andrews MAXXflo EVO Series Installation And Maintenance Manual page 52

6.1.1.2 SPARK ELECTRODE AND IONISATION ELECTRODE
In order to maintain optimum reliability, it is recommended that both sets of electrodes are replaced every two years
regardless of their condition. Both of these electrodes are best inspected when they are still in place and the entire
heat exchanger door has been removed (see 6.1.1.1), but can also be inspected by carrying out the following :
• Turn off the heater and pull off the electrode lead(s).
• Unscrew the two screws retaining the spark electrode in position and carefully withdraw. Inspect for dam-
age and correct spark gap (see illustration below).
5.0mm (+/- 0.5mm)
• Undo the two screws retaining the fl ame sensing electrode.
• Withdraw and inspect for wear or damage.
• Replace electrode(s) if older than 24 months or if worn or damaged.
• Assembly is the reverse, ensure the gasket is undamaged and correctly placed.
6.1.1.3. CASE AIR & FLUE OUTLET SEALS
• Push on the fl ue sections to ensure fi rm connection between the joints.
• A visual inspection should establish there are no leaks around any of the seals, including the fl exible air duct
to the venturi. Replace if there is any doubt as to the integrity of the seals.
Examples of
check points
Maintenance 52 MAXXfl o EVO