McQuay MDS Series User Manual

66 Service Manual SM-MDS_(ii)
L2
Low pressure sensor
broken
 Low pressure sensor connecting wire broken
 Outdoor PCB LS port broken
74
L3
Indoor and outdoor
communication
 Outdoor work normal, but all indoor communication abnormal
76
10
System malfunction
(slave unit)
 Slave unit high pressure malfunction occurred 3 times
 Low pressure malfunction occurred 3 times
 Discharge temperature too high 1 times
 Compressor overload protector jumped for 3 times
80
11
TH1 open/short-circuit
(slave unit discharge)
 Slave unit discharge temperature sensor TH1 broken or loose
73
12
TH2 open/short-circuit
(slave unit 1# inlet coil)
 Slave unit 1# inlet coil temperature sensor TH2 broken or loose
13
TH3 open/short-circuit
(slave unit 1# midlet
coil)
 Slave unit 1# midlet coil temperature sensor TH3 broken or loose
14
TH4 open/short-circuit
(slave unit 2# inlet coil)
 Slave unit 2# inlet coil temperature sensor TH4 broken or loose
15
TH5 open/short-circuit
(slave unit 2# midlet
coil)
 Slave unit 2# midlet coil temperature sensor TH5 broken or loose
18
TH8 open/short-circuit
(slave unit ambient
temperature)
 Slave unit ambient temperature sensor TH8 broken or loose
19
TH9 open/short-circuit
(slave unit total outlet
coil)
 Slave unit outlet coil temperature sensor TH9 broken or loose
1A
TH10 open/short-circuit
(slave unit sub-cooling
outlet)
 Slave unit sub-cooling outlet coil temperature sensor TH10 broken or loose
1B
TH11 open/short-circuit
(slave unit super
cooling suction
temperature)
 Slave unit sub-cooling suction temperature sensor TH11 broken or loose
1C
TH12 open/short-circuit
(slave unit suction
temperature)
 Slave unit suction temperature sensor TH12 broken or loose
1F
Emergency run
 Premise: part indoor communication failure
 Slave unit suction super-heat less than 1ºC for 15 minutes persistently.
 Slave unit TH12 malfunction
87
20
Outdoor storage
malfunction (slave unit)
 Slave unit PCB chip data read failure by outdoor unit when power on
 Slave unit PCB chip broken
82
6

McQuay MDS Series Specifications

General

Brand	McQuay
Model	MDS Series
Category	Compressor
Language	English