Haier AW07LC2VHA, Технический обзор

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TECHNICAL OVERVIEW
PAGE 46
ENGLISH
CASSETTE UNIT TECHNICAL OVERVIEW
Cassette Unit Components
The Blower Assembly
The blower assembly consists of a plastic blower wheel that
is connected to a PSC indoor blower motor. A set screw holds
the blower wheel to the blower motor.
The indoor blower motor is a Multi Speed Fan Motor that is
connected to the indoor unit control board via Plug CN-11.
The wiring from the motor to indoor board consists of 4 wires
connected to pins common, low , medium and high speeds.
During normal operation, 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 Cassette
unit’s control box. The run capacitor connects to the motor via
two orange wires. This capacitor is field replaceable.
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. If the louver is free to
move, refer to the Test Procedure Section.
Blower/Fan
Assembly
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. See Temperature Sensor Functions.
The Ambient Temperature Sensor senses room
temperature. This sensor provides room temperature
information to the ECU for calculation of inverter capacity
and temperature control.
Both sensors are negative temperature coefficient type that
reduce electrical resistance as temperature rises.
C25
C24
Louver motor