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505328M 06/09
Table 2. Wire Run Length
Wire Run Length
AWG #
Insulation Type
less than 100’ (30m)
18
color−coded, temperature
rating 35
º
C minimum
more than 100’ (30m)
16
1. Install room thermostat (ordered separately) on an
inside wall approximately in the center of the area and
5 feet (1.5 m) from the floor. Do not install on an outside
wall or where sunlight, drafts or vibrations affect it.
2. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit as illustrated in
figure 14.
3. Install line voltage power supply to unit from a properly
sized disconnect switch as illustrated in figure 15.
4. Ground unit from ground lug as illustrated in figure 15
to unit disconnect switch, or to an earth ground.
Figure 14. Typical Low−Voltage Field Wiring
GROUND LUG
DEFROST CONTROL
BOARD (DCB)
LENNOX SYSTEM OPERATION
MONITOR (LSOM)
CAPACITOR
GROUND LUG
CONTACTOR
K1−1 COMPRESSOR CONTACTOR
GROUND
L2
208−230/60/1
L1
READ WARNING AND NOTE
WARNING! − ELECTRIC SHOCK HAZARD. Can cause INJURY or DEATH. Unit must be grounded in accordance with national and local codes.
NOTE − For use with copper conductors only. Refer to unit rating plate for minimum circuit ampacity and maximum over-current protection size.
CONTROL BOX
Figure 15. Typical High−Voltage Field Wiring (Unit Panel)
