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 gov-
erning 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 all
3-phase units, ensure phases are balanced within 2%.
Consult local power company for correction of improper
voltage and/or phase imbalance.
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 3 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
location).
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.
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 power supply to the unit is switched OFF
before making any wiring changes. 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. Electrical shock could cause
serious injury or death.
CONTROL VOLTAGE CONNECTIONS
NOTE:
Do not use any type of power-stealing thermostat. Unit
control problems may result.
Use no. 18 American Wire Gage (AWG) color-coded, insulated
(35 C minimum) wires to make the control voltage connections
between the thermostat and the unit. If the thermostat is located
more than 100 ft from the unit (as measured along the control
voltage wires), use no. 16 AWG color-coded, insulated (35 C
minimum) wires.
STANDARD CONNECTION — Remove knockout hole located
in the electric heat panel adjacent to the service access panel (See
Fig. 2 and 3). Remove the rubber grommet from the installer’s
packet (included with unit) and install grommet in the knockout
opening. Provide a drip loop before running wire through panel.
Run the low-voltage leads from the thermostat, through the inlet
hole, and into unit low-voltage splice box.
Locate five 18-gage wires leaving control box. These low-voltage
connection leads can be identified by the colors red, green, yellow,
brown, and white (See Fig. 8). Ensure the leads are long enough to
be routed into the low-voltage splice box (located below right side
of control box). Stripped yellow wire is located in connection box.
Route leads through hole in bottom of control box and make
low-voltage connections (See Fig. 11). Secure all cut wires, so that
they do not interfere with operation of unit.
TRANSFORMER PROTECTION — The
transformer
is of the
energy-limiting type. It is set to withstand a 30-sec overload or
shorted secondary condition.
Fig. 11—High- and Control-Voltage Connections
C99010rev2
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
GND
CONTROL BOX
SPLICE BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
Y
G
R
C
YEL(Y)
GRN(G)
RED(R)
BRN(C)
THERMOSTAT
(TYPICAL)
LEGEND
Field Control-Voltage Wiring
Field High-Voltage Wiring
9
