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NOTE: To determine the size of the branch gas line from the main gas line to the fireplace, enter the tables below (for
iron pipe or copper tubing) using the distance from the gas meter or second stage regulator to the furthest appliance on
the gas system. Select a pipe or tube diameter which has enough capacity to meet the maximum input requirement of
the fireplace. Regardless, do not use less than 1/2" diameter for the branch line. For any distances required longer than
shown in these tables, refer to the National Fuel Gas Code.
NOTE: There may be a local gas utility requirement specifying a minimum diameter for gas piping. All units require a 1/2 inch pipe con-
nection at the gas valve.
Length
of
1/2" D
Pipe
Natural
20'
92
30'
73
40'
63
50'
56
60'
50
70'
46
90'
40
100'
38
Tubing Length
Feet
10
20
30
40
50
60
80
100
WARNING: Use only internally tinned copper tubing. If correct copper tubing is not used, tubing can deteriorate and
develop gas leaks.
Gas Pressure Check
The gas inlet pressure specified in Table 1 is the pressure
where the field-installed gas line connects to the gas control.
This is measured at the inlet test port on the gas valve in the
appliance. Ensure that pressure is as shown in Table 1.
The manifold pressure is controlled by a regulator built into the
gas control and should be checked at the pressure test points
located between the flame adjustment knob and the control
knob at the front of the valve. The pressure connections accept
1/4" I.D. hose or tubing.
The pressure should be checked with the appliance burning on
high (highest setting) and all other gas appliances turned on.
One must then read the manometer and if pressures are not as
specified in Table 1, then the inlet pressure must be adjusted .
After measuring the pressure, tighten the screw in the pressure
test port and check for leaks. Replace the control box cover
and the two Phillips head screws.
20008055
Gas Line Pipe Sizing
Cubic Feet per Hour based on 0.3" W.C. Pressure Drop
Specific Gravity for Natural Gas - 0.6 (1000 BTU/Cubic Foot)
Specific Gravity for Propane Gas - 1.6 (2550 BTU/Cubic Foot)
Nominal Inches for Iron Pipe Sizes (1,000s BTU/hr)
3/4" D
Propane
Natural
Propane
143
190
296
115
152
237
97
130
202
87
115
179
79
105
163
71
96
151
61
84
130
59
79
122
Outside Diameter Copper Tubing, Type L (1,000s BTU/hr)
1/2"
0.43
110
76
61
52
46
42
36
32
CAPACITY OF PIPING
1" D
Natural
Propane
350
546
285
444
245
380
215
334
196
304
180
280
160
250
150
235
5/8"
0.545
206
141
114
97
86
78
67
59
Table 1
Gas Inlet Pressure
Manifold Pressure
*Minimum inlet supply pressure for the purpose of input adjustment.
CAUTION: If the appliance's operating pressures are not
checked and adjusted, improper combustion may result in soot
being produced.
1¹⁄₄" D
Natural
Propane Natural
730
1135
590
918
500
778
440
683
400
622
370
576
320
497
305
474
3/4"
7/8"
0.666
0.785
348
536
239
368
192
296
164
256
146
224
132
203
113
174
100
154
Natural
Max.
10.5" w.c.
Normal
Min.*
3.5" w.c.
1¹⁄₂" D
Propane
1100
1711
890
1385
760
1183
670
1043
610
949
560
872
490
763
460
717
Propane
13" w.c.
7" w.c.
11" w.c.
5" w.c.
11" w.c.
10.0" w.c.
13
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