MAINTENANCE
TECHNICAL DOCUMENTATION 33
SAFETY
Maintenance should only be carried out by competent persons. Always isolate the gas supply at the gas
service valve and isolate and disconnect the electrical supply prior to the removal of any components. Ensure
that all external controls are isolated. After completion of maintenance or component replacement the
following should be checked:
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SERVICING SCHEDULE
To ensure the safe and efficient operation of the appliance, it is recommended that it is checked at regular
intervals and maintained as necessary. The frequency of maintenance will depend upon the installation
condition and usage, but should still be carried out at least annually. Mikrofill Systems Ltd. does not accept
liability resulting from the use of unauthorised components for the repair and maintenance of appliances not
in the companies recommendations and specifications.
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Test for gas soundness.
Check the water system is correctly filled and free of air. Air in the boiler could cause damage to the
heat exchanger. For this reason, the automatic air vent in the ETHOS 90, 110 and 130 must be left
open, whilst the ETHOS 70 should be manually vented.
With the system hot, check the boiler for signs of water leakage.
Check the gas rate and measure the CO
2
content to ensure it is within the specified range. Adjust if
necessary (see COMMISSIONING section on page 28).
Carry out functional tests.
If in the unlikely event there is a component failure, please refer to pages 34 - 37 for instructions on
removal of major components.
Light the boiler and carry out function checks, noting any operational faults.
Run the system up to operating temperature then check the gas consumption rate. Refer to page
29 for how to operate the boiler at maximum rate.
Connect a suitable flue gas analyser to the flue gas test point (see page 30) and check the CO
2
values are within those specified in the COMMISSIONING section. If the values are correct and the
CO / CO
2
ratio is within legal limits, then no further action is required. If the values are incorrect,
remove and clean the burner as described on pages 35 and 36.
Inspect the heat exchanger. If there are any signs of debris, vacuum the heat exchanger and flush
through with water.
Inspect the ignition electrode and ionisation probe, and replace if necessary.
Flush the condensate trap through with water.
Check that the flue terminal is unobstructed and that the flue system is sealed correctly.
After completing maintenance, carry out safety checks as described above.
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