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7. Checking and maintenance
7.4.5. Checking the automatic air vent
1. Switch off the boiler electrical power supply.
2. Close the gas valve on the boiler.
3. Close the main gas inlet valve.
4. Unscrew the two screws located under the front
panel by a quarter turn and remove the panel.
5. Tilt the control box forwards by opening the holding
clips located at the sides.
6. Check whether there is any water in the small hose
on the automatic air vent.
7. If any leaks are detected, replace the air vent.
7.4.6. Checking the siphon
WARNING
Siphon must always be full.
WARNING
Under no circumstance can trisodium phosphate,
commonly known as TSP, be used to clean a system
that contains aluminium.
This cleaning solution has a very high pH level which
will remove the natural protective oxide layer off
of the aluminium. Although the layer of oxide will
reform, if there are small amounts of trisodium
phosphate left in the system, they will continue to
remove the protective oxide layer which in turn will
reduce the life of the heat exchanger.
MCA-Pro ISM Rv.4.1 2/2017
MCA Pro 45/65/90/115
1
4
4
5
5
6
2
3
Gas/Gaz
90º
5
91
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