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650.75-N4U
FIGURE 8 - GAS PIPING
WARNING: Compounds used on threaded joints of
gas piping must be resistant to the action of liquefied
petroleum gases. After connections are made, leak-
test all pipe connections.
WARNING: After all gas piping connections are com-
pleted, leak test all joints, fittings and furnace connec-
tions with rich soap and water solution, commercially
available bubble type leak detection fluid, or other
approved means.
WARNING: Do not use an open flame or other source
of ignition for leak testing.
CAUTION: Never apply a pipe wrench to the body of
the combination automatic gas valve. A wrench must
be placed on the projection or wrench boss of the
valve when installing piping to it.
ELECTRICAL POWER CONNECTION
Field wiring to the unit must conform to and be grounded in
accordance with the provisions of the National Electrical Code
ANSI/NFPA No. 70-latest edition, Canadian Electric Code
C22.1 Part 1 - (latest edition) and/or local codes. Electric wires
which are field installed shall conform with the temperature
limitation for 63°F/35°C rise wire when installed in accordance
with instructions. Specific electrical data is given for the furnace
on its rating plate and in Table 4 or 5 of this instruction.
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
convenience in servicing. With the disconnect switch in the OFF
position, check all wiring against the unit wiring label. Also, see
the wiring diagram in this instruction.
WARNING: Use copper conductors only.
NOTE: The furnace's control system depends on correct po-
larity of the power supply and a proper ground connection.
Refer to the the furnace control diagnostics section for
symptoms of reversed power supply polarity.
10
Connect the power supply as shown on the unit wiring label on
the inside of the blower compartment door and Figure 9 & 10.
The black furnace lead must be connected to the L1 (hot) wire
from the power supply. The white furnace lead must be con-
nected to neutral. Also, the green equipment ground wire must
be connected to the power supply ground.
FIGURE 9 - UPFLOW MODELS - ELECTRICAL WIRING
FIGURE 10 - DOWNFLOW / HORIZONTAL MODELS -
ELECTRICAL WIRING
Unitary Products Group
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