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00CNO0192-E (U0627512)
CONDENSINOX -
Installation, Use and Maintenance
figure 14 -
R1 and R2 adjustment screws
-
R2
+
+
R1
-
Gas valve
Gas flow
adjustment screw
Gas regulator setpoint
adjustment screw
Upstream pressure
measurement point
figure 15 - Measurement orifice
Opening for inserting
the sensor for CO
2
Concentric
adaptor
ATTENTION:
All work involving a change in the type of gas must be carried out by
a qualified professional.
The valve must be adjusted on the boiler in operation at both maximum
and minimum power. Use the 'Manual power program' operating mode
(see section 3.3.4 of the manual for the NAVISTEM B3000 boiler controller),
which allows you to change directly to the minimum or maximum setpoint
(0% or 100%).
The adjustment values have been validated for the gas supply pressures
at the valve intake (pressure measured upstream, burner in operation)
given in the following table:
Type of gas
G20
G25
G31
Supply pressure (mbar)
20
25
37
4.7.1.
Changing from G20 to G25
Before starting the burner, on the gas valve,
preset the gas flow rate, using the gas flow rate
adjustment screw R1, to the appropriate value
given in the table below.
Start the burner at maximum power.
Using a combustion analyser, measure the CO
2
ratio in the exhaust gases: on the concentric
adapter, remove the plug from the lower opening
and insert the CO
2
measurement sensor into the
centre of the flow in the exhaust duct.
Check the CO
2
value at maximum power and,
if necessary, use the R1 valve gas flow rate
adjustment screw to obtain the values of CO
2
in
the table below.
Change to minimum power and check that the
CO
2
value is within the range in the table below. If
necessary, use the R2 setpoint adjustment screw.
If the setting is adjusted at minimum power, go
back to maximum power and recheck the CO
2
value. Repeat the operation until both values
comply with the table below.
Return to the standard operating mode.
After making the gas change settings, stick
the label corresponding to the new gas type in
place of the old one.