Atmos Energy HE26 - Manual (Page 46)

9. SERVICING THE BOILER AND COMPONENT REPLACEMENT
9.1 SERVICING THE BOILER
The appliance and the system should be serviced annually by a qualified
service engineer.
For appliances connected to propane gas, a six monthly service for the
first two years to simply clean the condensate trap and pipe may be
neccessary. Due to the nature of propane gas, a jelly like substance can
build up in the trap, causing it to become blocked.
9.1.1 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. Swing out the
expansion vessel by undoing the clip to raise the vessel slightly.
9.1.2 Checking the heat exchanger and spark ignition probe
Remove the connector from the fan and the ignition block from the gas
valve.
Disconnect the lower gas valve union.
Unscrew the 10 socket screws (Allen socket M8x40) from the front cover
and remove this forwards complete with gas valve and fan.
While removing the front cover do not hold this at the gas valve or the fan.
Be careful not to damage the burner and the fan while removing the
front plate.
The burner does not need any maintenance.
Never clean the burner with a brush or compressed air. This causes
damage to the metal fibre.
Check the spark ignition probe and gently clean any deposits. As the
spark gap cannot be checked directly, use a flat surface across the corner
of the heat exchanger to measure the distance to the probe. See the
diagram in § 8.2. The distance should be in the range 27 to 29mm.
Replace the probe if necessary.
Remove the baffles that have been placed crosswise in the fins of the
heat exchanger.
If necessary, clean the baffles and the fins of the heat exchanger from top
to bottom with a brush or with compressed air.
If necessary, clean the bottom side of the heat exchanger and the
condensate discharge at the bottom of the flue discharge behind the heat
exchanger.
Reassemble the baffles in the heat exchanger.
Check the silicone gasket of the front cover for damage (hair) cracks
and/or discolouring and replace if necessary.
Mount the front cover to the heat exchanger and attach this with the
socket screws with spring washers. Crosswise tighten the socket screws
evenly by hand. Using an Allen key, tighten the screws so that the front
cover is closed onto the heat exchanger all round the edge, and then
tighten up (approx 1/8 th turn).
Make sure that the silicon gasket is well placed around the front cover.
Reconnect the gas union below the gas valve.
Check the sealing ring for damage and replace if necessary.
Fit the connector on the fan and the ignition block on the gas valve.
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