Baxi Eco 3 Service Manual download pdf (Page 23)

9.0 Commissioning the Boiler

9.2 Checking the Burner Pressure

1. Turn on the gas and electrical supplies to the

boiler and ensure that all external controls are

calling for heat.

2. Set the hot water and central heating

temperature controls to maximum and the selector

switch to the OFF position (Fig. 42).

3. Slacken the pressure test point sealing screw on

the gas valve and connect a pressure gauge (Fig.

43).

4. Disconnect the sensing tube from the gas valve.

5. Turn the selector switch fully anticlockwise

against the spring pressure to the reset p[osition

and hold for 2 seconds to reset the boiler.

6. Turn the selector switch to the Central Heating

and Domestic Hot Water position ( ). The

power ON light ( ) will illuminate (Fig. 42).

7. Turn on a hot water tap to give a flow rate of at

least 10 l/min.

8. The pressure should be as quoted in Section 4.0

Technical Data. If not, check that the gas supply

pressure is correct (Natural Gas 20mbar, Butane

30mbar and Propane 37mbar).

9. The burner pressure can be adjusted if required.

10. Remove the governor cover screw (Fig. 44)

and adjust the pressure regulator screw until the

maximum pressure is achieved.

11. Turn the boiler selector to the Off position and

remove the plug from the NTC sensor.

12. Turn the boiler selector switch to the Central

Heating and Domestic Hot Water position ( )

and reconnect the plug to the NTC. Check and

adjust as required the minimum pressure (Fig. 43).

This must be performed within 25 seconds after

which the boiler resumes normal operation.

13. Disconnect the pressure gauge, tighten the

pressure test screw and replace the sensing tube

on the gas valve.

14. Replace the governor cover screw and set the

selector switch to the position required.

OUT

MIN

Pressure Test Point

Sealing Screw

Governor Cover Screw

Gas Valve

Central Heating

Temperature Control

Hot Water

Temperature Control

Fig. 42

Fig. 43

Fig. 44

bar

Selector Switch

Minimum

Pressure

Screw

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 43 44

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Baxi Eco 3 Service Manual Page 23

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