Gas Pressure Testing

Gas Pressure

Explosion Hazard

•Gas leaks can not always be detected by smell.

•Gas suppliers recommend that you use a gas detector approved by UL or CSA.

•For more information, contact your gas supplier.

•If a gas leak is detected, follow the "What to do if you smell gas" instructions on the cover of this manual.

IMPORTANT: This water heater and its gas connection must be leak tested before placing the appliance in operation.

•If the code requires the gas lines to be tested at a pressure exceeding 14" W.C., the water heater and its manual shut-off valve must be disconnected from the gas supply piping system and the line capped.

•If the gas lines are to be tested at a pressure tess than 14" W.C., the water heater must be isolated from the gas supply piping system by closing its manual shut-off valve.

NOTE: Air may be present in the gas lines and could prevent the pilot from lighting on initial start-up. The gas lines should be purged of air by a qualified technician after installationof the gas piping system. While purging the gas piping system of air, ensure that the fuel is not spilled in the area of the water heater installation, or any source of ignition. If the fuel is spilled while purging the

piping system of air follow the "WHAT TO DO IF YOU SMELL GAS" instructions on the cover of this manual.

IMPORTANT: The gas supply pressure must not exceed the maximum supply pressure as stated on the water heater'srating plate. The minimum supply pressure is for the purpose of input adjustment.

Table 1

Natural Gas Pipe Capacity Table (Cu. Ft./Hr.)

Capacityof gas pipe of different diametersand lengths in cu. ft. per hr. with pressuredrop of 0.3 in. and specific gravity of 0.60 (naturalgas).

Nominal Iron Pipe						Length of Pipe,Feet
Size,in.	10	20	30	40	50	60	70	80	90	100	125	150	175	200
1/2	132	92	73	63	56	50	46	43	40	38	34	31	28	26
3/4	278	190	152	130	115	105	96	90	84	79	72	64	59	55
1	520	350	285	245	215	195	180	170	160	150	130	120	110	100
1-1/4	1050	730	590	500	440	400	370	350	320	305	275	250	225	210
1-1/2 1600 1100			890	760	670	610	560	530	490	460	410	380	350	320

After the length of pipe has been determined, select the pipe size which will provide the minimum cubic feet per hour required for the gas input rating of the water heater. By formula:

Cu. Ft. Per Hr. Required=

Gas Input of Water Heater (BTU/HR) Heating Value of Gas (BTU/FT 3)

The gas input of the water heater is marked on the water heater data plate. The heating value of the gas (BTU/FT 3) may be determined by consulting the local natural gas utility.

153.331492, 153.331592 specifications

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