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35
11.0 Commissioning
© Baxi Heating UK Ltd 2008
11.2 Checking
1. The gas valve is factory set and the burner pressure cannot
be measured as it is altered by suction of the fan and
modulates as demand on the boiler alters. The gas supply
pressure should be 20mb.
2. If necessary the gas rate may be checked after running the
boiler for 10 minutes with any other appliances and pilot
lights turned off.
3. Ensure that the integral timer and any external controls are
calling for heat, and the selector switch is in the central
heating and hot water position ( ). The current boiler
temperature is shown on the display.
4. To check the gas rate it is necessary to set the boiler to
‘Calibration Mode’.
5. Turn both temperature control knobs fully anticlockwise,
then quickly turn the DHW temperature knob
1
/
4
clockwise
twice and back fully anticlockwise (Fig. 66).
6. The display will now alternate between ‘SF’ and the
current boiler temperature and both green LEDs will flash
(Figs. 67 & 68).
7. Turn CH temperature control knob fully clockwise. As the
knob is turned the display will change from ‘0’ to ‘00’ (Fig. 69)
indicating maximum rate, then revert to ‘P’ alternating with
the current boiler temperature (Figs 70 & 71).
8. A gas rate measurement may now be made. Approximate
values are:-
24 model 2.6m
3
/h
28 model 3.1m
3
/h
33 model 3.6 m
3
/h
9. The ‘Calibration Function’ is active for 20 minutes unless
the maximum CH temperature is exceeded.
10. The function can be disabled at any time by turning the
DHW temperature knob.
Selector Switch
Display
Reset
1
2
3
4
5
P
M
7
8
9
10
11
12
1
2
3
4
5
AM
7
8
9
1
0
11
12
0
bar
0
2
3
4
Central Heating
Temperature Control
Domestic Hot Water
Temperature Control
Fig. 67
Fig. 68
Fig. 69
Fig. 70
Fig. 71
Central Heating
Temperature Control
Domestic Hot Water
Temperature Control
Fig. 66
x 2