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Translation from original instructions
7.4 Checks during operation
With the circuits operating at 100% and stable at working conditions near the nominal ones, check:
- that the electrical absorption of the unit is close to the data shown in the wiring diagram. Considerably different values
may be due to the reduced capacity operation of the unit, at working conditions very different from nominal ones, or to
the malfunctioning of one or more components.
- that the difference in water temperature in the user circuit, read between the inlet and outlet of the unit falls within the
allowed range given in the Technical Catalogue.
- higher values indicate that there is a reduced water flow rate through the unit. In this case, it is necessary to check for
closed or partially closed shut-off devices in the hydraulic circuit and check the characteristics of the pumps and that
they are working correctly.
- lower values indicate that the water flow rate through the unit is too high. In this case, the water flow rate through the
system must be reduced by acting on the control switch (if any) of the pumps or by partially closing the shut-off device
placed at the outlet of the unit.
- the superheating value of the suction gas. The optimal value must be between 4 and 7°C;
- the subcooling value of the liquid leaving the condenser. The optimal value must be between 5 and 10 °C.
- that the water temperature at the outlet of the source circuit falls within the allowed range given in the Technical Cata-
logue;
- lower values indicate condensation control problems associated with water flow rate;
- that the difference between the condensing temperature of each circuit and the water temperature read at the outlet of
the source-side heat exchanger is within 6°C.
For units with remote condenser, also check that the difference between the condensing temperature of each circuit and
that of the air is less than 25°C. If it is greater, check that all the fans involved are turning correctly and that no parts are
obstructing the condensing coil.
