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9.2 COMPONENT REPLACEMENT
9.2.1 Preparation
Switch off the appliance using the On/Off button on the operating panel.
Switch off the electrical supply to the appliance.
Close the gas tap.
Unscrew the two recessed screws left and right at the front underneath
the appliance and lift/remove the front panel. See photo in § 4.4.3.
Wait until the appliance and the burner have cooled down.
Note – When removing cables/wires to the controller, the cable clamp
must be released first by unscrewing 2 posidrive screws and the controller
hinged down by unscrewing 2 posidrive screws as shown in diagram §5.4.
9.2.2 Gas valve/ ignition block
Note
Appliances manufactured after 1
st
January 2009 have a Torx T10 screw
holding the ignition block on the gas
valve. Remove this screw prior to pulling
the ignition unit off.
Note: The gas valve is factory-preset and therefore only Atmos or
their agents can supply these.
Remove the spark ignition block by pulling apart horizontally. Undo the
upper and lower unions, making sure that the ‘O’ rings and gas setting
ring are not lost or damaged (see diagram in § 7.7). Replace the gas
valve, and refit the unions and the ignition block.
Note: After replacing the gas valve, carry out the gas analysis adjustments
as given in § 7.9.
If replacing the ignition block, then pull apart as above. Remove the push-
fit cable to the probe and undo the X1 connections at the controller and
earth. Replace the ignition block and make the connections.
9.2.3 Fan
Remove the electrical connector. Undo the upper union from the gas
valve. Undo the two 8mm nuts as shown in the photo. Remove the
assembly including the sealing ring. Undo the three Allen screws (M4x10)
to remove the gas inlet sub assembly. Fit the replacement fan in reverse
order. Check the sealing ring is not damaged and replace if necessary;
check that it seals correctly.
See also § 9.1.3 for appliances fitted with Non Return Valve (flue gas).
9.2.4 Controller
If possible, record the parameters as described in § 7. Remove the display
cover and undo the two posidrive screws to drop down the controller panel
as shown in the diagram in § 5.4.
Pull apart the connectors and undo the 8mm nut to allow the controller
assembly to be removed and replaced. After replacement, set the
parameters, as described in § 7, to the previously recorded values, if
available, or as described in § 6 and § 7.
