33
CO
2
sensor
You can purchase a CO
2
-sensor as an accessory if you want to control the fan speed level in accordance with the CO
2
level in the dwel-
ling.
The T3 sensor is factory installed ( in the exhaust).
The CO2 sensor in the unit:
1. Remove the T4 sensor in the counterflow heat exchan-
ger.
2. Remove the counterflow heat exchanger by pulling the
strap (do not cut).
3. Pierce a hole into the foam over the crossbar, (where the
counterflow heat exchanger is positioned) to gain access to
the recess in the top cover.
4. Run the wire from the CO
2
sensor through this recess.
5. Mount the CO
2
sensor in the top cover, using self-threa-
ding screws (included in the CO
2
sensor kit).
6. Run the wire from the CO
2
sensor through the cable
grommet to the automation.
Wire is subsequently tied up with cable strips.