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The Slim Duct Indoor Unit will act as evaporator coils during cooling mode and condenser coils during heating mode. This unit can
operate with a motorized supply air louver or it can have a LIMITED amount of ducting added to the unit's return and supply air
These units have a built in condensate pump with an associated condensate level switch. The condensate pump is capable of
supplied condensate pump with high lift power.
The layout of the system is very straightforward and components are easily accessed should service be required. The blower
assembly and room air temperature sensor is accessed at the rear of the evaporator coil, and the piping temperature sensor
electrical control box.
All operating status and information is displayed on the wired controller. The Slim Duct unit does not have a display.
Component Overview
Slim Duct units are
controlled by a wired
controller only.
1
Evaporator Coil
Blower Assembly
2
The indoor unit features a DC variable speed dual shaft
blower motor that will change speed to match the
capacity demand from the outdoor unit. The motor
is a dual shaft type that powers two individual blower
assemblies.
The blower assembly consists of 2 plastic blowers. A set
screw holds each blower wheel to the blower motor.
The indoor blower motor is connected to the indoor
unit control board. The wiring from the motor to indoor
board consists of 5 wires connected to pins that deliver
line voltage, speed, and feedback information.
During normal operation, the indoor control board will
energize the indoor blower motor and request proper
speed. Fan power should be set using the DIP Switches
SW1 settings.
Control Board
3
Located under the electrical control box cover.
F-2
Components
1
8
4
5
6
SLIM DUCT TECHNICAL OVERVIEW
6
2
Terminal Block
Power to operate the indoor unit comes from the
electrical line voltage terminal block at the outdoor unit.
The wiring includes 4 wires, 1, 2, 3 and ground. Wires 1
and 3 complete the data path. These wires should always
be 14 gauge AWG Stranded type wire. Splices in wires 1
or 3 may cause communication errors.
Ambient Temperature Sensor
The Ambient Temperature Sensor senses room
temperature. This sensor provides room temperature
information to the ECU for calculation of inverter
capacity and temperature control.
Piping Temperature Sensor
The Piping Temperature Sensor senses indoor coil temperature
in the cooling mode and in the heating mode. This sensor is
used for Anti Freezing and Anti Cold Blow cycles. The sensor
also provides critical temperature information to the ECU that
may be used in frequency adjustments.
7
8
3
4
5
- Quick Links:
- Outdoor Units
- Highwall Indoor
- Error Codes
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