437642-UIM-C-0210
Johnson Controls Unitary Products
11
GAS ORIFICE CONVERSION FOR PROPANE (LP)
This furnace is constructed at the factory for natural gas-fired operation,
but may be converted to operate on propane (LP) gas by using a fac-
tory-supplied LP conversion kit. Follow the instructions supplied with
the LP kit.
HIGH ALTITUDE GAS ORIFICE CONVERSION
This furnace is constructed at the factory for natural gas-fired operation
at 0 – 5,000 feet (0 – 1,524 m) above sea level.
The manifold pressure must be changed in order to maintain proper
and safe operation when the furnace is installed in a location where the
altitude is greater than 5,000 feet (1,524 m) above sea level. Refer to
Table 5 for proper manifold pressure settings.
HIGH ALTITUDE PRESSURE SWITCH CONVERSION
For installation where the altitude is less than 5,000 feet (1,524 m), it is
not required that the pressure switch be changed unless you are in an
area subject to low pressure inversions.
SECTION V: ELECTRICAL POWER
ELECTRICAL POWER CONNECTIONS
Field wiring to the unit must be grounded. Electric wires that are field
installed shall conform to the temperature limitation for 63°F (35°C) rise
wire when installed in accordance with instructions. Refer to Table 6 in
these instructions for specific furnace electrical data.
The residential supply must have a bonded neutral.
Annual Fuel Utilization Efficiency (AFUE) numbers are determined in accordance with DOE Test procedures.
Wire size and over current protection must comply with the National Electrical Code (NFPA-70-latest edition) and all local codes.
The furnace shall be installed so that the electrical components are protected from water.
LoNOx furnaces requiring propane (LP) gas must have the LoNOx
screens removed prior to installation and operation. See propane
instructions.
Table 5:
Nominal Manifold Pressure
Manifold Pressures (in w.c.)
Manifold Pressures (kpa)
Altitude (feet)
Altitude (m)
0-7999
8000-8999
9000-9999
0-2437
2438-2742
2743-3048
Ga
s He
at
ing V
a
lu
e
(B
T
U
/c
u f
t.)
800
3.5
3.5
3.5
Ga
s He
at
ing V
a
lu
e
(M
J/
cu
m)
29.8
0.87
0.87
0.87
850
3.5
3.5
3.5
31.7
0.87
0.87
0.87
900
3.5
3.5
3.5
33.5
0.87
0.87
0.87
950
3.5
3.5
3.3
35.4
0.87
0.87
0.81
1000
3.5
3.2
2.9
37.3
0.87
0.80
0.73
1050
3.5
2.9
2.7
39.1
0.87
0.73
0.67
1100
3.2
2.7
2.4
41.0
0.80
0.66
0.61
2500 (LP)
9.8
8.2
7.5
93.2 (LP)
2.44
2.03
1.86
PROPANE AND HIGH ALTITUDE CONVERSION KITS
It is very important to choose the correct kit and/or gas orifices for the altitude and the type of gas for which the furnace is being installed.
Only use natural gas in furnaces designed for natural gas. Only use propane (LP) gas for furnaces that have been properly converted to use pro-
pane (LP) gas. Do not use this furnace with butane gas.
Incorrect gas orifices or a furnace that has been improperly converted will create an extremely dangerous condition resulting in premature heat
exchanger failure, excessive sooting, high levels of carbon monoxide, personal injury, property damage, a fire hazard and/or death.
High altitude and propane (LP) conversions are required in order for the appliance to satisfactory meet the application.
An authorized distributor or dealer must make all gas conversions.
In Canada, a certified conversion station or other qualified agency, using factory specified and/or approved parts, must perform the conversion.
The installer must take every precaution to insure that the furnace has been converted to the proper gas orifice size when the furnace is installed.
Do not attempt to drill out any orifices to obtain the proper orifice size. Drilling out a gas orifice will cause misalignment of the burner flames,
causing premature heat exchanger burnout, high levels of carbon monoxide, excessive sooting, a fire hazard, personal injury, property damage
and/or death.
Use copper conductors only.
Table 6:
Ratings & Physical / Electrical Data
Input
Output
Nominal
Airflow
AFUE
Air Temp.
Rise
Max. Outlet
Air Temp
Blower
Blower
Size
Max
Over-Current
Protect
Total Unit
Amps
Min. wire Size
(awg) @ 75 ft
one way
MBH
kW
MBH
kW
CFM
m
3
/min
°F
°C
°F
°C
HP
Amps
60
17.6
48
14.1
1200
34.0
80.0
30-60
17-33
170
76.7
1/2
6.8
11 x 8
15
9.3
14
80
23.5
64
18.8
1200
34.0
80.0
35-65
19-36
165
73.9
1/2
6.8
11 x 8
15
9.3
14
80
23.5
64
18.8
1600
45.3
80.0
25-55
14-31
155
68.3
1/2
6.8
11 x 10
15
9.3
14
100
29.3
80
23.4
1600
45.3
80.0
35-65
19-36
165
73.9
1/2
6.8
11 x 10
15
9.3
14
100
29.3
80
23.4
2000
56.6
80.0
25-55
14-31
155
68.3
3/4
8.4
11 x 11
15
10.9
14
120
33.7
96
26.9
2000
56.6
80.0
35-65
19-36
165
73.9
3/4
8.4
11 x 11
15
10.9
14
