Table of Contents
Advertisement
5.7
Positioning the diaphragm (LPG operation)
The burner is supplied to operate with methane gas (G20)
A diaphragm 4)(Fig. 8) supplied with the kit, allows burners to
operate on LPG (G31) if fitted to the gas valve 1).
The diaphragm must be installed in compliance with local laws
and regulations. .
To carry out the modification:
cut off the electrical supply;
close the fuel interception tap;
disassemble the gas valve 1) from the Venturi unit 2) by
removing the screws 3);
house the diaphragm 4) supplied with the kit in the
gasket 5);
reassemble the gas valve and carry out all the adjustment
operations described above.
5.8
Fuel supply
The burners are teamed with one-piece pneumatic proportioning
gas valves, via which the amount of gas delivered, and hence the
output produced, can be modulated.
A signal reporting pressure detected in the air circuit is carried to
the pneumatic gas valve, which delivers an amount of gas in pro-
portion to the airflow produced by the fan.
To optimise the bulk, the gas train is assembled directly on the
body of the burner.
5.8.1
Gas train assembly
The connection valve-manifold allows compensating the acci-
dental occlusion of the suction line through the distributed gas re-
duction.
Technical data
Valve model
Mixer model
Gas line connection
Working temperature
Max. working pressure
Min. working pressure
Max. inlet pressure
Valve class
Electrical supply
Protection level
5.8.2
Air/gas mixer
Gas and combustive air are mixed inside the purging circuit (mix-
er), starting from the intake inlet.
Through the gas train, fuel is introduced into the intake air current
and optimal mixing commences with the aid of a mixer.
Installation
Honeywell VK4125V 2003 4
Honeywell 45.900.444-003B
DN 15 - inlet 1/2"
-15°C/70°C
30 mbar
15 mbar
60 mbar
B + B
220-240 V
IP 40 according to IEC 529
Tab. A
1
3
3
4
5
Key (Fig. 9)
1
Gas pressure downline test point (P2)
2
Gas pressure downline test point (P1)
3
Gas supply
4
Flange
5
Gas valve
6
Minimum gas flow adjustment on the stabiliser (V2)
7
Minimum gas flow adjustment (V1)
8
Air/gas mixer in the suction line circuit
11
GB
D8564
2
1
6
D11282
D7155
5
4
2
Fig. 8
8
7
D7376
Fig. 9
20037207
Hide quick links:
Advertisement
Table of Contents
