Key Card Access Feature - McQuay MDS Series Service Manual

7.15 Key Card Access Feature

For indoor PCB (MC200-C or MC201-C) with software version 2.7 and above, it is come equipped with an
additional function called as "Key Card Access Feature". This feature is particularly useful for application such as
hotel room which requires the unit to be in standby and only allow user to operate the air conditioning unit when
the hotel room card is inserted. In order to have this function, you will require the following items:
1. Indoor PCB with version 2.7 and above
2. Junction Box (Part Number: R50044119815)
3. Contactor for Key Card Access
Kindly take note that indoor units produced from March 2012 onwards should comes with PCB version 2.7.
Kindly refer to the table below which indicates the starting batch number of indoor unit production that comes
with PCB version 2.7.
For the Junction Box, it can be purchased separately from spare part department. Alternatively, you may source
for a NC Relay locally in order to replace the usage of Junction Box. For the key card access contactor, it is to be
sourced locally according to specification required.
The diagram below shows the outline and dimension of the Junction Box:
Top View
Service Manual SM-MDS_(ii)
Model Starting Batch
M(5)WMD-G 20551012-XXXXX
M(5)CKD-C 20551107-XXXXX
M(5)CKD-A 20551107-XXXXX
M(5)CMD-E 20551006-XXXXX
M(5)CMD-D 20551206-XXXXX
M(5)CMD-C 20551206-XXXXX
M(5)CCD-C 20551006-XXXXX
Side View
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