CFM UVHK29MN Manuale Utente
12
20008056
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.
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.
nection at the gas valve.
Gas Line Pipe Sizing
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 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 regulator and should
be checked at the pressure test point located downstream from
the regulator on the control valve body. Access to the pressure
test point is obtained by removing all logs and the heat shield
on the right hand rear side of the base. The pressure test point
1/8” NPT plugged tapping is located on the rear face of the
control body. (Fig. 5)
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
10” w.c. for LP or 3.5” w.c. for natural gas, then the inlet pres-
sure must be adjusted or increased until the proper pressures
are attained. If these pressures are greater than 10” w.c. for
LP or 3.5” w.c. for natural gas, contact your gas supplier before
operating the appliance.
The pressure regulator is preset and locked to prevent tamper-
ing. If the pressure is not as specified, replace the regulator
with part # 73332 (for natural gas only), or part # 73333 (for L.P.
gas only).
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 regulator and should
be checked at the pressure test point located downstream from
the regulator on the control valve body. Access to the pressure
test point is obtained by removing all logs and the heat shield
on the right hand rear side of the base. The pressure test point
1/8” NPT plugged tapping is located on the rear face of the
control body. (Fig. 5)
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
10” w.c. for LP or 3.5” w.c. for natural gas, then the inlet pres-
sure must be adjusted or increased until the proper pressures
are attained. If these pressures are greater than 10” w.c. for
LP or 3.5” w.c. for natural gas, contact your gas supplier before
operating the appliance.
The pressure regulator is preset and locked to prevent tamper-
ing. If the pressure is not as specified, replace the regulator
with part # 73332 (for natural gas only), or part # 73333 (for L.P.
gas only).
CAUTION: If the appliance’s operating pressures are not
checked and adjusted, improper combustion may result in soot
being produced.
checked and adjusted, improper combustion may result in soot
being produced.
After measuring the pressure, replace the test point plug and
check for leaks. Replace the control box cover and the two
phillips head screws.
check for leaks. Replace the control box cover and the two
phillips head screws.
Length
Nominal Inches for Iron Pipe Sizes (1,000s BTU/hr)
of
1/2” D
3/4” D
1” D
1¹⁄₄” D
1¹⁄₂” D
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
Outside Diameter Copper Tubing, Type L (1,000s BTU/hr)
Tubing Length
1/2”
5/8”
3/4”
7/8”
Feet
0.43
0.545
0.666
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.
gas leaks.
T126
Test point
10/29/03 djt
Table 1
Gas Inlet Pressure
Natural
Propane
Max.
10.5” w.c.
13” w.c.
Normal
7” w.c.
11” w.c.
Min.*
5.5” w.c.
11” w.c.
Regulator Pressure
3.5” w.c.
10.0” w.c.
*Minimum inlet supply pressure for the purpose of input adjustment.
Test Point
T126
Fig. 5 Pressure test point.