Temptek CF Series Instruction Manual page 55

CF Series Portable Chiller : Air & Water-Cooled : 5 - 40 Tons
G. 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 6.2G).
H. 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 6.2H).
I. CAPACITY CONTROL SOLENOID: The chiller is equipped
with a capacity control feature. The capacity control feature
matches the chiller capacity to the cooling load to provide
temperature control and to prevent short cycling of the
compressor. Units with digital scroll compressors (M1D) use
a solenoid valve to unload the compressor to a low as about
20% capacity. Units without a digital scroll compressor use a
hot gas bypass solenoid valve to reduce the chiller capacity to
about 50%.
J. HIGH/LOW PRESSURE SWITCH: The high and low
pressure switches protect the refrigeration system from usage
operating conditions. Units may be equipped with either an
adjustable or non-adjustable 'fixed' high and low pressure
switches.
The high pressure switch is factory set and protects the
refrigeration components and personnel from potential
damage and injury from excessive pressure. The high
pressure safety must not be altered in the field for any reason
(see section 8.1 for factory settings.
The low pressure switch is factory set to open at 32°F and
* See Temperature-Pressure
to close at 36°F - 38°F*. The low pressure switch protects
chart in Section 8.5 for
refrigerant pressure.
the chiller from damage caused by low refrigerant pressure
operating below the cooling fluid's freeze point.
NEVER LOWER THE CUT OUT SETTING WITHOUT
ADDING GLYCOL TO THE CIRCULATING SYSTEM.
EVAPORATOR DAMAGE WILL RESULT AND WILL NOT
BE COVERED BY THE WARRANTY.
K. Liquid receiver: (optional feature) located after the
condenser, this component receives and stores liquid
refrigerant leaving the condenser.
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.
525 East Stop 18 Road Greenwood, Indiana 46142
TEMPTEK, INC.
317-887-6352 Fax: 317-881-1277
Email: service@Temptek.com
Typical Liquid Line Solenoid
Typical Refrigerant Sight Glass
Typical Expansion Valve
Typical Brazed Plate Evaporator
Adjustable high
pressure switch
Adjustable low
pressure switch
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