Installation guide

PROCEDURE 10--INSTALL ELECTRICAL CONNECTIONS
WARNING: 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 (latest edition) and local electrical codes. In Canada, follow Canadian Electrical Code CSA
(Canadian Standards Association) C22.1 and local electrical codes. Failure to adhere to this warning could result in serious
injury or death.
A CAUTION: 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 (latest edition) and local electrical codes governing
such wiring, in Canada, all electrical connections 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. On 3-phase units,
ensure phases are balanced within 2 percent. Consult local power company for correction of improper voltage and/or phase
imbalance.
A. HIGH-VOLTAGE CONNECTIONS
The unit must have a separate electrical service with a field-supplied, waterproof, 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 Tables 4 and 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. 2 and 3 for acceptable locution).
See unit wiring label and Fig. 11 for reference when making high voltage connections. Proceed as follows to complete the high-voltage connections
to the unit.
HIGHVOLTAGE r- - - -
POWER LEADS 4¢c-
(SEE UNIT WIRING
LABEL) _-
GND
CONTROL BOX
O-
LOW-VOLTAGE _ O-
POWER LEADS-
(SEE UNIT O-
WIRING LABEL) _O-
SPLICE BOX
m
--_--
FIELD-SUPPLIED
FUSED DISCONNECT
_G_RN_(G_)_ (TTHy_IRcMAOL_TAT
Fig. 11--High- and Control-Voltage Connections
Single phaseunits:
I. Run the high*voltage (LI, L2) and ground leads into the control box.
2. Connect ground lead to chassis ground connection.
3. Connect LI to pressure lug connection I 1 of the compressor contactor.
4. Connect L2 to pressure lug connection 23 of the compressor contactor.
Three-phase units:
I. Run the high-voltage (LI, 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 LI 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.
C99018
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