!
USER MANUAL – Release 1.2 of 01/01/2010
Page 131 of 191
Version: 02/03/2010
PHASE 4
: defrost
This phase must always be performed
In this phase:
!
If dF23=0 the condensation fans are always off
!
If dF23=1 the condensation fans start if the condensation pressure/temperature > dF24 and their normal
regulation follows with the cooling set. WARNING, EVEN IF THE EVAPORATION PRESSURE PROBES
ARE CONFIGURED, IN THIS WORKING PHASE THE FANS ARE ALWAYS REGULATED IN
COOLING AND IN HEATING MODE BY THE CONDENSATION PROBES
This phase must have duration of at least the time dF04 and may end
1. If dF01=1
!
If the circuit n° 1 combined defrost NTC temperature is greater than dF14
!
If the circuit n° 2 combined defrost NTC temperature is greater than dF15
!
If the circuit n° 3 combined defrost NTC temperature is greater than dF16
!
If the circuit n° 4 combined defrost NTC temperature is greater than dF17
!
Otherwise when the temperature/pressure detected by the probe/s configured in dF28 exceeds
dF03
2. If dF01=2, the maximum defrost time is reached equal to dF05. Then go to phase 5
3. If dF01=3, if ID configured as defrost end is deactivated. Then go to phase 5
PHASE 5
: management of the reverse valve
This phase must always be performed
1. All compressors and/or partialisations present in the unit are switched off (the compressor/s LED flashes
during this phase)
2. If dF23=2 and the external air probe is configured. The condensation fans start at maximum speed if the
pressure/temperature > dF25
3. If dF23=2 and the external air valve is not configured, the condensation fans start at top-speed
4. Wait for a time equal to dF08/2
5. Deactivate the reverse valve
6. Wait for a time equal to dF08/2
7. The fans are switched-off. From this moment all regulators re-start all normal regulation procedures in
heating mode.
If dF08=0 the valve is turned without any compressor block
The following phases must be performed in sequence to start a manual defrost cycle:
PHASE 6
: manual start-up
!
Press the SET + UP key for 5 sec
!
The unit must be in heating mode
!
If CF02
!
1 and if the condensation/evaporation control probe is not in error conditions,
!
At least one compressor running
If these conditions are present, all previous phases from 3 to 5 can be carried out. Otherwise there will be no
effect by pressing the key.
WARNING: An ACF1 configuration error is generated if the dF26 and dF27 parameters assume values that
are not accepted, see table
dF27=0
dF27=1
dF27=2
dF26=0
YES
not possible (ACF1)
not possible (ACF1)
dF26=1
YES
YES
YES
dF26=2
not possible (ACF1)
YES
not possible (ACF1)
FOR UNIT WITH
UNIQUE
CONDENSATION, dF26 / dF27 MUST BE SET DIFFERENT TO 0
WARNING, IT IS NOT POSSIBLE TO MODIFY THE PARAMETERS OF THE DF MENU WHEN DEFROST
IS ACTIVE IN A CIRCUIT
