V.STEP 5 — MAKE ELECTRICAL CONNECTIONS
WARNING: Unit cabinet must have an uninter- rupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when installed in accordance with NEC (National Electrical Code), ANSI/NFPA (American National Standards Institute/National Fire Protection Association), latest edition, and local electrical codes. Failure to follow this warning could result in the installer being liable for personal injury of others.
A. Field Power Supply
All units except
Refer to unit label diagram for additional information. Pig- tails are provided for field wire connections.
When installing units, provide a disconnect per NEC. Use copper conductors only when splice connectors are used.
NOTE: When accessory
All field wiring must comply with NEC and local require- ments. In Canada, electrical connections must be in accor- dance with CSA (Canadian Standards Association) C22.1 Canadian Electrical Code Part One.
Install field wiring as follows (see Fig.
1.Install conduit through side panel openings between disconnect and single point box (see Fig. 9 and 10).
2.Install power wires to terminal connections as shown in Fig. 8.
Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate (see Tables
B. Field Control Wiring
Install a
Route thermostat cable or equivalent single leads of colored wire from subbase terminals to
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insulated wire (35 C minimum). For over 75 ft, use no. 14 AWG insulated wire (35 C minimum). All wire larger than no. 18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat.
1.If unit is mounted on roof curb and accessory thru-
2.Pass control wires through the hole provided on unit (see connection D, Connection Sizes Table, Fig. 7A and 7B).
3.Feed wire through the raceway built into the corner post to the
4.Connect thermostat wires to screw terminals of low- voltage terminal board.
5.If unit is to be equipped with electric resistance heat, ensure thermostat on a call for heat “W” energizes “G” output. This allows fan operation on a call for heat.
(150,151)
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| LEGEND |
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C | — Contactor | Terminal Block | |
COMP(S) | — | Compressor(s) | Connection |
IFC | — | Indoor (Evaporator) | Splice Connection |
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| Fan Contactor | |
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| |
NEC | — National Electrical Code | Field Wiring | |
TB | — Terminal Block | Factory Wiring |