Johnson Controls SABROE DualPAC, Руководство по эксплуатации

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Operating manual – DualPAC with reciprocating compressors
0012201 en 2021.04
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Design and function
3.2 Main components
3.2.1 Compressors
The compressors on the DualPAC are Sabroe standard compressors, complete with stop valves,
motor, oil separator etc. For further information, please see the compressor operating manual.
3.2.2 Control system
The DualPAC is delivered with two UniSAB III monitoring, safety and capacity regulating systems.
The control system is described in the UniSAB III manual.
UniSAB III setting list for each specific order is enclosed with the manual.
The UniSAB III settings must always be checked before start-up.
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 in a demister
above the plates.
The evaporator has two sets of brine connections and can be ordered with a manifold.
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 GHUR intermediate cooler
The GHUR intermediate cooler is placed between the LP and the HP sides. The liquid from the HP
condenser is expanded into the GHUR where it is mixed with - and cooling down - the discharge
gas from the LP compressor. In a mixing chamber, the vapours in the vessel are sucked by the HP
compressor, and the liquid is directed to the evaporator by the LP regulating system.
There are three sight glasses at the end cover.
3.2.5 Condenser
The DualPAC 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 cir-
culates in the channels between the cassettes.
The condenser is available with a built-in desuperheater and/or subcooler section (1in1/2in1/
3in1).