20 - EN
4 Maintenance procedures
Observe all maintenance instructions given in this
section and in the user manual. If the maintenance
is not performed periodically the performance of the
ventilation system will ultimately be compromised.
In the user manual you can find all the maintenance
work that the user may carry out.
You can find the maintenance procedures for the
accessories connected to the unit in the respective
manuals. You can obtain a copy of the Zehnder manual
from Zehnder.
When you need to replace a part, you can order a
service part from Zehnder. In the section about service
parts, you can see which service sets are available.
Always disconnect the power supply of
the unit before you start working on the
ventilation system. Operation with the
casing open can lead to personal injury. In
such a case, ensure that no live or rotating
parts can be touched.
The electronics can be damaged by static charging,
so always take measures to prevent electrostatic
discharge (e.g. antistatic belt) when handling the
electronics.
Zehnder recommends hiring
a specialist cleaning company
to clean the entire ventilation system
4.1 Procedure for opening the unit
1
2
Do not yet switch off the power to the
unit. The current setting of the bypass
valve may mean you cannot remove the
heat exchanger from the unit.
Switch off the child lock on the display of the
unit:
■
Press the display of the unit for about 4
seconds until the symbol
MENU
disappears.
Set the unit to SERVICE MODE. (MENU> Login>
SERVICE MODE> ACTIVATE)
3
4
5
Disconnect the power to the unit when the
display tells you to.
Remove the 3 screws from the front cover.
Remove the front cover.
Unplug the unit from the wall outlet to disconnect it from the power supply.
If the unit does not have a plug, use a switch according to EN 60335-1 (with switch-off
of all poles and 3 mm overvoltage category III).
10001047667-0619-zw-zw-A4 ComfoAir E 350 GEN2 Service Zehnder-SI_EN.indd 20
11-07-19 13:31
