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McQuay MDS 100B

McQuay MDS 100B
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Service Manual SM-MDS_(ii) 157
7.16 Error Code for Phase Protector
MDS unit is equipped with Scroll Compressor which can only rotate in one direction. For this reason, a protective
device (phase protector) is fitted to prevent incorrect wiring of the electrical phases. When the three phases are
not connected correctly, the phase protector operates, and the unit will not start. This device is located in the
control box of the outdoor unit.
The following table shows the LED indicator light for phase protector under normal and fault conditions.
Description
LED
Actions
PW
(Red)
P_R
(Yellow)
P_S
(Yellow)
P_T
(Yellow)
Normal Operation
ON
OFF
OFF
OFF
-
Reverse Phase
BLINK
BLINK
BLINK
BLINK
Switch off the unit.
Check the 3 phase wiring.
T Phase Missing
BLINK
OFF
OFF
BLINK
S Phase Missing
BLINK
OFF
BLINK
OFF
R Phase Missing
BLINK
BLINK
OFF
OFF
Remark: All error can only recover through manually reset.
7

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