6-9
Symptom
Checkpoint
Remedy
Cause
The control
temperature is
unstable
Faulty low pressure
transducer LPT
Faulty contact of
solenoid valve (BSV)
Faulty discharge pipe
temperature sensor DCHS
Faulty opening of
suction modulating
valve SMV
Replace the LPT
Correct installation of DCHS
The SMV opening is
fixed to approx. 79pls (24%)
Operating temperature
is hunting
Is the difference in
pressure between the
pressure gauge and
LPT 30 kPa or more?
Is the DCHS or heat
insulator installed
inappropriately?
Check the BSV
connector or lead wire
Reset the opening of SMV
(Circuit breaker ON)
YES
YES
YES
NO
NO
NO
※
BSV: Discharge gas bypass solenoid valve
Ⅴ
Control is unstable (during chilled proportional control operation)
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