RG66001652_REV.02
24
LCW - LCR
Remote controls
If you wish to include a remote control for switching the unit on and off, you must remove the bridge
between the contacts indicated in the wiring diagram and connect the remote ON/OFF control to the
terminals themselves [see annexed wiring diagram], then enable the "REMOTE" function by means of
the switch provided in the electric board.
Summer Winter Remote Switching (Heat pump version)
If you wish to include a remote control for summer/winter switching of the unit, you must remove the
bridge between the contacts indicated in the wiring diagram and connect the remote ON/OFF control to
the terminals themselves [see annexed wiring diagram], then enable the "REMOTE" function by means
of the switch provided in the electric board.
STARTING UP
Preliminary checks
-
Check that the cocks of cooling circuit (if present) are open.
-
Check that the electrical connections have been made properly and that all the terminals
are
securely tightened
. This check should also be included in a periodic six-month inspection.
-
Check that the voltage at the RST terminals is 400 V ± 5% and
make sure
the yellow indicator light
of the phase sequence relay is on. The phase sequence relay is positioned on the electric control
board; if the sequence is not duly observed, it will not enable the machine to start.
-
Make sure there are no refrigerant leaks that may have been caused by accidental impacts during
transport and/or installation.
-
Check the power supply to the crankcase heating elements, where present.
The heating elements must be turned on at least 12 hours before the unit is started.
This function is carried out automatically when the main switch is off. 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.
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 oil 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.
Pressure
% of R407C in oil
Oil T
