Electronic Controls - Haier GE 2U18MS2HDA Service Manual

Electronic Controls

The outdoor unit features a variable speed, rotary type compressor that delivers refrigerant
flow to up to 4 individual indoor units. The system uses R-410A refrigerant mixed with PVE
oil, and is 208/230 VAC, 60 Hz, single phase.
Compatible indoor units are High wall, Cassette, and Ducted with remote control, cassette
with either remote or wired control, and ducted with wired control only.
The indoor units will maintain individualized room temperatures as set on each controller,
provided all units are in the same mode. If the first unit to be turned on is set to the heating
mode, all units will heat. If the first unit to be turned on is set to the cooling mode, all units will
cool.
The SMB has important features including operational DIP switches, error code display, compressor speed, and diagnostic
capabilities.
The SMB is connected to the PCB via connections CN-2 and CN-3.
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The SW1 DIP switches are OFF (default position for normal operation).
The digital display will indicate operating frequency of the compressor when no
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error code is present, or will flash an error code if present.
A solid green LED indicates that the A, B, C, D or E unit is successfully
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communicating with the outdoor unit.
The Inverter Power Module generates 3-phase VAC
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power to operate the variable speed compressor. The
compressor is connected to the IPM via terminals U, V
and W.
A Reactor Coil is connected to the IPM at terminals
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RI and RO. The Reactor Coil will filter electrical noise
generated at high frequency operation that could
cause damage to the compressor windings.
IPM generates a large amount of heat during operation.
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This heat is transfered to a heat sink behind the board,
then mixed with the outdoor air. The Tm temperature
sensor protects the IPM from excessive temperatures.
PAGE 4
Outdoor Unit Introduction
Service Monitor Board (SMB) Overview
Inverter Power Module (IPM) Overview
ELECTRONIC CONTROLS
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