Main Combi 24 HE Manuel de service télécharger pdf (Page 43)

13.0 Combustion Check

13.1 Checking the CO

1. The combustion (CO

) may be checked using a suitably

calibrated analyser after running the boiler for several

minutes.

2. To do this it is necessary to set the boiler to ‘Calibration

Mode’.

3. Ensure that all external controls are calling for heat. The

actual current boiler temperature is shown on the display.

4. Turn both temperature control knobs fully anticlockwise,

then quickly turn the DHW temperature knob

clockwise

twice and back fully anticlockwise (Fig. 70).

5. The display will now alternate between ‘SF’ and the

current boiler temperature and both green LEDs will flash

(Figs. 71 & 72).

6. Turn the CH temperature knob fully clockwise. As the

knob is turned the display will change, indicating the fan

speed.

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

revert to ‘P ‘ alternating with the current boiler temperature

(Figs 73, 74 & 75).

8. Remove the plug from the flue adaptor test point. Insert

the analyser probe and allow time for the reading to settle

(Fig. 76).

The CO

should be 8.7% ± 0.2

9. It is possible to alter the CO

by adjustment of the gas

valve. Remove the plastic cover from the ‘Max Rate’

adjustment screw. At maximum rate the ‘Max. Rate’

adjustment screw should be turned, using a suitable

hexagon key, until the correct reading is obtained (Fig. 77).

10. The CO

must then be checked at minimum rate. Turn

the CH temperature knob fully anticlockwise. 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 CO

should be 8.4% ± 0.2.

11. With the boiler on minimum, the ‘Min. Rate’ adjustment

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

removing the cap (Fig. 77). If the CO

is reset at either

boiler rate it must be rechecked at the other rate and also

adjusted if required.

12. 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 DHW

knob.

Selector Switch

Display

bar

GRASSLIN

Central Heating

Temperature Control

Domestic Hot Water

Temperature Control

Fig. 71

Fig. 72

Fig. 73

Fig. 74 Fig. 75

Central Heating

Temperature Control

Domestic Hot Water

Temperature Control

Fig. 70

x 2

Fig. 76

Max Rate

Adjustment Screw

(cover removed)

Min Rate

Adjustment Screw

(cap fitted)

Gas Valve

Fig. 77

Flue Adaptor Test

Point

Plug

Analyser Probe

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 55 56

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Main Combi 24 HE Manuel de service Page 43

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