Measuring The Ionisation Current; Checking The Air And Gas Pressure On The Com- Bustion Head; Final Checks (With Burner Operating) - Riello 20034365 Installation, Use And Maintenance Instructions

Start-up, calibration and operation of the burner
5
5.9

Measuring the ionisation current

The burner is fitted with an ionisation system to check that a
flame is present. The minimum current for control box opera-
tion is 6 μA.
The burner provides a much higher current, so controls are
not normally required.
However, if it is necessary to measure the ionisation current, dis-
connect the plug-socket (2)(Fig. 35) on the ionisation probe
cable and insert a direct current microammeter (1)(Fig. 35) with
a base scale of 100 μA.
Carefully check the polarities!
1
2
5.10 Checking the air and gas pressure on the com-
bustion head
Gas pressure
+
_
D8697
20035512
D8696
Fig. 35
+
_
Air pressure
Fig. 36

5.11 Final checks (with burner operating)

 Open the thermostat/pressure switch TL:
 Open the thermostat/pressure switch TS:
the burner must stop
 Rotate the maximum gas pressure switch knob to the mini-
mum end-of-scale position.
 Rotate the air pressure switch knob to the maximum end-of-
scale position.
the burner must stop in lockout
 Switch off the burner and disconnect the voltage.
Disconnect the minimum gas pressure switch connector.

the burner must not start
 Disconnect the ionisation probe wire.
the burner must stop in lockout due to ignition failure
 Make sure that the mechanical locking systems on the differ-
ent adjustment devices are fully tightened.
23
GB