Water Heater Installation Manual
30 Page
GAS SUPPLY AND GAS PIPE SIZING
-General-
• Do not use this water heater with any gas other than the one listed on the rating plate.
• Ensure that any and all gas regulators used are operating properly and providing gas
pressures within the specified range shown below. Excess gas inlet pressure may cause
serious accidents.
• Conversion of this unit from natural gas to propane or vice versa will void all warranty.
Contact your local distributor to get the correct unit for your gas type. The manufacturer is
not liable for any property and/or personal damage resulting from gas conversions.
• Failure to observe these warnings could result in severe personal injury, carbon monoxide
poisoning, or death.
WARNING
• The minimum and maximum inlet gas pressures are:
Gas type Inlet gas pressure
Natural Gas Min. 4.0" W.C. (1.00 kPa) – Max. 10.5" W.C. (2.61 kPa)
Propane Min. 8.0" W.C. (1.99 kPa) – Max. 14.0" W.C. (3.48 kPa)
• Inlet gas pressures that fall outside the range of values listed above may adversely affect the performance of
the water heater. These pressures are measured when the water heater is in full operation and in standby.
• Inlet gas pressure must not exceed the above maximum values; gas pressure above the specified range will
cause dangerous operating conditions and damage to the unit.
• Until testing of the main gas line supply pressure is completed, ensure the gas line to the water heater is
disconnected to avoid any damage to the water heater.
• If the gas supply pressure to the heater is greater than the specified maximum, a field-supplied regulator is
required. The regulator must lower the gas pressure within the approved range.
• Install the gas regulator according to the manufacturer's instructions.
• The regulator must be sized for the water heater input and provide the specified pressures that are listed on
the rating plate.
• In the absence of minimum install distance stated by the regulator manufacturer, it is recommended that
there is at least 3 ft (1 m) of piping between the regulator outlet and the water heater's inlet gas connection.
-Gas connecons-
1. Install a manual gas shutoff valve between the water heater and the gas supply line.
2. When the gas connections are completed, it is necessary to perform a gas leak test either by applying soapy
water to all gas fittings and observing for bubbles or by using a gas leak detection device.
• The water heater and its individual shutoff valve must be disconnected from the gas supply piping
system during any pressure testing of that system at test pressures in excess of 1/2 psi (3.5 kPa).
• The water heater must be isolated from the gas supply piping system by closing its individual manual
shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or
less than 1/2 psi (3.5 kPa).
3. Always purge the gas line of any debris and/or water before connecting to the gas inlet.
Size the gas pipe appropriately to supply the necessary volume of gas required
for the water heater using ANSI Z223.1/NFPA 54. Otherwise, flow capabilities
and output temperatures will be limited.
NOTICE
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Installaon Manual