Carel µC2SE User Manual page 61

D1: defrost signal circuit 1
When the defrost is on circuit 1, the display shows the message D1.
D2: defrost signal circuit 2
When the defrost is on circuit 2, the display shows the message D2.
Fd: dirty fi lter warning
This warning is only shown if the temperature difference between the exchanger inlet and outlet is higher
than parameter A12.
Driver
All the driver alarms on the µC 2 SE that stop the unit feature automatic reset. Consequently, the possibility
to select the automatic resetting of the entire system must be selected for the drivers by setting the
corresponding parameters. The µC 2 SE can send the Go Ahead command according to the normal
procedure for resetting the alarms from the keypad.
Ed1: tLan communication error with Driver 1
The alarm is generated after a fi xed time (5 s) from when the µC 2 SE loses contact with Driver 1. In this
case, circuit 1 is disabled for safety reasons.
Ed2: tLan communication error with Driver 2 (expansion card)
As for Ed1, but relating to driver 2.
SH1: low superheat alarm circuit 1
The low superheat alarm for circuit 1, after a fi xed time (5 s), inhibits the circuit 1 for safety reasons.
The risk is that the compressors will fl ood.
SH2: low superheat alarm circuit 2
As for SH1, but relating to driver 2
nO1: MOP warning (maximum operating pressure) circuit 1
The warning appears on the display and, if the expansion card is fi tted, the corresponding relay is activated.
nO2: MOP warning (maximum operating pressure) circuit 2
The warning appears on the display and, if the expansion card is fi tted, the corresponding relay is
activated.
LO1: LOP warning (lowest operating pressure) circuit
The warning appears on the display and, if the expansion card is fi tted, the corresponding relay is
activated.
LO2: LOP warning (lowest operating pressure) circuit 2
As for LO1, but relating to driver 2
HA1: high evaporator temperature warning circuit 1
The warning appears on the display and, if the expansion card is fi tted, the corresponding relay is activated.
HA2: high evaporator temperature warning circuit 2
As for HA1, but relating to driver 2.
EP1: EEPROM error driver 1
The circuit 1 is disabled for safety reasons, as the status of Driver 1 is not known.
EP2: EEPROM error driver 2
As for EP1, but relating to driver 2.
ES1: probe error driver 1
The circuit 1 is disabled for safety reasons, as the status of Driver 1 is not known.
ES2: probe error driver 2
As for ES1, but relating to driver 2.
EU1: EVD 1 error, valve open when starting
2
If when starting the system the Driver detects that the valve is still open, an alarm is sent to the µC SE that
stops the compressors and the fans in the corresponding circuit.
EU2: EVD 2 error, valve open when starting
As for EU1, but relating to EVD 2.
Eb1: EVD 1 battery alarm
The EVD 1 battery alarm stops the compressors from starting so as to prevent the risk of liquid returning
to circuit 1, and disables the corresponding fans.
Eb2: EVD 2 battery alarm
The EVD 2 battery alarm stops the compressors from starting so as to avoid the risk of liquid returning to
circuit 2, and disables the corresponding fans.
µC 2 SE - +030220426 - rel. 2.0 - 03.08.2009 61