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27
Tempra 12 / 18
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 isolation valve. The D.H.W. is drained by opening a hot tap.
The C.H. flow and return cocks are turned off at the isolation valve.
c) Remove components following special notice below and replace in reverse order.
d) Ensure water and gas washers are in good condition.
Final procedure
• Re-open valve and re-charge the system to about 1 bar, and vent boiler and radiators.
Re-charge to 1 bar if necessary.
• Upon completion of the work the following. Should be checked:
I) Gas soundness of all joints
II) Water soundness of all joints
III) The electricity supply.
IV) The pressure of the sealed system and top up
where necessary.
To lower the control panel
(fig. 21)
• Remove the two fixing screw (fig. 21) "A"
• Lift the two metal brackets "B"
• Rotate down the front panel "C"
Fig. 21
Remove and re-presurising of C.H. expansion
vessel
(fi g. 22)
• Refer to initial procedure a, b
• Isolate electricity and water supplies
• Remove outer case (two screws bottom rear corners)
• Loosen the "A" connections to expansion vessel
• Remove "B" screw
• Remove the expansion vessel
• Re-assemble in reverse order
• Re-pressure expansion vessel
(charge pressure 0,8-1 bar)
• Re-fill system to 1 - 1.5 bar
• Check for leaves
Fig. 22
B
C
A
A
B
