Airedale DeltaChill FreeCool 110kW - 1080kW - Manual (Page 19)

Chillers DeltaChill™ Air Cooled and FreeCool
19 Chiller Technical Manual 7267818 V1.4.0_04_2014
Introduction
Phase Rotation Protection
A phase sequence relay shall be fitted for units containing 3 phase scroll compressors, to prevent possible damage by
running the compressor in the wrong direction.
Automatic Power Factor Correction Feature
The automatic power factor correction shall be fitted to the
Chillers electrical distribution system. This feature will provide
automatic regulation of unit power factor, taking into account all
AC load types in the form of compressors, fans and pumps.
The power factor correction system consists of a PFC regulator
and a number of dissimilar sized capacitors that are switched in
by means of contactors. The regulator type used has 6 staged
outputs that switch in a binary fashion resulting in a total number
of 64 unique capacitor step values.
During operation the PFC regulator measures the reactive power
drawn by the unit and then dependant on the instantaneous
unit load and user configurable target PF value, automatically
switches in the necessary capacitor stages to achieve the
desired unit target PFC. Factory set to a 0.98PF.
Single Point Isolation
Single point isolation shall be fitted as a standard
feature.
The feature is however available to be removed)
upon request, subject to your own 3 phase unit
mains isolator.
Power Meter
A power meter shall be fitted to the unit. Voltages, currents and power inputs can be monitored and recorded giving
power usage of the chiller. Current transformers are fitted to the unit’s incoming supply.
Electronic Soft Start
The electronic soft start enables the chiller compressor motor to be ramped to speed with the minimum full load current.
Further benefits include removal of nuisance tripping, supply voltage dips and motor overheating.
Optional Features