52/160
AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – [email protected] – www.industrietechnik.it
172
: proportional band for free cooling/heating
In order to have the free heating conditions ON, the following 4 conditions must be checked
Text <=
176
Treg <=
177
(Text - Treg) <
173
(Text - Treg) >
171
If (Text - Treg) <=
171
-
172
now the free heating conditions are OFF.
If damper used is on/off regulated type (
010
=1) or modulated type(
010
=3), when conditions of free cooling/heating are present
and there is a cooling/heating request, the request is divided on 2 bands. The first band regulates the dampers by free cooling/
heating, the second band the cooling/heating battery(ies)
The presence of cooling battery during free cooling or the presence of heating battery during free heating is mandatory, oth
-
erwise damper remains on minimum opening position and is not regulated.
If damper used is on/off bypass for heat exchanger type (
010
=2) or modulated bypass for heat exchanger type(
010
=4), when
conditions of free cooling/heating are present and there is a cooling/heating request, the request is divided on 2 bands. The
first band regulates the dampers by free cooling/heating, the second band the cooling/heating battery(ies).
If cooling battery is not present during free cooling or if heating battery is not present during free heating, the damper is regu
-
lated in any case during cooling/heating request.
if the damper used is bypass for heat exchanger (based only on free heating/cooling,
010
=5), the damper is regulated based
on free cooling/heating regardless of cooling/heating request and of the presence of heating/cooling battery(ies).
During regulation of damper on free heating icon is switched on and icon
flashes.
During regulation of damper on free cooling icon
is switched on and icon
flashes.
Note: If the frost protection alarm occurs, if the appliance is switched off, if the room sensor or external sensor is broken, free
cooling/heating is disabled.
In case of regulation on supply sensor without considering room sensor, free cooling/heating is disabled. A 1-speed on/off fan
or a fan with several on/off speeds or a supply modulating fan must be present.