MHS Boilers ADI LT, Инструкция по установке, эксплуатации и обслуживанию

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ADI LT boiler - Technical Manual Page
L338 11/2011
49
h) To vary CO
2
(to vary the gas flow) for models ADI LT 250 and higher: turn (with a key HEX3) the adjustment
wheel positioned in the higher part of the gas valve, with the boiler in front:
- By turning counter clockwise the gas flow increases (and so CO
2
)
- By turning clockwise the gas flow decreases (and so CO
2
).
i)
Then proceed to adjust the combustion at the
boiler minimum power.
j)
Decrease the fan revolutions to the minimum, by
pressing the button (3) of the control panel. The
display (13) will show two big zeros.
k) Check the content of CO
2
with the flues analyzer
(by introducing the probe inside the chimney flue
outlet of the boiler that you are adjusting).
l)
To vary CO
2
(to vary the gas flow) for models
ADI LT 120 and higher: turn (with a screwdriver
type TORX T40 or similar) the adjustment wheel
positioned in the front corner of the gas valve,
with the boiler in front:
- By turning clockwise the gas flow
increases (and so CO
2
).
- By turning counter clockwise the gas flow
decreases (and so CO
2
).
m) Repeat the previous steps both at the maximum and the minimum power until the values of CO
2
are correct at
both stages.
n) Once finished, press the button 3 or 2 to go back to the automatic operation mode.
In this way, you will obtain two points of a straight line, as you can
see in the chart, where “Pg” is the gas pressure (mbar) and “Pa” is
the
air pressure (mbar).
With the higher control of the gas valve you can vary the slope of
the
straight line (movement A in the chart).
With the lower control of the gas valve you can move the straight
line vertically (movement B in the chart).
Detail of the multi-block gas valve in model ADI LT 105 -
200:
(1)
(2)
Pa
Pg
B
A
(1) Adjustment of the maximum power: turn
clockwise

less gas flow. By means of a Torx
wrench.
(2) Adjustment of the minimum power: turn
counter clockwise

more gas flow (the opposite
than before). By means of a flat screwdriver.