37
GAS REGULATION VALVE
Fig. 31
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LEGEND
1 EV1 solenoid valve
2 EV2 solenoid valve
3 Inlet pressure outlet
4 Pint outlet pressure outlet
5 P. of additional outlet pressure
Adjustment of the gas valve
The hot air generators of the MEC MIX C series are
equipped with gas valve with constant gas air ratio.
All valves are calibrated at the factory for use with
Natural gas, in case of replacement or performance
verification or if necessary it is possible to carry out
the calibration of the gas valve followed slavishly the
operations described below, which must be carried
out by following them in the order.
Remove the hood of the minimum adjustment screw
A as shown in fig. 32.
Then proceed with the adjustment of the minimum.
With the help of the GA1 remote control, set the
generator power to minimum after starting the
generator.
In this condition adjust the CO2 content to the fumes
by reading the value with a fume analyzer and
adjusting the value by acting on the screw of the
minimum “
B
”.
Bring the burner to maximum power and check the
value of the CO2 percentage to the fumes, correcting
it if necessary by adjusting the maximum power
adjustment screw “
8
”. The minimum screw “
B
”
adjusts the gas air ratio by moving the ideal upward
or downward line of the ratio as shown in fig. 33.
The adjustment screw of the maximum “8”, on the
other hand, modifies the inclination of the gas-air
ratio line fig. 34.
Return the burner to the minimum power and check
the CO2 content of the fumes and reconnect the
value if necessary.
Bring the burner back to its maximum speed again
power and check the CO2 value on the fumes and
if necessary correct it by turning the screw “8”, see
fig. 31.
The double check will guarantee a constant air gas
ratio and within the limits of the tolerances indicated
in fig. 34.
6 Air signal connection
7 Adjustment of O (offset)
8 Adjustment of the ratio (opt.)
9 Pilot output (optional)
10 Main gas outlet
11 Side exit
GAS VALVE ADJUSTMENTS
Fig. 32
A
B
