Technical data

4000123924-2

Diagram 16.1

9718

Bypass

The boiler has a built-in bypass, refer to diagram 16.1.

The boiler is supplied with the bypass open half a turn. It should

not be necessary to adjust the bypass, but if required ensure

that under no circumstances does the flow rate fall below the

figures specified, refer to table 1. in section 3 (turn clockwise

'A' to close the valve).

F30E/F35E shown

Should it be necessary to change the gas type, a conversion kit

with instructions will be required.

This modification must only be carried out by a competent

person.

Conversion natural gas (G20) to G30/G31 :

Part No. A2011700 for F 30 E and F 30 E SB.

Part No. A2031900 for F 35E.

Setting the step pressure.

Adjusting the step pressure may be a necessary operation after

gas conversion or after changing the gas control valve when a

new replacement part is required.

Proceed as follows:

15 Changing Gas Type

• Gain access to the gas control valve, connect a pressure

gauge.

• Unclip the control box, see diagram 13.3.

• Run the appliance in heating mode.

• Read the burner pressure setting in heating mode, before the

boiler modulates.

• Adjust the central heating output to the minimum setting by

adjusting potentiometer P3, refer to commissioning section.

• Adjust the potentiometer P6 burner pressure to the desired

value, by inserting a small flat edge screw driver into the

arrowed slot, turn to adjust to the desired setting, see diagram

14.2.

• Return the potentiometer P3 to its initial value.

16 Bypass Settings