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4. Voltage to compressor terminals during operation must

be within voltage range indicated on unit nameplate (also
see Table 2). Voltages between phases must be balanced
within 2% and the current within 10%. Use the formula
shown in Table 2, Note 3, to determine the percent volt-
age imbalance. Operation on improper line voltage or
excessive phase imbalance constitutes abuse and may
cause damage to electrical components. Such operation
would invalidate any applicable warranty.

5. Insulate low-voltage wires for highest voltage con-

tained within conduit when low-voltage control wires are
run in same conduit as high-voltage wires.

6. Do not damage internal components when drilling through

any panel to mount electrical hardware, conduit, etc.

High-Voltage Field Power Wiring Connections (Fig. 13)

The unit must have a separate electrical service with a field-
supplied, waterproof, fused 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. Be sure disconnect switch does not
obstruct unit rating plate.

The field-supplied disconnect switchbox may be mounted on
the unit over the high-voltage inlet hole in the control corner
panel.

Proceed as follows to complete the high-voltage connections
to the unit:

1. Connect ground lead to chassis ground connection when

using separate ground wire.

2. Unit has a terminal block for field power connections.

Install conduit connectors in side panel power supply
knockout openings indicated in Fig. 2 and 3. Route power
lines through connector to unit control box.

Special Procedures for 208-V Operation

DANGER:

Make sure that the power supply to the

unit is switched off before making any wiring changes.
Electrical shock can cause personal injury or death.

For operation on 208 v:

1. Remove the cap from the splice containing the orange

(230 v) transformer primary lead and 2 black wires. See
unit wiring diagram.

2. Remove cap from the red (208 v) transformer primary

lead.

3. Use cap from red lead to splice red lead and 2 black wires

together.

4. Cap the orange lead.

5. Check to be sure no copper wire is left exposed at both

caps.

Control Voltage Connections (Fig. 14)

Install a factory-approved room thermostat. Refer to unit Trade
Prices or contact your local representative for more informa-
tion. Locate the thermostat on an inside wall in the space to
be conditioned where it will not be subjected to either a cool-
ing or heating source or direct exposure to sunlight. Mount
the thermostat 4 to 5 ft above the floor.

NOTE:

For wire runs up to 50 ft, use no. 18 AWG (American

Wire Gage) insulated wire (35 C minimum). For 51 to 75 ft,
use no. 16 AWG insulated wire (35 C minimum). For 76 to
155 ft, use no. 14 AWG insulated wire (35 C minimum). All
wire larger than no. 18 AWG cannot be connected directly to
the thermostat and will require a junction box and splice at
the thermostat.

Heat Anticipator Setting

The room thermostat heat anticipator must be properly ad-
justed to ensure proper heating performance. Set the heat
anticipator to settings in Table 3.

Failure to make a proper heat anticipator adjustment may
result in improper operation, discomfort to the occupants of
the conditioned space, and inefficient energy utilization; how-
ever, the required setting may be changed slightly to provide
a greater degree of comfort for a particular installation.

LEGEND

EQUIP GND — Equipment Ground
kcmil

— Thousand Circular Mils

NEC

— National Electrical Code

— Terminal Block

NOTE: The maximum wire size for TB1 is 350 kcmil for all unit voltages.

Fig. 13 — Field Power Wiring Connections

Fig. 14 — Field Control Thermostat Wiring

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