Alarms And Warnings List - Lauda UC 2 Operation Manual

7.2 ALARMS AND WARNINGS LIST

See the following table for the main possible causes for an alarm or warning and their solution:
FAULT
AL145, 158, 462 or
546
HP alarm by pressure
switch
Alarm due to high
pressure of the
T
refrigerant: he pressure
of the fridge circuit is
higher than the
maximum allowed. It
stops the compressor
AL165
Alarm freeze evaporating
temp.
Alarm due to low
evaporating temperature:
The evaporation
temperature is too low
and there is risk of
freezing. It stops the
compressor if it happens
3 times in a short period
CAUSE SOLUTION
Panel(s) of the Close the panels
housing open (only
UC 8 to UC 100)
Low airflow into the Check that there is enough free
condenser space in front of the condenser
and clean the condenser if
necessary
The ambient Wait until the ambient
temperature is too temperature is lower
high
Motor fan not The motor fan is not working if it is
working not turning when the chiller is
running and then tripping by this
alarm. Contact authorized
technical service
High pressure switch Contact authorized technical
failure service
Water circuit blocked Clean the water circuit. If
necessary replace the water filter
element. Check for closed valves
in the circuit
Possible freezing due The ethylene glycol concentration
to low ambient must be according to point 4.1
temperature and the antifreeze setpoint also
has to be adjusted accordingly.
Contact authorized technical
service
Water tank Measure the water temperature
temperature sensor inside the tank and check that it is
fault approximately the same as shown
on the controller's display. If it isn't
contact authorized technical
service
35
RESTART PROCEDURE
Disconnect the chiller by
turning Off the main power
switch (see point 5.1). Turn it
back On after at least 30
seconds have passed
Disconnect the chiller by
turning Off the main power
switch (see point 5.1). Turn it
back On after at least 30
seconds have passed