Pump; Function; Removal Pump Head - Biasi RINNOVA ADAPTIVE M300V.2025 SM Service Manual

7

PUMP

7 .1 Function

The pump "A" in Figure 7.1 and Figure 7.2 has the function of
making the water in the main circuit circulate through the main
condensing heat exchanger and therefore through the C.H. sys-
tem (during the C.H. function) or through the secondary heat ex-
changer (during the D.H.W. function).
Figure 7 .1
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
Check that the pump is not seized and that the movement of
the rotor is not subject to mechanical impediments.
With the boiler off, remove the front panel. Remove the air re-
lease plug of the pump and turn the rotor with a screwdriver.
Check that the impeller is correctly connected to the rotor
shaft and that the rotor moves freely.
With the boiler off remove the front and right hand side case pan-
els, lower the control panel and empty the primary circuit.
Remove the pump head by undoing the screws which hold it to
the pump body and check that the impeller is firmly joined to the
rotor.
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A
PUMP

7 .2 Removal pump head

Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
1 Remove the front case panel.
2 Empty the primary circuit of the boiler.
3 Disconnect the connector "B" (Figure 7.2).
4 Unscrew the four screws "C" and remove the pump head "A".
Figure 7 .2
Reassemble the pump head carrying out the removal operations
in the reverse order. When reassembling the pump head, check
the correct position of the gasket and tighten the screws "C" pro-
ceeding diagonally around the pump.
B
A
C