Inspecting And Cleaning The Preheater Element Fi Lter; Malfunctions - Zehnder ComfoAir 550 Installationsanleitung

menu P76.
Fasten the screws to a maximum of 1.5 Nm.
This is roughly equal to speed 2 of an aver-
age battery-powered drill.
2.9.3 Inspecting and cleaning the preheater
element fi lter
Clean the fi lter of the Preheater (if fi tted)
once every 4 years.
1. Remove the heat exchanger as instructed in
the maintenance chapter of the heat exchang-
er.
2. Remove the screw from the electronics car-
riage.
3. Pull the electronics carriage carefully forwards.
4. Release the connectors (J) and the earth wire
on the control circuit board panel and fully re-
move the cables including the two grommets
(K).
5. Remove the cable (P) from the control circuit
board panel.
6. Remove the Pre-heater holder by sliding it up
halfway and then pulling it away from the valve.
7. Remove the Pre-heater fi lter located behind the
Pre-heater holder.
8. Inspecting and if necessary clean the preheater
element fi lter.
- Clean the fi lter with a brush.
- Remove any deposit using a damp cloth.
9. Install all parts in reverse order.
10. Reconnect the power to the ComfoAir.
The hollow side of the Pre-heater fi lter must
face the Pre-heater holder.
Fasten the screws to a maximum of 1.5 Nm.
This is roughly equal to speed 2 of an aver-
age battery-powered drill.
11. Carry out the self-test in accordance with
menu P76.

2.10 Malfunctions

Malfunctions in the ComfoAir are reported as fol-
lows:
• The malfunction alert appears on the display.
• The malfunction indicator on the 3-position
switch lights up;
Malfunction alerts may not appear on the digital
operating device in all cases, even though there is
a malfunction (or problem). A concise explanation
of both types of malfunction (or problem) is given in
the paragraphs below.
2.10.1 Malfunction alerts on the digital
operating device
In the event of a malfunction, the corresponding
malfunction code will be displayed on the digital
operating device of the ComfoAir.
Below is a list of the malfunction alerts on the digital
operating device.
In the chapter about trouble shooting is explained
how to solve these malfunctions
Code Description
A0 N/A
A1 NTC sensor T1 is defective.
(= outside air temperature)
A2 NTC sensor T2 is defective.
(= supply air temperature)
A3 NTC sensor T3 is defective.
( =return air temperature)
A4 NTC sensor T4 is defective.
(= exhaust air temperature)
A5 Malfunction in the bypass motor.
A6 Malfunction in the
Preheater element motor.
A7 Preheater element does not heat
suffi ciently.
A8 Preheater element becomes too
hot
E1 Exhaust fan not rotating.
E2 Supply fan not rotating.
EA2 No communication between the
enthalpy sensor and the ComfoAir.
,Fil' ,tEr' Internal Filter is dirty.
17 - EN