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SERVICING
mini HE --- Installation & Servicing 49
71 DHW HEAT EXCHANGER
REPLACEMENT
1 Disconnect the electrical supply .
2 Remove outer casing (refer to frame 42).
3 Close the isolating cocks of the CH circuit and DHW
supply at the bottom of the boiler.
4 R elease 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 R elease the pressure of the DHW circuit by opening a hot
tap.
6 Removethedivertervalveactuator(seeframe69).
7 Completely unscrew the two Allen key screws A which
hold the exchanger to the brass groups.
A
8 Move the exchanger towards the rear of the bo iler and
extract it.
9 R e---assemble in the reverse order.
Attention. When reassembling the exchanger be sure to
put the off center location/securing pin indicated towards
theleftsideoftheboiler.
72 CH DRAIN COCK REPLACEMENT
1 Disconnect the electrical supply
2 Remove front and right hand casing panels
(refer to frame 42).
3 Close off the isolating cocks of the CH circuit at the
bottom of the boiler.
4 R elease 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 CH drain cock A from the return body.
6 Re---assemble in reverse order.
A
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