1611UDSBD-3GBEN, Pag. 22/36
Burner gas pressure
adjustment
The gas pressure is set for the required heat input before the appliance leaves the
factory. Provided that the gas supply to the air heater is in accordance with the
supply pressure described on the appliance data plate, the operating pressure will
not require adjustment. To check the pressure use the following procedure:
* Ascertain from the heater’s data plate the correct operating gas pressure;
* Turn the room thermostat control to its lowest setting;
* Remove the screw from the burner pressure test point of the multi-functional
control valve. Connect a manometer to the test point( see fi gure 9 );
* Adjust the room thermostat to call for heat i.e. above room ambient temperature;
* Observe the burner gas pressure on the manometer and compare to the required
pressure on the data plate;
* If necessary, adjust the burner gas pressure. Remove the ccover cap. Turn the
regulator screw anti-clockwise to decrease pressure or clockwise to increase
pressure (see fi gure 9 );
* Set room thermostat to lowest setting to turn OFF the burners. Replace the test
point screw/cap and with the main burner OFF, test for gas soundness using a
leak detector fl uid.
Reset temperature control/room thermostat to comfort operating level.
Figure 9 : Honeywell gas valve
1) Shut-off solenoid valve EV1
2) Pressure regulator setting device, or, alternatively, outlet fl ow setting screw
3) Inlet pressure test point
4) Outlet pressure test point
5) Shut-off solenoid valve EV2
6) Pilot outlet
7) Main gas outlet
8) Holes (M5) for fi xing fl anges
1
2
8
7
5
3
6
4
Table 7: Burner jets and pressures
015-3
020-3
025-3
030-3
Nat.
Gas
(G20)
Burner
jet
dia
3,70
4,20
4,80
5,30
Burner
pressure
mbar
7,80
7,10
8,20
7,50
inlet pressure
20 mbar
Prop.
(G31)
Burner
jet
dia
1,19
2,15
2,60
2,80
Burner
pressure
mbar
36,90
36,90
36,80
36,80
inlet pressure
37 mbar
Minimum inlet pressure natural gas G20: 16,6 mbar
Minimum inlet pressure propane gas G31: 35,2 mbar
