Conversion To Natural Gas E/Ll (G20/G25) - Wolf CGB-75 Assembly And Operating Instructions Manual

The gas condensing boilers CGB-75/CGB-100 are equipped as part of the standard delivery for operation with natural gas H (G20).
For operation with LPG (G31), the gas restrictor must be replaced.
1)
1
2
Unplug the connector   (first undo Phillips head screws)
2)
Undo gas connection at the gas combination valve
3)
Undo the mixing chamber from the ventilator (three Allen
screws 5 mm), and remove air inlet pipe where necessary
Reassemble in reverse order.
Note: if you are converting from LPG to natural gas, the gas combination valve and the flue gas orifice plate must be removed
before assembly (see pages 24/25).
3062555_201507

Conversion to natural gas E/LL (G20/G25)

(if necessary)
4)
5)
6)
4 x screws
SW8
Undo the gas combination valve from the mixing chamber
for gas/air (four SW8 screws).
Gas restrictor
Remove the built-in gas restrictor and replace it by a gas
restrictor designed for the new type of gas (according to
the table on page 25).
O-ring
After assembly of the gas restrictor, gas combination valve
and air inlet pipe, push the O-ring lubricated with silicone
grease into the packing groove of the fan and refit the
mixing chamber.
23