IV-HEATING SYSTEM SERVICE CHECKS
A-C.S.A. Certication
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B-Gas Piping
IMPORTANT
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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.
MANUAL MAIN SHUT-OFF
VALVE WILL NOT HOLD
NORMAL TEST PRESSURE
CAP
FURNACE
ISOLATE
GAS VALVE
1/8” N.P. T. PLUGGED TAP
FIGURE 56
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
66
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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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Manifold Pressure Measurement
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1 -
6 -
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