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Step 8 — Install Electrical Connections
WARNING
!
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.
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 Figure 2 and Figure 3
for acceptable location.
See unit wiring label (Figure 12 and Figure 13) and Figure 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.
51901190402
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
Figure 10 - - High- - and Control- -Voltage Connections
5. Connect field wire L2 to yellow wire from 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 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 eight low voltage thermostat leads in 24 volt splice
box. See Figure 10 for connection diagram. Run the
low--voltage leads from the thermostat, through the control
wiring inlet hole grommet (Figure 2 and Figure 3), and into the
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
BLU (DH)
DH
PINK (Y2)
Y2
L13P008
9
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