39
We reserve the right to make changes without any prior notice.
Translation from original instructions
The heaters in the compressor crankcase are switched on when the master disconnect switch is closed: this
must be done at least 12 hours before starting the unit.
To check that the heaters are working correctly, check that the lower part of the compressors is hot and in any case at a
temperature of 10 - 15 °C above ambient temperature.
Check:
-
that the hydraulic connections have been made properly, according to the instructions given on the inlet / output plates
and that a mechanical filter has been installed at the unit’s inlet (a mandatory component, whose absence will invalidate
the warranty);
- that the hydraulic system has been vented, eliminating any excess air, loading it gradually and opening the venting
devices on the top;
- that the pump has been bled properly;
- that the installer has organised a storage tank with the appropriate capacity for the volume of the system’s water.
To bleed the pump, use the fill plug on the volute, as shown in the image.
Fig. 9 Bleeding the pump
Before starting the unit, check that all the closing panels of the unit are in place and secured with fixing
screws.
7.1.1 Checking the pre-charge of the expansion vessel
The values of the pre-charge pressure and the maximum pressure at which it can operate are stated on the label present
on the expansion vessel.
The pre-charge pressure of the expansion vessel must be adjusted to the hydraulic pressure at the point of installation.
At the time of installing the unit, make sure the pre-charge value is equal to the hydrostatic pressure value at the point of
installation increased by a precautionary pressure value (at least 0.3 bar), to ensure there are no areas under vacuum in
the system.
where
- pVE: new pre-charge pressure of the expansion vessel [barg]
-
Hmax: difference in level between the highest point of use and the installation level of the unit [m]
If the calibration value obtained from the calculation is lower than the pre-charge value stated on the label, keep the existing
pre-charge value.
The maximum value of the pre-charge pressure corresponds to the calibration pressure of the safety valve.
The checking of the pre-charge must be done for each installed vessel
