507404-02Page 42 of 80 Issue 1448
Electrical
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
The unit is equipped with a eld makeup box. The makeup
box may be moved to the right side of the furnace to facilitate
installation. Seal unused openings on left side with plugs
removed from right side. Secure the excess wire to the
existing harness to protect it from damage.
Refer to Figure 64 for eld wiring and Figure 65 for schematic
wiring diagram and troubleshooting.
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.
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 eld wiring
diagram shown in Figure 64. 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 eld 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.
Table 10
Electrostatic discharge can affect electronic components.
Take precautions during furnace installation and service
to protect the furnace’s electronic controls. Precautions
will help to avoid control exposure to electrostatic
discharge by putting the furnace, the control and the
technician at the same electrostatic potential. Neutralize
electrostatic charge by touching hand and all tools on
an unpainted unit surface, such as the gas valve or
blower deck, before performing any service procedure.
CAUTION
Figure 60
INTERIOR MAKE-UP BOX INSTALLATION
Figure 61
INTERIOR MAKE-UP BOX INSTALLATION
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