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• The unitrequires both powerand c ontrol circuitelectrical
connections. Refertothewiringdiagram
/ schematic
(Figures 11 & 12, pages 14 & 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.
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.
COPPER WIRE SIZE m AWG
(1% Voltage Drop)
Supply Wire Length-Feet
Supply Circuit
200
150
100
50
Ampacity
6
8
10
14
15
4
6
8
12
20
4
6
8
10
25
4
4
6
10
30
3
4
6
8
35
3
4
6
8
40
2
3
4
6
45
2
3
4
6
50
2
3
4
6
55
1
2
3
4
60
Wire Size based on N.E.C. for 60 ° type copper conductors.
Table 1. Copper Wire Size
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.
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 con nected. Route
24V control wires through the sealing grommet (Figure
8, page 8) near the power entrance. Recommended
wire gauge and wire lengths for typical thermostat
connections are listed in Table 2 (page 10).
• Single stage or two-stage thermostats
can be used
with this equipment depending on optional accessories
(i.e. economizer)
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.
Coolinq Only Thermostat
Connect the red & yellow wires from the unit to the R & Y
terminals on the thermostat subbase. Connect the green
wire to the yellow wire at the unit. See Figure 9 (page 10).
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 R or Re, Y, G, W or W2 (if applicable) terminals on
the thermostat base. The black wire is the 24 volt common
required on some thermostats. See Figure 9.
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