Immergas MYTHOS HP - Gas Valve Calibration

50
INSTALLER
USERMAINTENANCE TECHNICIAN
TECHNICAL DATA
3.7 CONVERTING THE BOILER TO OTHER
TYPES OF GAS.
e gas conversion operation must be carried out by an
authorised company (e.g. Authorised Technical Assi-
stance Service).
If the appliance needs to be converted to a dierent gas type to that
specied on the data plate, request the relative conversion kit for
quick and easy conversion.
To convert to another type of gas the following operations are re-
quired:
- disconnect power to the appliance;
- replace the main burner injectors, making sure to insert the
special seal rings supplied in the kit, between the gas manifold
and the injectors;
- re-power the appliance;
- select, using the boiler keyboard, the gas parameter type (P01)
and select (nG) in the case of methane supply or (LG) in the case
of LPG supply and save it;
- Carry out complete calibration of the gas valve:
• adjust the boiler nominal heat output;
• adjust the boiler nominal heat output in domestic hot water
phase;
- adjust (if necessary) the minimum heat output of the boiler in
the heating phase (Parag. 3.9parameter P05);
- adjust (eventually) the maximum heating power (Parag. 3.9paj-
rameter P06);
- aer completing the conversion, apply the sticker, contained in
the conversion kit, near the data nameplate. Using an indelible
marker pen, delete the data relative to the old type of gas.
ese adjustments must be made with reference to the type of gas
used, following the indications given in the table (Par. 4.1).
Checks following conversion to another type of gas.
Aer having made sure that the conversion is complete and that
the calibration has been successful, you must make sure that:
- there is no ame in the combustion chamber;
- the burner ame is not too high or low and that it is stable (does
not detach from burner);
e pressure testers used for calibration
should be perfectly closed and there
should be no leaks from the gas circuit.
Maintenance operations must be carried out by an au-
thorised company (e.g. Authorised Technical Assistan-
ce Service).
Burner adjustment must be carried out using a dierential "U" or
digital type pressure gauge connected to the pressure socket loca-
ted above the sealed chamber (det. 14 Fig. 35) and the gas valve
pressure point (det. 1 Fig. 39), keeping to the pressure value given
in the table (Par. 4.1) according to the type of gas for which the
boiler is prepared.
1
4
3
2
5
39
Key (Fig. 39):
1 - Gas valve outlet pressure point
2 - Coil
3 - Wiring connector
4 - Gas valve inlet pressure point
5 - P. Ref.
3.8 GAS VALVE CALIBRATION
e valve calibration must be carried out when the gas valve or the
P.C.B. is replaced or in the case of conversion to a dierent type of
gas.
To access the calibration phase, proceed as described below (Pa-
rag. 2.3):
Complete calibration
Before carrying out complete calibration, ensure that all
the requirements indicated in parag. 1.23 - 1.24.
No active requests for central heating or D.H.W. pro-
duction must be present and the boiler must not be in
“Stand-by” mode.
Access the valve calibration function.
Set parameter P15 to 5 and exit from the menu.
- Adjustment of boiler nominal thermal heat output.
• Press buttons ( ) and ( ) simultaneously for 5 seconds
until "Au" + "to" appears alternately on the display;
Press buttons ( ) and ( ) again for 5 seconds or
wait 2 minutes without implementing any adjustment to
exit from the complete calibration phase.