Technical information

Page: 44
VL Series Portable Chillers, 2 to 40 Tons UGH021/0301
6.1 WATER SYSTEM
A. MOTOR/PUMP ASSEMBLY: the
motor/pump assembly circulates
chilled fluid to the process loop.
The pump assembly is built of total
stainless steel to maintain water
quality (figure 6.1A).
B. FREEZESTAT: the freezestat aids in
protecting the evaporator from
potential freezing. The freezestat is
factory adjusted to 40°F. The
freezestat must be field adjusted for
operating with setpoints below
48°F (figure 6.1B).
6.2 REFRIGERATION SYSTEM
A. COMPRESSOR: hermetic or semi-
hermetic compressors take low
pressure/low temperature
refrigerant gas and compress the
gas into high pressure/high
temperature gas (figure 6.2A).
B1. WATER COOLED CONDENSER:
the water cooled condenser
removes BTU’s (heat) from the
compressed refrigerant gas. As the
heat is removed, the gas
“condenses” into a liquid state, still
under high pressure. Tube-in-shell
condensers are used on 15-30 ton
models. Tube-in-tube condensers
are used on 5-10 ton models.
Water regulator valves are used on
all models to control the refrigerant
head pressure by modulating the
condenser water flow (figure
6.2B1).
B2. AIR COOLED CONDENSER: the air
cooled condenser removes BTU’s
from the compressor refrigerant
gas. The action causes the gas to
“condense” into a liquid state still
under high pressure. Air flow across
the condenser is achieved via a
motor driven fan assembly or
centrifugal blower (figure 6.2B2).
Mechanical freezestat
Figure 6.1B
Hermetic compressor
Semi-hermetic compressor
Figure 6.2A
Pump
Figure 6.1A
Tube/shell
condenser
Regulator
valve
Tube/Tube condenser
Figure 6.2B1