Biasi M275V.2024 SM, Service Manual

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GENERAL ACCESS AND EMPTYING HYDRAULIC CIRCUITS
2 .5 Emptying the primary circuit
1 Close the C.H. circuit flow and return cocks "18" (Figure 2.10).
Figure 2 .10
18
19
2 Remove the front and right panels of the boiler.
3 Loosen the central heating drain cock "20" (Figure 2.11) until
the boiler is completely emptied.
Figure 2 .11
OPEN
CLOSED
20
4 To make draining easier, lift the plug "21" of the automatic
relief valve in Figure 2.12.
Figure 2 .12
21
2 .6 Emptying the D .H .W . circuit
1 Close the D.H.W. inlet cock "19" (Figure 2.10).
2 Open one or more hot water taps until the boiler has been
completely emptied.