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source/sink heat exchanger to operate as an evaporator or
condenser.
Refrigerant Piping
Piping is Type K seamless copper suction line covered in
closed-cell foam insulation, compressor rotalock service
valves, solenoid valves for compressor pumpdown, and
Schrader service valves in the suction, discharge, and
liquid lines.
Electronic Expansion Valve
Flow Switch
CAUTION
Equipment Damage!
Failure to follow instructions could result in equipment
damage. Do not jumper out the flow switch.
Refrigeration Controls
Controls on the refrigeration system are designed to
provide safety for the major components and for proper
operation of the system.
Pressure transducers convert pressure into an electronic
signal that the microprocessor displays in pounds per
square inch (psi). Transducers vary in pressure ranges that
depend on the type of refrigerant used. Pressure
transducers are calibrated using the touchscreen interface
panel.
Temperature sensors transmit temperature data
electronically to the microprocessor for display in either
Fahrenheit (°F) or Celsius (°C). Temperature sensors are
calibrated using the touchscreen interface panel.
ARTC-SVX005A-EN
Fluid Piping
The fluid piping is Schedule 10 steel covered in closed-cell
foam insulation to prevent condensation and retain heat
and cold. Each heat recovery module is connected to the
adjacent module using roll grooved steel couplings and
neoprene gaskets on all joints.
An expansion valve is a metering device controlling the flow of refrigerant to the
evaporator based on evaporator superheat. The electronic expansion valve is
designed to act as the expansion device for the PolyTherm Chiller/Heater.
Incorporated sight glass monitors movement of the movable element and
refrigerant flow inside the system. The valve is made from modular elements
assembled during installation, to simplify maintenance and inspection of the
components.
A flow switch is wired into the low voltage control circuitry used to detect the flow
of liquid throughout the closed loop piping system. The differential pressure switch
detects water/glycol mixture flow through a pressure differential in the discharge
line. Flow switches are found on all evaporators with isolation valves. Flow switches
close when flow is detected allowing compressors to start. If there is no flow,
compressors cannot operate.
Low Pressure Bypass
Logic that uses a time delay that temporarily bypasses the
low-pressure switch for compressor start up. Once the
delay times out the normal controls are put back on line
within the control circuit.
Chiller/Heater and Description
15
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