x 2

Central Heating

 

Domestic Hot Water

Temperature Control

Fig. 102

Temperature Control

Selector Switch

Display

 

 

 

Reset

 

 

 

2

 

 

1

 

 

 

 

3

 

 

 

0

4

 

 

 

 

bar

 

Central Heating

Domestic Hot Water

Temperature Control

Temperature Control

Fig. 103

Fig. 104

Fig. 105

Fig. 106

Fig. 107

Flue Adaptor Test

15.0Setting the Gas Valve

15.1Setting the Gas Valve (CO2 check)

IMPORTANT: The CO2 must be only be checked and adjusted to set the valve if a suitable calibrated combustion analyser is available, operated by a competent person - see Section 13.1

1.

The combustion (CO2) may be checked after running the

boiler for several minutes. To do this it is necessary to set

the boiler to ‘Calibration Mode’.

2.

Ensure that all external controls are calling for heat. The

actual current boiler temperature is shown on the display.

3.

Turn both control knobs fully anticlockwise, then quickly

turn the right hand knob 1/4 clockwise twice and back fully

anticlockwise (Fig. 102).

4.

The display will now alternate between ‘SF’ and the

current boiler temperature and both green LEDs will flash

(Figs. 103 & 104).

5.

Turn the left hand knob fully clockwise. As the knob is

turned the display will change, indicating the fan speed.

6.

The display will show ‘00’, indicating maximum rate, then

revert to ‘P ‘ alternating with the current boiler temperature

(Figs. 105, 106 & 107).

7.

Remove the plug from the flue sampling test point. Insert

the analyser probe and allow sufficient time for the reading

to settle (Fig. 108).

 

The CO2 should be 8.7% ± 0.2

Plug

Point

8. It is possible to alter the CO2 by adjustment of the gas

valve. Remove the plastic cover from the Throttle

Adjustment Screw. At maximum rate the Throttle

Analyser Probe

Fig. 108

Offset

 

Adjustment Screw

Throttle

(cap fitted)

Adjustment Screw

 

 

(cover removed)

Adjustment Screw should be turned, using a suitable

hexagon key, until the correct reading is obtained (Fig. 109).

Turning clockwise will reduce the CO2. Anticlockwise will

increase the CO2.

9. The CO2 must then be checked at minimum rate. Turn

the left hand knob fully anti-clockwise. As the knob is turned

the display will change, indicating the fan speed. When the

display reads ‘ 0’ the boiler runs at minimum rate.

The CO2 should be 8.4% ± 0.2

10. With the boiler on minimum, the Offset Adjustment

Screw must be altered, using a suitable hexagon key, after

Reduce CO2

Increase CO2

at min. rate

at min. rate

If the CO2 is reset at minimum rate it must be rechecked at maximum rate again and adjusted if required. If the CO2 is reset at maximum rate it must be rechecked at minimum rate and adjusted if required.

 

Reduce CO2

Increase CO2

 

at max. rate

at max. rate

Gas Valve

Fig. 109

 

Do not turn the adjustment screws more than 1/8 of a turn at a time. Allow the analyser reading to settle before any further adjustment

removing the cap (Fig. 109). Turning anti-clockwise will

reduce the CO2. Clockwise will increase the CO2.

11. The ‘Calibration Function’ is maintained for 20 minutes

unless the maximum CH temperature is exceeded. The

function can be disabled at any time by turning the right

hand knob.

12. Check the Combustion Performance (CO/CO2 ratio).

This must be less than 0.004.

48© Baxi Heating UK Ltd 2012

Page 48
Image 48
Baxi Potterton Condensing Combination Boiler manual Setting the Gas Valve CO2 check

Condensing Combination Boiler specifications

The Baxi Potterton Condensing Combination Boiler is a sophisticated heating solution designed to meet the demands of modern households while promoting energy efficiency. This state-of-the-art boiler combines both heating and hot water capabilities into a compact unit, making it an ideal choice for homes with limited space.

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