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Make Electrical Connections
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
Do not supply power to unit with compressor terminal box
cover removed.
NOTE: Use copper wire only between disconnect switch and unit.
NOTE: Install branch circuit disconnect of adequate size per NEC
to handle unit starting current. Locate disconnect within sight from
and readily accessible from unit, per Section 440–14 of NEC.
Route Ground and Power Wires
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into unit
control box.
Connect Ground and Power Wires
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault should
occur. The ground may consist of electrical wire or metal
conduit when installed in accordance with existing electrical
codes.
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 8.
DISCONNECT
PER N.E.C. AND/OR
LOCAL CODES
FIELD POWER
WIRING
3 PHASE ONLY
FIELD GROUND
WIRING
Fig. 8 - - Line Connections
Fig. 9 - - 3–Phase Monitor Control
(Applies to 3–Phase Units Only)
CONTACTOR
BLUE
GROUND
LUG
A94025
A00010
Table 3 – 3–Phase Monitor LED Indicators
LED
OFF
FLASHING
ON
Connect Control Wiring
Route 24v control wires through control wiring grommet and
connect leads to control wiring. See Thermostat Installation
Instructions for wiring specific unit combinations. (See Fig. 10.)
Use No. 18 AWG color–coded, insulated (35°C minimum) wire. If
thermostat is located more than 100 ft (30.5 m) from unit, as
measured along the control voltage wires, use No. 16 AWG
color–coded wire to avoid excessive voltage drop.
All wiring must be NEC Class 1 and must be separated from
incoming power leads.
Use furnace transformer, fan coil transformer, or accessory
transformer for control power, 24v/40va minimum.
NOTE:
Use of available 24v accessories may exceed the
minimum 40va power requirement. Determine total transformer
loading and increase the transformer capacity or split the load with
an accessory transformer as required.
HP THERMOSTAT
24 VAC HOT
R
C
24 VAC COM
W2
HEAT STAGE 2
COOL/HEAT
Y
STAGE 1
INDOOR FAN
G
RVS COOLING
O
EMERGENCY
E
HEAT
24-V FACTORY WIRING
24-V FIELD WIRING
FIELD SPLICE CONNECTION
ODT
OUTDOOR THERMOSTAT
EMERGENCY HEAT RELAY
EHR
SUPPLEMENTAL HEAT RELAY
SHR
Fig. 10 - - Generic Wiring Diagrams
(See thermostat Installation Instructions
for specific unit combinations)
5
STATUS
No call for compressor operation
Reversed phase
Normal
TYPICAL
HEAT
FAN COIL
PUMP
R
R
C
C
*
W2
W2
*
E
Y
*
W3
G
O
*
IF AVAILABLE
LEGEND
A02325 / A97413
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