Controls And Components; High Volt Electrical Wiring - A & T International 1 Service Manual

Installation Considerations
• Determine best location for mounting unit for room air
circulation.
• Determine how power wire (high and low voltage)
condensate drainage, and water supply piping may be
run to and from unit. Knockouts on air handler may be
used for this purpose.
• Consider serviceability when locating unit. Cabinet
service panels must be able to be removed without
obstruction.
• CCP - units can be equipped with hot water coil.

Controls And Components

Supplied
Unit mount control panel includes:
• ¾" backlit LCD display
• Adjustable operational range from 55° F to 95° F (in one-
degree increments)
• 60 second fan purge
• Freeze protection
• Audio feedback on control setting changes
Fan operation: Auto (cycling), High and Low (constant)
• Dry Mode (operates cooling and electric heat simultaneously
to remove humidity when optional electric heat is selected)
• Test Operation for ease of testing after installation (all
timers reduced)
• Non-volatile Backup Memory (control settings maintained
indefinitely during power outages)
• 24V Low Voltage Transformer
IMPORTANT: Unit mounted controls are fully functional
without the hand-held remote. See page 5
Optional Controls & Components
• Infrared hand held remote control
• Condensate pump (field or factory installed)
• Chilled water control valve (field installed)
• Wiring for normally closed/power open valve (24V
AC, 20VA max. or 8VA max. on units with condensate
pumps)
• Open wire electric heaters in 3 sizes (factory
installed ONLY) with automatic reset high
temperature cutout and redundant high temperature
fuse link
• Hydronic heat coil with sweat connections (consult
factory) CCP only
• 24VAC wall thermostat compatibility
GENERAL PRODUCT INFORMATION
Factory Installed Or

High Volt Electrical Wiring

(SEE THE APPROPRIATE AIR HANDLER SECTION FOR SPECIFIC
WIRING INFORMATION.)
All wiring shall be in accordance with the National Electric Code
(NEC) and local building codes.
1.
Inspect existing wiring for any deficiencies such as cut
or frayed wires. Replace such wiring if found.
2.
Check unit rating plate for circuit ampacity and breaker
or fuse size. Use only HACR type breakers. Select
proper wire for ampacity rating.
3.
Each unit must have separate branch circuit protected
by fuse or breaker. Refer to unit rating plate for proper
wire and breaker or fuse size.
4.
Connect power wire to Black (L1) and other wire to
Red/White (L2) at power connector location. Connect
ground wire to ground lug or lead at same location in
control box.
On units rated 208/230V, primary side of transformer is
factory wired for 230V. For 208V power supply, transformer
tap must be changed from orange to red. Refer to wiring
diagram located on unit.
IMPORTANT: When wiring WCP 18–30 only: If job site
voltage is 208V, WCP high-low fan speed switch may be
rewired to increase air speed. Replace black and red fan
motor wire connections with blue and orange fan motor
wires respectively. See unit wire diagram for specific
details.
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