Main Components; Compressor; Control System; Evaporator - Johnson Controls SABROE ComPAC Operating Manual

Design and function
3.2

Main components

3.2.1

Compressor

The compressor is a Johnson Controls Denmark standard compressor, complete with stop valves,
motor, etc. For further information, see the compressor operating manual.
3.2.2

Control system

Chillers are delivered with Unisab III monitoring, safety and capacity regulating system.
The control system is described in the Unisab III manual.
Unisab III setting list for each specific order is enclosed with the manual.
If the actual operating conditions are different from the design conditions, the settings must be
checked.
VSD settings are stated in the wiring diagrams.
Note: Changes in factory settings must only be carried out by competent personnel.
3.2.3

Evaporator

The evaporator is a fully welded plate heat exchanger where plates are welded together into cas-
settes. R717 evaporates between the two welded plates which make up the cassettes and water/
brine is cooled in the channels inside the cassettes. The R717 droplets are separated from the va-
pour in the separator room above the plates.
The evaporator has one or two sets of brine connections depending on size and operating
conditions.
A sight glass is mounted at the end cover.
Note: The liquid level must never be visible in the inspection glass. See subsection 6.3 R717
charge and the P&I diagram for correct charge.
3.2.4

Condenser

The ComPAC is equipped with a water-cooled condenser. The condenser is a fully welded plate
heat exchanger where plates are welded together into cassettes.
R717 condenses between the welded plates which make up the cassettes and cooling water circu-
lates in the channels between the cassettes.
The liquid expansion system is based on a high pressure regulating system which is built into the
bottom of the condenser.
Operating manual - ComPAC
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