Removing The Gas-Air Mixture Unit; Cleaning The Heat Exchanger - Vaillant ecoFIT pure 825 Installation And Maintenance Instructions Manual

11 Inspection and maintenance
11.6

Removing the gas-air mixture unit

Note
The gas-air mixture unit consists of three main
components:
– Ventilator
– Gas valve,
– Burner cover
1. Switch off the product via the main switch.
2. Close the gas isolator cock.
3. Remove the front casing. (→ Page 10)
D
4. Remove the screw (1).
5. Push the clip upwards.
6. Remove the flue gas pipe (2).
5
4
3
B
7. Remove the air intake pipe (3).
8. Remove the plugs from the gas valve (4) and from the
fan (5).
26
1
A
B
C
2
A
Installation and maintenance instructions ecoFIT pure 0020230531_01
6
D
A
9. Remove the gas-air mixture unit (6).
7
7
8
10. Remove the burner seals (7) and the burner (8).
11. Check the burner and the heat exchanger for damage
and dirt.
12. If necessary, clean or replace the components accord-
ing to the following sections.
13. Install the two new burner seals.
11.7

Cleaning the heat exchanger

1
1. Protect the folded down electronics box against sprayed
water.
2. Clean the ribs of the heat exchanger (1) with water.
◁
The water runs out into the condensate tray.
B
C