Electrical Connections - Lennox LCH036 Installation Instructions Manual

Electrical Connections

POWER SUPPLY
WARNING
Do not apply power or close disconnect switch until
installation is complete. Refer to start-up directions.
Refer closely to unit wiring diagram.
Refer to unit nameplate for minimum circuit ampacity
and maximum fuse size.
1- Units are factory-wired for 230/460/575 volt supply.
For 208V supply, remove the insulated terminal
cover from the 208V terminal on the control
transformer. Move the wire from the transformer
230V terminal to the 208V terminal. Place the
insulated terminal cover on the unused 230V
terminal.
2- Route power through the bottom power entry area
and connect to line side of unit disconnect, circuit
breaker or terminal block. See unit wiring diagram.
3- Units With Optional 120v GFCI Outlet -
Route and connect separate 120v wiring to GFCI
outlets which do not have factory-installed wiring.
CONTROL WIRING
A-Thermostat Location
Room thermostat mounts vertically on a standard 2" X 4"
handy box or on any non-conductive flat surface.
Locate thermostat approximately 5 feet (1524mm)
above the floor in an area with good air circulation at
average temperature. Avoid locating the room
thermostat where it might be affected by:
FILTERS
LEFT
FILTER
SEAL
RIGHT
FILTER
SEAL
FIGURE 10
-drafts or dead spots behind doors and in corners
-hot or cold air from ducts
-radiant heat from sun or appliances
-concealed pipes and chimneys
B-Wire Routing
Route thermostat cable or wires from subbase through
knockout provided in unit. For thermostat wire runs up to
60 feet, use 18 gauge wire. For 60 to 90 feet runs, use 16
gauge wire.
IMPORTANT - Unless field thermostat wires are rated
for maximum unit voltage, they must be routed away
from line voltage wiring.
C-Wiring Connections
The Unit Controller will operate the unit from a
thermostat or zone sensor based on the System Mode.
The default System Mode is the thermostat mode. Refer
to the Unit Controller Installation and Setup Guide to
change the System Mode.
1- Default Thermostat Mode -
The Unit Controller will operate two stages of heating
and cooling based on thermostat demands. Install
thermostat assembly in accordance with instructions
provided with thermostat. See figure 11 for field wiring
and wiring diagrams on unit.
IMPORTANT-Terminal connections at the wall plate or
subbase must be made securely. Loose control wire
connections may result in intermittent operation.
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