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X. MAKE ELECTRICAL CONNECTIONS
WARNING: To avoid personal injury or death, do not
supply power to unit with compressor terminal box cover
removed.
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits shown
on unit rating plate. Contact local power company to correct
improper voltage. See unit rating plate for recommended circuit
protection device.
NOTE: Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability. See unit rating plate. Do not
install unit in system where voltage may fluctuate above or below
permissible limits.
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.
A. 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.
WARNING: The unit cabinet must have an uninter-
rupted 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. Failure to
follow this warning can result in an electric shock, fire, or
death.
B. Connect Ground and Power Wires
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 12.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
FIELD POWER
WIRING
FIELD GROUND
WIRING
Fig. 12—Line Power Connections
C. Connect Control Wiring
Route 24-v control wires through control wiring grommet and
connect leads to control wiring. (See Fig. 13.)
Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If
thermostat is located more than 100 ft 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 trans-
former for control power, 24-v/40-va minimum.
NOTE: Use of available 24-v accessories may exceed the mini-
mum 40-va power requirement. Determine total transformer load-
ing and increase the transformer capacity or split the load with an
accessory transformer as required.
CONTACTOR
GROUND
LUG
A91056
—6—
D. Final Wiring Check
IMPORTANT: Check factory wiring and field wire connections
to ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.
XI. COMPRESSOR CRANKCASE HEATER
When equipped with a crankcase heater, furnish power to heater a
minimum of 24 hr before starting unit. To furnish power to heater
only, set thermostat to OFF and close electrical disconnect to
outdoor unit.
A crankcase heater is required in long-line applications (tubing
greater than 50 ft horizontal and/or elevation greater than 20 ft
vertical) between indoor and outdoor units. Refer to the Applica-
tion Guideline and Service Manual for Residential Split-System
Air Conditioners and Heat Pumps Using Puron Refrigerant.
XII. INSTALL ELECTRICAL ACCESSORIES
Refer to the individual instructions packaged with kits or acces-
sories when installing.
XIII. START-UP
CAUTION: To prevent compressor damage or personal
injury, observe the following:
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pressure.
• Do not disable low-pressure switch.
In scroll compressor applications:
• Dome temperatures may be hot.
HP THERMOSTAT
24 VAC HOT
R
C
24 VAC COM
HEAT STAGE 2
W2
COOL/HEAT
Y
STAGE 1
G
INDOOR FAN
RVS COOLING
O
EMERGENCY
E
*
HEAT
Fig. 13—Generic Wiring Diagram
(Set Thermostat Installation Instructions for
wiring
specific unit combinations.)
LEGEND
24-V FACTORY WIRING
24-V FIELD WIRING
FIELD SPLICE CONNECTION
ODT
OUTDOOR THERMOSTAT
EMERGENCY HEAT RELAY
EHR
SHR
SUPPLEMENTAL HEAT RELAY
TYPICAL
HEAT
FAN COIL
PUMP
R
R
C
C
*
W2
W2
*
E
Y
*
W3
G
O
IF AVAILABLE
A02325
A97413
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