506528-01
Page 23 of 37
Issue 1035
Refer to Figure 23 for schematic wiring diagram and
troubleshooting and Figure 24 for field wiring.
The power supply wiring must meet Class I restrictions.
Protected by either a fuse or circuit breaker, select circuit
protection and wire size according to unit nameplate.
NOTE:
Unit nameplate states maximum current draw.
Maximum over current protection allowed is 15 AMP.
Holes are on both sides of the furnace cabinet to facilitate
wiring.
Install a separate (properly sized) disconnect switch near
the furnace so that power can be turned off for servicing.
INTERIOR MAKE-UP BOX INSTALLATION
Figure 20
INTERIOR MAKE-UP BOX INSTALLATION
Figure 21
Before connecting the thermostat, check to make sure the
wires will be long enough for servicing at a later date. Make
sure that thermostat wire is long enough to facilitate future
removal of blower for service.
Complete the wiring connections to the equipment. Use the
provided unit wiring diagram and the field wiring diagram
shown in Figure 24. Use 18 gauge wire or larger that is
suitable for Class II rating for thermostat connections.
Electrically ground the unit according to local codes or, in
the absence of local codes, according to the current National
Electric Code (ANSI/NFPA No. 70). A green ground wire is
provided in the field make-up box.
NOTE:
This furnace contains electronic components that
are polarity sensitive. Make sure that the furnace is wired
correctly and is properly grounded.
Accessory Terminals
One line voltage “EAC” 1/4" spade terminal is provided on
the furnace integrated control. See Figure 25 for integrated
control configuration. This terminal is energized when the
indoor blower is operating. Any accessory rated up to one
amp can be connected to this terminal with the neutral leg
of the circuit being connected to one of the provided neutral
terminals. If an accessory rated at greater than one amp is
connected to this terminal, it is necessary to use an external
relay.
One line voltage “HUM” 1/4" spade terminal is provided on
the furnace integrated control. See Figure 25 for integrated
control configuration. This terminal is energized in the
heating mode when the combustion air inducer is operating.
Any humidifier rated up to one amp can be connected to
this terminal with the neutral leg of the circuit being connected
to one of the provided neutral terminals. If a humidifier rated
at greater than one amp is connected to this terminal, it is
necessary to use an external relay relay.
Generator Use - Voltage Requirements
The following requirements must be kept in mind when
specifying a generator for use with this equipment:
•
The furnace requires 120 volts ± 10% (Range: 108 volts
to 132 volts).
•
The furnace operates at 60 Hz ± 5% (Range: 57 Hz to
63 Hz).
•
The furnace integrated control requires both polarity and
proper ground. Both polarity and proper grounding
should be checked before attempting to operate the
furnace on either permanent or temporary power.
•
Generator should have a wave form distortion of less
than 5% RHO.
