McQuay MDS Series User Manual

14 Service Manual SM-MDS_(ii)
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

McQuay MDS Series Specifications

General

Brand	McQuay
Model	MDS Series
Category	Compressor
Language	English