4 free-cooling and free-heating regulation – EVCO c-pro kilo AHU User Manual

Page 68

C-PRO KILO AHU APPLICATION MANUAL

Pag. 68

6.11.4 Free-Cooling and Free-Heating Regulation

The regulation of the free-cooling/free-heating commands the opening of the external air
shutter. When free-cooling/free-heating conditions exist; or if the regulation can be enabled
(and the request is greater than zero) the ramps which command the heating/cooling are split
into two successive ramps, the first (half the differential) regulates the free-cooling/free-
heating using the external air shutter, the second regulates the heating/cooling valves.

SUMMER operation/COOLING: Free-Cooling

WINTER operation/HEATING: Free-Heating

Note. If one of the probes included in the regulation is in error the regulation of the free-
cooling/free-heating can no longer be utilized and the heating/cooling ramp regulate the total
regulation differential.

Set Point

Delivery

T. Delivery

Pb01

Pb01 / 2

Neutral
Zone

100 %

0 %

Cooling coil

External air shutter
regulated in free-cooling