Starting Operation - Galletti LCA Series Installation, Use And Maintenance Manual

LCA
Check that the crankcase heating elements are properly connected to the power supply.
-
The heating elements must be turned on at least 12 hours before the unit is started.
Their function is to raise the T of the oil in the sump and limit the quantity of
refrigerant dissolved in it.
To verify whether the heating elements are working properly, check the lower part of the compressors:
it should be warm or in any case at a temperature 10 - 15 °C higher than the ambient temperature.
Pressure
The diagram above illustrates a specific property [Charles' Law] of gases, which are more soluble in
liquids as the pressure increases but less soluble as the temperature increases: if the oil in the sump is
held at a constant pressure, an increase in temperature will significantly reduce the amount of
refrigerant dissolved in it, thus ensuring that the lubricating function desired is maintained.
- Check that the plumbing connections have been properly made according to the indications given on
the plates to be found on the unit itself (proper inlet and outlet connections).
- Make sure that the water circuit is duly bled to completely eliminate the presence of air: load the circuit
gradually and open the air vent valves on the top part, which the installer should have set in place.

STARTING OPERATION

Before starting the chiller, turn the main switch off, select the operating mode desired from the control
panel [red button = heating, green button = cooling] and press the "ON" button on the control panel.
The unit will start up if enabled:
by the safety devices of the water circulation pump/s
-
by the flow switch (or differential pressure switch)
-
by the T sensor measuring the temperature of the water returning from the system [chiller inlet]
-
and no alarms have been triggered
If the unit fails to start up, check whether the service thermostat has been set according to the nominal
values provided
RG66000986 – Rev.00
Oil T
% R407C in oil
14