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(Figures 11 & 12, pages 14 & 15)) for identifi cation and
location of unit fi eld 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 2. 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 — AWG
(1% Voltage Drop)
Supply Wire Length-Feet
200
150
100
6
8
10
4
6
8
4
6
8
4
4
6
3
4
6
3
4
6
2
3
4
2
3
4
2
3
4
1
2
3
Wire Size based on N.E.C. for 60° type copper conductors.
Table 2. Copper Wire Size
Supply Circuit
Ampacity
50
14
15
12
20
10
25
10
30
8
35
8
40
6
45
6
50
6
55
4
60
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 connected. 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 3 (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 fl oor 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 fi replaces, sunlight, or lighting fi xtures, and
convective heat from warm air registers or electrical
appliances. Refer to the thermostat manufacturer's
instruction sheet for detailed mounting information.
Optional Outdoor Thermostat
If two stage heating is desired, an outdoor thermostat
can be installed in the fi eld with 2-stage electric heat. To
install the outdoor thermostat, remove the orange wire
from the E terminal on the terminal block, and connect
to the outdoor thermostat. Connect the other side of the
outdoor thermostat to W2 from the thermostat.
Cooling Thermostat
Connect the red and yellow wires from the unit to the R
and Y terminals respectively 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 effi ciency, the use of a 2-stage Heating/
Cooling thermostat is recommended. The heat/cool
9
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