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Failure Diagnosis
(2) Other indications
Indication
Alarm (red) LED blinking
Digital display [-CH-]
Failure Diagnosis at the time of Abnormal Discharge Gas Temperature
When the discharge gas temperature goes up abnormally, compressor is stopped for protecting the compression
components of the compressor and discharge gas temperature abnormality alarm is generated at the same time.
In such a case, check the problem position and apply appropriate actions in the sequence shown below.
Checking the refrigeration cycle operation condition
(1) Isn't the refrigerant quantity insuffi cient?
Refer to the "Adjustment of Refrigerant Quantity of Refrigeration Unit" in
the "Adjustment during Operation",
(2) Isn't the suction gas temperature exceeding the limit?
(3) Isn't the low pressure at 0.00MPa or below?
Compressor Operation Status Check
(1) Is the operation sound normal?
(Metallic sound is higher when abnormal)
(2) Is the operation current value normal?
(3) Is the temperature of cooled load no problem?
(4) Is any other abnormal point detected?
Control Component Check
(1) Mounted condition of the discharge gas temperature sensor
Sensor body, connector on the control PCB
(2) Mounted condition of the electronic expansion valve (MOV3)
Coil and connector on the PCB
Meaning
Abnormality existed before.
Up to 50 items of past error
codes are memorized in the
"Alarm History".
Check mode.
EN - 45
Action method
Check the error code
with the table above and
eliminate the cause.
Then, by aligning the
rotary switch knob with
[OPERATION] and pressing
▲ button or turning OFF the
operation switch clears the
LED blinking.
Set the Slide switch SW15
of the CRD1-EN- PCB to
[CONTROL].
Remarks
(To be continued)
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