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13.0
CONVERSIONS
13.1 HIGH ALTITUDE CONVERSION
In Canada, the modifi cations for high altitude are based on a 10% reduction of input capacity for elevations
from 2000 - 4500 feet (610m - 1372m).
In the United States, the modifi cations for high altitude are based on a 4% reduction of input capacity for every
1000 feet (305m) above 2000 feet (610m) 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.
TABLE 6 - HIGH ALTITUDE SPECIFICATIONS (U.S.A.)
Input
ALTITUDE
K/Btu/hr
0-2000' (0-610m)
2000-3000' (610-914m)
3000-4000' (914-1219m)
4000-5000' (1219-1524m)
40/60/80
5000-6000' (1524-1829m)
100/120
6000-7000' (1829-2134m)
7000-8000' (2134-2438m)
8000-9000' (2438-2743m)
9000-10000' (2743-3048m)
Gas input ratings are certifi ed for elevations to 2000 ft. For elevations above 2000 ft, reduce ratings 2% for each 1000 ft above sea level.
13.2 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, orifi ces needed
for all models, the regulator spring for the gas valve, and a label to affi x 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.
13.3 CONVERSION STEPS
Refer to Conversion NG to LP Kit (W370-0018) for complete instruction.
13.4 CHECKING THE INLET GAS PRESSURE
WHITE-RODGERS 36J24-214 SINGLE STAGE GAS VALVE
1. Turn off the gas and electrical supply to the furnace.
2. Back inlet pressure test screw (inlet pressure boss, see FIGURE 28 & 29) counterclockwise out one turn
maximum, 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 leak detection solution, check for leaks around the gas valve/manifold
connection and the burner orifi ces. Repair any leaks before continuing.
4. Measure furnace gas inlet pressure with burners fi ring. Inlet pressure must be within the range specifi ed 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.
ORIFICE SIZE (DMS)
Input
K/Btu/hr
NATURAL
LP GAS
45
55
48
56
49
57
50
58
51
60
30
52
61
53
62
54
63
55
65
H18.1
ORIFICE SIZE (DMS)
ALTITUDE
NATURAL
0-2000' (0-610 m)
50
2000-3000' (610-914 m)
53
3000-4000' (914-1219 m)
54
4000-5000' (1219-1524 m)
55
5000-6000' (1524-1829 m)
56
6000-7000' (1829-2134 m)
57
7000-8000' (2134-2438 m)
58
8000-9000' (2438-2743 m)
59
9000-10000' (2743-3048 m)
60
H12.8.4
H18.2A
H18.3
W415-1239 / A / 03.21.14
39
IOM
LP GAS
57
58
59
60
62
63
64
65
67
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