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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.
Gas Pressure Testing
IMPORTANT: This water heater and its gas connection must be
leak tested before placing the appliance inoperation.
• 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.
• Ifthe gas lines are to be tested at apressure tess than 14"W.C.,
the water heater must be isolatedfrom 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's rating plate. The
minimum supply pressure is for the purpose of input adjustment.
Table 1
Natural Gas Pipe Capacity Table (Cu. Ft./Hr.)
Capacityof gaspipe of differentdiametersandlengthsincu.ft. perhr.withpressuredrop of 0.3 in. and specificgravity
of0.60 (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:
Gas Input of Water Heater (BTU/HR)
Cu. Ft. Per Hr. Required=
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.
15
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