General access and emptying hydraulic circuits
4
Fig. 2.9
2.5
Emptying the primary circuit
1
Close the c.h. circuit flow and return cocks.
2
Remove the front and right panels of the boiler.
3
Open the drain tap
F
(Fig. 2.10) until the boiler is
completely emptied.
F
CLOSED
OPEN
Fig. 2.10
4
To help the draining of the primary circuit loose
the condensing heat exchanger air purger valve
G
(Fig. 2.11)
G
Fig. 2.11
Attention: some water could remain in the condens-
ing heat exchanger.
5
Close drain tap once the emptying has been
completed.
