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Operation and Maintenance
ThermoCooler HP
DSTCH.191101.01.EN
Continuous product development may give rise to specification changes without notice.
6 Alarm management and troubleshooting
For units with control equipment (code MX), alarm information can be read on
the Climatix display.
For units without control equipment (code UC, MK, US), alarm information can
be read on the Carel display.
Press the alarm symbol to view alarms.
6.1 Troubleshooting in the event of an alarm
Inspection
Possible cause
Corrective action
Has the high pressure
switch tripped?
YES
⇒
No or too low air flow across the
condenser
Check the air flow across the
condenser.
Rest the pressure switch
manually.
Defective high pressure switch
Check/replace
NO
⇓
Is the alarm
“118 Compr 1,
Low evaporation pres-
sure” or
“176 Compr 2, LowEvap-
Pressure” displayed?
YES
⇒
Insufficient refrigerant volume
Look for leakage, seal the leak
and top up with refrigerant
No or too low air flow across
evaporator
Check/adjust the flow
Defective expansion valve
Check/replace
NO
⇓
Is the LED flashing red on
the frequency inverter?
YES
⇒
Phase failure/voltage failure
Check the 3-phase supply,
measure the incoming
voltage.
Reset the frequency inverter
by switching off the voltage
for 1 minute or more. Check
that the compressor is running
without dissonance.
Overload/defective stepless
compressor
Reset the frequency inverter
by switching off the voltage
for 1 minute or more. Check
that the compressor is running
without dissonance.
NO
⇓
Is the alarm
“189 Phase Rotation
order”displayed?
YES
⇒
Incorrect phase sequence for
supply voltage on compressor 2
Shut off voltage and switch
two of the incoming phases
NO
⇓
Is the alarm
“94 Drive
offline”displayed?
YES
⇒
ThermoCooler HP does not have
supply voltage 3×400V
Connect supply voltage
