Periodic Examination Of Venting System; Proper Procedure For Cleaning Exhaust Flue - Watts AERCO EXT Installation, Operation & Maintenance Manual

Modulex EXT Commercial Series
CHAPTER 8: Maintenance Schedule
Before servicing, always carry out the following steps:
1. Disconnect the mains electrical supply to the boiler.
2. Separate the boiler from the electrical supply by means of a separating device with an open
contact of at least 3 mm (for example, safety devices or power switches) and ensure that it
cannot be accidentally connected to power.
3. Close the external ON-OFF gas valve installed upstream of the boiler.
4. If necessary, and in keeping with the type of work to be carried out, close any ON-OFF valves
fitted on the C/H flow and return pipes, as well as the cold water inlet valve.
5. Remove the boiler front panel.
6. Perform the maintenance in keeping with official instructions and accepted standards and
regulations.
7. After completing all the necessary maintenance work, always follow these steps:
a) Open the C/H flow and return valves as well as the cold inlet valve (if previously closed).
b) Purge and, if necessary, proceed with restoring the heating system's pressure until a
pressure of 0.8 – 1.0 bar is reached.
c) Open the external ON-OFF gas valve installed upstream of the boiler.
d) Reconnect the appliance to the electrical supply and switch on the mains electrical supply.
e) Test for correct operation, on the gas side and on the water side.
8. Replace the boiler front panel.

8.2 Periodic Examination Of Venting System

The inspection of the boiler and venting system should be performed every year and full
maintenance should be done every two years. Please contact AERCO for further guidance on
the frequency of maintenance and service requirements. Contact details can be found on the
back page of this manual.
Verify that the air ventilation system, air intake and air intake pipes are unobstructed.

8.3 Proper Procedure For Cleaning Exhaust Flue

The flue exhaust system, including condensate evacuation, should be checked annually. Annual
maintenance includes verifying that the flue manifold and exhaust vents are clean and
unobstructed. It is necessary to inspect and clean the condensate siphon in particular.
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