McQuay MDS030AR Applications Manual page 44

Design & installation Guide For McQuay MDS Multi System
-44-
Model MDS150B
380V/3N~/50Hz
R S T
KM1 KM2 KM3 KM4
OL1 OL2 OL3 OL4
T2
T2 T2
T3 T3 T1 T3
T1 T1
M M
M
~ ~
~
Constant-speed Constant-speed Digital compressor
compressor 1 compressor 2
Description of components and parts :
Symbol Description Symbol
DB3A Phase-loss/reverse protector FU Fuse
KM Contactor EXV4 Over cooling electronic expansion valve 4
HP High-pressure switch PMW Solenoid valve
LPT Low -pressure sensor OL Overload protector
HPT High-pressure sensor
TR Transformer
Model MDS150BR
380V/3N~/50Hz
R S T
KM1 KM2 KM3
OL1 OL2 OL3
18 19
T2 T2
T2
T3 T1
T1 T3 T1 T3
M
M
M
~ ~
~
Shaft heater Shaft heater
Constant-speed Constant-speed Digital compressor
compressor 1 compressor 2
Description of components and parts :
Symbol Description Symbol
DB3A Phase-loss/reverse protector FU Fuse
4WV Four-way valve EXV1 System electronic expansion valve 1
KM Contactor EXV4 Over cooling electronic expansion valve 4
HP High-pressure switch PMW Solenoid valve
LPT Low -pressure sensor OL Overload protector
HPT High-pressure sensor TR Transformer
L
FU
T 71
S
DB3A 81
R
N
KM5
OL5
21 22 23 24 25 26
L1
M
~
Fan motor
Description
Overload protection settings :
OL1 OL2 OL3 OL4
14.0 14.0 14.0 3.3A 1.8A
DIP switch settings :
S1.1 S1.2 S2.2 S2.3
OFF ON OFF ON
L
FU
T
71
S 81
R N
DB3A
KM4 KM5
OL4 OL5
20
21 22 23 24 25 26
M
~
Shaft heater
Fan motor
Description
Overload protection settings :
OL1 OL2 OL3 OL4 OL5
14.0 14.0 14.0 3.3A 1.8A
DIP switch settings :
S1.1 S1.2 S2.2 S2.3 S3.1 S3.2
OFF OFF OFF ON OFF OFF
TR LOW-I HI-1 TH7 TH6 TH5 TH3 TH12
V1+
BLACK
V1-
V2+
MDS-M
WHITE
V2-
FIX3-OL
12
OL2
FIX2-OL
OL1 13
MDS-P
FIX1-OL
14
OL3
DIG-OL
LP
S1
16 OL5
HP 15 OL4 17
HP
N
L
J18
J1
1
2 4
KM4 KM5
3 5
PMW KM5
Notes:
OL5
1: -----------Field wiring
2: --------------
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.
S3.1 S3.2 S3.3 S3.4
OFF OFF ON ON
LOW-I HI-1 TH7 TH5
TR
TH6 TH3
V1+
BLACK
V1-
V2+
WHITE
V2-
FIX3-OL
OL2 12
FIX2-OL
13
OL1
MDS-P
FIX1-OL
14
OL3
DIG-OL
LP
HP OL4 OL5
16 17
L1 15
HP
N
L
J18
J1
1
2
KM4 KM5
3
KM5
PMW
Notes:
1: -----------Field wiring
Factory wiring
2: --------------
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.
S3.3 S3.4
ON ON
LPT HPT
1 2 3 1 2 3
TH11 TH10TH9 TH8 TH4 TH2 TH1 LOW-U HI-U
30
31 Connecting the indoor unit
32
Connecting central control system
33
S2 S3
EXV1
EXV4
8 10 11
EXV4
KM4 KM2 KM1 KM3
Factory wiring
LPT HPT
1 2 3 1 2 3
TH12 TH10 TH8 TH2
LOW-U HI-U
TH11 TH9 TH4 TH1
MDS-M
30
Connecting the indoor unit
31
32
Connecting central control system
33
S1 S2 S3
EXV1 EXV4
4 7 8 10 11
EXV1 EXV4
5
KM4 4WV KM2 KM1 KM3