Flooded type water cooled screw chiller (PCB Control) MCAC-CTSM-2012-11
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correct operation of the corresponding circuit.
Oil Charging/Low Oil Recharging
Pre-cautions in changing of oil
1. Use only qualified oil and do not mix different brand of oil together. Different kinds of refrigerant should
match different kinds of oil, note that some synthetic oil is incompatible with mineral oil.
2. When using the synthetic oil for the chiller system, be sure not to expose the oil to atmosphere for a
long time, it is also necessary to vacuum the system completely when installing the compressor.
3. In order to ensure no moisture inside the system, it is suggested to clean the system by charging it
with dry Nitrogen and then vacuum the system repeatedly as long as possible.
4. It is essential to change for new oil especially after the motor burns out; the acidity debris still remain
inside the system so clean work must be done to overhaul the system. Check the oil acidity after 72
hours of operation and then change it again until the oil acidity is in the standard value.
5. Contact local distributor/agent for concerning unqualified oil to be used.
Oil change
1. Change oil periodically: Check the lubrication oil for every 10,000 hours of continuous running. For the
first operation of the compressor, it is recommended to change oil and clean oil filter after running at
2,000 hours. Check the system whether clean or not and then change the oil every 20,000 hours or after
3 years of continuous running while the system is operated under good condition.
2. Avoid the debris or swarf clogging oil filter, this may caused bearings failure. The oil pressure
differential switch will trip when the oil pressure differential reaches the critical point (default: 150kPa).
The compressor will automatically shut down to prevent the bearings from getting damaged due to the
lack of lubricating oil.
Caution
Compressor oil is pressurized. Use proper safety precautions when relieving pressure.
Additional oil charge to lubrication systems
1. If the unit shuts off repeatedly on Low Oil Level, this may be an indication of inadequate oil charge. It
could also mean simply that there may be problems in the process of being reclaimed from the low-side
of the system. Adjust the valves of high pressure side and evaporator side; make sure oil reclaiming
process effective. If problem still persists, additional oil charge is needed.
2. Make sure that the unit is not running when adding oil, as this will make the oil charging process easier.
Because the system is under pressure even when the unit is not running, it will be necessary to use a
suitable pump (hand pump or electric pump) to add oil to the system.
3. Use a suitable pump to add appropriate Synthetic ester compressor oil (absolutely no substitutes are
approved) to the system. Make sure that the oil level safety switch is NOT tripped, and allow the unit to
restart and run normally. Do not exceed maximum oil change.
According to the oil model and charge, please refer to physical data.
Oil Filter Maintenance
Each compressor has its own internal oil filter and each circuit also has an in-line external filter located
under the external oil separator. The internal oil filter pressure drop should be checked and filter
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