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Central heating
Water connection overview, internal unit
1. Feed to central heating, 3/4"
2. Return from central heating, 3/4"
3. Feed from external unit (hot), 1"
4. Return to external unit (cold), 1"
5. Circulation pump between external and internal units
6. Buffer tank
7. Filling and drain cock
8. Stop valve with particle filter
9. Safety valve (central heating)
10. Manometer (central heating)
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