EGK 2A Ex
8.3 Checking/Resetting Pressure Monitoring Switches
– Observe the warnings under Maintenance.
– Switch off the cooler power supply and secure against restarting.
– Remove the cover for the pressure controls, between the cooling block and electronics hous-
ing.
– Remove cover. To do so unscrew the two screws beneath, carefully pull the lower section for-
ward and slide the cover up. You will now see the two pressure controls.
– Wait approx. 3 minutes after switching off the pressure controls before testing.
– Very carefully press the face of the green button n the upper pressure control. If you feel a click, the pressure control had
been triggered. Do the same with the lower pressure control. The actual cause for the trigger must be analysed (for assist-
ance see chapter Troubleshooting).
– If neither of the two pressure controls were triggered or the pressure controls cannot be reset,
do not restart the cooler
but
send it in for repair.
– Attach the cover and secure at a tightening torque of 1.85 Nm.
– The power supply can now be switched on again and the cooler restarted per chapter
8.4 Press switches respond during initial start-up
DANGER
Explosion hazard
The following description does
not
apply if the pressure controls
on the cooler
are
triggered
within the first minute. In this case there is a serious malfunction, resulting in
a potential explosion hazard!
After transport in some cases more coolant can be dissolve in the compressor oil than required to safely operate the refrigerant
circuit. After startup the cooler will then suddenly enter error mode (flashing red) after a few minutes.
In this case reset the pressure control(s) according to chapter Checking / resetting the pressure monitor switch and start the
cooler. This may be required up to three times before the refrigerant circuit and particularly the compressor have warmed up
sufficiently for n adequate amount of coolant to be in the circuit.
8.5 Checking the Starting Capacitor
Replacing the starting capacitor
[> page 22]. Ensure the capacitor is discharged before testing!
– Check the capacity of the capacitor, which should be 55 µF.
– Test the internal resistance of the capacitor, which should be 200 kR.
26
Bühler Technologies GmbH
BE450020 ◦ 01/2020
