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Step 10—Install Electrical Connections
The unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of serious injury
if an electrical fault should occur. This ground may consist of
an electrical wire connected to the unit ground lug in the
control compartment, or conduit approved for electrical
ground when installed in accordance with NEC (National
Electrical Code) ANSI/ NFPA 70 (latest edition) (in Canada,
Canadian Electrical Code CSA [Canadian Standards Associa-
tion] C22.1) and local electrical codes. Do not use gas piping
as an electrical ground. Failure to adhere to this warning
could result in serious injury or death.
Failure to follow these precautions could result in damage to
the unit being installed:
1. Make all electrical connections in accordance with NEC
ANSI/NFPA 70 (latest edition) and local electrical codes
governing such wiring. In Canada, all electrical connec-
tions must be in accordance with CSA standard C22.1
Canadian Electrical Code Part 1 and applicable local
codes. Refer to unit wiring diagram.
2. Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit. DO
NOT USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within operating
voltage range indicated on unit rating plate.
4. Do not damage internal components when drilling through
any panel to mount electrical hardware, conduit, etc.
5. On 3-phase units, ensure phases are balanced within 2%.
Consult local power company for correction of improper
voltage and/or phase imbalance (refer to Table 5).
HIGH-VOLTAGE CONNECTIONS — The unit must have a
separate electrical service with a field-supplied, water-proof,
disconnect switch mounted at, or within sight from the unit. Refer
to the unit rating plate for maximum fuse/ circuit breaker size and
minimum circuit amps (ampacity) for wire sizing. See Table 5 for
electrical data.
The field-supplied disconnect switch box may be mounted on the
unit over the high-voltage inlet hole when the standard power and
low-voltage entry points are used. See Fig. 6 and 7 for acceptable
location.
See unit wiring label and Fig. 16 for reference when making high
voltage connections. Proceed as follows to complete the high-
voltage connections to the unit.
Single phase units:
1. Run the high-voltage (L1, L2) and ground leads into the
control box.
2. Connect ground lead to chassis ground connection.
3. Connect L1 to pressure lug connection 11 of the compressor
contactor.
4. Connect L2 to pressure lug connection 23 of the compressor
contactor.
Three phase units:
1. Run the high-voltage (L1, L2, L3) and ground leads into the
control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the lines side
of the contactor.
4. Connect field L1 to black wire on connection 11 of the
compressor contactor.
5. Connect field wire L2 to yellow wire on connection 13 of the
compressor contactor.
6. Connect field wire L3 to Blue wire from compressor.
SPECIAL PROCEDURES FOR 208-V OPERATION
Make sure that the gas supply then the power supply to the
unit is switched OFF before making any wiring changes.
Electrical shock or explosion could cause serious injury or
death.
With disconnect switch open, move yellow wire from transformer
(3/16 in.) terminal marked 230 to terminal marked 200. This retaps
transformer to primary voltage of 208 vac.
11
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