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INSTALLATION INSTRUCTIONS
Connect Control Wiring
Route 24--v control wires through control wiring grommet and
connect leads to control wiring. See Thermostat Installation
Instructions for wiring specific unit combinations.
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
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 if refrigerant tubing is longer
than 80 ft. (24.38 m). Refer to the Long Line Applications
Guideline.
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.7.
Figure 7
Outdoor Air Thermistor (OAT) Attachment
OAT Thermistor must be locked in place
with spherical nib end facing towards
the front of the control box
6
requirement.
Determine
total
DX+ DX--- C R
Specifications subject to change without notice.
R- -410A Split System Heat Pumps
The Outdoor Coil Temperature (OCT) Thermistor is factory
installed on the 3/8" diameter stub tube located on the coil
assembly. Check to make sure that it is securely attached
with the clip as shown in Fig. 8.
Figure 8
Outdoor Coil Thermistor (OCT) Attachment
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.
Replace stem caps after system is opened to
OCT Thermistor
must be secured
tight on stub tube.
428 01 5108 01
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