Malfunction Procedures; How To Gain Access To The Comfonet Connectors On The Unit; How To Gain Access To The Control Pcb - Zehnder Rittling ComfoAir Q Installer Manual

9. Malfunction procedures

Always disconnect the power supply of the unit
before you start working on the unit. The unit
can cause personal injury when it is open while
running. Make sure the unit cannot switch back
on by accident.

9.1 How to gain access to the ComfoNet connectors on the unit

1
Open the semi-transparent visor.

9.2 How to gain access to the control PCB

1
Open the semi-transparent visor.
4
Pull the cable tray cover forwards.
30 - EN
2
Pull the cable tray cover forwards.
2
Unscrew the 3 screws of the front
cover.
5
Unscrew the 2 screws of the display
cover.
Always take ESD-inhibiting measures when
dealing with electronics, such as wearing an
antistatic wristband. The electronics can get
damaged by static charges.
In the chapter what to do in the event of a
malfunction alert (troubleshooting) you can find how
to solve all malfunction codes.
3
1 2 3
1 = ComfoNet plug-in connection
2 = ComfoNet plug-in connection
3 = ComfoNet RJ45 connection
3
Remove the front cover.
6
Open the display cover.