Gas Pressure Check; Gas Pipe Sizing Chart - Majestic fireplaces UV36RN Homeowner's Installation And Operating Instructions Manual

When installing this fireplace at an elevation above
2,000 feet, it may be necessary to decrease the input
rating by changing the existing burner orifice to a small-
er size. Input should be reduced four percent (4%) for
each 1,000 feet above sea level, unless the heating
value of the gas has been reduced, in which case this
general rule will not apply. To identify the proper orifice
size, check with the local gas utility.
Consult your local gas utility for assistance in determin-
ing the proper orifice for your location.

Gas Pressure Check

The gas inlet pressure specified in Table 1 is the pres-
sure 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 pres-
sure test points located between the flame adjustment
knob and the control knob at the front of the valve. The
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 de-
velop gas leaks.
20007436
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)
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
UV36RN/RP Vent-Free Gas Fireplaces
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 ap-
pliances 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 screws.
Table 1
Gas Inlet Pressure
Max.
Normal
Min.*
Regulator Pressure
*Minimum inlet supply pressure for the purpose of input adjustment.
CAUTION: If the appliance's operating pressures
are not checked and adjusted, improper combus-
tion may result in soot being produced.
1" D
Natural Propane Natural
350 546 730
285 444 590
245 380 500
215 334 440
196 304 400
180 280 370
160 250 320
150 235 305
5/8" 3/4"
0.545 0.666
206 348
141 239
114 192
97 164
86 146
78 132
67 113
59 100
Natural
14.0" w.c.
7.0" w.c.
4.5" w.c.
3.5" w.c.
1¹⁄₄" D 1¹⁄₂" D
Propane Natural
1135 1100
918 890
778 760
683 670
622 610
576 560
497 490
474 460
7/8"
0.785
536
368
296
256
224
203
174
154
Propane
14.0" w.c.
11.0" w.c.
11.0" w.c.
10.0" w.c.
Propane
1711
1385
1183
1043
949
872
763
717
11