507043-03
Page 5 of 9
Issue 1337
ELECTRICAL SHOCK HAZARD!
WARNING
Electrical Connections
Turn OFF electric power before connecting unit,
performing any maintenance or removing panels or
doors. More than one disconnect may be required to
turn off all power.
FAILURE TO DO SO COULD RESULT IN BODILY
INJURY OR DEATH.
Be sure to check all local codes to determine that the
unit is installed in accordance with local requirements.
Consult the National Electric Code for wire size require-
ments. Use 60° C or higher copper wires only. Always
provide ground connections to the outdoor unit. Power
supply must agree with the rating on the unit nameplate.
Provide line voltage power supply to unit from a
properly sized disconnect switch. Route power and
ground wires from disconnect switch to unit. Line voltage
connections are made at the line side of the contactor
in the control box of the outdoor unit. Follow the wiring
diagram attached to inside of the access panel.
Proper circuit protection recommendations are
indicated on Unit Rating Plate. Time delay fuses are
required to prevent blowing due to starting current (the
current in rush when equipment starts is reffered to as the
Locked Rotor Amps or LRA) .
Remove access panel to gain access to unit wiring.
Extend wires from disconnect through power wiring hole
provided and into unit control box. Flexible conduit is
required for the swing out control box feature.
WARNING
The unit cabinet must have an uninterrupted or
unbroken ground. The ground must be installed in
accordance with all electrical codes. Failure to follow
this warning can result in an injury, fire, or death.
Connect ground wire to ground connection in control
box for safety. Connect power wiring to contactor.
High voltage power connections to 3-phase models is
made to “Pig Tail” leads with field supplied splice
connectors.
Contol Wiring
The control voltage is 24 VAC. NEC Class I insulated
18 AWG is required for control wiring. For lengths longer
than 150 feet, contact your local distributor for technical
service.
Ensure the room thermostat is properly installed per
instructions shipped with room thermostat. Generally the
thermostat should not be exposed to sunlight, drafts or
vibration and should not be mounted on exterior walls.
WARNING
Low voltage wiring must be separated from high voltage
wiring.
Low voltage connections should be in accordance to
the wiring diagram.
Start-Up Procedure
1. Close electrical disconnects to energize system.
2. Set room thermostat at desired temperature. Be sure
set point is below indoor ambient temperature.
3. Set the system switch of the thermostat on COOL
and fan switch for continuous operation (ON) or
AUTO, as desired.
4. Adjust refrigerant charge per “Adjusting Charge”
section.
Adjusting Charge
Factory charge is shown on the rating label located on
the access panel.
All units are factory charged for 15 feet of con-
necting line set.
Charge should be adjusted for line set
lengths other than 15 feet. For line sets shorter than 15
feet in length, remove charge. For line sets longer than
15 feet, add charge. Oil charge is suffficent for all line
lengths.
Before final adjustment is made to the refrigerant
charge, check for proper indoor airflow. Recommended
airflow is
350-450 CFM per ton
(12,000 Btuh) through a
wet coil
. Refer to indoor unit instructions for methods of
determining air flow and blower performance.
Typical Low Voltage Connection
Refrigeration Charge Adjustment
Liquid Line Diameter
Oz. Per Linear Foot
3/8”
.6