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CAUTION
!
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the
unit being installed.
1. Make all electrical connections in accordance with
NFPA 70 (NEC) (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. On
3- -phase units, ensure phases are balanced within 2
percent. Consult local power company for correction of
improper voltage and/or phase imbalance.
4. Do not damage internal components when drilling
through any panel to mount electrical hardware, conduit,
etc.
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, NEC and local
codes for maximum fuse/circuit breaker size and minimum circuit
amps (ampacity) for wire sizing.
The field- -supplied disconnect 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 (Fig. 15, 17 and 18) and Fig. 10 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 lead into the
control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line side
of the contactor.
4. Connect field L1 to black wire from connection 11 of the
compressor contactor.
5. Connect field wire L2 to yellow wire from connection 23 of
the compressor contactor.
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
3-PHASE SHOWN
1-PHASE USES
TWO POWER
EQUIP GR
LEADS
CONTROL BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
SPLICE BOX
Fig. 10 - - High- - and Control- -Voltage Connections
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
WHT(W2)
W2
VIO (W3)
W3
YEL(Y1)
Y1
GRN(G)
G
THERMOSTAT
RED(R)
R
(TYPICAL )
BRN(C)
C
ORN(O)
O
DH WIRE IS ON
BLU (DH)
208/230 VAC MODELS
DH
ONLY.
PINK (Y2)
Y2
A13176
Three- -phase units:
1. Run the high- -voltage (L1, L2, L3) and ground lead into the
control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line side
of the contactor.
4. Connect field L1 to black wire from connection 11 of the
compressor contactor.
5. Connect field wire L3 to yellow wire from connection 13 of
the compressor contactor.
6. Connect field wire L2 to blue wire from compressor.
SPECIAL PROCEDURES FOR 208- - V OPERATION
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, always turn off main
power to system and install lockout tag. With disconnect
switch open, move black wire from transformer (3/16
in.)(4.8 mm) terminal marked 230 to terminal marked 208.
This retaps transformer to primary voltage of 208 vac.
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
(35C minimum) wires to make the control voltage connections
between the thermostat and the unit. If the thermostat is located
more than 100 ft (30.5 m) from the unit (as measured along the
control voltage wires), use no. 16 AWG color- -coded, insulated
(35 C minimum) wires.
STANDARD CONNECTION
Locate the nine low voltage thermostat leads (eight for 460 VAC
models) in 24 volt splice box. See Fig. 10 for connection diagram.
Run the low- -voltage leads from the thermostat, through the control
wiring inlet hole grommet (Fig. 2 and 3), and into the low- -voltage
splice box. Provide a drip loop before running wires through panel.
Secure and strain relief all wires so that they do not interfere with
operation of unit.
If an accessory electric heater is installed, low voltage leads from
heater must be connected to factory supplied control leads from
Indoor Fan Board P4 connector.
NOTE: If the unit 24V wires do not have a matching receptacle,
cut the 24V wires from the electric heater plug, strip the ends, and
wire nut together to match the schematic connections. If the electric
heater 24V wires do not have a matching plug, cut the 24V wires
from the unit receptacle, strip the ends, and wire nut together to
match the schematic connections.
Factory wires are provided for electric heat staging W1 and W2
(W2 and W3 on IFB). If room thermostat has only one stage of
supplemental heat, connect white and violet wires shown in Fig. 10
to second stage heat field wire.
Some electric heaters have four control wires (plus common wire).
Consult unit wiring diagram and electric heater wiring diagram for
additional details.
TRANSFORMER PROTECTION
The transformer is of the energy- -limiting type, however a direct
short will likely blow a secondary fuse. If an overload or short is
present, correct overload condition and check for blower fuse on
Indoor Fan Board. Replace fuse as required with correct size and
rating.
9
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