andrews R18 Series, Technical Documentation Manual

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18IP22B
48
Fig. 31 Removing the burner
Remove the burner for inspection as follows:
After removing the burner, the combustion chamber and the
underside of the heat exchanger can easily be inspected.
Heat exchanger (internal inspection)
Internal inspection must be carried out by qualified and author-
ised personnel.
Sight glass
A sight glass can be found on the left hand side (on alternative
handings the sight glass will be located on the right side) of the
burner assembly for inspection of:
- water heater ignition
- combustion
- pilot flame
Burner tray
The burner manifold and the gas regulator are connected by
means of a coupling.
1 Close the gas service cock and disconnect from the supply.
2 Release the burner from the water heater frame (4 bolts).
3 Disconnect the spark plug, ionisation caps, servo-motor
plugs and solenoid value plugs and remove the ‘earth’ lead.
4 Carefully withdraw the burner from the water heater unit.
Inspect for dirt and clean the burner bars if necessary.