Installation / Operation Instruction Manual

23
Gas Connections
The gas supply lines must meet all requirements of the National Fuel Gas Code
(ANSI Z223.1-Latest Edition), or in Canada CAN/CGA B149.1 Natural Gas
Installation Code (Latest Edition) or CAN/CGA B149.2 Propane Installation
Code (Latest Edition).
The minimum permissible gas supply pressure for the purpose of input
adjustment is 1 in. (0.25 kPa) water column above the operating manifold
pressure. See the rating plate and gas valve for the manifold pressure and gas
type. The maximum permissible gas supply pressure is 14 in. (3.5 kPa) water
column for natural gas and liquefied petroleum gases/propane gas.
1. Connect this water heater only to the type of gas (Natural or Propane) as
shown on the rating plate. Use clean black iron pipe or equivalent material
approved by local codes and ordinances (dirt and scale from the pipe can
enter the gas valve and cause it to malfunction). The inlet gas line must
have a minimum length of 3 in. (7.6 cm) drip leg (sediment trap) installed
as close to the water heater’s gas valve as possible. A ground joint union
must be installed as close to the water heater as possible in the gas supply
line feeding the water heater to permit servicing of the water heater.
Compounds used on the threaded joints of the gas piping must be resistant
to the action of liquefied petroleum gases/propane gas. DO NOT apply
pipe dope to the gas valve inlet and make certain that no pipe dope has
become lodged in the inlet screen of the gas valve. Extreme care must be
taken to ensure no pipe dope enters the gas valve. Avoid excessive torque
when tightening the gas supply line to the gas valve. Excessive torque may
result in cracking of the gas valve housing and could create a gas leak.
The suggested maximum torque is 31.5 ft. lbs. (4.4 kg-m).
2. This water heater and its gas connection must be leak tested before placing
the water heater in operation. Check for gas leaks with a soap and water
solution and a brush or a commercial leak detector fluid. NEVER USE A
MATCH OR OPEN FLAME FOR TESTING!
WARNING
The manufacturer of this water heater will not be liable for any damage
or injury caused as a result of a cracked gas inlet as a result of
excessive torque.