ACV EVO S 100, Installation, Use And Maintenance Instructions, Page: 37 / 154

EVO S
, Installation, Commisioning and Servicing Instructions
37
EN
4.5.3. Adjusting the gas valve
- Before starting the burner, on the gas valve,
preset the gas flow rate, using the gas flow rate
adjustment screw Throttle/R1, to the appropriate
value given in the table below.
- Start the burner at maximum power.
- Using a combustion analyser, measure the CO2
ratio in the exhaust gases: on the gas duct,
remove the plug from the opening and insert the
CO2 measurement sensor into the centre of the
flow in the exhaust duct.
- Check the CO2 value at maximum power Qmax
and, if necessary, adjust the gas flow screw
Throttle/R1 of the valve in order to obtain the CO2
values in the table below.
- Change to minimum power Qmin and check that
the CO2 value is within the range in the table
below. If necessary, use the setting adjustment
screw Offset/R2.
- If the setting is adjusted at minimum power, go
back to maximum power Qmax and recheck the
CO2 value. Repeat the operation until both values
comply with the table below.
- Return to the standard operating mode.
After changing the type of gas:
- Check the sealing of the gas line.
- Stick the G31 label provided in place of the
original label (G20).
Figure 12 - EVO S 40 to 60 setting
Figure 13 - EVO S 70 to 120 setting
Figure 14 - VR415 for 150 kW model
00U07443960-A
Offset/R2
Throttle/R1
Under cap
Throttle/R1
Offset/R2
00U07446410-A
Throttle/R1
Offset/R2
(Under cap)