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438335-UIM-B-0509
10 Johnson Controls Unitary Products
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 7 in
these instructions for specific furnace electrical data.
Table 5: Nominal Manifold Pressure - High Fire
Manifold Pressures (in. w.c.) Manifold Pressures (kPa)
Altitude (feet) Altitude (m)
0-7999 8000-8999 9000-9999 0-2437 2438-2742 2743-3048
Gas Heating Value
(BTU/cu ft.)
800 3.5 3.5 3.5
Gas Heating Value
(MJ/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
TABLE 6:
Nominal Manifold Pressure - Low Fire
First Stage Manifold Pressures (in. w.c.) First Stage Manifold Pressures (kPa)
Altitude (feet) Altitude (m)
0-7999 8000-8999 9000-9999 0-2437 2438-2742 2743-3048
Gas Heating Value
(BTU/cu ft.)
800 1.7 1.7 1.7
Gas Heating Value
(MJ/cu m)
29.8 0.42 0.42 0.42
850 1.7 1.7 1.7 31.7 0.42 0.42 0.42
900 1.7 1.7 1.7 33.5 0.42 0.42 0.42
950 1.7 1.7 1.5 35.4 0.42 0.42 0.38
1000 1.6 1.5 1.4 37.3 0.41 0.37 0.34
1050 1.5 1.4 1.3 39.1 0.37 0.34 0.31
1100 1.3 1.2 1.1 41.0 0.34 0.31 0.28
2500 (LP) 4.1 3.8 3.5 93.2 (LP) 1.03 0.95 0.87
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.