Checking The Co₂ Content; Setting The Co₂ Content; Removing The Gas-Air Mixture Unit - Vaillant ecoFIT sustain 825 Installation And Maintenance Instructions Manual

11.3 Checking the CO₂ content
1. Start up the product with check programme (P.01).
2. Wait until the value that is read is stable.
–
Waiting period for reading a stable value: 5 min
1
3. Unscrew the cover from the flue gas analysis point (1).
4. Measure the CO₂ content at the flue gas analysis point
(1).
5. Compare the measured value with the corresponding
value in the table.
Checking the CO₂ content
Great Britain
front casing on / front casing off
Natural gas
G20
9.2 ±1 %
The value is OK.
◁
The value is not OK; you cannot start up the
▽
product.
Set the CO₂ content. (→ Page 25)
▶
11.4 Setting the CO₂ content
Condition: The CO₂ content must be adjusted
Remove the sticker.
▶
Turn the screw (1) to set the CO₂ content (value with
▶
front casing removed).
To increase the CO₂ content: Turn anti-clockwise
◁
To decrease the CO₂ content: Turn clockwise
◁
Only carry out the adjustment in increments of 1/8 turn
▶
and wait approximately 1 minute after each adjustment
until the value has stabilised.
Compare the measured value with the corresponding
▶
value in the table.
0020230529_04 ecoFIT sustain Installation and maintenance instructions
A
B
Inspection and maintenance 11
Setting the CO₂ value
CO₂ at full load
Set for Wobbe index
W₀
O₂ at full load
CO at full load
CO/CO₂
If the setting is not in the specified adjustment range,
▽
you must not start up the product.
Inform Customer Service.
▶
Check whether the air-quality requirements with regard
▶
to carbon monoxide are fulfilled.
Fit the front panel.
▶
11.5

Removing the gas-air mixture unit

Note
The gas-air mixture unit consists of three main
components:
– Fan
– Gas valve assembly,
– Burner hood
1. Switch off the product via the main switch.
2. Close the gas stopcock.
3. Remove the front casing. (→ Page 9)
1
4. Remove the screw (1).
5. Push the clip upwards.
6. Remove the flue pipe (2).
Great Britain
front casing on / front cas-
ing off
Natural gas
G20
9.2 ±0.2 %
14.09 kW⋅h/m³
4.5 ±1.8 vol. %
≤ 250 ppm
≤ 0.0027
B
2
D
1
A
C
25