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268882-UIM-A-0407

Unitary Products Group

SECTION V: ELECTRICAL POWER

* Wire size and overcurrent protection must comply with the National Electric Code - 14/2 wire required when connected to a 15 amp circuit breaker.

NOTES:

1. For altitudes above 2000 ft. (609 m) reduce capacity 4% for each 1000 ft. above sea level.
2. Wire size based on copper conductors, 140° F (60°C), 3% voltage drop.
3. Continuous return air temperature must not be below 55°F (12.8° C).
4. Annual Fuel Utilization Efficiency (AFUE) numbers are determined in accordance with DOE Test procedures.
5. Wire size and over current protection must comply with the National Electrical Code (NFPA-70-latest edition) and all local codes.

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 5 in
these instructions for specific furnace electrical data.

SUPPLY VOLTAGE CONNECTIONS

Provide a power supply separate from all other circuits. Install
overcurrent protection and disconnect switch per local/national
electrical codes. The switch should be close to the unit for conve-
nience in servicing. With the disconnect or fused switch in the OFF
position, check all wiring against the unit wiring label. Refer to the
wiring diagram in this instruction. See Figure 28.

Remove the screws retaining the wiring box cover. Route the
power wiring through the opening in the unit into the junction box
with a conduit connector or other proper connection. In the junc-
tion box there will be three wires, a Black Wire, a White Wire and a
Green Wire. Connect the power supply as shown on the unit-wir-
ing label on the inside of the blower compartment door or the wir-
ing schematic in Figure 11. The black furnace lead must be
connected to the L1 (hot) wire from the power supply. The white
furnace lead must be connected to neutral. Connect the green fur-
nace lead (equipment ground) to the power supply ground. An
alternate wiring method is to use a field provided 2” (5.08 cm) x 4”
(10.2 cm) box and cover on the outside of the furnace. Route the
furnace leads into the box using a protective bushing where the
wires pass through the furnace panel. After making the wiring con-
nections replace the wiring box cover and screws. Refer to Figure
10.

The furnace's control system requires correct polarity of the power
supply and a proper ground connection. Refer to Figure 11.

IMPORTANT:

The power connection leads and wiring box may be relo-

cated to the left side of the furnace. Remove the screws and cut wire tie
holding excess wiring. Reposition on the left side of the furnace and fas-
ten using holes provided.

LOW VOLTAGE CONTROL WIRING CONNECTIONS

Install the field-supplied thermostat by following the instructions that
come with the thermostat. With the thermostat set in the OFF position
and the main electrical source disconnected, connect the thermostat
wiring from the wiring connections on the thermostat to the terminal
board on the ignition module, as shown in Figure 12. Electronic thermo-
stats may require the common wire to be connected as shown with the
dashed line in Figure 12. Apply strain relief to thermostat wires passing
through cabinet. If air conditioning equipment is installed, use thermo-
stat wiring to connect on the furnace control board to the compressor
contactor on the condensing unit (unit outside). Refer to Figure 12.

IMPORTANT:

Set the heat anticipator in the room thermostat to 0.40

amps. Setting it lower will cause short cycles. Setting it higher will cause
the room temperature to exceed the set points.

TABLE 3:

Electrical and Performance Data

Input/Cabinet

Output

Nominal Airflow

Cabinet Width

Total Unit

AFUE

Air Temp. Rise