Haier AW07EH2VHA, Руководство по обслуживанию

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LARGE CASSETTE TECHNICAL OVERVIEW E-3
ENGLISH
Components
The Blower Assembly
The blower assembly c onsists of a plastic bl ower wheel that is connected to a PSC indoor blower motor. A set screw holds
the blower wheel to the blower motor.
The indoor blower mot
or is a Multi Speed Fan M otor that is connected to the indoor unit control board. The wiring from the
motor to indoor board consists of 4 wires connected to pins common, low , medium and high speeds.
During normal oper
ation, the indoor control board will energize the indoor blower motor and request proper speed. The
motor has a run capacitor that is located in the Casse tt e unit’s control box. The run capacitor connects to the motor via
Louver Motors
The louver motors are stepper type motors that move the louvers up/down. The motors are controlled by pulsed voltage
that cannot be measured. If the louver does not move when it should, check for a bind in the louvers.
Piping Temperature Sensor
The Piping Temperature Sensor senses indoor coil temperature in the c ooling mode and in the heating mode. This sensor is
used f or Anti F ree zing and Anti Cold Blow cycles. The sensor also pr ovides critical tempe rature inf ormation to the ECU that
may be used in frequency adjustments.
Ambient Temperature Sensor
The Ambient Temperature Sensor senses room temperature. This sensor provides room temperature inf ormation to the
ECU f or calculation of inverter capaci ty and temperature control.
Control Board
The indoor unit circuit board controls the s witching functions of the indoor unit. All control decisions are made by the
outdoor unit ECU. The indoor boar d has some limited diagnostic capabili ty which will be covered in this manual.
C ondensate Pump & Float Switch
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1. If in COOL or DRY mode: Compressor running (Thermal ON), then condensate pump is energized
•When compressor stops (Thermal OFF), condensate pump runs for an additional 5 minutes
2. If in COOL or DRY modes and compressor is running (Thermal ON) and the float switch opens for 5 minutes
•Compressor will stop, the pump will continue to run
•If the float switch does not close, error code will display and pump continues to run
•If the float switch does close, the pump will continue to run for 5 additional minutes
3. During standby (Thermal OFF) in COOL/DRY modes or in HEAT and FAN modes and float switch opens for 2 seconds,
the condensate pump is energized.
•If the float switch closes, the pump will run an additional 5 minutes
•If the float does not close, the pump continues to run and error code is displayed