Outdoor Unit Technical Overview - Haier AW07LC2VHA Technical Overview

Outdoor Unit Technical Overview

Outdoor Unit Technical Overview
The outdoor unit features a variable speed rotary type com-
pressor that delivers refrigerant flow to up to 4 individual
indoor units. The system uses R-410A refrigerant mixed with
PVE oil. The system is rated to operate at 208/230 volts single
phase 60 Hz power.
Indoor units compatible with this model include high wall type,
slim duct type and cassette type.
The indoor cassette unit can be controlled by either a remote
control or a wired controller. The indoor high wall unit is con-
trolled by infrared remote. The slim duct unit is controlled by
wired controller only.
All indoor units must operate together in either heat mode,
or cool mode. The indoor units will not automatically switch
between heat and cool modes of operation. The first unit that
is turned on and set to provide comfort, will set the operating
mode of the system. All other indoor units must now operate
in the same mode as the first unit that was energized.
The Circuit Boards
There are 4 control boards located in the outdoor unit. To access the boards, remove the top cover and the cover located to the
right of the outdoor fan motor opening. The boards are the Electronic Control Unit (ECU), Module Circuit Board (MCB), Power
Circuit Board (PCU) and Service Monitor Board (SMB).
Service Monitor Board (SMB)
The SMB has important features, including DIP Switches
that affect system operation, Digital Error Code Dis-
plays, Compressor Operating Frequency Display and
Diagnostic capability.
1
The SMB is connected to the ECU via Plugs CN-2
and CN-3.
2
The SMB DIP switch SW-1 should have all 4
switches in the OFF position. This setting will configure
the system for normal operation with variable speed
inverter control.
3
The digital display will indicate operating frequency of the compressor when no error code is present. If a system error
code occurs, the code will be displayed here.
4
There are 4 GREEN LED indicators that indicate the status of the wiring and communication links between the outdoor
unit and indoor unit. When lit GREEN, the wiring is correct.
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Introduction - Overview
Circuit Boards
Service Monitor Board (SMB)
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TECHNICAL OVERVIEW
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