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1.
Refrigerant Low Pressure Switch (SW-15)
– Detects refrigerant pressure on the low-pressure side
of the system. If the pressure drops below the preset value, the compressor will shut down. This
sensor has an automatic reset.
2.
Suction (Low) Line Pressure Sensor (PS-21)
– Pressure transducer that monitors the low side of the
refrigeration system.
3.
Filter/Drier
– Absorbs water and filters system contaminants.
4.
Reversing Valve (RV-01)
– A valve used for heat pump applications that changes the flow of
refrigerant. By changing the flow of refrigerant, the heat pump cycle is changed from cooling to heating
or heating to cooling.
5.
Hot Gas Reheat Valve(s)
– Valve(s) will modulate the supply of refrigerant to the outdoor
(condensing) coil and to the reheat coil. Units with a single reheat valve, HG-01, will be a three-way
valve. Units that use dual reheat valves, not shown, will have HG-01 in-line to the reheat coil inlet and
HG-02 in-line to the outdoor (condensing) coil inlet.
6.
Discharge Check Valve
– Restricts liquid migration back to compressor during off cycles.
7.
Refrigerant High Pressure Switch (SW-16)
– If the pressure rises above the preset value, the
compressor will shut down.
8.
Discharge (High) Pressure Transducer (PS-22)
– Pressure transducer that monitors the high side of
the refrigeration system.
9.
Reheat
Coil Check Valve
– Restricts refrigerant flow to the reheat coil when reheat is not active.
10.
Compressor Power Termination
–
Power connection from Compressor Drive Frequency Converter.
11.
Oil Return Solenoid Valve (OS-01)
– Allows oil to be distributed throughout the scroll set when
activated. Not applicable to VZH-044/065 compressors.
12.
Oil Level Sensor (SEN-01)
– Monitors the oil level in the compressor. If the oil level is low, the unit will
shut down.
13.
Crankcase Heater (HE-03)
–
A heating cable used to boil off liquid refrigerant within the crank of the
compressor.
14.
Compressor
– Circulates refrigerant throughout the system.
15.
Liquid Line Pressure Sensor (PS-20)
– Pressure transducer that monitors the liquid line pressure in
the refrigeration system.
16.
Refrigerant High Temperature Switch (SW-18)
– This safety switch opens at dangerously high
compressor discharge temperatures. For heat pump applications only.
Not Shown
:
•
High-Pressure Port
–
High-pressure gauge connection port.
•
Low-Pressure Port
–
Low-pressure gauge connection port.
•
Accumulator
– The accumulator prevents liquid flood back to the compressor. Used in heat pump and
certain cooling applications.
