About The Co₂ Sensor - Daikin VAM350J VEB Series User Reference Manual

17 | Configuration
17.5.3 About the CO₂ sensor
Installer and user reference guide
90
X24A outputs a signal when the supply air fan or exhaust air fan is running.
Configure setting 18(28)-3 to 03 or 04.
With the CO (carbon dioxide) sensor installed, you can adjust the ventilation
2
volume in function of measured CO
value is compared to programmed trigger values. Make sure that the ventilation
mode and air flow rate are set to automatic.
See "17.2 Field settings" [
▪ Use setting 19(29)‑9‑05 to give control to the CO
▪ Use setting 19(29)‑7 to shift the trigger values.
▪ Use setting 18(28)‑6 to switch between linear and fixed control.
▪ Use setting 18(28)-4 for onsite setting.
Linear control
Initialising 20 minutes in high
Measuring Every 5 minutes
Evaluation Every 30 minutes (average of
6 measurements)
Trigger value
(a) UH
CO₂ ppm
≥1450 30
1300~1450 20
1150~1300 10
1000~1150 —
(e)
850~1000 —
700~850 —
550~700 —
400~550 —
(a)
CO₂ parts per million
(b)
Ultra High
(c)
High
(d)
Low
(e)
1000: base concentration
Example
When the sensor measures 900 ppm in linear control, the unit runs in high mode
for 20 minutes and the next 10 minutes in low mode, then measures again.
L-tap
L-tap is adopted in case of:
▪ EKVDX connection
▪ direct duct
Essential wiring
See "15.2 Opening the switch
delivered with the CO
2
concentration. The measured concentration
2
4
72] for the field setting overview.
Linear control (minutes)
(b) (c) (d)
H L
— —
10 —
20 —
30 —
20 10
10 20
— 30
— 20
4
box" [ 54] and the installation manual that is
sensor.
sensor.
2
Fixed control
20 minutes in high
Every 20 minutes
Every 20 minutes
Fixed control
Stop Tap A
— UH
— UH
— H
— H
— H
— L
— L
10 L
VAM350~2000J*VEB*
Heat reclaim ventilation unit
4P664012-1A – 2024.01
Tap B
UH
UH
H
H
L
L
L
stop