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Design & installation Guide For McQuay MDS Multi System
Model MDS260BR(Master Unit)
2
HPT
3
3
1
LPT
12
HI-ULOW-U
AinApcBpc
Bin
MDS-M
MDS-P
S3S1 S2
~
M
~
M
M
~
HPT TR
OL3
1.8A
OL4
14.0A
OL1
14.0A
OL2
3.3A
S3.4
ON
S3.2
OFF OFF
S2.3
ON OFF
S3.1 S3.3
ON
S1.1
OFF
S1.2
OFF OFF
S2.2S2.1
FU
EXV14WV
DB3A
PMW
OL
HP
LPT
KM EXV4
Symbol Description Symbol Description
Phase-loss/reverse protector
System electronic expansion valve 1
Fuse
Four-way valve
Contactor
High-pressure switch
Low -pressure sensor
High-pressure sensor Transformer
Overload protector
Solenoid valve
Over cooling electronic expansion valve 4
Overload protection settings :
DIP switch settings :
Description of components and parts :
Constant-speed compressor
Digital compressor Fan motor
Connecting the indoor unit
Connecting central control system
BLACK
WHITE
BROWN
YELLOW
BLUE
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
RED
BLACK
WHITE
RED
BLACK
WHITE
Shaft heater Shaft heater
N
TSR
DB3A
L
T
71
FU
R
N
24 25 26
KM3
OL3
2321 22
19
OL4
KM4
S
81
18
KM1
OL1
T3
T2
T1
T3
T2
T1
OL2
KM2
30
31
32
33
17
5
FIX3-OL
DIG
FIX1
FIX2
TH7 TH5
7
4WV
KM3 KM4
TH1TH2
EXV4EXV1
EXV4
EXV1
TH8TH10 TH9TH11TH12TH6
HI-1
TH3
V1+
TR
V2-
V2+
V1-
DIG-OL
12
13
OL1
OL2
FIX2-OL
FIX1-OL
LOW-I
4WV
FANL
FANH
24
SV2
PMW
11
10
1
SV1
KM4 KM3 KM1
PMW
KM2
3
HP
N
L
OL4
J1
16
15
OL3HP
J18
LP
L1
TH4
BLACK
WHITE
Air suction temperature sensor TH12
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
Ambient temperature sensor TH8
Coil inlet temperature sensor TH2
Air discharge temperature sensor of the digital compressor TH1
Notes:
1:
-----------
Field wiring
2:
--------------
Factory wiring
3: S1.3~S1.8 set the number of indoor units. S2.1 sets the
unit as a master/slave. For details of S2.4~S2.8.
Model MDS280/300BR(Master Unit)
2
HPT
3
3
1
LPT
12
HI-U
LOW-U
AinBinApcBpc
~
M
MDS-M
MDS-P
S3S1 S2
~
M
~
M
M
~
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
RED
BLACK
WHITE
RED
BLACK
WHITE
Connecting the indoor unit
Connecting central control system
33
32
31
30
8
KM2
12
OL2
20
T3
OL3
KM3
T2
T1
17
DB3A
5
FIX3-OL
DIG
FIX1
FIX2
TH7 TH5
7
4WV
KM4
KM5
TH1TH2
EXV4
EXV1
EXV4
EXV1
L
T
71
FU
TH8TH10 TH9TH11TH12TH6
HI-1
TH3
V1+
TR
V2-
V2+
V1-
DIG-OL
13
14
OL1
OL3
FIX2-OL
FIX1-OL
LOW-I
4WV
FANL
FANH
24
SV2
PMW
11
10
1
SV1
KM5 KM4 KM1
PMW
KM3
3
HP
N
L
OL5
J1
16
15
OL4HP
J18
LP
R
N
24 25 26
KM4
OL4
2321 22
19
OL5
KM5
T3T1
T2
L1
S
81
TH4
N
TS
380V/3N~/50Hz
R
18
KM1
OL1
T3
T2
T1
OL2
KM2
HPT
TR
FU
EXV1
4WV
DB3A
PMW
OL
HP
LPT
KM
Description of components and parts :
Symbol Description Symbol Description
Phase-loss/reverse protector
System electronic expansion valve
Fuse
Four-way valve
Contactor
High-pressure switch
Low -pressure sensor
High-pressure sensor
Transformer
Overload protector
Solenoid valve
3.3A 1.8A
OL4 OL5
14.0
OL3OL2
14.014.0
OL1
Overload protection settings :
EXV4
Over cooling electronic expansion valve 4
MDS320BR
MDS300BR
MDS280BR
Model
ON
ON
OFF
ON
ONON OFFOFFOFF
ON OFFOFFOFF
S3.4
OFF
S3.2
OFF
S2.2
ON
ON
ON
ON
ON
ON
ON
S2.3
S3.1
S3.3S1.1
OFF
S1.2
OFF
OFF
OFF
OFF
S2.1
DIP switch settings :
Constant-speed
compressor 1
Constant-speed
compressor 2
Digital compressor Fan motor
Shaft heater
Shaft heater
Shaft heater
BLACK
WHITE
Air suction temperature sensor TH12
Ambient temperature sensor TH8
Air discharge temperature
sensor of the digital compressor TH1
Coil inlet temperature sensor TH2
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLACK
WHITE
BROWN
YELLOW
BLUE
RED
Notes:
1:
-----------
Field wiring
2:
--------------
Factory wiring
3: S1.3~S1.8 set the number of indoor units. S2.1 sets the
unit as a master/slave. For details of S2.4~S2.8.
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