First start-up
Installation, use and maintenance manual – Caldaia 55.1 and 100.2 Tech
33
5
5.6
GAS CHANGEOVER
Paragraph reserved exclusively to TACs.
The following instructions apply to both the conversion
from natural gas (G20) to any other gas and vice versa.
Check that the gas supply line is suitable for the new fuel
type used to supply the unit.
How to change gas (Figure 5.9
1. Loosen the two screws 1 from the fixing bushing, and re-
move the air intake pipe.
2. Unscrew the pipe connection connecting the gas valve to
the venturi.
3. Unscrew the three fixing screws 2 of the venturi V with a 10
mm wrench.
4. Unscrew the two screws 3 and press on the back side of the
venturi body C.
5. Replace the venturi with the one suitable for the type of gas
to be used and make sure that the orientation of tooth D is
downwards on the aluminium body.
6. Reassemble the components, proceeding in the opposite se-
quence to the disassembly operations, making sure that the
gasket G is reassembled.
7. Set the boiler to operate with the new type of gas, chang-
ing the value of parameter P02 (gas type selection) from the
control panel (Paragraph 5.4
8. Proceed to the adjustment of the CO
2
value, as described in
Paragraph 5.5
9. Replace the sticker indicating the gas type on the appliance
with the sticker for the new gas type.
Figure 5.9
Gas changeover
1
Bushing fixing screw
2
Venturi fastening screws
3
Venturi fastening screws
V
Venturi
G
Gasket
C
Venturi backside
1
2
2
V
2
G
3
3
D
C
C
5.7
COMMISSIONING
1. Remove the boiler front panel (Paragraph 5.2 p. 26).
2. Power the boiler.
Only for Caldaia 55.1 Tech
The ignition system will automatically activate the
system venting cycle function shown in the display
with the code F33, which lasts 2 minutes (except the
first time the appliance is switched on, where the du-
ration is 5 minutes).
When function F33 is active, the pump is activated at in-
tervals and the burner ignition request is disabled. The
regular operation of the boiler is allowed only when the
operation is completed.
3. Make sure that the circulator is not locked.
4. If it is locked, wait for the circulator to perform the automatic
unlocking function (duration 3 minutes).