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9
MANOMETER
GAS PRESSURE
TEST AT GAS
VALVE
GAS PRESSURE TEST
A
T HEATER
MANUAL
SHUTOFF
VALVE
GAS PRESSURE
TEST UPSTREAM
Model
No.
1” 1-1/4” 1-1/2” 2” 2-1/2” 3” 4”
N P N P N P N P N P N P N P
926/962 15 20 45 45 110 150 360 400
1083/1125 10 15 35 35 80 120 300 300
1178/1223 25 25 60 85 220 200
1287/1336 25 20 55 75 180 170 325 560
1414/1468 20 15 45 65 150 165 300 500
1571/1631 15 15 35 50 20 125 250 400
1758/1826 15 10 30 40 100 100 225 340
2100 10 10 25 30 80 75 175 260
2500 15 20 55 55 135 160 400 600
3001 10 15 35 40 85 120 250 500
3500 10 30 30 45 80 200 400 600
4001 5 20 25 35 65 160 300 400
Natural Gas, 1000 BTU/FT
3
.60 Specific Gravity @ 0.5 in. WC Pressure Drop
Propane Gas, 2500 BTU/FT
3
1.53 Specific Gravity @ 0.6 in. WC Pressure Drop
Table B: Maximum Equivalent Pipe Length
Fig. 6: Gas Pressure Test Points
Venting of Diaphragm Gas
Components
Heaters with gas train components that have
diaphragms in their construction are supplied with a
bleed line connection that must be connected to the
outside atmosphere as required by the National Fuel
Bleed Line
Connection
Fig. 7: Bleed Line Connection
Gas Code. Under NO circumstances shall bleed lines
terminate in the gas utilization equipment flue or
exhaust system.