Appendix
Sentinel Kinetic MVHR Installation & Commissioning
44
Appendix: Options and Accessories
CO
2
Sensor
An optional wall-mounted CO
2
Sensor (433257) may be used to control airflow. The CO
2
sensor measures the
CO
2
level in ppm (parts per million) and the unit adjusts the fan speed accordingly. When the CO
2
level is below
the lower threshold (adjustable), the fan will run at Normal speed. When the CO
2
level is above the upper
threshold (also adjustable), the fan will run at Boost speed. If the CO
2
level is between the lower and upper
thresholds, the fan will run at a speed between Normal and Boost proportional to the difference between the
CO
2
level and the thresholds.
Normal / Boost Switch
An optional Normal/Boost Switch (455213) may be used to control airflow. Connecting a switch will enable a
manual control to be used in conjunction with other boost controls.
Humidistats
An internal Relative Humidity Sensor PCB (441838) may be used to control airflow. The unit adjusts the fan
speed proportionally depending on the temperature and relative humidity levels in the extracted air whilst
avoiding nuisance tripping at night time when temperatures drop and relative humidity naturally rises. The unit
does not just look for relative humidity levels above a set point, which can be unreliable in products that extract
from multiple rooms, but it also looks for rapid increase in relative humidity typically generated by such activities
as showering or cooking.
Connecting a System Cooker Hood
A system cooker hood that has a Switched Live output to trigger the unit from normal to cooker hood boost can
be connected as follows. The cooker hood must be double insulated.
1. Remove a blind grommet from the Cable Inlet plate
and insert the 3 core cable from Cooker hood.
2. Connect the 3 wires to the terminal block
marked J12
Brown = L
Grey = N
Black = LS
Summary of Contents for Sentinel Kinetic B 438222
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