ef cooling Ernst H. Furrer AG Operating manual
2-10 Chapter page Issue: 07 / 2015 Cooling unit EVO 45, 0390.013
2.12.2 Refrigerant circuit
The refrigerant circuit is equipped with the following safety devices:
Low-pressure transmitter (ND)
The low-pressure transmitter monitors the suction side against impermissibly low operating
pressure in the refrigerant circuit. If there is a malfunction, the controller switches the
compressor off and signals this on the display. Cooling is switched back on after the alarm on
the display has been acknowledged. When the device is switched on again, the alarm is
delayed.
(See also Chap. 7.1.3 Troubleshooting at operator level and 9.4 Troubleshooting at repair
level).
High-pressure transmitter (HD)
The high-pressure transmitter monitors the pressure side against impermissibly high operating
pressure in the refrigerant circuit. If there is a malfunction, the controller switches the
compressor off and signals this on the display. Cooling is switched back on when the refrigerant
circuit has cooled sufficiently and the alarm on the display has been acknowledged.
(See also Chap. 7.1.3 Troubleshooting at operator level and 9.4 Troubleshooting at repair
level).
High-pressure safety pressure switch (HDS)
The high-pressure safety pressure switch protects the pressure side against impermissibly high
operating pressure in the refrigerant circuit. If there is a malfunction, the high-pressure safety
pressure switch turns off the compressor and signals the malfunction on the display. Cooling is
switched back on when the refrigerant circuit has cooled sufficiently and the alarm on the
display has been acknowledged.
(See also Chap. 7.1.3 Troubleshooting at operator level and 9.4 Troubleshooting at repair
level).
2.12.3 Medium circuit
The medium circuit is equipped with the following safety devices:
Flow meter
The flow meter monitors the evaporator for impermissibly low flow-through, i.e. for freezing due
to low flow speed.
The flow meter also protects the pump against running dry. If there is a malfunction, the
controller switches off the pump (as well as the cooling) and shows the malfunction on the
display. Cooling is switched back on after the alarm on the display has been acknowledged.
(See also Chap. 7.1.3 Troubleshooting at operator level and 9.4 Troubleshooting at repair
level).
Evaporator outlet sensor
The evaporator outlet sensor monitors the evaporator for impermissibly low outlet temperature
of the water. If there is a malfunction, the controller switches the compressor off. This is shown
on the display. Cooling is switched back on after the alarm on the display has been
acknowledged.
(See also Chap. 7.1.3 Troubleshooting at operator level and 9.4 Troubleshooting at repair
level).
To Next Page
Loading...