McQuay MDS030A, Руководство по обслуживанию

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Service Manual SM-MDS_(ii) 65
FE
Master unit and slave
unit communication
malfunction

Master unit and slave unit communication wire reversed

Master unit and slave unit communication wire broken or loose

Slave unit toggle switch set wrongly

Master and slave unit PCB version conflict / different
79
H0
Digital compressor
overloaded

Digital compressor operating current too high, overload protector OL4 on
77
H1
Fixed compressor 1
overloaded

Fixed compressor 1 operating current too high, overload protector OL1 on
H2
Fixed compressor 2
overloaded

Fixed compressor 2 operating current too high, overload protector OL2 on
H3
Fixed compressor 3
overloaded

Fixed compressor 3 operating current too high, overload protector OL3 on
H4
High pressure too high

Outdoor motor broken (cooling)

Outdoor circulating air short-circuit (cooling)

Outdoor heat exchanger too dirty (cooling)

Outdoor ball valve not open

Indoor circulating air short-circuit (heating)

Indoor heat exchanger too dirty (heating)

Indoor unit filter blocked by dirt (heating)

Indoor EXV not on properly (heating)

Refrigerant over charged

Outdoor PCB high pressure output port abnormal

Pressure sensor broken

Pressure switch broken
78
H5
High pressure sensor
malfunction

High pressure sensor communication wire broken

Outdoor PCB HS port broken
74
H6
Discharge temperature
too high (TH1)

Outdoor motor broken (cooling)

Outdoor circulation air short-circuit (cooling)

Outdoor heat exchanger too dirty (cooling)

Outdoor EXV not on properly (heating)

Indoor EXV not on properly (heating)

Refrigerant leakage or insufficient

Outdoor ball valve not open
78
L0
Super heat protecting
value too small

Indoor motor not work when cooling

Indoor EXV opening degree abnormal when cooling

Outdoor motor not work when heating

Outdoor EXV opening degree abnormal when heating

Low pressure sensor abnormal

Refrigerant over charged
86
L1
Low pressure too low

Outdoor ball valve not open

Outdoor heat exchanger efficiency too low when heating

Outdoor motor run abnormally when heating

Refrigerant leakage or insufficient

Outdoor PCB low pressure output port abnormal

Low pressure sensor broken
78
6