5
Final Tubing Check
IMPORTANT
: Check to be certain factory tubing on both indoor
and outdoor unit has not shifted during shipment. Ensure tubes
are not rubbing against each other or any sheet metal. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes
are secure and tight.
Make Electrical Connections
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in 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 for correction
of 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 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.
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
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. 6.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
CONTACTOR
GROUND LUG
FIELD GROUND
WIRING
FIELD POWER
WIRING
A91056
Fig. 6
---
Line Connections
Connect Control Wiring
Route 24v 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, 24v/40va minimum.
NOTE
: Use of available 24v accessories may exceed the minimum
40va power requirement. Determine total transformer loading 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 Guideline--Residential
Split--System Air Conditioners and Heat Pumps.
Install Electrical Accessories
Refer to the individual installation 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.
OAT Thermistor must be locked in
place with spherical nib end facing
towards the front of the control box
A05408
Fig. 7
---
Outdoor Air Thermistor (OAT) Attachment
264A
/265A
