Pcb, Handset And Wiring; Mds Outdoor Unit Pcb - McQuay MDS Series Service Manual

3.0 PCB & Wiring

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
3
Remark:
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.
14
15
16
17
18
19
20
No
1 PWM - Pulse Width Modulation
2 4WV - Four way valve
3 DIG - Digital compressor
4 FIX - Fix compressor
5 HI FAN
6 MI FAN
7 LO FAN
8 DLT - Digital compressor discharge sensor
9 OD - Outdoor ambient sensor
10 RTN - Return air temperature sensor
11 C_BTM - Compressor bottom sensor
12 INLET - Inlet coil temperature sensor
13 MIDLET - Midlet coil temperature sensor
14 OUTLET - Outlet coil temperature sensor
15 MDOM PCB
16 LIVE
1 2 3 4 5
30 31
27
22
21 8 9 10 11
No
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
6 7
29
28
26
25
24
23
12 13 14
NEUTRAL
TRAN-H
TRAN-L
Orange Connector (B
pc
Green Connector (B A
in
Dipswitch J1
L-PRESS
H-PRESS
To LIVE
TO NEUTRAL
PCB VERSION
7 Segment LED Display
Dipswitch J2
K2 Button
K1 Button
Service Manual SM-MDS_(ii)
A )
pc
)
in