Gas Pressure
WARNING
Exposure to a higher gas supply pressure
may cause damage to the control, resulting
in explosion or fire. Consult your local gas
supplier and gas authorities. DO NOT PUT
INTO SERVICE IF OVER-PRESSURIZATION
HAS OCCURRED.
The manufacturer recommends that the gas supply pres-
sure, as measured on the inlet side of the water heater con-
trol, be set at 7.0 in. w.c.(1.7 kPa) for natural gas and 11.0
in. w.c. (2.7 kPa) for propane gas. The above pressures
must be measured during water heater operation.
The gas control supplied with this water heater is designed
for a maximum inlet pressure of 0.5 psi (14 in. w.c.). Do
not exceed this limit. The Flame GuardTM safety system is
designed to operate within the pressure ranges shown in
Table 1. Rated manifold pressures are indicated on the rat-
ing plate of the water heater.
Rated Manifold
Pressure.
in. w.c. (kPa)
Min. Manifold
Pressure.
in. w.c. (kPa)
Max. Manifold
Pressure.
in. w.c. (kPa)
10 (2.48) 9.2 (2.28) 10.2 (2.53)
5 (1.24) 4.5 (1.11) 5.1 (1.26)
4 (0.99) 3.6 (0.89) 4.4 (1.09)
Table 1 Manifold Pressure
Gas line purging
Gas line purging is required to eliminate air from the piping
system. Purging should be performed by persons expe-
rienced in this type of gas service in compliance with the
code having jurisdiction. Do not purge in confined areas
or space where ignition may occur. To avoid risk of fire or
explosion ensure the area is well ventilated and all sources
of ignition are de-activated. Contact your local gas authority
for local requirements.
Gas Leak Testing
Important: This water heater and its gas connection must
be tested for leaks before placing the appliance in opera-
tion. Perform a leak test at normal gas pressure. If the
applicable code(s) require the gas lines to be tested at a
pressure of 14 in. w.c. (3.5 kPa) or greater, the water heater
and its manual shut-off valve must be disconnected from
the gas supply piping system and the line capped. Test all
connections of the gas system with a chloride-free soap
and water solution or equivalent leak test liquid. Bubbles
will indicate leaks. Never use a match or open flame to test
for gas leaks. A fire or explosion could result. If leaks exist
repair as required and retest.
DO NOT light the burner before the tank is filled with water
and you have confirmed that there are no leaks in the piping
and connections.
Air Requirements
Important: Air for combustion and ventilation must not
come from a corrosive atmosphere. Any failure due to corro-
sive elements in the atmosphere is excluded from warranty
coverage.
Installations in or for certain places including, but not limited
to, those listed below may require outdoor air for combus-
tion to reduce the risk of chemical exposure:
• Beauty shops, Photo processing labs
• Buildings with indoor pools
• Water heaters installed in laundry, hobby or craft
rooms
• Water heaters installed near chemical storage areas
In such circumstances, outdoor combustion air may reduce,
but will not eliminate the presence of corrosive chemicals in
the air. Combustion air must be free of acid-forming chemi-
cals such as sulfur, fluorine and chlorine. These elements
are found in aerosol sprays, detergents, bleaches, clean-
ing solvents, air fresheners, paint and varnish removers,
refrigerants and many other commercial and household
products. When burned, vapours from these products form
highly corrosive acid compounds. These products should
not be stored or used near the water heater or air inlet.
Adequate combustion and ventilation air must be provided
for operation of this water heater and all appliances located
within the enclosure/structure. Follow the requirements
of "Natural Gas and Propane Installation Code" CSA
B149.1 in Canada and "National Fuel Gas Code" ANSI
Z223.1 (NFPA 54) in the USA. If you are unsure call your
gas supplier. Failure to provide the proper amount of com-
bustion and ventilation air can result in a fire or explosion
and cause death, serious bodily injury or property damage.
Ensure sufficient ventilation air to prevent elevated tem-
peratures.
When an exhaust fan is installed in the same room as the
water heater, the supply air openings must be of sufficient
capacity to prevent a backflow of air through the water
heater exhaust venting.
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