Bradford White URG2PV50T6N, Manual

Page: 32 / 48

32
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
one (1.0) inch
(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 fourteen (14.0) inches
(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 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 three (3) inches
(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
Prior to connecting the gas supply line to a gas fired water heater, ensure that
the gas supply line does not have moisture/water or dirt/scale inside the gas
line. Commonly this check is done at the lowest point in the gas distribution
system prior to gas burning appliances.
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.
CAUTION
The water heater and individual shutoff valve must be disconnected from the
gas supply piping system during any pressure testing of the 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 manual shutoff valve during any
pressure testing of the gas supply system at test pressures equal to or less than
1/2 psi
(3.5 kPa). The supply line must be capped when not connected to the
water heater.