Conair VL Series - Manual (Page 28)

Page: 28 VL Series Portable Chillers, 0.25 to 1.5 Tons UGH020/0301
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 brass to maintain water quality.
6.2 REFRIGERATION SYSTEM
A. COMPRESSOR: hermetic compressors take low pressure/low
temperature refrigerant gas and compress the gas into high
pressure/high temperature gas).
B. AIR COOLED CONDENSER: the air cooled condenser removes
BTUs 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.
C. FILTER-DRIER: the filter-drier removes contaminants and
moisture from the liquid refrigerant.
D. LIQUID RECEIVER: serves as a collection tank for high pressure
liquid refrigerant to ensure total charge at all times.
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.
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.
G. EVAPORATOR: the evaporator is a tube in tube 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.
H. 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.