Baxi Potterton LPG Service Manual download pdf (Page 33)

11.0 Commissioning

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 37mb.

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 Calibration Control knob

clockwise

twice and back fully anticlockwise (Fig. 53).

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

current boiler temperature and both green LEDs will flash

(Figs. 54 & 55).

7. Turn CH temperature control knob fully clockwise. As the

knob is turned the display will change from ‘0’ to ‘00’ (Fig. 58)

indicating maximum rate, then revert to ‘P’ alternating with

the current boiler temperature (Figs 57 & 58).

8. A gas rate measurement may now be taken. The

approximate value is:-

24 model 1.92 kg/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

Calibration Control knob.

Selector Switch

Display

Reset

bar

Central Heating

Temperature Control

Calibration Control

Fig. 54

Fig. 55

Fig. 56

Fig. 57

Fig. 58

Central Heating

Temperature Control

Calibration

Control

Fig. 53

x 2

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 55 56

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Baxi Potterton LPG Service Manual Page 33

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