Haier AW07LC2VHA, Технический обзор

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TECHNICAL OVERVIEW
PAGE 34
ENGLISH
INDOOR UNIT TECHNICAL OVERVIEW
Indoor Wall Mount Unit Components
Indoor Unit Technical Overview
The wall mounted units act as evaporator coils during cooling
mode and condenser coils during heating mode. These units
have gravity condensate drain systems. If a condensate pump
is needed, it must be field provided and mounted external to
the indoor unit.
The wall mount unit is shipped with a wireless
controller.
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.
The indoor unit features a multi-speed blower motor
that will change speed to match the capacity demand from
the outdoor unit. Separate motors located in the indoor
unit control the operation of the motorized louvers. All of the
louver motors are controlled via commands received from the
remote control. The blower motor is controlled by both the
remote control and by commands from the outdoor unit ECU.
Refer to the Remote Control Information in the Reference
section for louver control/remote procedures.
Unlike typical air handlers found in the US market, these
units have metering devices located in the outdoor unit. The
metering devices are EEV type that are controlled by the
outdoor unit ECU.
Temperature sensors located within the wall mount
unit include a pipe temperature sensor and a return air
temperature sensor. The pipe temperature sensor is used
to sense the temperature of the indoor coil in both cooling
and heating modes. The return air sensor senses the
temperature of the air being drawn into the wall mounted unit
from the conditioned space. The operating functions of these
sensors is explained in the Temperature Sensor Function
section of this manual.
The indoor unit has a display that communicates system
mode, room temperature and diagnostic code information.
The diagnostic code information shown on the indoor unit will
NOT be the same code that is displayed on the outdoor unit.
When servicing a diagnostic error, compare the indoor unit
code to the outdoor unit code to make diagnostic decisions.
Codes that relate to outdoor unit problems should use the
outdoor unit display information as priority.
The indoor unit circuit board controls the switching
functions of the indoor unit. All control decisions are made
by the outdoor unit ECU. The indoor board has some limited
diagnostic capability which will be covered in this manual.
2
3
1
4
6
5
7
Return Air
Temperature Sensor
Display
Terminal
Block
Horizontal Louver
Stepper Motor
Pipe
Sensor
Control
Board
Vertical Louvers
Stepper Motor
Evaporator
Coil
Fan
Motor
7
1
2
3
4
5
6
3
1
2
3
4
5
6
7