3. Mount the fill and drain valves to the boiler's inlet and outlet (valves
not provided).
N
Note
To facilitate maintenance work, we recommend mounting an isola
tion valve on the heating flow and return pipes.
Caution
Position the safety valves between the boiler and the isolation
valves.
4. Remove the anti-dust plug on the "heating return" inlet.
5. Connect the "heating circuit return" pipe to the boiler's "heating re
turn" inlet.
6. Mount the circulation pump on the "heating return" pipe (circulation
pump not provided).
6.3.2 Connecting the expansion vessel
1. Determine the volume of the expansion vessel according to the vol
ume of heating circuit.
See
Volume of the expansion vessel, page 41.
2. Connect the expansion vessel to the heating circuit return pipe.
Fig.42 Mounting the fill and drain valves
MW
-3000029
3
Fig.43 Connecting the "heating circuit re
turn" pipe
MW
-3000030
5
4
Fig.44 Mounting the circulation pump
MW
-3000031
6
6 Installation
40
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