Adjustments - Beretta POWER PLUS Installation Instruction

Adjustments

The POWER PLUS Boiler is supplied for operation on
G20 (natural gas), as indicated on the rating plate, and
has already been adjusted in the factory by the manu-
facturer.
If, however, the adjustments need to be performed again,
for example after special servicing operations, the repla-
cement of the gas valve, or alternatively following the
conversion from G20 to G30-G31 or vice-versa, proceed
as follows.
CO ADJUSTMENT AT MAXIMUM OUTPUT
2
- Press the "Set/esc" and "+" buttons together for 5s.
- Start the boiler by adjusting the room thermostat.
The boiler will operate at maximum output showing
"H" on the display, followed by the outlet temperature
(chimney sweep function).
- Unscrew the cap (1) and insert the combustion analy-
ser probe
- Adjust the CO
screw (2) located on the fan assembly (turning
clockwise decreases the CO
ve a value of 9.0% for G20 and 10.4% for G30-G31.
CO ADJUSTMENT AT MINIMUM OUTPUT
2
- Press the "Set/esc" and "-" buttons together for 5s.
The boiler will operate at minimum output showing "L"
62
on the display, followed by the outlet temperature.
- Adjust the CO
screw (3) located on the fan assembly (turning anti-
clockwise decreases the CO
ve a value of 9.0% for G20 and 10.4% for G30-G31.
CHECKING THE CALIBRATION
Press the "Set/esc" and "+" buttons together for 5s and
check the max CO
G30-G31). Then press the "Set/esc" and "-" buttons
for 5s and check the min CO
10.4% for G30-G31).
After having completed the checks:
- Stop the chimney sweep function by pressing "OK"
- Adjust the thermostat so as to stop the boiler
- Remove the analyser probe and carefully retighten the
cap (1).
using a screwdriver on the adjustment
2
value), so as to achie-
2
using a screwdriver on the adjustment
2
value), so as to achie-
2
value (9.0% for G20 and 10.4% for
2
value (9.0% for G20 and
2
b
The adjustments at maximum and minimum
output must be carried out in the sequence
described, and only by BERETTA or personnel
authorised by BERETTA.
b
After adjusting the gas valve, seal it with sealing
wax.