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Refer to Figure 45 for schematic wiring diagram and
troubleshooting and Figure 44 for field wiring.
1.
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 shown in
Table 10.
2.
Holes are on both sides of the furnace cabinet to
facilitate wiring.
3.
Install a separate (properly sized) disconnect switch
near the furnace so that power can be turned off for
servicing.
Capacity
070
090, 110
Table 10.
4.
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.
5.
Complete the wiring connections to the equipment.
Use the provided unit wiring diagram and the field
wiring diagram shown in Figure 44. Use 18 gauge
wire or larger that is suitable for Class II rating for
thermostat connections.
6.
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.
7.
One line voltage "ACC" 1/4" spade terminal is provided
on the furnace integrated control. Any electronic air
cleaner or other 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. See Figure 44 for control configuration.
This terminal is energized when the indoor blower is
operating.
8.
One line voltage "HUM" 1/4" spade terminal is provided
on the furnace integrated control. 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. See Figure 44 for
control configuration. This terminal is energized in the
heating mode whenever the combustion air inducer is
operating.
507335-03
Maximum Over-Current
Protection (Amps)
15
20
Issue 2302
9.
Install the room thermostat according to the instructions
provided with the thermostat. If the furnace is being
matched with a heat pump, refer to the instruction
packaged with the dual fuel thermostat.
Indoor Blower Speeds
1. When the thermostat is set to "FAN ON," the indoor
blower will run continuously at approximately 50%
of the second stage cooling speed when there is no
cooling or heating demand. See Table 12 for allowable
continuous circulation speeds.
2.
When this unit is running in the heating mode, the
indoor blower will run on the heating speed designated
by the positions of DIP switches 1 (A,B,C,D) of the
HEAT jumper plug. When the heat demand is satisfied,
the indoor blower will continue to run at the low stage
heat cfm for the duration of the user-selected heat
blower off delay. The user can select one of the four
preset heat blower off delays (60/90/120/180 sec) by
repositioning the movable shunt on the 5-pin header
on the ignition control.
60
90
120
180
Figure 31. Heat Blower Off Delay Moveable Shunt
3.
When there is a cooling demand, the indoor blower will
run on the cooling speed designated by the positions
of DIP switches (A, B, C, D) of the COOL jumper plug.
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% RHD.
Heat Blower OFF
Delay Moveable
Shunt
Page 25 of 39
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