Page 9
Operation and Maintenance
ThermoCooler HP
DSTCH.191101.01.EN
Continuous product development may give rise to specification changes without notice.
Compressor protection
In the event of an alarm initiated by the control equipment or the safety circuit,
the compressor stops and an alarm indication is given. The alarm can be read
on the Climatix display or the Carel unit on the unit’s circuit board.
In the event of an alarm, correct the fault and then reset the alarm. If alarm trips
repeatedly, an authorised refrigeration service company must be called in.
The cooling/heating pump will primarily trip alarms for the following errors:
• High pressure in the system, manual reset on pressure control HP1
• Low pressure in the system
• Alarm from frequency inverter
• Incorrect phase sequence (size 600-980).
Function
The reversible heat pump is interlocked across the air handling unit. If any of the
fans stop, the cooling/heating pump will also stop. The reversible heat pump is
not permitted to start unless the minimum air flow has been achieved. The same
applies if a heater is fitted.
The interlock and demand signal is sent via Modbus.
Circuit board
The circuit board for the unit contains:
• Main switch
• Fuses
• Control unit
• Any control unit for expansion valve next to fixed compressor.
The circuit board is installed inside the unit and is internally prewired and tested
at the factory.
