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MANUAL
SHUTOFF
VALVE
GAS PRESSURE
TEST UPSTREAM
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
Model
No.
926/962
1083/1125
1178/1223
1287/1336
1414/1468
1571/1631
1758/1826
2100
2500
3001
3500
4001
Natural Gas, 1000 BTU/FT
Propane Gas, 2500 BTU/FT
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MANOMETER
GAS PRESSURE
TEST AT GAS
VALVE
GAS PRESSURE TEST
AT HEATER
Fig. 6: Gas Pressure Test Points
1"
1-1/4"
N
P
N
15
20
45
10
15
35
25
25
20
15
15
10
.60 Specific Gravity @ 0.5 in. WC Pressure Drop
3
1.53 Specific Gravity @ 0.6 in. WC Pressure Drop
3
Table B: Maximum Equivalent Pipe Length
Gas Code. Under NO circumstances shall bleed lines
terminate in the gas utilization equipment flue or
exhaust system.
Bleed Line
Connection
1-1/2"
2"
P
N
P
N
45
110
150
35
80
120
25
60
85
20
55
75
15
45
65
15
35
50
10
30
40
10
25
30
15
20
10
15
10
5
9
Fig. 7: Bleed Line Connection
2-1/2"
3"
P
N
P
N
360
400
300
300
220
200
180
170
325
560
150
165
300
500
20
125
250
400
100
100
225
340
80
75
175
260
55
55
135
160
35
40
85
120
30
30
45
80
20
25
35
65
4"
P
N
P
400
600
250
500
200
400
600
160
300
400
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