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STVZ ed 02/06 VICTRIX Zeus
Technical Documentation
Technical Documentation
To check correctly and if necessary adjust the air-gas ratio,
proceed as follows:
- start the boiler in the chimneysweep mode and adjust the
heating output trimmer on the modulating control board
at minimum (see modulating control board operation).
- perform a combustion product sampling by inserting the
test probe as far as it will go.
- check to see if the carbon dioxide (CO
2
) value is within the
limits indicated in the table (previous page).
- if the values are incorrect, restore them to within the limits
by means of the gas valve’s off-set setscrew (3) which can be
accessed after having removed the protection cap.
- move the heating output trimmer to maximum and check
the measured carbon dioxide (CO
2
) reading with that indi-
cated in the table for nominal output (previous page).
Gas conversion.
e appliance can be adapted to a type of gas different to that
for which the boiler is factory set by using the special kits
(natural gas or LPG).
Transformation involves replacing the gas nozzle positioned at
the inlet of the Venturi pipe and regulating the maximum heat
output (see nominal and minimum heat output adjustment).
Finally, check the carbon dioxide (CO
2
) value at maximum
and minimum output and if necessary adjust by means of the
off-set signal (see air-gas ratio adjustment).
Legend:
1 - Gas valve inlet pressure point
2 - Gas valve outlet pressure point
3 - Off-set setscrew
Honeywell VK 4115 V valve
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