Galletti LCA Series Installation, Use And Maintenance Manual page 26

LCA
FAULT
The unit does not start
The compressor is noisy
Presence of abnormally high
pressure
RG66000986 – Rev.00
Possible causes
No power supply
The electronic card is cut off from
the power supply
Alarms have been triggered
The phase sequence is wrong
The compressor is rotating in the
wrong direction
Insufficient flow of air to the
condenser
Presence of air in the refrigerant
circuit, as revealed
presence of bubbles in the flow
indicator also with undercooling
values exceeding 5 °C
Unit overcharged, as revealed by
an undercooling of more than 8 °C
Thermostatic valve and/or filter
obstructed. These symptoms may
also occur in the presence of an
abnormally low pressure.
Insufficient flow of water in the
case of heat pump operation
26
Corrective actions
Check that power is being supplied
both to the primary and auxiliary
circuits.
Check the fuses
Check whether any alarms are
signalled on the microprocessor
control panel, eliminate the causes
and restart the unit.
Invert two phases in the primary
power line
them upstream from the unit
Check the phase sequence relay.
Invert the phases on the terminal
board after disconnecting the unit
and contact the manufacturer.
Check whether all the fans are
turning properly
Check the air T at the condenser
inlet and make sure no back
suction occurs
Check whether the effective RMS
voltage to
maximum. If necessary, check the
pressure transducers controlling
the revolution regulator, where
present [optional]
Check the cleanliness of the finned
coils
Drain and pressurise the circuit
by the and check for leaks. Generate a
slow vacuum [longer than 3 hours]
until reaching a pressure of 15 Pa
and then recharge in the liquid
phase
Drain the circuit
Check the temperatures upstream
and downstream from the valve
and filter and replace them if
necessary.
Check the
pressure drops and/or whether the
pump is working properly [direction
of rotation]. Check the outgoing
water T and make sure it less than
or equal to 45°C
after disconnecting
the fans is the
water circuit for