Advantage Engineering Maximum Instruction Manual page 61

MK Series Portable Chiller : Air-Cooled : HE INSTRUMENT
D. LIQUID LINE SOLENOID VALVE:
controlled by the instrument, this
valve closes when the compressor
cycles off to prevent refrigerant
liquid from migrating to the
evaporator. The valve opens when
the compressor cycles on.
E. REFRIGERANT SIGHT GLASS: the
refrigerant sight glass indicates
refrigerant charge and moisture
content. Refrigerant charge is
determined by a clear liquid flow.
Bubbles indicate low refrigerant.
Moisture content is indicated by
the color of the element. Element
color is normally green. If the color
of the element is chartreuse or
yellow, the system has been
contaminated with moisture. In
such case, the filter-drier must be
replaced. The replacement of the
filter-drier must be completed by a
qualified refrigerant service
technician (figure 6.2D).
F. EXPANSION VALVE: the expansion
valve throttles flow of refrigerant
liquid into the evaporator and
creates a pressure drop in the
refrigerant system that allows the
liquid refrigerant to "boil off" inside
the evaporator (figure 6.2E).
G. EVAPORATOR: the evaporator is a
brazed plate heat exchanger where
the refrigerant liquid is allowed to
evaporate (boil off) to absorb heat
(BTU) from the process fluid. As the
heat is absorbed, the process fluid
is chilled (figure 6.2F).
H. HOT GAS BY-PASS SOLENOID: the
hot gas by-pass solenoid prevents
short cycling of the compressor by
reducing the capacity by 50%
when the process fluid temperature
nears the setpoint.
I. HIGH/LOW PRESSURESTATS: the
high/low pressurestats protect the
refrigeration system from unsafe operating levels. The high
Fans
Typical filter-drier
Refrigerant sight glass
Expansion Valve
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: 317-881-1277
Service Department Fax: 317-885-8683
Email: service@AdvantageEngineering.com
Blower
Figure 6.2B
Figure 6.2C
Figure 6.2D
Figure 6.2E
Page: 61