Multi-Zone Technical Overview

TECHNICAL OVERVIEW
PAGE 15
ENGLISH
Technical - OverviewOUTDOOR UNIT TECHNICAL OVERVIEW
Module Circuit Board (MCB)
1
The Module Circuit Board generates 3 phase DC power
to operate the variable speed compressor. The compressor is
connected to the MCB via terminals CN-5. CN-6 and CN-7.
2
A Reactor Coil is connected to the MCB at terminals
CN-3 and CN-4. The Reactor Coil will lter out electrical noise
generated at high frequency operation. The ltering out of
electrical noise will prevent pin holes from being burned into
the compressor motor windings during high speed operation.
3
The MCB has 3 surface mounted LED indicators to aid
in diagnostics. The indicator LED colors are GREEN for Power/
Status, Red and Yellow for Diagnostic Codes.
4
The MCB generates heat that is transferred to a heat
sink located on the back of the board. The heat sink trans-
mits this heat to the outdoor air. A temperature sensor Tm is
attached to the inverter semi-conductor chip.
5
The temperature sensor is connected to the MCB via
terminal CN-11. If excessive heat is detected by this sensor,
the system will stop operation and generate an Error Code 38.
The RED Diagnostic LED indicator located on MCB will ash 14
times. When the sensor cools o, the system will re-start and
the diagnostic error codes will clear.
6
There is a communication cable connected to the MCV
via Plug CN-9. The wire from this plug goes to a connection on
the ECU board. If this plug is disconnected or loose, the RED
Diagnostic LED located on the MCB will ash 14 times and the
system will shut o on an Error Code 04.
Module Circuit Board (MCB)
1
2
3
4
5
6
Temperature Sensor
(located under board)
LEDs