Allied A97USMV, Installation Instructions Manual

Page: 32 / 78

506887-01 Page 32 of 78 Issue 1213
Electrical
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
Figure 38
INTERIOR MAKE-UP BOX INSTALLATION
Figure 39
INTERIOR MAKE-UP BOX INSTALLATION
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
The unit is equipped with a field makeup box. The makeup
box may be moved to the right side of the furnace to facilitate
installation. If the make up box is moved to the right side,
clip the wire ties that bundle the wires together. The excess
wire must be pulled into the blower compartment. Secure
the excess wire to the existing harness to protect it from
damage. Seal unused openings on left side with plugs
removed from right side.
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. See
table for maximum over-current protection.
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 the 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 40 and Table 11. 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/HFPA No. 70) for the USA
and current Canadian Electric Code Part 1 (CSA
standard C22.1) for Canada. A green ground wire is
provided in the field make up box.
7. One line voltage “EAC” 1/4” spade terminal is provided
on the furnace integrated control. Any electronic air
cleaner or other 120V 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 45 for location of terminal. This
terminal is energized when the indoor blower is
operating.
A97USMV Model
Maximum Over Current
Protection (Amps)
070B12, 090C12, 090C16 15
090C20, 110C20, 135D20
20
Table 8