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cHANGING PArTS
9.0
9.4
BurNEr SuB ASSEMBLY
For access refer to section 9.1 General.
The burner, fan, gas valve and venturi form part of a sub-assembly that must
be removed before one of them can be replaced. To remove the sub-assembly
remove the no electrical plugs from the fan and gas valve and remove the
no earth connections from the gas valve and fan. Remove the gas connection
using a 30mm open ring spanner, then the six nuts securing the combustion
chamber front cover with a 10mm AF spanner. Carefully withdraw the sub
assembly from the combustion chamber.
9.4.1
BurNEr
Remove the three screws securing the gas manifold to the combustion chamber
cover with a Torx T5 driver to release the burner. The burner can then easily
be pushed out from the combustion chamber cover.
Note: When replacing the burner check that the 'D' shape cut out is located
correctly over the equivalent shaped projection provided in the combustion
chamber cover and fit a new rubber gasket.
9.4.2
FAN/GAS vALvE AND vENTurI ASSEMBLY
Remove the two screws holding the gas valve and venturi assembly to the fan
using a Torx T5 driver then remove the four nuts securing the fan to the gas
manifold with a 8mm A F spanner. Check and replace any seals and gaskets as
necessary. Be particularly careful not to damage the cork gasket between the
fan and the gas valve and venturi assembly and check when re-assembling
each of these items that they are correctly aligned
NOTE: The ribbed gasket on the gas manifold should always go at the top
where this component connects to the combustion chamber cover.
If replacing the gas valve and venturi assembly it will be necessary to remove
the incoming gas tail piece by removing the 4 no screws using a pozi drive type
screw driver. When removing the tail piece take care not to lose or damage
the 'O' ring seal.
NOTE: The gas throttle on the air/gas venturi (ie cO2 level) and offset
pressure settings of the gas valve fitted to this boiler are factory set and
sealed. These settings must not be adjusted. When required the whole
assembly must only be replaced by a factory set and sealed replacement
supplied by Gledhill Ltd. After replacing the gas valve the combustion
cO2 must always be checked at the point provided on the flue. (See
commissioning section of the manual for details).
Burner
Chamber
Cover
Gas
Manifold
Venturi
Gas Valve
Combustion chamber cover screws
Page 34
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