McQuay MDS 100B User Manual

72 Service Manual SM-MDS_(ii)
ER63
Slave outdoor unit
communication failure
 Master and slave communication wire broken
 Master and slave communication wire loose
 Master and slave communication wire A B reversed
 Slave unit power not on
 Master and slave jump wire not correct, still on update status
 Last outdoor unit terminal resistance of communication wire not short-circuit
 Master and slave PCB program not compatible.
 Master and slave PCB abnormal
79
ER64
TH1 temperature
sensor failure
 Outdoor discharge temperature sensor TH1 broken or loose
73
ER65
TH2 temperature
sensor failure
 Outdoor 1# condenser inlet coil temperature sensor TH2 broken or loose
ER66
TH3 temperature
sensor failure
 Outdoor 1# condenser midlet coil temperature sensor TH3 broken or loose
ER67
TH4 temperature
sensor failure
 Outdoor 2# condenser inlet coil temperature sensor TH4 broken or loose
ER68
TH5 temperature
sensor failure
 Outdoor 2# condenser midlet coil temperature sensor TH5 broken or loose
ER71
TH8 temperature
sensor failure
 Outdoor ambient temperature sensor TH8 broken or loose
ER72
TH9 temperature
sensor failure
 Outdoor outlet coil temperature sensor TH9 broken or loose
ER73
TH10 temperature
sensor failure
 Outdoor sub-cool outlet temperature sensor TH10 broken or loose
ER74
TH11 temperature
sensor failure
 Outdoor sub-cool suction temperature sensor TH11 broken or loose
ER75
TH12 temperature
sensor failure
 Outdoor suction temperature sensor TH12 broken or loose
ER76
High pressure sensor
failure
 High pressure sensor communication wire broken
 Outdoor PCB HS port broken
74
ER77
Low pressure sensor
failure
 Low pressure sensor connecting wire broken
 Outdoor PCB LS port broken
EC78
All indoor units
communication failure
 Indoor and outdoor communication wire broken
 Indoor and outdoor communication wire loose
 Indoor and outdoor communication wire A and B reversed
 Communication wire too long, should less than 1000m
 Outdoor PCB not power on
 Indoor and outdoor jump wire not correct, still on update status
 Last indoor unit terminal resistance of communication wire not short-circuit
 Indoor and outdoor PCB program not compatible
 Indoor and outdoor PCB abnormal
76
6

McQuay MDS 100B Specifications

General

Brand	McQuay
Model	MDS 100B
Category	Compressor
Language	English