Setting The Co₂ Content; Removing The Gas-Air Mixture Unit - Vaillant home combi Installation And Maintenance Instructions Manual

11.4 Setting the CO₂ content
Conditions: The CO₂ content must be adjusted
▶
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.
Setting the CO₂ value
Great Britain
Removed front cas-
ing/installed front
casing
Natural gas
G20
9.2 ±0.2 %
CO₂ at full
load
Set for 14.09 kW⋅h/m³
Wobbe
index W₀
4.5 ±1.8 vol. %
O₂ at full
load
≤ 250 ppm
CO at full
load
≤ 0.0027
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.
▶
Install the front casing.
0020224355_00 HOME Installation and maintenance instructions
11.5
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Inspection and maintenance 11

Removing the gas-air mixture unit

Note
The gas-air mixture unit consists of three main
components:
– Ventilator
– Gas valve,
– Burner cover
Switch off the product via the main switch.
Close the gas isolator cock.
C
Push the clip (1) upwards.
Remove the flue pipe (2).
B
Remove the air intake pipe (3).
Remove the plugs from the gas valve (4) and from the
fan (5).
1
A
B
2
A
23