W415-0919 / D / 03.27.13
37
13.0 ConveRsIons
hIgh AlTITuDE:
In Canada, this furnace does not need to be converted for high altitude (2000 - 4500
feet). It has been certified to operate at high altitude as manufactured.
In the united States, the modifications for high altitude are based on a 4% reduction of input capacity for every
1000 feet above 2000 feet above sea level. Table 6 illustrates the impact of altitude for selected elevations.
Consult with local fuel suppliers or authorities to determine local regulations or customs.
NATuRAl To lp gAS: This series furnace is manufactured as a natural gas appliance that may be converted
to lp gas through use of the
Conversion Kit part number W370-0018
. This kit contains the conversion kit
instructions, orifices needed for all models, the regulator springs for the gas valve, and a label to affix adjacent to
the appliance rating plate to alert subsequent service technicians of the conversion.
The parts removed for this
conversion must remain with the furnace for any future conversion back to natural gas.
13.1 ConveRsIon sTeps
TABLE 6 - HIGH ALTITUDE SPECIFICATIONS (U.S.A.)
MODEL
ALTITUDE
(FT)
ORIFICE SIzE (DMS)
NATURAL
LP GAS
60/80
100/120
0-2000
45
55
2000-3000
48
56
3000-4000
49
57
4000-5000
50
58
5000-6000
51
60
6000-7000
52
61
7000-8000
53
62
8000-9000
54
63
9000-10000
55
65
† Gas input ratings are certified for elevations to 2000 ft. For elevations above
2000 ft, reduce ratings 2% for each 1000 ft above sea level.
Refer to Conversion Ng to lp kit (W370-0018) for complete instruction.
TABLE 6a - HIGH ALTITUDE SPECIFICATIONS (U.S.A.)
Input
K/Btu/hr
ALTITUDE (FT)
ORIFICE SIzE (DMS)
NATURAL
LP GAS
45
0-2000
50
57
2000-3000
53
58
3000-4000
54
59
4000-5000
55
60
5000-6000
56
62
6000-7000
57
63
7000-8000
58
64
8000-9000
59
65
9000-10000
60
67
13.2 CheCKInG The InleT Gas pRessURe
WHITE-RODGERS 36G54 TWO STAGE GAS vALvE
1. Turn off the gas and electrical supply.
2. back inlet pressure test screw (inlet pressure boss, see FIguRE 31) counterclockwise out one turn maxi-
mum, with a 3/32” Allen wrench. Attach a hose and calibrated u-tube or digital manometer to the inlet
pressure boss. hose should overlap boss 3/8”. The manometer must have a scale range of at least 0” to
15” of water column.
3. Turn oN the gas and electrical supply and operate the furnace and all other gas consuming appliances on
the same gas supply line. using a soap and water solution, check for leaks around the gas valve/manifold
connection and the burner orifices. Repair any leaks before continuing.
4. measure furnace gas inlet pressure with burners firing. Inlet pressure must be within the range specified on
the furnace rating plate. 5-7” w.c. (Natural gas) or 11-13” w.c. (lp).
If the inlet pressure differs from the rating plate, make the necessary adjustments to pressure regulator,
gas piping size, etc. and/or consult with local gas utility.
5. Turn off gas and electrical supply to furnace, remove the manometer hose from the inlet pressure tap boss,
and tighten the inlet pressure tap screw using the 3/32” Allen wrench. (Clockwise, 7 in-lb minimum).
6. Turn on the gas supply and electrical power to the furnace.
7. using a leak detection solution or soap suds, check for leaks at pressure boss screw. bubbles forming
