ALUTHERM
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Boilers 45
ALUTERM A 170 - 300
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Installation, user and service manual
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instructions for user
Heating
Alutherm A 170 - 300
7.2
Adjustment % CO2 and check input
The boiler is equipped with an automatic gas/air regulator. This means that the amount of gas is regulated depending on the amount of air. The %
CO2 needs to be adjusted according to the table below;
The boiler has a gas valve that is connected to a venturi. See figure below;
Adjustment for max. load ;
• wait until the boiler is stable and measure % CO2
• if required, correct CO2 with the throttle ;
turning t gives a higher CO2 percentage
(a ½ turn (180°) causes a change of approximately 0,85 % CO2)
Adjustment for min. load ;
• wait until the boiler is stable
• if required, correct the CO2 with the off-set ; turning towards
+ gives a higher CO2 percentage. Note : this offset adjustment
is very sensitive : half a turn (180°) causes a change of
approximately 1 % CO2.
Check on heat input
In the table below the relationship between nominal input and
fan speed and gas flow is given. The nominal fan speed can be ±
5% due to adjustments in production.
If the gas flow is too low it may be due to an obstruction (dirt) in the air/flue system. Check and if necessary clean.
The gas flow must then be re-checked.
Type of boiler
Gas type
inlet pressure
%CO2 on max load
%CO2 on min load
A 170
G20/G25/G25.3
20 / 25 mbar
9,3 +0,2-0,05
9,1 +0,15-0,2
A 210
G20/G25/G25.3
20 / 25 mbar
9,3 +0,2-0,05
9,1 +0,15-0,2
A 260
G20/G25/G25.3
20 / 25 mbar
9,3 +0,2-0,05
9,1 +0,15-0,2
A 300
G20/G25/G25.3
20 / 25 mbar
9,3 +0,2-0,05
9,1 +0,15-0,2
Model
A 170
A 210
A 260
A 300
Nominal input
168
210
252
290
[kW Hi]
Fan speed nominal
5300
5450
5850
5800
[rpm]
Gasflow G20
17,4
21,8
26,2
30,5
[m3/h]
Throttle
Off-set
