INSTALLATION INSTRUCTIONS
R
−
410A Split System Air Conditioner
6
421 01 5104 02
Specifications subject to change without notice.
!
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 and Power Wires
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 5.
Figure 5
Line Power Connections
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
CONTACTOR
GROUND
LUG
FIELD GROUND
WIRING
FIELD POWER
WIRING
Connect Control Wiring
Route 24
−
v control wires through control wiring grommet and
connect leads to control wiring. (See Fig. 10 & Fig. 11)
Use No. 18 AWG color
−
coded, insulated (35
_
C minimum)
wire. If thermostat is located more than 100 ft. (30.48 m)
from unit, as measured along the control voltage wires, use
No. 16 AWG color
−
coded, insulated 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, 24
−
v/40
−
va minimum.
NOTE
: Use of available 24
−
v accessories may exceed the
minimum 40
−
va power requirement. Determine total
transformer load and increase the transformer capacity or
split the load with an accessory transformer as required.
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.
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 for low
−
ambient cooling or if
refrigerant tubing is longer than 80 ft. (24.38 m). Refer to the
Long Line Applications Guideline
−
Residential Split
−
System
Air Conditioners and Heat Pumps Using R
−
410A Refrigerant.
Install Electrical Accessories
Refer to the individual instructions packaged with kits or
accessories when installing.
Check OAT Thermistor and OCT Thermistor
Attachments
Outdoor Air Temperature (OAT) Thermistor is factory installed
by inserting the nibs on either sides of the thermistor body
through a keyhole in the bottom shelf of the control box and
locking it in place by turning it 90 degrees, such that the
spherical end of a nib faces the front of the control box.
Check to make sure the OAT is locked in place. See Fig. 6.
Figure 6
Outdoor Air Thermistor (OAT) Attachment
OAT Thermistor must be locked in place
with spherical nib end facing towards
the front of the control box
DX+ DX- C R
The Outdoor Coil Temperature (OCT) Thermistor is factory
installed on the liquid tube between the coil assembly and the
liquid service valve. See Fig. 7.
Check to make sure the thermistor is securely attached on
the liquid tube with the clip as shown in Fig. 7.
Figure 7
Outdoor Coil Thermistor (OAT) Attachment
OCT Thermistor must be
secured tight on the liquid tube.
