Figure 6.1 – Gas valve
Gas valve Honeywell VK 4115V
LEGEND
A Plug
B Key Torx TX40
C screw adjustment CO2
D gas pressure intake
If the pressure measured by the pressure gage is not complying with the value re-
ported in Table 2.4 Network gas pressure → 12 (with a tolerance of ±15%), it is NOT
possible to switch the appliance on!
Proceed with the regulation/verification of the combustion parameters as stated 5.
in the next paragraph.
Checking and adjusting the combustion parameters
After having checked the dynamic mains pressure (see section), you may check and ad-
just the combustion parameters as follows.
Insert the combustion products analysis probe into the vertical tract of the flue gas 1.
pipe (see reference B in Figure 4.3 Fume outlet → 29).
Give the unit functioning consent and wait for at least 5 minutes for normal com-2.
bustion conditions.
With the appliance running, access menu 2 parameter 24 of the unit's controller: 3.
the display will flash "P_H1", press to confirm forcing maximum thermal power .
Check that the value of CO4. 2 read on the flue gas analyser coincides with the value
given in Table 6.2 Gas nozzles and content of CO2 → 51 at the "Content of CO2
with/MAX modulation" line with +0.2 -0.4 tolerance.
Example (G20 gas): the nominal content of CO2 is equal to 9.1%, values in the range
between 8.7-9.3% are therefore acceptable.
Access menu 2 parameter 23 of the unit's controller inside the electric panel: the 5.
display will flash "P_L1", press to confirm forcing minimum thermal power.
Now check that the difference between the value read in point 4 and that now 6.
displayed on the flue gas analyser, corresponds to the data given in the Table 6.2
Gas nozzles and content of CO2 → 51 at the "Delta CO2 between MAX and MIN
potentiality" line with tolerance of +0.3-0.0.
