Adjusting The Gas Valve; Combustion Parameters - DeDietrich 24 Installation And Service Manual

7.4.1

Adjusting the gas valve

Fig.126 Gas valve
K
P
P
i
7.4.2

Combustion parameters

Fig.127 Type of fittings — flue gas
measuring point
Ø 100
Ø 60
A
B
A
7804841 - 02 - 20012022
Pout
V
BO-0000204
Ø 80
Ø 80
B
A
A
7 cm
BO-0000220
Caution
If it is necessary to adjust the gas valve, always remove the Allen
key while waiting for the CO
P OFFSET measurement pressure socket
Pi Gas supply pressure socket
Pout Gas pressure socket on the burner
V Gas flow rate setting screw
K OFFSET setting screw
Perform the operations indicated below to calibrate the gas valve:
Calibration of the MAXIMUM heat input
Check that the value of CO
boiler operating at maximum heat input, is as indicated in the table
entitled "Service Settings". Otherwise, adjust the setting screw (V)
located on the gas valve.
- Turn the screw clockwise to increase the content of CO
the value of O .
2
- Turn the screw anti-clockwise to reduce the content of CO
increase the value of O
2
Calibration of the REDUCED heat input
Check that the CO / O
2 2
boiler operating at minimum heat input, is that shown in the "Service
Parameters" table. Otherwise, adjust the setting screw (K) located on
the gas valve.
- Turn the screw clockwise to increase the content of CO
the value of O .
2
- Turn the screw anti-clockwise to reduce the content of CO
increase the value of O
2
The boiler has two dedicated sockets in order to measure the combustion
efficiency and cleanliness of the combustion exhaust gases during
operation. One socket is connected to the flue gas exhaust circuit (A)
which is used to detect the cleanliness of the combustion exhaust gases
and the combustion efficiency. The other is connected to the combustion
air intake circuit (B) in which it is possible to check the recirculation of the
combustion products. The following parameters can be measured when
using the socket connected to the flue gas circuit:
temperature of the combustion exhaust gases;
concentration of oxygen O
concentration of carbon monoxide CO.
The temperature of the combustion air must be measured using the socket
connected to the air intake circuit (B), inserting the measurement probe
approx. 7 cm. Measure the content of CO
temperature at the dedicated measuring point. Proceed as follows to do
this:
Unscrew the plug of the flue gas measurement point (exhaust system
adaptor).
Measure the content of CO
equipment. Compare this with the control value.
7 Commissioning
/O values to stabilize.
2 2
/O measured in the exhaust pipe, with the
2 2
.
value measured on the exhaust duct, with the
.
or alternatively carbon dioxide CO
2
/O and the flue gas discharge
2 2
/O in the flue gas using the measuring
2 2
en
and/or reduce
2
and/or
2
and/or reduce
2
and/or
2
;
2
INIDENS 183