36
SERVICING
IMAX XTRA EL
-
Installation & Servicing
SER
VICING
40 GAS VALVE FILTER REPLACEMENT
39 IGNITION / DETECTION ELECTRODE TESTING / REPLACEMENT
1. Refer to Frame 34 & 36.
2. Ensure the boiler is drained
3. Remove the two hex head screws at the bottom of the inlet side
of the gas valve.
4. Remove the location section of the body.
5.
Withdraw the gas valve inlet filter.
6. Examine and replace as necessary.
7.
Refit in reverse order.
8. Conduct tightness test.
Refer to Frame 34 & 36.
IGNITION PROBE
1. Disconnect the lead from the spark generator and the
earth lead from the ignition probe assembly.
2. Remove the two nuts securing the ignition probe
assembly.
3. Withdraw the probe assembly carefully.
4.
To refit, carefully insert the probe assembly engaging the
securing stud.
5. Replace the two nuts and tighten. Re-connect the earth
lead and the spark generator lead.
IONISATION PROBE
6. Disconnect the wire from the ionisation probe. Disconnect
the earth lead from the ionisation probe assembly.
7. Remove the two nuts securing the probe assembly.
8. Remove the ring tag earth connection.
9. Withdraw the probe assembly carefully.
10. To replace, carefully insert the probe assembly into the
heat exchanger engaging the securing studs. Re-fit the
ring tag earth connection. Replace the securing nuts
and tighten. Refit the earth connection and the ionisation
probe lead.
SPARK GAP
The spark gap can be measured in-situ while the burner hood
and burner are removed. Ensure the spark gap is 5mm (±1mm).
IONISATION
The ionisation current should be checked at min and max rate
compared to the table below.
Max Rate
μA
> 8
Min Rate
μA
> 10
SER
VICING
