9
513 01 3103 00
Step 8 — Install Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
The unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of personal injury if
an electrical fault should occur. This ground may consist of an
electrical wire connected to the unit ground screw in the
control compartment, or conduit approved for electrical ground
when installed in accordance with NFPA 70 (NEC) (latest
edition) (in Canada, Canadian Electrical Code CSA C22.1)
and local electrical codes.
!
WARNING
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 NEC
NFPA 70 (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 c odes. 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.
!
CAUTION
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. 4 and 5 for
acceptable location.
See unit wiring label (Fig. 12--17) 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 on connection 11 of the
compressor contactor.
5. Connect field wire L2 to yellow wire on connection 23 of the
compressor contactor.
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 on connection 11 of the
compressor contactor.
5. Connect field wire L3 to yellow wire on connection 13 of the
compressor contactor.
6. Connect field wire L2 to blue wire from compressor.
FIG. 10 -- HIGH-- AND CONTROL--VOLTAGE
CONNECTIONS
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL
)
EQUIP GR
CONTROL BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
W1
Y
G
R
C
WHT(W1)
YEL(Y)
GRN(G)
RED(R)
BRN(C)
THERMOSTAT
(TYPICAL
)
3-PHASE SHOWN
1-PHASE USES
TWO POWER
LEADS
W2
VIO (W2)
SPLICE BOX
DH
BLU (DH)
GRA (Y2)
3-Phase
Only
Special Procedures for 208--V Operation
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. Tag the disconnect switch with
a suitable warning label. With disconnect switch open,
move black wire from transformer (3/16 in., 4.8mm)
terminal marked 230 to terminal marked 200. This
retaps transformer to primary voltage of 208 vac.
!
WARNING
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 (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
Connections
Locate the seven (eight for 3--phase) low voltage thermostat leads
in 24 volt splice box. A gray wire is standard on 3--phase units for
connection to an economizer. 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. Factory wires are provided for
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