EN - 39
EN - 38
ENGLISH
Oil Level Control Method
Oil Level Control and Oil Addition Assessment Criteria
[ Checking method ]
During continuous operation of the refrigeration unit, check for any variations of the oil control electronic
expansion valve opening by using the digital display.
•
Correct operation
The electronic expansion valve opening generally stays between “small opening” and “medium opening” without
occurring “Oil level anomaly (E391)”.
(E.g.) 1) 120 → 240 → 360 → 240 → 120 . . . . . . Moves up and down in a relatively short time including “large
opening”, but promptly goes down.
2) 90 → 120 → 150 → 120 → 90 . . . . . . . . Maintains a relatively “small opening”.
•
Abnormal motion (Insufficient oil supply)
1) The electronic expansion valve opening stays around the large opening (480 steps).
2) The electronic expansion valve opening frequently reaches the large opening (480 steps).
3) “Oil level anomaly (E391)” occurs. (Stop the compressor)
(3) Adding oil
Add oil when the following condition is confirmed.
1) When the oil level checked by the item “(1) Checking the change of oil level” stays near the lower limit.
2) When the electronic expansion valve opening checked by the item “(2) Check the degree of opening of the
oil control electronic expansion valve” was confirmed to stay at the large opening (480 steps) or near the
upper limit of the “large opening”.
3) “Oil level anomaly (E391)” occurs.
The oil addition assessment shown above is based on the condition that no clogging exists in the oil
control electronic expansion valve (MOV1) or strainer in the Caution refrigerant circuit.
Caution
01_OCU-CR1000VF8A.indd 39
2019/08/27 10:56:09
