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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.
In case of DSS malfunction, [RS–2.0˚C] is used for control.
When DSS and RS are faulty, the unit should be stopped.
Frozen
Defrost
Error indication only (Operation continued)
RS
Return air temperature
sensor
Chilled
Defrost
Error indication only (Operation continued)
DEFROST-
ING
The same control is executed by using DRS.
AMBS Ambient temperature sensor All modes Error indication only (Operation continued)
DCHS Discharge gas
temperature sensor
Chilled
Error indication only (Operation continued)
Frozen
Defrosting
Error indication only (Operation continued)
EIS
Evaporator inlet
temperature sensor
Chilled
Error indication only (Operation continued)
Defrosting Error indication only (Operation continued)
EOS
Evaporator outlet
temperature sensor
Chilled
Error indication only (Operation continued)
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
Error indication only (Operation continued)
Defrosting Error indication only (Operation continued)
HPT
High pressure transducer Chilled
Frozen
Error indication only (Operation continued)
Defrosting Refrigerant charge:Error indication only (Operation continued)
Refrigerant release:LPT is used for releasing.
LPT
Low pressure transducer
Chilled
Frozen
Error indication only (Operation continued)
Defrosting Refrigerant charge:HPT is used for charging
Pump down:Pump down operation is not conducted
(Operation continued)
Frozen
See the next page
Frozen
See the next page
Frozen
See the next page
03̲LXE10E100以降(27-32)̲E.qx 08.8.22 10:28 AM ページ 3-28
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