Configuration Manual

Version Document
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001
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ccess V4.X Configuration manual
30 (56) 2018-07-11
In applications with varying occupancy the fan speeds or mixing dampers can be
controlled by the air quality as measured by a CO2 sensor.
With the CO2 function it’s possible to start and stop the fans, compensate the fan
speed and in combination with mixing damper let in more outdoor air depending
on the CO2 value.This can be configured with the CO2 control setting:
 Off
 Start/stop function (with fan speed compensation)
 Mixing damper function (with fan speed compensation)
 Both start/stop and mixing damper function (with fan speed compensation)
When the function is activated with start/stop function and the CO2 value rises
above settable start value (default: 800ppm) the fans will start at configured speed
(default: reduced speed), if they are not already running. Should the CO2 value
continue to rise, the fan speed can increase if compensation with CO2 value is
configured (see function “Extra comp 1 curve pressure/flow setpoint”). The fans
will stop when the CO2 value falls to a settable hysteresis (default: 160 ppm)
below the start value.
If demand controlled ventilation is activated in combination with mixing dampers,
and the CO2-value rises above the setpoint value the dampers or exchanger
controlled by a sequence with CO2 function will be overtaken by the CO2
controller and let in more outdoor air. The function is controlled by a PI-controller.
The function has a settable minimum running time.
Configure: Configuration > Function Configuration > CO2 Control
Run exhaust air fan when active
 No
 Yes
Supply air fan mode
 Low speed
 Normal speed
 High speed
Exhaust air fan mode
 Low speed
 Normal speed
 High speed
Operation settings: Data & Settings > Demand Control > CO2 Control
In buildings with strongly varying occupancy the fan speeds or mixing dampers
can be controlled by the air quality measured by a CO
2
sensor.
If demand controlled ventilation is activated in combination with mixing dampers,
and the CO
2
-value rises above the setpoint value, the dampers will let in more
outdoor air. The function is controlled by a PID-controller. Default: P-band 100ppm
and I-time 100 seconds. CO
2
control can be used on a damper sequence,
“Recirculation 1” and “Recirculation 2”.
Free cooling
Activate: Configuration > Function Configuration > Function Activation
 No