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and sub cooling. A routine maintenance program recommended is shown at the end of this chapter while a card
collection of operating data is at the end of this manual. It is suggested to record on a weekly basis all the operating
parameters of the unit. The collection of these data will be very useful to technicians, in case technical assistance is
requested
Compressor Maintenance IMPORTANT!
The analysis of vibration is a great tool for checking the mechanical conditions of the compressor.
It is recommended to check the value of the vibration immediately after starting and periodically on an annual basis.
Compressor Electrical Connections
It is very important that all the compressors are wired correctly for proper rotation. These compressors will not tolerate
reverse rotation. Verify correct rotation/phasing using a rotation meter.
If wired incorrectly the compressor will make excessive noise, will not pump and will draw about half the normal
current. It will also become very hot if allowed to run for an extended period.
NOTICE: Do not “bump” the compressor to check rotation as incorrect rotation could cause compressor motor
failure in as little as 4 to 5 seconds!
Improper rotation of the compressors is indicated by a compressor module trip, noisy operation, no pressure difference
on manifold gauges and low amp draw.
Compressor Replacement
If the chiller suffers a failed compressor, use these steps for replacement:
Each compressor has lifting eyes. Both lifting eyes must be used to lift the failed compressor.
After a mechanical failure of a compressor, it is necessary to change the oil in the remaining compressor and also
replace the liquid line filter drier. After an electrical failure of a compressor, it will also be necessary to change the oil
in the remaining compressor, replace the filters driers and add a suction filter drier with clean-up cores.
Change filters and oil until the oil no longer test acidic.
Make sure that a heater is correctly installed on the compressor. The heater helps prevent dry starts.
Note: Do not alter the refrigerant piping in any way as this can affect compressor lubrication.
Refrigerant System Open Time
Units use POE oil and therefore refrigerant system open time must be kept to a minimum. The following procedure is
recommended:
Leave a new compressor sealed until it is ready to be installed in the unit. Maximum system open time is dependent
upon ambient conditions, but do not exceed one hour open time.
Plug the open refrigerant line to minimize moisture absorption. Always change the liquid line filter drier.
Do not leave POE oil containers open to the atmosphere. Always keep them sealed.
14.2
SAFETY DEVICES
The risks due to the pressure inside the circuit have been eliminated or (when it is not possible) reduced by
means of safety devices. It is important to check periodically the status of this device and to carry out the
components inspections and repositioning as follows.
14.3
SIGHT CHECK OF THE LIQUID RECEIVER
Check the liquid receiver state at least one a year.
It is important to check that the surface does not get rusty and that neither corrosion nor deformations are visible.
In case the superficial oxidation and the corrosion are not properly controlled and stopped in time, cause a thickness
reduction with a consequent reduction of the receiver mechanical resistance.
Use antioxidant paint or products to protect.