Technical data

2.13 Water Boxes
Removable water boxes fabricated from heavy gauge
sheet steel are fitted to each end of both heat
exchangers. The design working pressure is 10 bar and
the boxes are tested at 15 bar. Integral steel water
baffles are located and welded within the water boxes to
provide required pass arrangements. Stub-out water
nozzle connections with Victaulic grooves are welded to
the water boxes. These nozzle connections are suitable
for Victaulic couplings, welding or flanges, and are
capped for shipment. Plugged 19mm drain and vent
connections are provided in each evaporator and
condenser water box.
2.14 Control Centre
The control centre is factory mounted, wired and tested.
The centre automatically controls the operation of the
unit in meeting cooling requirements while minimising
energy usage. Unit operating parameters are sensed by
thermistors and transducers and can be viewed on the
keypad display. All pressures are taken as gauge
pressure. Temperatures and pressures can be
displayed in Imperial ('F, psig) or metric ('C, kPa) as
required. Display of all information is shown in the
English language on a 40-character alphanumeric
display.
Available operating information includes return/leaving
chilled liquid temperatures; return/leaving condenser
water temperatures; evaporator/condenser refrigerant
pressures; oil pressures at compressor and oil filter
differential; percent motor current;
evaporator/condenser saturation temperatures;
compressor discharge temperature; oil temperature;
percent slide valve position, operating hours and
number of compressor starts.
2-8 035L02381-GB0
Figure 2.6 Capacity Control