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Control Functions
Protective Functions
(1) High pressure abnormal, over current
Stops the compressor.
(2) Discharge gas temperature abnormal
1. Normal operation
Compressor operation stops when the discharge gas temperature exceeds 118 °C, and resumes when the
discharge gas temperature becomes 75 °C.
2. When abnormal discharge gas temperature occurs 3 times in 2 hours.
Compressor is made to stop even the discharge gas temperature becomes 75 °C.
For the method of resuming (resetting) compressor operation, refer to the "Explanation of Abnormality Alarm" in
"About Alarms"
(3) Refrigerant fl ood back alarm
When the difference (suction gas superheat) between the suction gas temperature sensor value and evaporating
temperature converted from the low pressure becomes 1 K or below for continuously 2 minutes, an error signal is
indicated. During such condition, compressor operation continues.
Error indication is canceled when the suction gas superheat exceeds 5 K.
(4) Sensor abnormality
1. Open condition of low pressure, intermediate pressure sensor, high pressure sensor
Compressor stops with an error indication.
For the method of resuming (resetting) compressor operation, refer to the "Explanation of Abnormality Alarm" in
"About Alarms"
2. Open condition of discharge gas temperature sensor, gas cooler outlet temperature sensor, split cycle outlet
temperature sensor, unit outlet temperature sensor, and ambient temperature sensor
Compressor stops with an error indication.
For the method of resuming (resetting) compressor operation, refer to the "Explanation of Abnormality Alarm" in
"About Alarms"
3. Open condition of suction gas temperature sensor
Error is indicated but the compressor continues operation.
Error is canceled when the sensor returns to normal, but the alarm (Red) LED maintains blinking condition.
(5) Communication abnormality
While communication continues with the controller (external communication refrigerator No. is other than 0 ),
if the controller data is not received for 10 minutes, then error is indicated. During such condition, compressor
operation continues.
Error is canceled when data reception from the controller is resumed.
When the external communication refrigerator No. is set to other than 0 without connecting the
Caution
controller, an error is displayed. Use caution.
EN - 35
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