EVCO EPK4BHQ1AH Installer manual - Manual (Page 86)

EVCO S.p.A. c-pro 3 NODE kilo AHU | Application manual ver. 1.0
page 86 of 114
WINTER operation/HEATING: Free-Heating
Note: if one of the sensors included in the control is in error the control of the free-cooling/free-heating can no longer
be utilized and the heating/cooling ramp regulate the total control differential.
6.16.5 Air quality control
The outdoor damper may be used to replace the air upon request by the appropriate sensor (VOC/CO2). It is
necessary to enable the parameter PS02=1, and the control sensor for the air quality (PH46>0). The outdoor dampers
can be commanded based on the control sensor at set point (PS20) and at the relative differential (PS21).
Note: If the air quality sensor is in error the control is inhibited. The sensor can be one of three types: 4..20mA
(PH46=1), 0..5V (PH46=2) or 0..10V (PH46=3);
Note: the air quality sensor is always connected on the AI3 remote.
6.16.6 Damper command
The outdoor damper can be utilized for two controls: free-cooling/free-heating and air quality control.
The priority of these requests is decided by parameter PS03:
- PS03=0: The shutter is commanded by Free-cooling / Free-heating
- PS03=1: The shutter is commanded by air quality control
- PS03=2: The shutter is commanded by the largest request
- PS03=3: The damper request is calculated as the arithmetic mean of the two free-cooling (/free-heating)
and air quality control requests. In a way to satisfy both active requests.
-
In order to correctly command the external shutter motor it is necessary to set the following parameters:
- PS05. Minimum position of dampers.
- PS06. Maximum position of dampers.
- PS07. Damper run time to go from 0% to 100%.
- PS08. Maximum time to maintain signal at end of relay.
- PS09 (optional). If greater than zero the command at relay are given only when the actual variation on the
control ramp exceeds the set value. If PS09=0 the command will always pass.
- PS15 The minimum opening of damper can be deactivated (PS15=0), limited only if regulation is active
(PS15=1), or always active (PS15=2).
Set Point
Supply
T. Supply
Pb01
Pb01 /
NZ
Pb03
100 %
0 %
Heating coil
Outdoor air dampers
regulated in free-heating