McQuay MDS030AR Applications Manual page 47

Model MDS260BR(Master Unit)
R S T
KM1 KM2 KM3
OL1 OL2 OL3
18 19
21 22
T2 T2
T1 T3 T1 T3
M M
~ ~
Shaft heater Shaft heater
Digital compressor
Constant-speed compressor
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
Model MDS280/300BR(Master Unit)
380V/3N~/50Hz
R S T
KM1 KM2 KM3
OL1 OL2 OL3
18 19
T2 T2 T2
T1 T3 T1 T3 T1 T3
M
M M
~
~
~
Shaft heater 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
KM Contactor EXV4 Over cooling electronic expansion valve 4
High-pressure switch
HP PMW Solenoid valve
Low -pressure sensor
LPT OL Overload protector
HPT High-pressure sensor Transformer
TR
L
FU
T 71
S 81
DB3A
R N
KM4
OL4
23 24 25 26
L1
M
~
Fan motor
Description
Overload protection settings :
OL1 OL2 OL3 OL4
14.0A 14.0A 3.3A 1.8A
DIP switch settings :
S1.1 S1.2 S2.1 S2.2 S2.3
OFF OFF ON OFF ON
L
FU
T 71
S DB3A 81
R
N
KM4 KM5
OL4 OL5
20
21 22 23 24 25 26
M
~
Fan motor
Description
Overload protection settings :
OL1 OL2 OL3
14.0 14.0 14.0
DIP switch settings :
Model S1.1
MDS280BR OFF
MDS300BR OFF
MDS320BR OFF
Design & installation Guide For McQuay MDS Multi System
HI-1 TH7 TH6 TH5 TH3 TH12 TH11
LOW-I
TR
V1+
BLACK
V1-
V2+
WHITE
V2-
FIX3-OL
FIX2-OL
OL1 12
FIX1-OL
MDS-P
13
OL2
DIG-OL
LP
S1
HP 15 OL3 16 OL4 17
HP
N
L
J18
J1
1
2 4
KM3 KM4
3 5
PMW KM4 KM3
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.
S3.1 S3.2 S3.3 S3.4
ON OFF OFF OFF
LOW-I HI-1 TH7 TH6 TH5
TR
V1+
BLACK
V1-
V2+
WHITE
V2-
FIX3-OL
OL2 12
FIX2-OL
OL1 13
MDS-P
FIX1-OL
14
OL3
DIG-OL
LP
L1 HP 15 OL4 16 OL5
17
HP
N
L
J18
J1
1 2
KM4
3
PMW
OL4 OL5
3.3A 1.8A
S1.2 S2.1 S2.2 S2.3 S3.1 S3.2 S3.3 S3.4
OFF ON OFF ON ON OFF OFF ON
OFF ON OFF ON ON OFF ON OFF
OFF ON OFF ON ON OFF ON ON
LPT HPT
1 2 3 1 2 3
TH10 TH9 TH8 TH4 TH2 TH1
LOW-U HI-U
MDS-M
30
Connecting the indoor unit
31
32
Connecting central control system
33
S2 S3
EXV1 EXV4
7
10 11
EXV1 EXV4
4WV KM1 KM2
LPT HPT
1 2 1 2
3 3
TH3 TH12 TH11 TH10 TH9 TH8 TH4 TH2 TH1 LOW-U HI-U
MDS-M
30
31 Connecting the indoor unit
32
Connecting central control system
33
S1 S2 S3
EXV1
EXV4
4 7
8 10 11
KM5 EXV1 EXV4
5
KM5 KM4 4WV KM2 KM1 KM3
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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