Emptying The Dhw Circuit; Emptying The Heating Circuit; Cleaning The Primary Exchanger; Check The Pressure In The Heating Expansion Tank - Biasi RINNOVA CV Series User Manual And Installation Instructions

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Figure 9.3

9.3 Emptying the DHW circuit

• Close the installed DHW inlet cocks .
• Open the system's DHW cocks.

9.4 Emptying the heating circuit

• Close the installed heating system delivery
and return cocks.
• Loosen the heating circuit drain cock 8 indi-
cated in Figure 9.4.
OPEN
Heating circuit
drain cock
Figure 9.4
- 58 -
MAINTENANCE
• To make draining easier, unscrew the auto-
matic bleed valve cap 22 in Figure 9.5.
Figure 9.5

9.5 Cleaning the primary exchanger

Remove the front body panel and the front
combustion chamber panel.
If there is dirt on the primary exchanger fins,
fully cover the surface of the burner ramps
(using a piece of newspaper or similar) and
brush the primary exchanger using a bristle
brush.
9.6 Check the pressure in the heat-
Empty the heating circuit as described in sec-
CLOSED
tion "Emptying the heating circuit" on page
58 and check that the expansion tank pres-
sure is not less than 1 bar.
If the pressure is lower, correct the pressure.
8
9.7 Cleaning the domestic hot water
Descaling the domestic hot water exchanger
will be assessed by a technician from an Au-
thorised Service Centre, who will perform the
cleaning using specific products.
ing expansion tank
exchanger
22