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UV36RN/RP Vent-Free Gas Fireplaces
20007436
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
Table 1
Gas Inlet Pressure Natural Propane
Max. 14.0” w.c. 14.0” w.c.
Normal 7.0” w.c. 11.0” w.c.
Min.* 4.5” w.c. 11.0” w.c.
Regulator Pressure 3.5” w.c. 10.0” w.c.
*Minimum inlet supply pressure for the purpose of input adjustment.
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.
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.
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)
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 de
-
velop gas leaks.
CAUTION: If the appliance’s operating pressures
are not checked and adjusted, improper combus-
tion may result in soot being produced.