Operating manual - ComPAC
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011769 en 2020.03
Installation information
9. Evacuate the unit.
10. Charge oil if not charged from factory.*
11. Charge refrigerant.
The P&I diagram states the charge for each specific chiller. Start out by charging 75% of
the specified R717 charge. The quality of the refrigerant must be appropriate for refriger-
ation applications; for details: see TI 2015–01 Ammonia quality.
12. Turn on power.
13. Check the Unisab III control system settings including calibration according to the Unisab
III manual.
14. Check the direction of rotation of the compressor motor.
15. Check alignment of the coupling.
All ComPACs are equipped with flange motors, therefore alignment will normally not be
necessary.
16. Carry out the pre-start check, see subsection 5.2.1, and run the compressor in 100%
capacity.
17. Check the liquid level in the evaporator. Droplets should come out of the top of the plates.
The plates should not be completely covered by liquid. Check that the suction superheat
is between 0.5 and 3°K. If higher, carefully charge more R717.
18. Check the R717 liquid level again.
Note: The liquid level must never be visible in the inspection glass.
Note: * ComPAC units may only be charged with PAO oils.
4.3 Noise and vibration
4.3.1 General information
To ensure the compressor and motor a long life and a low noise and vibration level, it is recom-
mended to check alignment of the chiller unit.
Misalignment may result in stresses and vibrations which can be transmitted to the compressor
and motor bearings and cause major damage.
Vibrations may be caused by the following:
• Distortion between the chiller unit and its foundation
• Distortion between the compressor and base frame
• Distortion between the motor and base frame
• Incorrect alignment of the coupling between the compressor and motor
• Tension from the piping connections between the chiller and plant
• Imbalance in the compressor and motor
• Resonance in the unit and coupling
4.3.2 Sound and noise data
Consult the compressor manual for sound and noise data.
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