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3.4.2 Back-up operation at sensor malfunction
Sensor malfunction
Mode
Back-up content
SS
Supply air temperature
sensor
Chilled
The same control is executed by using DSS (optional).
In case of DSS malfunction, [RS–2.0˚C] is used for control.
When DSS and RS are faulty, the unit should be stopped.
PF
Frozen
Defrost
No influence (continuous operation)
RS
Return air temperature
sensor
Chilled
Defrost
No influence (continuous operation)
PF
The same control is executed by using DRS (optional).
In case of DRS malfunction, [SS+2.0˚C] is used for control.
When DRS and SS are faulty, the unit should be stopped.
DEFROST-
ING
The same control is executed by using DRS (optional).
AMBS Ambient temperature sensor All modes Continuous operation
DCHS Discharge gas
temperature sensor
Chilled
Continuous operation
PF
Frozen
Defrosting
Continuous operation
EIS
Evaporator inlet
temperature sensor
Chilled, PF Continuous operation
Defrosting No influence (continuous operation)
EOS
Evaporator outlet
temperature sensor
Chilled, PF Continuous operation
Defrosting Defrosting start-up:Always permissible
Defrosting termination:The 90 minute timer count-up or
when EIS>90˚C or RS>set point
SGS
Suction gas temperature
sensor
Chilled, PF Continuous operation
Defrosting No influence (continuous operation)
HPT
High pressure transducer
Chilled
PF, Frozen
Continuous operation
Defrosting Refrigerant charge:No influence
Refrigerant release:LPT is used for releasing.
LPT
Low pressure transducer
Chilled
PF, Frozen
Continuous operation
Defrosting Refrigerant charge:HPT is used for charging
Pump down:Pump down operation is not conducted
HPS
High pressure switch
All modes Continuous operation
WPS Pressure switch for water
All modes Continuous operation
CTP
Compressor thermal protector All modes Continuous operation
PF : Partial Frozen
Frozen
See the next page
Frozen
See the next page
Frozen
See the next page
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