Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual
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.8 Precautions for Unit Operation
(1) Before initially starting the unit, ensure that it is powered on for more than 8 hours, in order to prevent
foam phenomenon of refrigerator oil when the unit starts up. If the unit starts up in low temperature, the
oil is very viscous, and the compressor is difficult to start and load. In this case, the oil must be
preheated for more than 8 hours. When the system stops, the refrigerator oil heater continues to work.
Do not cut off the power supply, because the refrigerator oil heater keeps on working after the system
stops. When the unit is not in use for a long time, you can cut off the power supply.
(2) Do not mix refrigerator oil of different brands. Confirm the brand specifications of the refrigerator oil
when adding it. If you want to change the refrigerator oil, clean away all the remaining refrigerator oil
inside the compressor and that in the system before adding new refrigerator oil and changing the
drier-filter. Qualitative change may happen when some synthetic oil mixes up with mineral oil.
Therefore, after adding the new refrigerator oil, change the new refrigerator oil to remove all the
remaining oil after the unit starts up again.
(3) If an accident occurs during compressor startup, you can click the Emergency Stop button on the
touchscreen to stop the compressor.
(4) Without the permission of company 's after-sale personnel, it is prohibited to change parameters of the
electrical expansion valve. Otherwise, the unit may fail to run properly.
(5) If the safety valve of the store liquid organ is open, ensure that the ambient environment of the unit is
well ventilated. When Freon meets fire, harmful phosgene will be generated. Therefore, do not light
open fire around the unit.
WARNING
To prevent personal injury or death due to contact with any
moving or live part, cut off the master power supply before
check or maintenance, and suspend a sign "switch-on
prohibited" near the switch.
