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H.
I.
J.
K.
L.
Page: 46
HIGH/LOW PRESSURESTATS: the
high/low pressurestats protect the
refrigeration system from unsafe
operating levels. The high pressure
switch is factory set to open at 325
psi and protects the refrigeration
components and personnel from
potential damage of injury from
excessive high pressure. The high
pressure safety must not be altered
in the field for any reason. The low
pressure switch is factory set to
open at 58 psi and to close at 63
psi. The low pressure switch
protects the chillers from possible
damage due to low operating
pressure. The low pressure switch is
field adjustable for setpoints below
48°F (figure 6.2I).
Liquid receiver: located after the
condenser, this component receives
and stores liquid refrigerant leaving
the condenser.
Service valves: have been provided
throughout the system. Only a
qualified refrigeration service
technician shall operate these
valves.
Crankcase heater: insures that
freon and compressor crankcase oil
do not mix during the compressor's
'off ' cycles. (Semi-hermetic only)
Oil pressure safety switch:
protects the compressor from
lubrication failure. (Semi-hermetic
only)
VL Series Portable Chillers, 2 to 40 Tons
Typical expansion valve
Typical evaporator
Figure 6.2G
Typical hot gas bypass valve
Figure 6.2H
High pressurestat
Low pressurestat
UGH021/0301
Figure 6.2F
Figure 6.2I
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