Heat Exchanger - andrews MAXXflo EVO Lite Installation And Maintenance Manual

a
a
(25 35 45kW models)
c c c c c
(15kW model)
f
c
10 Maintenance

10.4.12 Heat exchanger

b b b
b b b
• With the front cover removed, remove screws (b) and loosen screws
(a), then lift and slide the GUI to the left. The slot design allows for the
GUI to lock into place.
• Disconnect the fl ue temperature sensor (d) wiring
• Disconnect the fl ue limit fuse (e) wiring
• Unclip the fl ow sensor (c) and return sensor (f) from the copper pipes in
and out of the heat exchanger.
e
d
(25 35 45kW models)
f
g
h
• Disconnect the electrical connections of the ionisation probe (g), ignition
probe (h), fan (j) and gas valve (i) and place wiring to one side.
i
• Remove the complete burner from the heat exchanger (please refer to
section 10.3.2 for instructions).
j
CAUTION
Changing the following components will require a partial drain-
ing of the water system. Once completed it is essential that all
the air is removed from the heat exchanger before the heater
is operated. To not do so may damage the heat exchanger and
invalidate the warranty.
Note:
The rear bottom pipe is the return pipe and the wiring colour for
the return sensor (f) is black.
The front bottom pipe or front top pipe (depending on model) is
the fl ow pipe and the wiring colour for the fl ow sensor (c) is white
87 MAXXfl o EVO Lite