY RESULT IN FAILURE AND RISK OF ASPHYXIATION.
Spray can propellants, cleaning solvents, refrigerator and air conditioning
refrigerants, swimming pool chemicals, calcium and sodium chloride (water
softener salt), waxes, and process chemicals are typical compounds which
are potentially corrosive. Do not store products of this sort near the heater.
Also, air which is brought in contact with the heater should not contain
any of these chemicals. If necessary, uncontaminated air should be
obtained from remote or outside sources. The limited warranty is voided
when failure of water heater is due to a corrosive atmosphere. (Refer to
the limited warranty for complete terms and conditions.)
EXTENDED NON-USE PERIODS
WARNING
HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM
SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG
PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE). HYDROGEN
GAS IS EXTREMELY FLAMMABLE. To reduce the risk of injury under
these conditions, it is recommended that the hot water faucet be opened
for several minutes at the kitchen sink before using any electrical appliance
connected to the hot water system. If hydrogen is present, there will
probably be an unusual sound such as air escaping through the pipe as
the water begins to ow. THERE SHOULD BE NO SMOKING OR OPEN
FLAME NEAR THE FAUCET AT THE TIME IT IS OPEN.
3
INSULATION BLANKETS
Insulation blankets available to the general public for external use
on gas water heaters are not required for use on your water heater.
The purpose of an insulation blanket is to reduce the standby heat
loss encountered with storage tank water heaters. Your water
heater meets or exceeds the current edition of ASHRAE/IES 90.1
standards with respect to insulation and standby loss requirement
making an insulation blanket unnecessary.
WARNING
Should you choose to apply an insulation blanket to this heater, you
should follow these instructions. Failure to follow these instructions
can result in fire, asphyxiation , serious personal injury or death.
• Do not apply insulation to the top of the water heater, as this will
interfere with safe operation.
• Do not cover the outer door, thermostat or temperature & pressure
relief valve.
• Do not allow insulation to come within 2" (5cm) of the oor to prevent
blockage of combustion air ow to the burner.
• Do not cover the instruction manual. Keep it on the side of the water
heater or nearby for future reference.
• Do obtain new warning and instruction labels from the manufacturer
for placement on the blanket directly over the existing labels.
• Do inspect the insulation blanket frequently to make certain it does
not sag, thereby obstructing combustion air ow.
HIGH ALTITUDE INSTALLATIONS
Water heaters covered in this manual have been tested and
approved for installation at elevations up to 7,700 feet (2,347
m) above sea level. For installation above 7,700 feet (2,347 m),
the water heater’s Btu input should be reduced at the rate of 4
percent for each 1,000 feet (305 m) above sea level which requires
replacement of the burner orifice in accordance with the National
Fuel Gas Code ANSI Z223.1/ NFPA 54. Contact your local gas
supplier for further information.
Failure to replace the standard orifice with the proper high altitude
orifice when installed at elevations above 7,700 feet (2,347 m)
could result in improper and inefficient operation of the water
heater, producing carbon monoxide gas in excess of the safe
limits. This could result in serious injury or death. Contact your
local gas supplier for any specific changes that may be required
in your area.
Upon completion of derating of the heater, adjustment to the
gas pressure regulator may be required. See CHECKING THE
INPUT section in this manual for inlet and manifold pressure
requirements.
Also due to the input rating reduction required at high altitudes,
the output rating of the appliance is also reduced and should be
compensated for in the sizing of the equipment for application.
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 heater.
Refer to the piping diagrams at rear of manual for electrical hookup
information and install in accordance with the current edition of the
National Electrical Code ANSI/NFPA No. 70. In Canada refer to
Canadian Electrical Code CSA C22.1.
Only all bronze circulating pumps are used with commercial
water heaters. Although circulators are oiled and operated by
the manufacturer some circulators must be oiled again before
operating. Please refer to manufacturer’s instructions.
INSTALLATION INSTRUCTIONS
REQUIRED ABILITY
INSTALLATION OR SERVICE OF THIS WATER HEATER
REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED
TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR
SUPPLY, VENTING, ELECTRICAL AND GAS SUPPLY WORK
ARE REQUIRED.
LO CATING T H E HEATER
WARNING
THERE IS A RISK IN USING FUEL BURNING APPLIANCES SUCH
AS GAS WATER HEATERS IN ROOMS, GARAGES OR OTHER
AREAS WHERE GASOLINE, OTHER FLAMMABLE LIQUIDS OR
ENGINE DRIVEN EQUIPMENT OR VEHICLES ARE STORED,
OPERATED OR REPAIRED. FLAMMABLE VAPORS ARE HEAVY
AND TRAVEL ALONG THE FLOOR AND MAY BE IGNITED BY THE
HEATER’S PILOT OR MAIN BURNER FLAMES CAUSING FIRE
OR EXPLOSION. SOME LOCAL CODES PERMIT OPERATION
OF GAS APPLIANCES IF INSTALLED 18 INCHES (45.7 CM) OR
MORE ABOVE THE FLOOR. THIS MAY REDUCE THE RISK IF
LOCATION IN SUCH AN AREA CANNOT BE AVOIDED.
DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A CARPETED
FLOOR. A FIRE HAZARD MAY RESULT. Instead the water heater must
be placed on a metal or wood panel extending beyond the full width
and depth by at least 3 inches (7.6 CM) in any direction. If the heater is
4
installed in a carpeted alcove or closet, the entire oor shall be covered
by the panel. Also, see the drain requirements.
THIS HEATER SHALL BE LOCATED OR PROTECTED SO IT IS
NOT SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
WARNING
FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY
OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST
NEVER BE PLACED ON OR ADJACENT TO THE HEATER. OPEN
CONTAINERS OF FLAMMABLE MATERIAL SHOULD NOT BE
STORED OR USED IN THE SAME ROOM WITH THE HEATER.
ATTIC AND/OR EXHAUST FANS OPERATING ON THE PREMISES
WARNING
WITH A WATER HEATER CAN RESULT IN CARBON MONOXIDE
POISONING AND DEATH.
OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE DRAFT IN
THE AREA OF THE WATER HEATER PREVENTING THE PRODUCTS
OF COMBUSTION FROM EXHAUSTING THROUGH THE CHIMNEY
OR VENT PIPE.
The venting of the water heater should be inspected by a qualied service
technician at the time of installation and periodically thereafter to ensure
a down-draft condition does not exist.
When installing the heater, consideration must be given to proper
location. Location selected should be as close to the stack or
chimney as practicable, with adequate air supply and as centralized
with the piping system as possible.
THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE IT
WILL BE SUBJECT TO FREEZING.
THE HEATER SHOULD BE LOCATED IN AN AREA WHERE
LEAK AGE FROM THE HEATER OR CONNECTIONS WILL NOT
RESULT IN DAMAGE TO THE ADJACENT AREA OR TO LOWER
FLOORS OF THE STRUCTURE.
WHEN SUCH LOCATIONS CANNOT BE AVOIDED, A SUITABLE
DRAIN PAN SHOULD BE INSTALLED UNDER THE HEATER. Such
pans should be fabricated with sides at least 2" (5cm) deep, with
length and width at least 2" (5cm) greater than the diameter of the
heater and must be piped to an adequate drain. The pan must not
restrict combustion air flow.
Drain pans suitable for these heaters are available from from the
manufacturer, authorized service agencies or distributors.
CLEARANCES
These heaters are approved for installation on combustible flooring
in a closet having a ceiling 12" (30.5cm) above top cover and with
clearances to combustible construction of 6" (15.2cm) from flue or
vent connector, 0" (0cm) at the sides and rear and 5" (10.2cm) to
front to prevent a possible fire hazard condition. A minimum of 4"
(10.2cm) shall be allowed for installation of serviceable parts.
WARNING
FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR COMBUSTION
AND VENTILATION. AN INSUFFICIENT SUPPLY OF AIR WILL CAUSE
RECIRCULATION OF COMBUSTION PRODUCTS RESULTING IN
AIR CONTAMINATION THAT MAY BE HAZARDOUS TO LIFE. SUCH
A CONDITION OFTEN WILL RESULT IN A YELLOW, LUMINOUS
BURNER FLAME, CAUSING CARBONING OR SOOTING OF THE
COMBUSTION CHAMBER, BURNERS AND FLUE TUBES AND
CREATES A RISK OF ASPHYXIATION.
Where an exhaust fan is supplied in the same room with a heater,
sufcient openings for air must be provided in the walls. UNDERSIZED
OPENINGS WILL CAUSE AIR TO BE DRAWN INTO THE ROOM
THROUGH THE CHIMNEY, CAUSING POOR COMBUSTION.
SOOTING MAY RESULT IN SERIOUS DAMAGE TO THE HEATER
AND RISK OF FIRE OR EXPLOSION.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATING
AIR. ADEQUATE AIR FOR COMBUSTION AND VENTILATION MUST
BE PROVIDED FOR SAFE OPERATION.
UNCONFINED SPACE
In buildings of conventional frame, brick, or stone construction,
unconned spaces may provide adequate air for combustion, ventilation
and draft hood dilution.
If the unconned space is within a building of tight construction (buildings
using the following construction: weather stripping, heavy insulation,
caulking, vapor barrier, etc.), air for combustion, ventilation and draft hood
dilution must be obtained from outdoors. The installation instructions
for conned spaces in tightly constructed buildings must be followed to
ensure adequate air supply.
HARD WATER
Where hard water conditions exist, water softening or the threshold
type of water treatment is recommended. This will protect
the dishwashers, coffee urns, water heaters, water piping and
other equipment.
See MAINTENANCE section for details of tank cleanout procedure.
AIR REQUIREMENTS
REFER TO CURRENT EDITION OF THE "NATIONAL FUEL GAS
CODE ANSI Z223.1/NFPA 54. FOR CANADA CONSULT CAN/
CSA- B149.1.
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLES, VAPORS
AND LIQUIDS.
DO NOT OBSTRUCT THE FLOW OF THE COMBUSTION OR
VENTILATING AIR.
CONFINED SPACE
When drawing combustion and dilution air from inside a conventionally
constructed building to a conned space, such a space shall be provided
with two permanent openings, ONE IN OR WITHIN 12 INCHES (30.5cm)
OF THE ENCLOSURE TOP AND ONE IN OR WITHIN 12 INCHES
(30.5cm) OF THE ENCLOSURE BOTTOM. Each opening shall have
a free area of at least one square inch per 1000 Btuh (2,225mm
2
/Kw) of
the total input of all appliances in the enclosure, but not less than 100
square inches (645 square cm).
If the conned space is within a building of tight construction, air for
combustion, ventilation, and draft hood dilution must be obtained
from outdoors. When directly communicating with the outdoors or
communicating with the outdoors through vertical ducts, two permanent
openings, located in the above manner, shall be provided. Each opening
shall have a free area of not less than one square inch per 4000 Btuh
(8,900mm
horizontal ducts are used, each opening shall have a free area of not
less than one square inch per 2000 Btuh (4,450mm
2
/Kw) of the total input of all appliances in the enclosure. If
2
/Kw) of the total input
of all appliances in the enclosure. For Canadian installations consult
CAN/CSA-B149.1.
5
VENTING
WARNING
THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST BE
FOLLOWED TO AVOID CHOKED COMBUSTION OR RECIRCULATION
OF FLUE GASES. SUCH CONDITIONS CAUSE SOOTING OR RISKS
OF FIRE AND ASPHYXIATION.
This water heater must be protected from freezing downdrafts.
Remove all soot or other obstructions from the chimney that will retard
a free draft.
Type B venting is recommended with these water heaters.
This water heater must be vented in compliance with all local codes, the
current edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54,
and with the Category I Venting Tables.
In Canada, venting shall conform to the requirements of the current
edition of the CAN/CSA B149.1-00 installation code.
If any part of the vent system are exposed to ambient temperatures below
35 degrees F (2 degrees C) it must be insulated to prevent condensation.
• Do not connect the heater to a common vent or chimney with solid
fuel burning equipment. This practice is prohibited by many local
building codes as is the practice of venting gas red equipment to
the duct work of ventilation systems.
• Where a separate vent connection is not available and the vent
pipe from the heater must be connected to a common vent with an
oil burning furnace, the vent pipe should enter the smaller common
vent or chimney at a point above the large vent pipe.
FIGURE 2.
VENT CONNECTION
Vent connections must be made to an adequate stack or chimney. Size
and install proper size vent pipe. Do not reduce pipe size to less than
that of the blower outlet.
Horizontal runs of vent pipe must have a minimum upward slope toward
the chimney of 1/4 inch per foot (2cm per meter). Dampers or other
obstructions must not be installed in between the heater and the blower.
Be sure that the vent pipe does not extend beyond the inside wall of
the chimney.
Where a continuous or intermittent back draft is found to exist, the
cause must be determined and corrected. A special vent cap may be
required. If the back draft cannot be corrected by the normal methods or
if a suitable draft cannot be obtained, a blower type ue gas exhauster
must be employed to assure proper venting and correct combustion.
SINGLE TEMPERATURE
MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER
WARNING
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE
USE TEMPERATURE AT FIXTURES. SEE TEMPERATURE
REGULATION ON PAGE 11. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY TO OBTAIN
ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD
VALVE FOR HOT WATER SUPPLIED TO FIXTURES.
CIRCULATING RETURN LINE CONNECTIONS
TEMPERED WATER LOOP, IF USED, CONNECT TO POINT "A".
STORED TEMPERATURE WATER LOOP, IF USED, CONNECT TO
COLD WATER INLET
VACUUM RELIEF
VALV E
*INSTALL PER
LOCAL CODES.
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACK-FLOW
PREVENTER, CHECK VALVE OR WATER METER WITH CHECK
VALVE, PROVISIONS FOR THERMAL EXPANSION OF WATER IN
THE HOT WATER SYSTEM MUST BE PROVIDED.
FIGURE 3.
6
THERMOMETERS (Not Supplied)
Thermometers should be obtained and field installed as shown in
Figure 3.
Thermometers are installed in the system as a means of detecting the
temperature of the outlet water supply.
COMBINATION WATER (POTABLE) HEATING
AND SPACE HEATING
1. All piping components connected to this unit for space heating
applications shall be suitable for use with potable water.
2. Toxic chemicals, such as those used for boiler treatment, shall
NEVER be introduced into this system.
3. This unit may NEVER be connected to any existing heating system
or component(s) previously used with a non-potable water heating
appliance.
4. When the system requires water for space heating at temperatures
higher than required for domestic water purposes, a tempering
valve must be installed. Please refer to installation diagram on
page 6 of this manual for suggested piping arrangements.
5. These water heaters cannot be used in space heating applications
only.
CAUTION
A closed system will exist if a check valve (without bypass), pressure
reducing valve (without bypass), or a water meter (without bypass)
is installed in the cold water line between the water heater and street
main (or well).
Excessive pressure may develop in such closed systems, causing
premature tank failure or intermittent relief valve operation. This is not a
warranty failure. An expansion tank or a similar device may be required
in the inlet supply line between the appliance and the meter or valve to
compensate for the thermal expansion of the water.
SYSTEM CONNECTIONS
The system installation must conform to these instructions and to the
local code authority having jurisdiction. Good practice requires that all
heavy piping be supported.
RELIEF VALVE
This water heater is equipped with a combination temperature-pressure
relief valve that complies with the standard for relief valves for hot water
supply systems Z21.22-CSA 4.4. FOR SAFE OPERATION OF THE
WATER HEATER, THE RELIEF VALVE(S) MUST NOT BE REMOVED
OR PLUGGED.
ASME ratings cover pressure relief capacities. ANSI ratings cover release
rate with temperature actuation.
In addition to the appliance relief valve, each remote storage tank
which may be used in conjunction with this appliance shall also be
installed with a properly sized, rated and approved combination
temperature (ANSI) and pressure (ASME) relief valve(s). This valve
shall comply with the standard for relief valves for hot water supply
systems Z21.22-CSA 4.4.
WARNING
THE PURPOSE OF RELIEF VALVE IS TO AVOID EXCESSIVE PRESSURE
OR TEMPERATURE INTO THE STEAM RANGE, WHICH MAY CAUSE
SCALDING AT FIXTURES, TANK EXPLOSION, SYSTEM OR HEATER
DAMAGE. NO VALVE IS TO BE PLACED BETWEEN THE
VALVE AND TANK.
RELIEF
Your local code authority may have other specific relief valve
requirements.
A DRAIN LINE MUST BE CONNECTED TO THE RELIEF VALVE TO
DIRECT DISCHARGE TO A SAFE LOCATION TO AVOID SCALDING OR
WATER DAMAGE. THIS LINE MUST NOT BE REDUCED FROM THE
SIZE OF THE VALVE OUTLET AND MUST NOT CONTAIN VALVES,
RESTRICTIONS NOR SHOULD IT BE LOCATED IN FREEZING AREAS.
DO NOT THREAD OR CAP THE END OF THIS LINE. RESTRICTED OR
BLOCKED DISCHARGE WILL DEFEAT THE PURPOSE OF THE VALVE
AND IS UNSAFE. DISCHARGE LINE SHALL BE INSTALLED TO ALLOW
COMPLETE DRAINAGE OF BOTH THE VALVE AND LINE.
See SERVICE INFORMATION section for procedure and precautions.
The type, size and location of the relief valves must be in accordance
with local codes. The location of the relief valve is shown in Figure 1.
The heater has a factory installed high temperature limit switch.
GAS PIPING
Contact your local gas service company to ensure that adequate gas service
is available and to review applicable installation codes for your area.
Size the main gas line in accordance with Table 4. The gures shown
are for straight lengths of pipe at 0.5 in. W.C. pressure drop, which is
considered normal for low pressure systems. Note: Fittings such as
elbows, tees and line regulators will add to the pipe pressure drop. Also
refer to the current edition of the National Fuel Gas Code. For Canadian
installations consult Canadian Installation Code CAN/CSA-B149.1.
WARNING
The minimum gas supply pressure for input adjustment is 6.0" kPa W.C.
for natural gas (11.0" kPa W.C. for propane).
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER THAN
14" kPa WATER COLUMN SUPPLY PRESSURE. EXPOSURE TO HIGHER
GAS SUPPLY PRESSURE MAY CAUSE DAMAGE TO THE CONTROL
WHICH COULD RESULT IN FIRE OF EXPLOSION. If overpressure has
occurred such as through improper testing of gas lines or emergency
malfunction of the supply system, the control must be checked for safe
operation. Make sure that the outside vents on the supply regulators
and the safety vent valves are protected against blockage. These are
parts of the gas supply system not the heater. Vent blockage may occur
during ice storms.
IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING FROM
CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE
IMPROPER OPERATION, FIRE OR EXPLOSION.
IF COPPER SUPPLY LINES ARE USED THEY MUST BE INTERNALLY
TINNED AND CERTIFIED FOR GAS SERVICE. BEFORE ATTACHING THE
GAS LINE, BE SURE THAT ALL GAS PIPE IS CLEAN ON THE INSIDE.
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS SUPPLY
LINE, A DIRT LEG (SOMETIMES CALLED SEDIMENT TRAP OR DRIP
LEG) MUST BE INCORPORATED IN THE PIPING (SEE FIG. 5). THE
DIRT LEG MUST BE READILY ACCESSIBLE AND NOT SUBJECT
TO FREEZING CONDITIONS. INSTALL IN ACCORDANCE WITH
RECOMMENDATIONS OF SERVING GAS SUPPLIERS. REFER
TO THE CURRENT EDITION OF THE NATIONAL FUEL GAS CODE.
For Canadian installations consult Canadian Installation Code CAN/
CSA-B149.1.
To prevent damage, care must be taken not to apply too much torque
when attaching gas supply pipe to gas valve inlet.
Apply joint compounds (pipe dope) sparingly and only to the male threads
of pipe joints. Do not apply compounds to the rst two threads. Use
compounds resistant to the action of liqueed petroleum gases.
7
HEATER WIRING
All electrical work must be installed in the United States in accordance with the current edition of the National Electrical Code ANSI/NFPA No.
70, in Canada, with the current edition of Canadian Electrical Code CSA C22.1, must conform to all local code authority having jurisdiction. AN
ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRICAL SHOCK OR POSSIBLE ELECTROCUTION.
If any of the original wire as supplied with the appliance must be replaced, use only type 105°C thermoplastic or equivalent, 250°C type F must
be used for the ame sensor leads and the spark ignition cable must be high voltage 250°C.
CAUTION
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND
DANGEROUS OPERATION. VERIFY PROPER OPERATION AFTER SERVICING.
FIGURE 4. WIRING DIAGRAM AND SCHEMATIC
8
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