Back-Up Operation At Sensor Malfunction - Daikin LXE10E-A Service Manual

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3.4.2 Back-up operation at sensor malfunction

Sensor malfunction
SS Supply air temperature
sensor
RS Return air temperature
sensor
AMBS Ambient temperature sensor All modes Continuous operation
DCHS Discharge gas
temperature sensor
EIS Evaporator inlet
temperature sensor
EOS Evaporator outlet
temperature sensor
SGS Suction gas temperature
sensor
HPT High pressure transducer Chilled
LPT Low pressure transducer
Mode
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 No influence (continuous operation)
Frozen
Defrost
Chilled No influence (continuous operation)
Defrost
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- The same control is executed by using DRS (optional).
ING
Chilled Continuous operation
PF Continuous operation
Frozen
Defrosting
Chilled, PF Continuous operation
Frozen See the next page
Defrosting No influence (continuous operation)
Chilled, PF Continuous operation
Frozen See the next page
Defrosting Defrosting start-up:Always permissible
Defrosting termination:The 90 minute timer count-up or
when EIS>90˚C or RS>set point
Chilled, PF Continuous operation
Frozen See the next page
Defrosting No influence (continuous operation)
Continuous operation
PF, Frozen
Defrosting Refrigerant charge:No influence
Refrigerant release:LPT is used for releasing.
Chilled Continuous operation
PF, Frozen
Defrosting Refrigerant charge:HPT is used for charging
Pump down:Pump down operation is not conducted
3-34
PF : Partial Frozen
Back-up content