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Conversion
Conversion of this furnaceto useLP/propane
gasmustbemadebyqualified serviceperson-
nel,usingonly approved parts.
High Altitude Application
High altitude application
with this furnace can
be field performed
by a simple adjustment
of
manifold pressure,
and if necessary
changing
the orifices. The changes
required depend on
the installation
altitude and the heating value
of the gas. The gas heating value based on sea
level can be obtained from your
local gas util-
ity. The heating value of gas at high altitude is
always lower than the sea level heating value.
The heating values used in Tables 8 & 9 are
based on sea level values.
Natural Gas High Altitude
Conversion
All factory shipped furnaces are ready to operate
between zero and 4999 ft. above sea level. For
higher altitudes
(between 5000 and 10,000 ft.
above sea level), conversion
can be achieved
simply by adjusting the furnace manifold pres-
sure as shown in Table 8.
LP/Propane Gas Sea Level and
High Altitude Conversion
iMPORTANT
NOTE: When converting a low
NOx furnace
from
Natural
gas to LP/pro-
pane gas, it is necessary to remove the NOx
Baffles
from the furnace.
Conversion of this furnace to utilize LP/propane
gas must be made by qualified service person-
nel, using factory authorized or approved parts.
Conversion
to LP/propane
gas can be accom-
plished by first replacing the natural gas orifices
with the appropriate
LP/propane
orifices shown
in Table 10 or 11. Note: for installations between
zero and 5000 ft. above sea level, a #54 or #55
drill size orifice should be used depending upon
the rated firing rate of the unit (see Table 10 or
11).
However for installations
above 5000 ft.
above sea level, a # 55 or #56 drill size orifice
should be used. After changing the orifices, use
Table 9 to determine
the appropriate
manifold
pressure for your installation.
Conversion to LP/propane,
sea level, and high
altitude is detailed in the installation instructions
provided with the conversion kit. Approved con-
version kits are listed below.
United States LP/Propane
Gas Sea Level and
High Altitude Conversion Kit - P/N 904090A
This kit is for LP/propane
conversion
in the
United States at altitudes
between
zero and
10,000 ft. above sea level. Follow the installa-
tion instructions
supplied with the kit for proper
installation.
Furnace
input
40,000
60,000
80,000
100,000
120,000
Cabinet
Width
14.25
14.25
19.75
19.75
22.50
Nominal
Electrical
Maximum
Operating
Voltaqe
Minimum
Operating
VoltacLe.
115-60-1
115-60-1
115-60-1
115-60-1
127
127
127
127
103
103
103
103
Maximum
on
Furnace
Amperes
7.8
7.8
9.7
9.7
12.9
Minimum
Wire
Gauqe
14
14
14
14
12
115-60-1
127
103
Time=delay fuses or HACR=type circuit breakers are required.
Recommended
Maximum Thermostat
Thermostat
Wire
Gauge
24
22
20
18
Wire Length
2-wire
55 ft,
90 ft.
140 ft.
225 ft.
Table 12. Electrical
Data
4 or 5-wire
25 ft.
45 ft.
70 ft.
110 ft.
30
Maximum
on
Fuse or Circuit
Breaker Amps*
15
15
15
15
20
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