Page 21
INTERIOR MAKE-UP BOX INSTALLATION
BOX
Right Side
FIGURE 21
WARNING
Fire Hazard. Use of aluminum wire with this product may
result in a re, causing property damage, severe injury
or death. Use copper wire only with this product.
Refer to FIGURE 22 for schematic wiring diagram, eld
wiring and trouble shooting.
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.
CAUTION
Failure to use properly sized wiring and circuit breaker
may result in property damage. Size wiring and circuit
breaker(s) per Product Specications bulletin (EHB) and
unit rating plate.
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 o for servicing.
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 and eld wiring diagram shown in
FIGURE 22. 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 Na-
tional Electric Code (ANSI/NFPA No. 70). A green ground
wire is provided in the eld make-up box.
NOTE - The EL180UHNE furnace contains electronic
components that are polarity sensitive. Make sure that the
furnace is wired correctly and is properly grounded.
WARNING
Electric Shock Hazard. Can cause injury or death. Unit
must be properly grounded in accordance with national
and local codes.
Accessory Terminals
One line voltage “EAC” 1/4” spade terminal is provided
on the furnace integrated control. See FIGURE 24 for in-
tegrated control conguration. 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 pro-
vided 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 24 for in-
tegrated control conguration. This terminal is energized
in the heating mode when the combustion air inducer is
operating. Any humidier rated up to one amp can be con-
nected to this terminal with the neutral leg of the circuit be-
ing connected to one of the provided neutral terminals. If
a humidier rated at greater than one amp is connected to
this terminal, it is necessary to use an external relay relay.
One 24V ”H” 1/4” spade terminal is provided on the fur-
nace integrated control. See FIGURE 24 for integrated
control conguration. The terminal is energized in the
heating mode when the combustion air inducer is operat-
ing and the pressure switch is closed. Any humidier rated
up to 0.5 amp can be connected to this terminal with the
ground leg of the circuit connected to ground or the ”C”
terminal.
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 po-
larity and proper ground. Both polarity and proper
grounding should be checked before attempting to
operate the furnace on either permanent or tempo-
rary power.
• Generator should have a wave form distortion of
less than 5% total harmonic distortion.
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