Diagram 14.16
12820
14 Replacement of Parts
Diagram 14.15
13063
14.18 Domestic Hot Water Thermistor
For access, refer to section 14.1.
Refer to diagram 14.15.
Remove the electrical connections from the thermistor.
Remove the retaining clip from the DHW pipe.
Remove the thermistor from the retaining clip.
Note that the polarity of the wiring to thermistor is unimpor-
tant.
14.19 Plate-to-Plate Heat Exchanger
For access, refer to section 14.1.
Drain the boiler heating circuit, refer to section 14.2.
Refer to section 14.3 and drain the boiler hot water circuit.
Refer to diagram 14.16.
Remove the gas supply pipe from the gas service cock and
the gas valve, refer to relevant parts of section 14.7.
Remove the condensate trap as described in section 14.15.
Remove the four screws securing the plate-to-plate heat ex-
changer to the hydroblock, see diagram 14.16.
Remove the plate-to-plate heat exchanger.
When replacing the plate-to-plate heat exchanger ensure that
the four rubber sealing washers are fitted into the hydroblock.
NOTE: The plate-to-plate heat exchanger only fits one way
round.
Refill, vent and pressurise the boiler.
Open the cold-water isolation valve and slowly open a hot
water tap to remove air.
Close the hot water tap and check for any leaks.
Open the heating circuit isolation valves, re-pressurise the
system as necessary, refer to diagram 14.1.
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