9
GENERAL FEATURES
Hydraulic and cooling circuit components
7.One-way valves
(IP unit only), allowing the refrigerant gas to pass into the appropriate exchangers, depending on the operating
cycle.
8. 4-way cycle reversal valve
(IP unit only), reverses the flow direction of the refrigerant gas as the summer/winter operating mode
is changed.
9. Safety valve.
Installed on the delivery pipe of the compressors, this operates if extreme faults should occur in the plant.
10. Fluid valve (accessory).
Ball type, this allows the gas flow on the fluid line to be turned on and off. Along with the cock on the
compressor delivery, it allows the components of the fluid line to be subjected to extraordinary maintenance work and the compres-
sors to be replaced if necessary (without discharging the refrigerant gas from the unit).
11. Compressor delivery valve (accessory)
. Ball type, allows the gas delivered to the compressors to be turned on and off.
12. Dehydrator filter.
Mechanical type. Retains impurities and traces of moisture in the circuit.
Hermetic type for
13. Fluid and humidity indicator
. Signals when fluid passes through the circuit, indicating that the refrigerant gas charge is correct.
The fluid indicator light also indicates the amount of moisture in the refrigerant gas by changing colour.
14. Low pressure
switch (N°1 of series IR version, N°2 of series IP version). With fixed setting. It is installed on the suction pipe and
blocks the compressors if the operating pressures drop below the tolerated values. Automatically resets as the pressure increases. If
it activates frequently, the unit will block and can only be restarted by resetting via the user interface terminal.
15. High pressure switch
(n°2). With fixed setting. Are is installed on the delivery pipe and blocks the compressors if the operating
pressures exceed the tolerated values. If it activates, the unit will block and can only be restarted by resetting via the user interface
terminal.
16. Expansion valve:
- Thermostatic valve
(standard for IR and BR unit) with external equalizer, this supplies the evaporator correctly, keeping the selec-
ted overheating degree at a steady level.
- Electronic valve
(standard for IP and BP unit, optional for IR and BR unit) supplies the evaporator correctly, keeping the selected
overheating degree at a more steady level; ensures a faster response to load changes and superior stability which translates into
increased efficiency at partial loads.
17. Water differential pressure switch.
This is standard supply and is installed on the connections between the water inlet and
outlet of the exchanger. It stops the unit if it activates.
18. Pressure taps:
1/4 " SAE (7/16" UNF) type with flow regulator. Allow the operating pressure of the system to be measured:
compressor delivery, lamination component inlet, compressor intake.
19. Pressure taps:
5/16 " SAE type with flow regulator. Allow the charge/discharge of the gas from the system, precisely from com-
pressor outlet an expansion valve inlet.
20. Electrical heating elements to heat the compressor oil. "Belt" type (accessory for IR, as standard for IP).
These activate
when the compressor turns off and keep the temperature of the oil sufficiently high so as to prevent refrigerant gas from migrating
during these pauses.
Fluid receiver
(IP unit only), this is a plenum tank that accounts for variations to the refrigerant gas charge the unit must supply
as the summer/winter operating mode varies.
Fluid separator
(IP unit only), on the compressor intake to protect against possible fluid back-flows.
mod. 40÷100 or a cartridge type for mod. 115÷180.
