Electrical - Lennox 12HPB Series Installation Instructions Manual

If unit coil cannot be mounted away from prevailing winter
winds, a wind barrier should be constructed. Size the barri-
er at least the same height and width as outdoor unit. Mount
barrier 24 inches (610 mm) from the sides of the unit in the
direction of prevailing winds.
Rooftop Application
Wind Barrier ConstrucTion
prevailing winter winds
wind barrier
inlet air
Figure 3

Electrical

In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).
Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
inlet air
inlet air
inlet air
Unit must be grounded in accordance with national
and local codes.
Electric Shock Hazard.
Can cause injury or death.
1 − Install line voltage power supply to unit from a properly
sized disconnect switch.
2 − Ground unit at unit disconnect switch or to an earth
ground.
NOTE − To facilitate conduit, a hole is in the bottom of
the control box. Connect conduit to the control box us
ing a proper conduit fitting.
NOTE − Units are approved for use only with copper
conductors.
24V, Class II circuit connections are made in the low
voltage junction box. Refer to figure 4 for field wiring
diagram.
NOTE − A complete unit wiring diagram is located in
side the unit control box cover.
3 − Install room thermostat (ordered separately) on an in-
side wall approximately in the center of the conditioned
area and 5 feet (1.5 m) from the floor. It should not be
installed on an outside wall or where it can be effected
by sunlight, drafts or vibrations.
4 − Install low voltage wiring from outdoor to indoor unit and
from thermostat to indoor unit. See figures 5 and 6.
Page 4
WARNING