Carel k.Air, User Manual, Page: 81 / 192

81
Functions k.air +030220981 rel. 1.2 - 01.12.2020
The fi gure shows the modulating fresh air fan confi guration with fl ow-rate control.
30220980_206_R01
ppm
Air quality setp
Fresh air Fan speed
Minimum fresh air
Air flow set
Maximum fresh air
Maximum air flow
Key
Maximum air fl ow Maximum air fl ow-rate or static pressure set point
Minimum fresh air Minimum fresh air damper opening
Maximum fresh air Maximum fresh air damper opening
Air fl ow set Air fl ow-rate or static pressure set point
Fresh air Contribution to the supply of fresh air via the dampers
Fan speed Contribution to the supply of fresh air by increasing fan
speed
Fig. 9.aj
Consequently, air quality control requires the following:
1. Enable a modulating actuator
2. Enable air quality control (with modulating dampers and fans, it only needs to be active on one of the two)
3. Confi gure CO2 probe channel in the IO confi guration menu.
4. Confi gure the PID parameters for dampers and fans (if enabled for air quality control).
5. If the fan with fl ow-rate or pressure control is enabled, set the maximum air quality limit in m3/h or Pa
6. Set the air quality set point in the set point menu.
R if D escription D ev Min Max UoM D ir Modbus BAC net
U N IT
Aa48 Unit setpoints - Air quality - Economy
- Setpoint
800.0 LowLimVal HiLimVal ppm R/W HR1134 AV2644
Unit setpoints - Air quality - Economy
- Low limit value
600.0 AirQuality_
MinVal_RW HiLimVal ppm R/W HR1135 AV2645
Unit setpoints - Air quality - Economy
- High limit value
1000.0 LowLimVal MaxVal_ RW ppm R/W HR1136 AV2646
Aa51 Unit setpoints - Air quality - Pre- comfort - Setpoint 800.0 LowLimVal HiLimVal ppm R/W HR1137 AV2647
Unit setpoints - Air quality - Pre- comfort - Low limit value 600.0 AirQuality_
MinVal_RW HiLimVal ppm R/W HR1138 AV2648
Unit setpoints - Air quality - Pre- comfort - High limit value 1000.0 LowLimVal MaxVal_ RW ppm R/W HR1139 AV2649
Aa54 Scheduler: confi guration - Enabled FALSE 0 1 - R CS064 BV64
Unit setpoints - Air quality - Comfort
- Setpoint
800.0 LowLimVal HiLimVal ppm R/W HR1140 AV2650
Unit setpoints - Air quality - Comfort
- Low limit value
600.0 MinVal_RW HiLimVal ppm R/W HR1141 AV2651
Unit setpoints - Air quality - Comfort
- High limit value
1000.0 LowLimVal MaxVal_ RW ppm R/W HR1142 AV2652
Tab. 9.au
9.20 A uxiliary control
Note:
auxiliary control is available if there is a suffi cient number of free inputs and outputs.
After enabling 1 to 4 auxiliary loops, the following need to be selected for each:
• the input probe, which can be either one of the main probes or a dedicated auxiliary probe;
• the type of output, ON/OFF or modulating;
• whether the function is always active or only when switching on the unit, the fan, or manually controlled;
• the working set point, selected from: independent set point, supply or return temperature set point, humidity set point;
• the PID and confi guration parameters.
Auxiliary control can drive a system actuator or an actuator with direct eff ect on indoor comfort. In the latter case, the set point
is made available via the quick menu on the main screen, after selecting “enable quick menu”. This allows the set point to be
defi ned by the end user with unprotected access.