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3.4 Replacement of Parts
Initial procedure
a) Ensure the boiler is cold, electricity supply is isolated, and the gas supply is turned off at the inlet
valve on the boiler
b) For replacement of parts where water connections are broken, it will be necessary to isolate and drain
the water circuits of the boiler only. The cold water mains inlet is isolated at the inlet cock.
The C.H. flow and return cocks are turned off at the isolation valves. The C.H. is drained via the drain
off valve on the appliance.
c) Remove components as shown below and replace in reverse order.
d) Ensure water and gas washers are in good condition.
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.
To lower the control panel
• Remove the two fixing screw "A"
• Rotate down the front panel "B"
Remove and re-presurising of C.H. expansion vessel
• Refer to 3.4 a, b
• Isolate electricity and water supplies
• Remove outer case (two screws bottom rear corners)
• Loosen the "A" connection to the expansion vessel
• Loosen screws "B" and remove the bracket
• Remove the expansion vessel
• Re-assemble in reverse order using the new vessel
• Check the expansion vessel pressure;
(charge pressure 0,8-1 bar) through the valve "C"
• Ensure pressure relief value is open
(twist about 1/2 of a turn) when re pressurizing and
refill the system ensuring there are no leaks.
It may be necessary to remove the boiler to
change the expansion vessel due to site restrictions.
24
Sys 10 - 23
A
A
B
fig. 17
B
C
fig. 18
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