COSMOGAS MYDENS, Installation, Use And Maintenance Manual

Page: 38 / 76

38
MYDENS
COSMOGAS
Figure 6.13 - Combustion analysis points
6.8 - Controlling the level of
CO2 and any adjustment
The boiler in normal operating mode and for altitudes within 1000
m, has a level of CO2 (carbon dioxide) in the fumes, which can be
detected in the table in chapter 9. A value different to those reported
can cause malfunctions. Combustion analysis must be performed to
check and eventually adjust this value. Proceed as follows:
1.- check a combustion analyser to the appropriate point on
the fumes exhaust fitting “B” in figure 6.13;
2.- make sure that any cocks and thermostatic valves
downstream from the central heating circuit are open;
ATTENTION !!! During forcing of the delivery
temperature, it automatically goes to 93°C to give the
possibility to dispose of as much of the heat generated
by the boiler as possible. Check that the central heating
plant can support this temperature.
3.- press the and RESET keys simultaneously
for more than 5 seconds to enter the “installer” menu,
confirmed by the appearance of the icon on the
display.
4.- using the and keys, access the
parameter
2010
;
5.- press the RESET key to enter the parameter and use the
and keys to modify the value to
HIgH
;
6.- press the RESET key to confirm the modification. Now
the burner will operate at maximum power for 10 minutes.
7.- wait for the CO2 measurement to stabilise;
8.- compare the value measured with that given in the
table in figure 6.7, “CO2 maximum power”. If the value
measured is offset from the value read, it must be taken
back within the value given in the table in figure 6.7.
Proceeding as follows:
a) turn screw “A” clockwise as in figure 6.14 to decrease
the level of CO2;
b) turn screw “A” anti-clockwise as in figure 6.14 to increase
the level of CO2;
9.- once the check has been completed, seal the screw “A” in
figure 6.14 with red paint or similar system;
10.- press the RESET key again to enter the parameter
2010
and use the and keys to modify
the value to
LOu
;
11.- press the RESET key to confirm the modification. Now
the burner will operate at minimum power for 10 minutes.
12.- wait for the CO2 measurement to stabilise;
13.- compare the value measured with that given in the
table in figure 6.7, “CO2 minimum power”.
If the value measured is offset from the value read, it must
be taken back within the value given in the table in figure
6.7. proceeding as follows:
a) turn screw “B” anti-clockwise as in figure 6.14 to decrease
the level of CO2;
b) turn screw “B” clockwise as in figure 6.14 to increase
the level of CO2;
14.- Once the check has been completed, seal the screw “B”
in figure 6.14 with red paint or similar system;
15.- press the RESET key again to enter the parameter
2010
and use the and keys to modify
the value to
OFF
;
16.- press the RESET key to confirm the modification.
17.- hold the RESET key down for 5 seconds to exit the
“installer” menu.
6 - OPERATING
B
A
C
D
E
020002.01.015
Figure 6.14 - Gas valve
A - CO2 adjustment screw at maximum power;
B - CO2 adjustment screw at minimum power;
A
B
020002.01.045
E
F
G
020002.01.021
Figure 6.12 - Controlling combustion agent air
pressure