VISION 2PLT
Pag. 22
Rev. 02-18
USE AND MAINTENANCE MANUAL
HOT GAS DEFROSTING
Set parameter d1=1 or d1=2 to manage defrost in cycle inversion mode.
During the entire defrosting process the compressor and defrost relays are activated.
During dripping (d7) the compressor stops and, if d1=2, the defrost relays remain
activated in order to ensure the ignition of the resistances of the basins. If d1=2 it may be
necessary to add external electromechanical components for proper control of the
solenoid valves. For a correct control of the system, the installer must use the defrost
output which must allow the opening of the inversion cycle electrovalve and closing of the
liquid electrovalve. For capillary systems (without thermostatic valve) it is sufficient to
control the inversion cycle electrovalve using the defrost relay command.
OPERATING MODE
The control can operate in four different modes, depending on the value of the mOd
parameter:
mOd = 1. Probe 1 used as regulation probe. The presence of ambient probe 2 is ignored.
If probe 1 fails alarm E1 is signaled and the control enters emergency mode
(CE1 and CE2 parameters);
mOd = 2. Probe 2 used as regulation probe. The presence of ambient probe 1 is ignored.
If probe 2 fails alarm E2 is signaled and the control enters emergency mode
(CE1 and CE2 parameters);
mOd = 3. Probe 1 used as regulation probe, probe 2 used as control probe.
If probe 1 fails alarm E1 is signaled and the ambient probe 2 becomes the
regulation probe. If probe 2 fails alarm E2 is signaled and ambient probe 1
remains the regulation probe.
If both ambient probes fail E1 error is reported and the control enters emergency
mode (CE1 and CE2 parameters).
If the temperature difference between the ambient probes is greater than 5°C for
a time greater than 10 minutes then EdP alarm is signaled.
mOd = 4. Temperature control by considering the average of the values measured by the
1 and 2 ambient probes. If the ambient probe 1 fails, the ambient probe 2 is
considered as the control probe (and vice versa). If both ambient probes fail E1
error is reported and the control enters emergency mode (CE1 and CE2
parameters).
5.19
5.20
CHAP. 5 - Data programming
Содержание 100N MASTER3 2PLT
Страница 2: ...VISION 2PLT Pag 2 Rev 02 18 USE AND MAINTENANCE MANUAL...
Страница 27: ...VISION 2PLT Pag 27 Rev 02 18 USE AND MAINTENANCE MANUAL 100N MASTER3 CONNECTION LAYOUT Attachments A 2...
Страница 30: ...VISION 2PLT Pag 30 Rev 02 18 USE AND MAINTENANCE MANUAL Notes...
Страница 31: ...VISION 2PLT Pag 31 Rev 02 18 USE AND MAINTENANCE MANUAL...
