SERVICING
Mini --- Installation & Servicing44
61 PRIMARY HEAT EXCHANGER
REPLACEMENT
1 Disconnect the electrical supply.
2 Remove outer and inner casing as explained in frame 36.
3 Close off the isolating cocks of the CH circuit at the
bottom of the boiler.
4 Release system pressure by opening the main circuit
drainage cock.
Do not release CH pressure using the pressure relief
valve. It may cause debris within the system to foul
the valve.
5 Remove the combustio n chamber panel A by unscrewing
the screws B. For models Mini C28, Mini S28 and Mini
C32 only, remove the screw C and the plate D.
6 Remove the clips E and the safety thermostat F. It is not
necessary to disconnect it from the wiring.
A
B
E
D
F
C
7 UnscrewthelocknutG,liftthepipeHandrotateitright
then move it downwards freeing it from the heat
exchanger connection.
8 Completely unscrew the connection I
9 Move the pipe J downwards freeing it from the heat
exchanger connection.
G
H
I
J
10 Remove the heat exchanger by sliding it forwards.
11 Re --- assemble in reverse order.
SERVICING
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