To avoid personal injury or death, do not supply power to unit
with compressor terminal box cover removed.
NOTE:
Install branch circuit 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.
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. Failure to follow this warning can result in an
electrical shock, fire, or death.
ROUTE GROUND AND POWER WIRES — Remove access
panel and control box cover 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 — Connect ground
wire to ground connection in control box for safety. Connect
power wiring to contactor as shown in Fig. 4.
CONNECT CONTROL WIRING — Route 24-v control wires
through control wiring grommet and connect leads to control
wiring. (See Fig. 5.)
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
wires 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/40va 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.
Step 8—Compressor Crankcase Heater
When equipped with a crankcase heater, furnish power to heater a
minimum of 24 hrs before starting unit. To furnish power to heater
only, set thermostat to OFF position and close electrical disconnect
to outdoor unit.
A crankcase heater is required if the refrigerant tubing is longer
than 50 ft. Refer to Residential Split System Long-Line Applica-
tion Guideline.
Step 9—Install Electrical Accessories, If Any
Refer to the individual instructions packaged with the kit or
accessory when installing.
Table 2—Accessory Usage
ACCESSORY
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(BELOW 55°F)
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(OVER 50 FT)
REQUIRED FOR
SEA COAST
APPLICATIONS
(WITHIN 2 MILES)
Crankcase Heater
Yes
Yes
No
Evaporator Freeze Thermostat
Yes
No
No
Winter Start Control
Yes†
No
No
Accumulator
No
No
No
Compressor Start Assist
Capacitor and Relay
Yes
Yes
No
Low-Ambient Controller,
MotorMaster® Control,
or
Low-Ambient Pressure Switch
Yes
No
No
Wind Baffle
See Low-Ambient Instructions
No
No
Coastal Filter
No
No
Yes
Support Feet
Recommended
No
Recommended
Liquid-Line Solenoid Valve
or
Hard Shutoff TXV
No
See Long-Line
Application
Guideline
No
Ball Bearing Fan Motor
Yes‡
No
No
* For tubing line sets between 50 and 175 ft, refer to Residential Split System Long-Line Application Guideline.
† Only when low-pressure switch is used.
‡ Required for Low-Ambient Controller (full modulation feaature) and MotorMaster Control only.
Fig. 4—Line Power Connections
A91056
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
CONTACTOR
GROUND
LUG
FIELD GROUND
WIRING
FIELD POWER
WIRING
4
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