!
USER MANUAL – Release 1.2 of 01/01/2010
Page 92 of 191
Version: 02/03/2010
AUTOMATIC WORKING SELECTION IN COOLING-HEATING MODE FROM DIGITAL INPUT
Par. SP07 = 1
The switch-on selection of a unit configured for cooling and heating takes place from digital inputs configured
as remote Heat/Cool request.
•
The selection is enabled if a digital input is configured as cooling request or as heating request). If no
digital input has been configured, the unit
REMAINS in stand - by
•
the cooling/heating selection from the keyboard is disabled. The unit can only be switched-on/off in the
working status selected from the digital input
AUTOMATIC WORKING SELECTION IN COOLING-HEATING MODE FROM ANALOGUE INPUT
Par. SP07 = 2
Selection from analogue input (change over function) has priority with respect to the digital input. For
temperature of the external air included in the SP09 differential, it is allowed to change the working mode
from the keyboard.
Both with SP07 = 1 and SP07=2, if the unit is in cooling or heating mode and a change of working mode is
requested, the controller switches all outputs off, it waits for a fixed delay time, which is signalled by flashing
of the cooling LED or the heating LED. The flashing indicates the working state in which the unit will be
switched back on respecting the compressors protection times.
17.4 CHANGE OVER FUNCTION
The status change over can only take place if these necessary conditions are present at the same time,
otherwise the unit
REMAINS in stand - by:
1. CF02=3 (cooling/heating selected)
2. SP07=2 is an NTC probe configured as an external air temperature dynamic set point/ boiler
function/change over NTC probe
3. the regulation probe selected must not be in error conditions
AUTOMATIC CHANGE OVER REGULATOR GRAPHICS
Parameters that regulated the change over function
SP08
Allows to set the change over set point. If the selection of the working mode from analogue input is
enabled, it represents the temperature value detected by the regulation probe below which the device
imposes the working in heating mode
SP09
Allows to set the change over differential. If the selection of the working mode from analogue input is
enabled, it represents the temperature differential on the basis of which the device imposes the working in
cooling mode
For temperature of the external air included in the SP09 differential, it is allowed to change the working mode
from the keyboard.
