IV-HEATING SYSTEM SERVICE CHECKS
A-C.S.A. Certication
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B-Gas Piping
IMPORTANT
CAUTION
Do not over torque (800 in-lbs) or under torque (350
in-lbs) when attaching the gas piping to the gas
valve.
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C-Testing Gas Piping
IMPORTANT
In case emergency shutdown is required, turn o the
main shut-o valve and disconnect the main power
to unit. These controls should be properly labeled
by the installer.
VALVE WILL NOT HOLD
NORMAL TEST PRESSURE
CAP
FURNACE
ISOLATE
GAS VALVE
N.P. T. PLUGGED TAP
FIGURE 55
WARNING
Do not use matches, candles, ame or any other
source of ignition to check for gas leaks.
D-Testing Gas Supply Pressure Gas Flow
(Approximate)
TABLE 17
GAS METER CLOCKING CHART
ML193
Unit
Seconds for One Revolution
Natural LP
1 cu ft
Dial
2 cu ft
Dial
1 cu ft
Dial
2 cu ft
Dial
33
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NOTE - To obtain accurate reading, shut o all other gas
appliances connected to meter.
Supply Pressure Measurement
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