Installation / Operation Instruction Manual
23
Figure 14 – Typical Plumbing Schematic for Zoned Heating
SECTION VII: 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 B 149.2 Propane Installation Code
(Latest Edition).
The maximum permissible gas supply pressure is 14 in
(3.5 kPa) W.C. for natural and propane gas.
1. Connect this water heater only to the type of gas 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).
NOTICE
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.
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.
WARNING
NEVER USE A MATCH OR OPEN FLAME FOR TESTING.