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II.12 Instructions for fine tuning and general regulation
II.12.1 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 Con-
trol Manual coupled to the unit)
• Differential water pressure switch
Pressure switch
high pressure
water differential
High pressure safety valve
DANGER!
The safety valve on the high pressure side is calibrated at 43 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).
II.12.2 Operation of components
II.12.2.1 Compressor functioning
Scroll fixed compressors (solo 2115-2130) are equipped with internal circuit
breaker protection.
Once the inner circuit breaker has tripped, normal operation is automati-
cally resumed when the windings temperature drops below the pre-set
safety value (this can take from a few minutes to several hours).
All fixed compressors are equipped with a thermal magnetic circuit
breaker with auxiliary contact signaling signal connected to the electronic
board (thermal protection alarm contact for 270 ÷ 2100, or in series with
the internal thermal protection where present for 2115-2130).
II.12.2.2 Operation of work probes, antifreeze, discharge and pressure
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 antifre-
eze 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 pre-
cision thermometer immersed with the probe in a container full of water
at a certain temperature, after having removed the probe from the socket
paying attention to not damage it in the process. Pay attention when re-
positioning the probe, by applying conducting paste in the socket, placing
the probe and applying silicon on the external parts so to block it. 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 temperature probes are inserted inside a special sump
welded externally to the delivery pipe of both compressors. These probes
signal to the electronic board abnormal increases in the exhaust tempera-
ture, generating a thermal protection alarm.
Pressure probes (transducers) are installed:
• on the branch of high pressure
it measures the high pressure by generating its alarms and activating
and activating its protections. Adjust the summer operation condensa-
tion control.
• on the low pressure branch
it measures the low pressure generating the relative alarms and the rela-
tive protections. They manage the behavior of the electronic expansion
valve, generate the low pressure alarm and regulate the evaporation
control in winter operation.
56
Intervention
Reset
42 Bar
33 bar - Manual
80 mbar
105 mbar - Automatic
43 bar
-
EQPI3X
II.12.2.4 Electronic thermostatic valve functioning
The electronic thermostatic expansion valve is calibrated to maintain the
gas superheated suitable to avoid any liquid being sucked into the com-
pressor. The operator is not called upon to perform calibration since the
control software of the valve monitors these operations automatically.
II.12.2.5 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 re-
set the alarm from the control panel. Refer to the Troubleshooting section
to detect the problem and carry out the necessary maintenance.
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