Chaffoteaux MIRA SYSTEM 24 CF [11/20] Gas conversion

When changing to a gas different from the one for which the boiler is equipped, you should replace the parts supplied with the

conversion kit and adjust the gas valve in accordance with the method described below.

Adjusting the nominal output

• remove the protective cap from the adjusting

screws (fig. 16).

• remove screw 2 and fit a tube connected to a

pressure gauge to the pressure connection point

(fig. 16).

• start the boiler at maximum output (hot water tap

on full) and maximum temperature setting.

• turn nut 3 using an 8-mm open-ended spanner

(fig. 17) while holding screw 4 still and adjust the

pressure to the value shown in the table

“nominal output table.”

Adjusting the minimum output

• disconnect a variable solenoid valve power

supply cable (fig. 18)

• turn screw 4 using a 5-mm open-ended spanner

while holding nut 3 (fig. 18) and adjust the

pressure to the value shown in the table

“minimum output table.”

• when the adjustment is finished, refit screw 2

and test for leaks.

• put the protective cap back on the adjustment

screws.

Fig.16

Fig.17

Fig.18

Nominal output

Minimum output

mm CE G 20 G 30 G 31

24 kW CF 133 270 355

mm CE G 20 G 30 G 31

24 kW CF 16 38 49

9. Gas conversion