12-6
CONTROL SYSTEM
Revision Y05-01
Service Manual - WMZ
12.4.6.2
Handling the thermistor faults in a COMP unit
i.
ICT/OCT thermistor is disconnected or shorted -
The invalid thermistor temperature is replaced by 43
o
c, so that the unit
can continue the normal operation. All protections related to that faulty
thermistor will be disabled. For example, in case of any ICT fault, the ICT
high pressure protection in Heat Mode and ICT defrost protection in Cool
Mode will not operate anymore. The same is also applied to the OCT fault.
ii.
RAT thermistor is disconnected or shorted –
The RAT will be derived from the ICT by using the equations :
Heat
Mode:
RAT=ICT/2.3
Cool
Mode
RAT=ICT*4
Notes:
•
In case of any thermistor failure, the STBY LED will be blinking until the
fault condition is corrected.
•
User can use the system diagnostics function to find out the nature of
the thermistor faults.
i.
RAT thermistor is disconnected or shorted –
System will operate continuously in the last IFAN & WVL status when
turned ON.
Notes:
•
As in the COMP unit, the STBY LED will be blinking to indicate a
thermistor fault. And, the user can use the system diagnostics function
to find out the nature of the fault.
Summary of Contents for WMZ Series
Page 19: ...4 2 OUTLINE DIMENSIONS Revision Y05 01 Service Manual WMZ 4 3 GCZ 7 9 12 4 4 GCZ 17...
Page 20: ...4 3 OUTLINE DIMENSIONS Revision Y05 01 Service Manual WMZ 4 5 GCZ 22...
Page 147: ...15 2 OPTIONAL ACCESSORIES Revision Y05 01 Service Manual WMZ...
Page 148: ...15 3 OPTIONAL ACCESSORIES Revision Y05 01 Service Manual WMZ...
Page 149: ...15 4 OPTIONAL ACCESSORIES Revision Y05 01 Service Manual WMZ...
Page 150: ...15 5 OPTIONAL ACCESSORIES Revision Y05 01 Service Manual WMZ...
