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power wiring hole (Figure 7, page 7). Connect L1 & L2
directly to the contactor.

• The unit requires both power and control circuit electrical

connections. Refer to the wiring diagram / schematic
(Figures 10 - 12, pages 13 - 15) for identification and
location of unit field wiring interfaces. Make all electrical
connections in accordance with all applicable codes
and ordinances.

• Overcurrent protection must be provided at the branch

circuit distribution panel and sized as shown on the unit
rating label and according to applicable local codes.
See the unit rating plate for minimum circuit ampacity
and maximum overcurrent protection limits.

• Use only copper wire for the line voltage power supply

to this unit as listed in Table 1. Use proper code agency
listed conduit and a conduit connector for connecting
the supply wires to the unit. Use of rain tight conduit is
recommended.

• 208/230 Volt units are shipped from the factory wired

for 230 volt operation. For 208V operation, remove the
lead from the transformer terminal marked 240V and
connect it to the terminal marked 208V.

• Optional equipment requiring connection to the power

or control circuits must be wired in strict accordance of
the NEC (ANSI/NFPA 70), applicable local codes, and
the instructions provided with the equipment.

Grounding

WARNING:

The unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
injury if an electrical fault should occur. Do not
use gas piping as an electrical ground!

This unit must be electrically grounded in accordance
with local codes or, in the absence of local codes, with the

National Electrical Code (ANSI/NFPA 70) or CSA C22.1
Electrical Code. Ground the air conditioning unit using
the green grounding screw provided in the control panel.

Overcurrent Protection

Generally, the best fuse or breaker for any air conditioner
is the smallest size that will permit the equipment to run
under normal usage and provide maximum equipment
protection. Properly sized fuses and breakers also prevent
nuisance trips during unit startup.

If a fuse blows or a

breaker trips, always determine the reason. Do not
arbitrarily install a larger fuse or breaker and do not,
in any case, exceed the maximum size listed on the
data label of the unit.

Thermostat / Low Voltage Connections

• The unit is designed to operate from a 24 VAC Class

II control circuit. The control circuit wiring must comply
with the current provisions of the NEC (ANSI/NFPA
70) and with applicable local codes having jurisdiction.
Thermostat connections should be made in accordance
with the instructions supplied with the thermostat and
the indoor equipment.

• The low voltage wires must be properly connected. Route

24V control wires through the sealing grommet (Figure
7, page 7) near the power entrance. Recommended
wire gauge and wire lengths for typical thermostat
connections are listed in Table 2 (page 9).

• Single stage or two-stage heating thermostats can

be used with this equipment depending on optional
accessories installed with the unit. Select a thermostat
that operates in conjunction with the installed
accessories.

• The thermostat should be mounted about 5 feet above

the floor on an inside wall. DO NOT install the thermostat
on an outside wall or any other location where its
operation may be adversely affected by radiant heat
from fireplaces, sunlight, lighting fixtures or convective
heat from warm air registers or electrical appliances.
Refer to the thermostat manufacturer’s instruction sheet
for detailed mounting information.

Cooling Only Thermostat
Connect the

red

yellow

wires from the unit to the

terminals on the thermostat subbase. Connect the

green

wire to the

yellow

wire at the unit. See Figure 8.

Heat / Cool Thermostat
For the highest efficiency, the use of a 2-stage Heating/
Cooling thermostat is recommended. The heat/cool
thermostat prevents simultaneous operation of the heating
and cooling units and is equipped with an ON-AUTO fan
mode that allows the home owner to operate the indoor
blower when only air circulation is desired.
Connect the red, yellow, green and brown/orange low
voltage wires to the