Replacement Of Parts - Ferroli ARENA 30 A Installation And Operating Instructions Manual

ARENA 30 A

3.4 Replacement of parts

Initial procedure
a) The boiler is cold, electricity supply is isolated, and the gas supply is turned off at the inlet of the boiler
b) For replacement of parts where water connections are broken, it will be necessary to isolate and drain
either or both the central heating or domestic hot water circuits of the boiler only. The cold water mains
inlet is isolated at the inlet cock. The D.H.W. is drained by opening a hot tap.
The C.H. flow and return cocks are turned off at the isolation cocks. The C.H. is drained via the pressure
relief valve (twist about 1/2 of a turn) and the discharge tap on right .
c) Remove components following special notice below and replace in reverse order.
d) Ensure water and gas washers are in good condition.
Removing Boiler Jacket and sliding control panel
To remove the boiler jacket, unscrew the four screws on bottom of the boiler and the two screws on front
supporting the control panel. Gently pull up the jacket.
If necessary, to have more space for working, the control panel could be slid forward , loosing the two screws
"B" (fig. 23b) and pulling the support bracket "C" (fig. 23c)
Final procedure
• Re-open cocks and re-charge the system to about 1.5 bar, and vent boiler and radiators.
Re-charge to 1.5 bar if necessary.
• Upon completion of the work the following. Should be checked:
1) Gas soundness of all joints
2) Water soundness of all joints
3) The electricity supply.
4) The pressure of the sealed system and top up where necessary.
Gas valve
• Isolate gas and electricity supplies
• Remove the lower protection plate jacket
• Remove the ignition device "A" from the valve body, removing the fastening screw "B"
• Unscrew the union nut between the gas valve and the gas inlet pipe
• Remove the flexible inlet air pipe from the Venturi mouthpiece on the fan
• Unscrew the fastening screws "C" and remove the Venturi unit + gas valve
• Unscrew the three fastening screws "D" and separate the gas valve and Venturi
B
A
C
D
Fig. 24
33