Bradford White M-2-TW-75T6SX - Manual (Page 30)

30
Gas Connections
The gas supply lines must meet all requirements of the National Fuel Gas Code
ANSI Z223.1-(Latest Edition) and/or in Canada CAN/CGA B149 Installation
Codes - (Latest Editions).
The minimum permissible gas supply pressure for the purpose of input
adjustment is 5.5” water column (1.37 kPa) for natural gas and 11.0” water
column (2.74 kPa) for L.P. gas. See the rating plate and combination gas
control for the manifold pressure and gas type. The maximum permissible gas
supply pressure is 14.0” water column (3.5 kPa) 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 1/2 inch black iron pipe. (Dirt and
scale from the pipe can enter the combination control and cause it to
malfunction). The inlet gas line must have a minimum length of 3” (7.6 cm)
drip leg (sediment trap) installed as close to the water heater’s combination
gas control as possible. A ground joint union must be installed 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.
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!
3. While checking for leaks care must be taken to prevent solution from
contacting the electrical connections at the control. If electrical
connections at the control become wet, they must be thoroughly dried before
attempting to operate the water heater.
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.