Ariston CLAS HE SYSTEM 24 Installation And Servicing Instructions page 68

user' manual
Initial operating procedures
If the boiler is installed inside the apartment, make sure that
all provisions relating to the air inlet and room ventilation (in
compliance with current legislation) are respected.
Check the water pressure on the display regularly and make sure
that the figure is between 0.6 and1.5 bar when the system is cold.
If the pressure is just under the minimum value the display will
request a filling procedure.
To re-pressurise the boiler, it will be necessary to connect the silver
flexible hose supplied to the two isolating points underneath the
boiler, once the hose is connected, open up both of the black
quarter turn handles, once the pressure reads 1.5 bar on the
display, close both handles and disconnect the hose .
If the pressure drops very frequently, there may be a water leak
at some point in the system. If this is the case please contact your
installer and ask them to check it.
If the pressure drops very frequently, there may be a water leak at
some point in the system. If this is the case a plumber should be
contacted.
Ignition procedure
Press the ON/OFF button on the control panel to switch on the boiler.
The display shows:
The first figure indicates the operating mode:
0 - Stand -by,
C - Central heating request
c - Heating post-circulation
H - Hot water post-circulation
F - Circulation pump anti-freeze protection enabled
- burner anti-freeze protection enabled
The second and third figures indicate:
- the flow temperature when no heating requests have been
made
- the flow temperature when the boiler is operating
- the flow temperature in anti-freeze mode.
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Note: Connections viewed from behind boiler