Operation and Maintenance Instructions
NEW EcoCooler
DSKE180401.00.EN
Page 8
Continuous product development may give rise to specification changes without notice.
Compressor
The EcoCooler is fitted with a speed-controlled compressor. Depending on the
size, the EcoCooler can also be fitted with a switch controlled compressor.
When cooling is required, the frequency inverter increases the speed of the
compressor. When there is more than one compressor, they are activated in
fixed steps while the speed-controlled compressor is activated between steps.
The function is reversed where less cooling is needed.
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. If the unit is equipped
with integrated control equipment, the alarm can be read on the Climatix display.
In the event of an alarm, correct the fault and then reset the alarm. If the safety
circuit alarm trips repeatedly, an authorised refrigeration service company must
be called in.
The safety circuit consists of a high pressure switch with a manual reset button.
The safety circuit can trip in the event of high pressure in the system. To avoid
accidental stoppages at high pressure, the unit will lower the power using the
high pressure sensor.
Cooling function
For internal control (MX), the cooling unit is interlocked across the ventilation
unit. If any of the fans stop, the cooling unit will also stop. The interlock and de-
mand signal is sent via Modbus.
For external control (US, UC and MK), the interlock signal must be sent via a
potential-free relay. The demand signal must be sent via 0–10 V.
Circuit board
The circuit board for the cooling unit contains the following:
• Main switch
• Fuse
• Control unit with integrated control for expansion valve next to speed con-
trolled compressor
• Control unit for expansion valve next to fixed speed compressor
The circuit board is installed inside the unit and is internally prewired and tested
at the factory.
