Table of Contents
Advertisement
• Line voltage to the unit should be supplied from a
dedicated branch circuit containing the correct fuse
or circuit breaker for the unit. Incoming fi eld wiring
and minimum size of electrical conductors and circuit
protection must be in compliance with information
listed on the unit data label. Any other wiring methods
must be acceptable to authority having jurisdiction.
• Provide power supply for the unit in accordance with
the unit wiring diagram, and the unit rating plate.
Connect the line-voltage leads to the terminals on
the contactor inside the control compartment. Extend
leads through power wiring hole (Figure 6). Connect
L1 & L2 directly to the contactor.
• The unit requires both power and control circuit
electrical connections. Refer to the wiring diagram /
schematic for identifi cation and location of unit fi eld
wiring interfaces (Figures 12 & 13, pages 16 & 17).
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.
Line Voltage
Low Voltage
Figure 6. Power Entry
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.
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 1. 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
9
Advertisement
Table of Contents
