Gas Adjustments; Changing The Type Of Gas - Immergas Super CAESAR Manual

Technical Documentation

Gas adjustments.

Maximum and minimum gas pressure adjustments can be
made by means of the gas valve respecting the values shown
in the tables relating to the type of corresponding gas (see the
technical data).
Measurements are made using a differential pressure gauge
whose positive pressure point is connected to gas valve outlet
(4) while the negative pressure point is connected, tanks to an
"Y" hose union, to the small silicone pipe that goes from the
gas valve to the sealed chamber.
Gas valve SIT 845.
Maximum pressure setting.
Draw d.h.w. after setting the temperature selector knob at
maximum.
Turn the brass nut (3) clockwise to increase the pressure to the
burner and anticlockwise to decrease it.
Minimum pressure setting.
(to be done after adjusting max pressure).
After interrupting supply to the modulation coil, turn the
crosshead screw (2) clockwise to increase pressure to the burner
and anticlockwise to decrease it.
Valve SIT 845
Legend:
1 - Coil
2 - Minimum pressure adjustment screw
3 - Maximum pressure adjustment nut
4 - Gas valve outlet pressure point
5 - Gas valve inlet pressure point
6 - Protection cap
STSC ed 09/04
Technical Documentation

Changing the type of gas.

Adaptation to a type of gas different to that for which the boiler
is intended, can be done by using the special kits (natural gas
or LPG).
The changeover consists in replacing the burner nozzles and
in moving the "NATURAL GAS- LPG" (S1) jumper on the
modulation board.
The minimum and maximum pressures are set afterwards on
the gas valve in the way described above.
The burner ignition pressure is not regulated because the
type of board operation does not require such a setting (see
modulation board operation).
NOTE: if you have to change to gas type G110 (town gas),
besides using the special nozzle kit and following the steps
described above, you will also have to shift the selector "S1"
jumper to selector "S2" which is on the electronic board (see
modulation board settings).
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Super CAESAR