Operating manual - ChillPAC and LP ChillPAC Mk 3
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010823 en 2021.06
4.3
Noise and vibrations
4.3.1
General information
To ensure the compressor and motor a long life and a low noise and vibration level, it is recommended
to check alignment of the chiller unit.
Misalignment may result in stresses and vibrations which can be transmitted to the compressor and mo-
tor 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.
4.3.3
Foundation
To obtain the desired vibration damping, the concrete foundation must have the necessary bearing
strength and be as plane as possible. Always collect weight information of the chiller unit before projec-
ting the concrete foundation.
4.3.4
Vibration dampers
The compressor unit on a ChillPAC and an LP ChillPAC is placed on vibration dampers and thus isolated
from the rest of the chiller unit. These dampers are adjusted to the compressor and motor weight and
designed for minimum 70% vertical isolation (100% capacity), which will be sufficient for chiller units in-
stalled on solid concrete floors.
ChillPAC and LP ChillPAC units must be level, and it is therefore recommended to install the unit on ma-
chine feet. The load on the machine feet must be distributed evenly so the deflection will be roughly the
same on each of the feet, see Fig. 20.
Deflection of a machine foot can be adjusted by increasing or reducing the load compared to the other
supports by turning the adjusting rod.
For installation in storey buildings, specially designed vibration dampers are often required. In such
cases, it is recommended to replace the machine feet with specially designed vibration dampers.
Contact a vibration expert or a Johnson Controls Denmark representative for more information.
Fig. 20: Machine foot
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