Replacing The 3-Way Valve; Cleaning The Plate Heat Exchanger - Baxi MainEco Combi 24 Installation And Service Manual

Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24
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8.3.2.
If it becomes necessary to replace the 3-way valve, proceed as
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follows:
1. Close the main water valve.
2. Drain the boiler:
- Open a domestic hot water tap to release the pressure and drain
any water from the circuit.
- Connect the filling loop to the heating return connection.
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- Open the isolation tap and drain the circuit into a suitable
receptacle.
- When the water has stopped flowing, close all the isolation taps.
3. Open the protective cover for the fan at the top.
4. Disconnect the three-way valve cable from the automatic control
unit.
5. Unclip the locking clip that holds the 3-way valve.
6. Dismantle the 3-way valve by rotating a screwdriver.
7. Remove the 3-way valve.
8. To re-assemble, perform the above actions in reverse order.
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R000400-A
8.3.3.
Depending on the water quality and the operating mode, limescale
deposits may form in the plate exchanger. As a general rule, a
periodic inspection, along with cleaning, if necessary, is sufficient.
The following factors may affect the periodicity:
4 Water hardness.
4 Composition of the limescale.
4 Number of hours' operation of the boiler.
4 Draw-off rate.
4 Domestic hot water set point temperature.

Replacing the 3-way valve

CAUTION
Be careful of the positioning cams on the 3-way valve.

Cleaning the plate heat exchanger

8. Checking and maintenance
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