LCP
RG66006889-Rev.01
20
pCO
7 STARTING
UP
7.1
PRELIMINARY CHECKS
-
Check that all the valves in the cooling circuit are open (liquid line).
-
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 in the middle right part of
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 5-10 minutes 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.
