McQuay MDS 100B

16 Service Manual SM-MDS_(ii)
3.2 MDS Indoor Unit PCB
There are two types of PCB for MDS indoor unit, namely MC200-C and MC201-C.
MC200-C
Remark:
No
No
1
NEUTRAL
10
Fan Motor - HI FAN, MI FAN, LO FAN
2
LIVE
11
T_IN - Inlet coil temperature
3
Dipswitch 1 (SW1)
T_MID - Midlet coil temperature
4
Dipswitch 4 (SW4)
T_OUT - Outlet coil temperature
5
Dipswitch 2 (SW2)
12
A
pc
& B
pc
(Centralize Control)
6
Dipswitch 3 (SW3)
13
A
in
& B
in
(Outdoor Communication)
7
PCB Software Version
14
T_Room - Room temperature
8
MC200-C
15
Display Board & IR Receiver
9
Swing
MC200-C PCB is only used by M(5)WMD 20/25G indoor unit. This PCB can be easily recognized by
identifying the chamfered edge on the top right corner. The figure above shows the locations for all
dipswitches, buttons, electrical connections and sensor connections.
1
2
3
4
8
7
5
6
11
9
10
15
14
13
12
3