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WD53/0/1999
Chapter 7 : Replacement Of Parts
xii)
xiii)
7.4.9
Module Gas Low Pressure Switch (Fig. 5.7.3 item 134)
i)
ii)
iii)
iv)
v)
7.5
MODULE GAS ORIFICE (Fig 5.7.3 item 144)
i)
Isolate the appliance (Section 7.1)
ii)
Gain access (Section 7.2)
iii)
Unscrew and remove the brass plug from the gas outlet block.
iv)
Remove the rubber seal from the injector housing.
v)
Insert a flat blade screwdriver into the exposed hole and unscrew the gas injector.
vi)
Check the injector is the correct size for the boiler size.
vii)
Reassemble (Section 7.3)
NB: Ensure that the injector is screwed fully home
viii)
Reset the gas pressure and combustion (See Section 4 - Commissioning)
7.6
MODULE SPARK IGNITION/FLAME DETECTION ELECTRODE (Fig. 5.7.2 item 67)
i)
Isolate the appliance (Section 7.1)
ii)
Gain access (Section 7.2)
iii)
Remove the pull off HT lead to the spark ignition electrode.
iv)
Remove the burner head (Section 7.7 steps iv) to vi)).
v)
Undo the screws to the spark ignition electrode flange located on the burner
head and withdraw the spark ignition electrode.
vi)
Reassemble (Section 7.3)
NB:
7.7
MODULE BURNER HEAD & BURNER (Fig. 5.7.2 items 72 & 74)
i)
Isolate the appliance (Section 7.1)
ii)
Gain access (Section 7.2)
iii)
Remove the pull off HT lead to the spark ignition/flame detection electrode head.
iv)
Remove the two allen screws fixing the flange gas/air mixture pipe connection to
the burner head.
v)
Remove the five allen screws fixing the burner head to the top of the heat
exchanger.
vi)
Withdraw the burner & burner head from the top of the heat exchanger.
vii)
Unscrew the burner from the burner head taking care not to damage the burner
mesh. (grip the burner on the collet only).
viii)
Reassemble (Section 7.3)
NB:
ix)
Reset the gas rate (see Section 4 - Commissioning)
Installation & Servicing Instructions
Reassemble (Section 7.3)
Reset the gas rate (See Section 4 - Commissioning)
Isolate the appliance (Section 7.1)
Gain access (Section 7.2)
Remove the push on connectors to the gas low pressure switch taking
note of the correct positions.
Unscrew the gas low pressure switch from the brass holder.
Reassemble (Section 7.3)
When reassembling inspect the gasket for damage and replace if
necessary.
With the new spark ignition electrode in place it is essential to ensure the
gap between the tip of the electrode and the burner surface is 4mm.
Distances above or below 4mm will affect ignition performance. If
necessary gently bend the electrode taking care not to damage the
ceramic insulator.
When reassembling inspect any gaskets for damage and replace if
necessary.
Set the spark gap as detailed in Section 7.6
The Keston 260 & 340 Condensing Boilers
Page : 43
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