EVCO EPK4BHQ1AH Installer manual - Manual (Page 85)

EVCO S.p.A. c-pro 3 NODE kilo AHU | Application manual ver. 1.0
page 85 of 114
6.16.3 Enabling Free-Cooling / Free-Heating in temperature
The free-cooling in temperature, if enabled (PS01=1), can be activated when the difference between the room air
temperature and the outdoor air temperature reaches the Set point which has been set (parameter PS13) and relative
hysteresis (parameter PS12).
The free-cooling in temperature, if enabled (PS01=1), can be activated when the difference between the room air
temperature and the outdoor air temperature reaches the Set point which has been set (parameter PS13) and relative
hysteresis (parameter PS12).
Note: it is necessary to enable the utilization of the outdoor air temperature sensor (PH40=1). If the sensor is in error
the control is disabled.
6.16.4 Free-Cooling and Free-Heating Control
The control of the free-cooling/free-heating commands the opening of the outdoor air shutter.
When free-cooling/free-heating conditions exist; or if the control 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 outdoor air shutter, the second regulates the heating/cooling valves.
SUMMER operation/COOLING: Free-Cooling
PS12:
T. Room – T. T. Outdoor – T.
PS13:SetF
PS12:
PS13:SetF
Enable Free-Cooling in temperature Enable Free-Heating in temperature
Set Point
Supply
T. Supply
Pb01
Pb01 /
NY
Pb03
100 %
0 %
Cooling coil
Outdoor air dampers
regulated in free-cooling