DOMINA N 80 DGT
32
7. REPLACEMENT OF PARTS
7.01 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. fl ow 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).
c) Remove components following special notice below and replace in reverse order.
d) Ensure water and gas washers are in good condition.
7.02 Final procedure
• Re-open cocks 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.
7.03 To lower the control panel
(fi g. 34)
• Remove the two fi xing screw (fi g. 34) "A"
• Rotate down the front panel "C"
Fig. 34
7.04 Remove and re-presurising of C.H. expansion vessel
(fi g. 35)
• Refer
to
7.01 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) through the valve "C"
•
Ensure pressure relief value is open
(twist about 1/2 of a turn) when repressurizing
Fig. 35
B
A
C
C
A
C
Summary of Contents for DOMINA N 80 DGT
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