Majestic fireplaces UVHK36MN Manual de instrucciones de instalación y funcionamiento - Página 12

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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

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).
12

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
Regulator Pressure
*Minimum inlet supply pressure for the purpose of input adjustment.
After measuring the pressure, replace the test point plug and
check for leaks. Replace the control box cover and the two
phillips head screws.
CAUTION: If the appliance's operating pressures are not
checked and adjusted, improper combustion may result in soot
being produced.
Fig. 5 Pressure test point.
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
7" w.c.
Min.*
5.5" w.c.
3.5" w.c.
Test Point
T126
1¹⁄₂" D
Propane
1100
1711
890
1385
760
1183
670
1043
610
949
560
872
490
763
460
717
Propane
13" w.c.
11" w.c.
11" w.c.
10.0" w.c.
T126
20008056