Installation guide

INST ALLATION INSTRUCTIONS R- 410A Split System Air Conditioner
14 421 01 5103 05
ELECTRICAL WIRING
(for *4A3, sizes 24 and 30 only)
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. 16.
Figure 16
Outdoor Air Thermistor (OAT) Attachment
OAT Thermistor must be locked in place
with spherical nib end facing towards
the front of the contr ol 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. 17.
Check to make s ure the thermistor is securely attached on
the liquid tube with the clip as shown in Fig. 17.
Figure 17
Outdoor Coil Thermistor (OCT) Attachment
OCT Thermistor must be
secured tight on the liquid tube.
Start- Up
CAUTION
!
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
To prevent compressor damage or personal injury,
observe the following:
S Do not overcharge system with refrigerant.
S Do not operate unit in a vacuum or at negative
pressure.
S Do not disable low pressure switch in scroll compressor
applications.
S Dome temperatures may be hot.
CAUTION
!
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Wear safety glasses, protective clothing, and gloves
when handling refrigerant and observe the following:
S Front seating service valves are equipped with
Schrader valves.
CAUTION
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent refrigerant
to the atmosphere. Recover during system repair or final
unit disposal.
Follow these steps to properly start up the
system:
1. After system is evacuated, fully open liquid and vapor
service valves.
2. Unit is shipped with valve stem(s) front seated (closed)
and caps installed.