33
Gas valve adjustment
The unit is delivered with the gas valve adjusted for
running methane gas at the specified data.
If valve adjustment is required after checking the CO2
value, it shall be carried out as follow:
1. remove the cap A as shown in picture 33, to adjust
the minimum gas flow rate
2. connect the CO2 analyser to the exhaust outlet
3. start the heater and by means of the control panel
run it at the minimum heat output
4. read the CO2 detected and adjust the gas valve to
have the CO2 within the required range
5. set the heater at the maximum heat output
6. check theCO2 value is still with in the requiredrange;
if not adjust the regulator n.8, which refers to the
maximum output
7. repeat from step 3 till the CO2 value is within
the required range at both max and min heater’s output
The B regulator actually move up and down the line
in the diagram in picture 34 whilst the n.8 regulator
change the slope of the line (picture 35).
GAS REGULATOR VALVE
Fig. 31
LEGEND
1 SolenoidEV1
2 SolenoidEV2
3 Attack of inlet pressure
4 Attack of outlet pressure Pint
5 Addictional attack of outlet pressure
6 Air signal connection
7 Off set adjustment
8 Ratio adjustment (opt.)
9 Pilot outlet (optional)
10 Primary gas outlet
11 Side outlet
A
B
GAS VALVE ADJUSTMENT
Fig. 32
