Service manual

14 Service Manual SM-MDS_(i)
3.1 MDS Outdoor Unit PCB
There are two types of PCB for MDS outdoor unit, namely MDOM PCB and MDS-M PCB.
MDOM PCB
Remark:
No No
1
PWM - Pulse Width Modulation
17 NEUTRAL
2
4WV - Four way valve
18 TRAN-H
3
DIG - Digital compressor
19 TRAN-L
4
FIX - Fix compressor
20 Orange Connector (B
pc
A
pc
)
5 HI FAN 21 Green Connector (B
in
A
in
)
6 MI FAN 22 Dipswitch J1
7 LO FAN 23 L-PRESS
8
DLT - Digital compressor discharge sensor
24 H-PRESS
9
OD - Outdoor ambient sensor
25 To LIVE
10
RTN - Return air temperature sensor
26 TO NEUTRAL
11
C_BTM - Compressor bottom sensor
27 PCB VERSION
12
INLET - Inlet coil temperature sensor
28 7 Segment LED Display
13
MIDLET - Midlet coil temperature sensor
29 Dipswitch J2
14
OUTLET - Outlet coil temperature sensor
30 K2 Button
15 MDOM PCB 31 K1 Button
16 LIVE
MDOM PCB is used in all MDS-A series outdoor unit and 5MDS 50/60/70B/BR. The figure
above shows the locations for all dipswitches, buttons, electrical connections and sensor
connections.
3.0 PCB & Wiring
1
2
3
4
5
6
7
8 9 10 11
12
13 14
15
16
17
18
19
20 21
22
23
24
25
26
27
28
29
30 31
3