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Hydraulic and chilling circuit components
13. 4-way cycle reversing valves. Reverse the direction in which the refrigerant flows when the operating mode changes
(Cooling mode or Heating mode).
14.Refrigerant safety valve. (Conforms to the Directive governing pressurized vessels -PED). Installed on the delivery pipe of
the compressors. It acts if critical service faults should occur.
15.Fluid cock -Gas cock. Allow all the refrigerant in the coils to be pumped and then stored so as to carry out servicing work
or to replace all the components of the chilling circuit without having to drain it.
16.Dehydrator filter. Of the removable cartridge type. Retains impurities and traces of moisture in the circuit.
17.Fluid and humidity indicator. Signals when fluid passes through the circuit, indicating that the refrigerant charge is correct.
The fluid indicator also changes colour to show the amount of moisture in the refrigerant.
18.Low pressure switch. With fixed setting. It is installed on the intake pipe and blocks the compressors of the circuit in que-
stion if the operating pressures drop below the tolerated values. It automatically resets as the pressure increases. If it activa-
tes frequently, the circuit in question will block and can only be restarted by resetting via
the user interface terminal.
19.High pressure switch. With fixed setting. It is installed on the delivery pipe and blocks both the compressors of the circuit if
the operating pressures exceed the tolerated values. If it activates, the circuit will block and can only be restarted by resetting
via the user interface terminal.
20.Electric resistors to heat the compressor oil. Belt type, one per compressor. They activate when the compressor turns
off. Their task is to keep the temperature of the oil sufficiently high so as to prevent refrigerant from migrating during these pau-
ses.
21.Fluid receiver. One per circuit. They are plenum tanks that account for the refrigerant charge variations required by the
machine as the operating modes change (Cooling mode or Heating mode).
22.Fluid separator. One per circuit, installed on the intake part of the compressors to protect against backwashing.
23.Fluid solenoid valve.One per circuit. They shut off when both the compressors of the circuit switch off, preventing liquid refri-
gerant from flowing towards the evaporator during periods at a standstill.
One-way valves. Make the refrigerant obligatorily pass through the appropriate heat exchangers, depending on the operating
cycle.
Thermostatic valve. With external equalizer. It s task is to supply the evaporator correctly, keeping the selected degree of super-
heat at a steady level.
High temperature thermostat. One per compressor, installed on the delivery pipe to protect the compressor if the end of com-
pression temperature exceeds 130° C.
Differential water pressure switch. This is standard supply and is installed on the connections between the exchanger s water
inlet and outlet. It blocks the unit if it activates.
Pressure taps: 1/4 " SAE (7/16" UNF) type with air pump. Allow the operating pressure of both the circuits to be measured in
3 main points: compressor delivery, flow-restricting component inlet, compressor intake.
GENERAL SPECIFICATIONS
7
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