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3
Gas connections
Combination gas valve/regulators equipped with integral vent
limiters are not required to have vent or relief lines piped to
the outdoors. The termination of the vent limited opening on
the combination gas valve/regulator complies with the safety
code requirements of CSD-1, CF-190(a) as shipped from the
appliance manufacturer without the installation of additional
vent lines.
Checking gas supply pressure
Use the following procedure to check gas supply pressure.
1. Turn the main power switch to the "OFF" position.
2. Turn gas valve knobs to the "OFF" position.
3. Shut off gas supply at the field-installed manual gas cock in
the gas piping to the unit. If fuel supply is L.P. gas, shut off
gas supply at the tank.
4. Remove the 1/8" hex plug, located on the "inlet" side of the
gas valve. You may also use a tapping on the field-installed
main manual gas cock or gas piping. Install a fitting in the
inlet pressure tapping suitable to connect to a manometer
or magnehelic gauge. Range of scale should be 14" w.c. or
greater to check inlet pressure.
5. Turn on gas supply at the manual gas cock, turn on L.P. gas
at the tank if required.
6. Turn the power switch to the "ON" position.
7. Turn the gas valve knobs to the "ON" position. Set the
electronic temperature control or thermostat to call for
heat.
8. Observe the gas supply pressure as all burners are firing.
Ensure that inlet pressure is within the specified range.
See Connecting To Gas Supply, page 34 for minimum and
maximum gas supply pressures.
9. If gas pressure is out of range, contact gas utility, gas
supplier, qualified installer or service agency to determine
necessary steps to provide proper gas pressure to the
control.
10. If gas supply pressure is within normal range, turn the
power switch to the "OFF" position.
11. Turn gas valve knobs to the "OFF" position.
12. Shut off gas supply at the manual gas cock in the gas piping
to the unit. If fuel supply is L.P. gas, shut off gas supply at
the tank.
Capacity of Schedule 40 Metallic Pipe in Cubic Feet of Natural Gas Per Hour
Pipe
Size
10
20
(Inches)
1/2
131
90
3/4
273
188
1
514
353
1 1/4
1,060
726
1 1/2
1,580
1,090
2
3,050
2,090
2 1/2
4,860
3,340
3
8,580
5,900
4
17,500 12,000
36
TABLE - 3D
(based on .60 specific gravity, 0.30" w.c. pressure drop)
Length of Pipe in Straight Feet
30
40
50
60
72
62
55
N/A
151
129
114
104
284
243
215
195
583
499
442
400
873
747
662
600
1,680
1,440
1,280
1,160
2,680
2,290
2,030
1,840
4,740
4,050
3,590
3,260
9,660
8,270
7,330
6,640
Installation & Operation Manual
13. Remove the manometer and related fitting from the "inlet"
side of the gas valve, replace 1/8" hex plug in gas valve and
tighten.
14. Turn on gas supply at the manual valve, turn on L.P. gas at
the tank if required.
15. Turn the power switch to the "ON" position.
16. Turn the gas valve knob to the "ON" position.
17. Set the electronic temperature control or thermostat to call
for heat.
After completing any testing on the gas
⚠WARNING
system, leak test all gas connections. Apply
a soap/water solution to all gas connections
while main burners are operating. Bubbles
forming indicate a leak. Repair all leaks at
once. Do not operate this unit with a leak in
the gas train, valves or related piping.
Check burner performance by cycling the system while you
observe burner response. Burners should ignite promptly.
Flame pattern should be stable, see Burner Flames in the
Copper-fin
Service Manual. Turn system off and allow burners
2
to cool, then cycle burners again to ensure proper ignition and
flame characteristics.
Figure 3-3_Measuring Gas Supply Pressure at
Combination Gas Valve
70
80
90
100
N/A
N/A
N/A
N/A
95
89
83
79
179
167
157
148
368
343
322
304
552
514
482
455
1,060
989
928
877
1,690
1,580
1,480
1,400
3,000
2,790
2,610
2,470
6,110
5,680
5,330
5,040
SUPPLY
INLET
PRESSURE
TAP
GAS
VALVE
CONTROL
KNOB
125
150
175
200
N/A
N/A
N/A
N/A
70
63
58
N/A
131
119
109
102
269
244
224
209
403
366
336
313
777
704
648
602
1,240
1,120
1,030
960
2,190
1,980
1,820
1,700
4,460
4,050
3,720
3,460
INLET
OUTLET
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