Lennox EL180UHE - Electrical Grounding and Wiring

Page 23
INTERIOR MAKE-UP BOX INSTALLATION
BOX
Right Side
Figure 28
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 gure 29 for schematic wiring diagram, eld wir-
ing 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 Specications 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 off 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
gure 29. 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 EL180UHE furnace contains electronic com-
ponents that are polarity sensitive. Make sure that the fur-
nace 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 gure 30 for integrated
control conguration. 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 neu-
tral 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 gure 30 for integrat-
ed control conguration. This terminal is energized in the
heating mode when the combustion air inducer is operat-
ing. Any humidier rated up to one amp can be connect-
ed to this terminal with the neutral leg of the circuit being
connected to one of the provided neutral terminals. If a
humidier 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 gure 30 for integrated con-
trol conguration. The terminal is energized in the heating
mode when the combustion air inducer is operating and
the pressure switch is closed. Any humidier 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 polarity
and proper ground. Both polarity and proper grounding
should be checked before attempting to operate the fur-
nace on either permanent or temporary power.
• Generator should have a wave form distortion of less
than 5% total harmonic distortion.