GAS PRESSURE CHECK
Check the inlet pressure to the appliance to ensure that it is
as shown in
Table
1.
Also check the incoming gas
pressure where the field installed gas line connects to the
gas logs.
The manifold pressure is controlled by the gas valve and
should be checked at the pressure test point located near
the outlet end of the combination control.
The pressure should be checked with the appliance burning
on high (highest setting) and all other appliances turned on.
One mus t then read the manometer and if pressures are
not 10.0” W.C. for LP or 4.5” W.C. for Natural gas the inlet
pressure must be adjusted or increased until the proper
pressures are attained. If these pressures are greater than
10.2” W.C. for LP or 4.7” W.C. for Natural gas, contact your
gas supplier before operating the appliance.
After measuring the pressure, replace the test point plug
and check for leaks.
CAUTION: If the appliance's operating pressures are
not checked and adjusted, improper combustion may
result in soot being produced. Record the results of
the gas pressure check on the appropriate documents.
TESTING THE GAS PIPING.
Test all piping for leaks.
When checking gas piping to the heater with gas pressure
less than 1/2 PSI, shut off manual gas valve for the heater.
If gas piping is to be checked with th e pressure at or above
1/2 PSI, the heater and manual shut off valve must be
disconnected during testing to prevent damage to the
regulator on the unit. (SEE WARNING).
To ensure that the gas lines and connections do not have
any leaks, a pressure test should be performed.
Only a
qualified installer should perform the pressure test to
ensure that the unit is not damaged by high pressures!
Table 1
Gas Inlet Pressure
Natural
Propane
Max.
10.5 ins. WC
13 ins. WC
Normal
7.0 ins. WC
11 ins. WC
Min.*
5.5 ins. WC
10.8 ins. WC
Regulator Pressure
4.5 ins. WC
10 ins. WC
*Minimum inlet supply pressure for the purpose of input adjustment
Outside Diameter Copper Tubing, Type L (1,000s BTU/Hr)
Tubing
Length
Feet
1/2"
0.43
5/8"
0.545
3/4"
0.666
7/8"
0.785
10
110
206
348
536
20
76
141
239
368
30
61
114
192
296
40
52
97
164
256
50
46
86
146
224
60
42
78
132
203
80
36
67
113
174
100
32
59
100
154
WARNING: Use only internally tinned copper tubing. If correct copper tubing is not used, tubing can deteriorate
and develop gas leaks.
Pipe
Natural
Propane
Natural
Propane
Natural
Propane
Natural
Propane
Natural
Propane
20'
92
143
190
296
350
546
730
1135
1100
1711
30'
73
115
152
237
285
444
590
918
890
1385
40'
63
97
130
202
245
380
500
778
760
1183
50'
56
87
115
179
215
334
440
683
670
1043
60'
50
79
105
163
196
304
400
622
610
949
70'
46
71
96
151
180
280
370
576
560
872
90'
40
61
84
130
160
250
320
497
490
763
100'
38
59
79
122
150
235
305
474
460
717
of
1/2" D
3/4" D
1" D
1¼" D
1½" D
Length
NOMINAL INCHES FOR IRON PIPE SIZES (1,000s BTU/Hr)
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 connection at the
gas valve.
CAPACITY OF PIPING
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)
GAS LINE PIPE SIZING
9
WARNING: Be sure that the gas type indicated on
the gas log rating plate concurs with the gas
system in your building.