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PROBLEM
THE COMPRESSOR DOES NOT
WORK WHEN CALLED BY THE
THERMOSTAT
THE COMPRESSOR INTERNAL
PROTECTION CUTS IN
N.B. Before starting the
compressor, check compressor
winding resistance and continuity
THE COMPRESSOR IS NOISY
LOW OUTPUT PRESSURE
HIGH INTAKE PRESSURE
POSSIBLE CAUSE
One of the unit's safety devices
has intervened
Short circuit protection has
intervened
The LP pressostat or anti-freeze
protection has intervened
The control system is not giving a
correct system
The flow gauge does not give the
compressor start-up command
A phase is missing
The motor is overloaded
The rotor is blocked
Liquid return to the compressor
The compressor is damaged
The condensation pressure control
system is not efficient
The chiller is functioning with
external air temperatures which
are too low
Chilled water return temperature is
higher than normal
Liquid refrigerant return to the
compressor
43
CHECK/CORRECTIVE ACTION
Check for alarms on the user
terminal display
Check the cause of the short circuit
and change the fuses
See
'Low
output
intervention
of
low
pressostat'
or
'The
protection cuts in'
Check the control system
Check the water flow and the flow
gauge and pump function
Check the compressor's electrical
connections
Check that the unit is functioning
within the temperature limits given
in this manual
Change the compressor
Check
the
function
superheating of the expansion
valve
Call the nearest service centre for
repair
or
replacement
compressor
Check the function of the fan
speed regulators
Check the function of the air
temperature sensor
Check that the unit is functioning
within the temperature limits given
in this manual
Check that the unit is functioning
within the temperature limits given
in this manual
Check
the
function
expansion valve and the correct
positioning of the bulb
Check that superheating of the
thermostatic
valve
(approx. 5°C)
pressure
or
pressure
anti-freeze
and
of
the
of
the
is
correct
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