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2.11. INSTRUCTIONS FOR FINE TUNING AND GENERAL REGULATION
Calibration of safety and control devices
The units are tested in the factory, where they are also calibrated and the default parameter settings are put in. These guarantee that the appliances run
correctly in rated working conditions. The devices which monitor safety of the unit are the following:
• High pressure safety valve
• High pressure switch (PA)
• Low pressure transducer (triggers low pressure alarm, see Electronic Control Manual coupled to the unit)
• Water differential pressure switch
Pressure switch
high pressure
water differential
high pressure safety valve
DANGER!
The safety valve on the high pressure side is calibrated at 45 bar. It can intervene if the calibration value is reached while the refrigerant
is being filled, causing a burst that could cause burns (just like the other valves of the circuit).
Operation of components
Compressor functioning
Scroll compressors are equipped with thermal protection. Once the inner circuit breaker has tripped, normal operation is automatically resumed when the
windings temperature drops below the pre-set safety value (this can take from a few minutes to several hours). All compressors are equipped with circuit
breaker with auxiliary contact that signals tripping connected to the electronic board.
Operation of work, antifreeze and pressure probes
The water temperature probes (work probes and antifreeze) are inserted inside a well in contact with the conductive paste and blocked on the outside with
silicone.
▪ one is placed at the entrance of the heat exchanger and measures the temperature of the return water from the system;
▪ the other one is placed at the evaporator outlet and acts as work and antifreeze probe.
Always check that both wires are firmly welded to the connector and that this is properly inserted in the housing on the electronic board (see wiring diagram
provided). In order to check the efficiency of the probe, use a precision thermometer immersed with the probe in a container full of water at a certain temper-
ature, after having removed the probe from the socket paying attention to not damage it in the process. The probe must be carefully repositioned by placing
some conductive paste in the socket, inserting the probe and re-sealing the external part with silicon to avoid unscrewing. In the event the antifreeze alarm
triggers, reset the alarm from the control panel; the unit starts only when the water temperature exceeds the intervention differential. The exhaust tempera-
ture probes are inserted inside a special sump welded externally to the delivery pipe of both compressors. These probes signal to the electronic board ab-
normal increases in the exhaust temperature, generating a thermal protection alarm.
Pressure probes (transducers) are installed:
• on the high-pressure branchmeasures the high pressure, generating the relevant alarms and activating the relevant protections. Adjust the summer oper-
ation condensation control.
• on the low-pressure branchmeasures low pressure and generates the relevant alarms and protections. They manage the behavior of the electronic ex-
pansion valve, generate the low pressure alarm and regulate the evaporation control in winter operation.
Operation of the electronic expansion valve
The electronic expansion valve is managed to maintain adequate liquid subcooling and a correct refrigerant level in the evaporator. The operator is not
called upon to perform calibration since the control software of the valve monitors these operations automatically.
Functioning of PA: high pressure switch
After the pressure switch has been triggered, it must be reset manually by pressing the black button on the pressure switch itself completely and reset the
alarm from the control panel. Refer to the Troubleshooting section to detect the problem and carry out the necessary maintenance.
H5xxxxx
74
Intervention
Reset
44 bar
36 Bar - Manual
27 mbar
50 mbar - Automatic
48 bar
-
EasyPACK ECO - Nias
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