Heatrae Sadia R 45 PLUS 3KW, Installation, Operation And Maintenance Manual

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Disconnect the two solenoid power connectors, red
and black wires
`
At either end of the inlet control assembly are two
15mm push fit connectors. Remove the inlet control
assembly by releasing the two push fit connectors,
one from the internal tank and the other from the
cold water feed pipe, see figure 17.
`
The mesh filter can be found in the end of the
15mm pipe on the input side of the solenoid pipe.
`
Move the inlet assembly to the left to clear the
support bracket and pull the assembly down and
out to clear the unit.
Figure 18: Inlet assembly filter removal
`
Ensuring the unit is drained, use an appropriate
tool, remove the sensor cover, see figure 19.
WARNING
Due to a build up of scale and the
temperature of the tank the sensors may be
difficult to remove. If necessary the sensors
can be eased out of their housings by using
a pair of nylon faced pipe pliers and by
applying gentle outward pressure through
the pliers
`
Using a torch, inspect the filter for any debris, if
debris is present remove it. If the debris cannot
be removed then the filter must be replaced, see
spares list page 29, spare 13.
9.3.2.1 Inlet Pipe Filter replacement

If the mesh filter requires replacement, the inlet
control pipe may have to be replaced, item 28 in the
spares section page 29.
`
To refit the inlet control assembly firstly make sure
the assembly is complete, then engage the 15mm
push fit on the inlet feed pipe.
`
Push the other push fit connection onto the internal
tank, ensure the 15mm push fit connectors are
now correctly engaged.
`
Refit the inlet control assembly support bracket.
`
Re-connect the two solenoid power connectors,
red and black wires.
M5
x1
(Security)
Figure 19: Sensor cover removal
Figure 20: Sensor removal
`
Ensuring the unit is drained, use an appropriate
tool, remove the sensor cover, see figure 20 below.
Underneath the cover are two sensor assemblies,
they are the water level sensor, lower bolt and the
tank overfill sensor, upper bolt.
`
In turn, remove the sensors and inspect for a build-
up of scale.
`
Re-connect the two earth wires that are connected
to the copper pipe work.
`
Carryout final inspections to check that all parts
removed are correctly fitted and all electrical wires
are re-instated.
9.4 Routine inspection & maintenance
operations – Water Sensor Inspection
Figure 17: Inlet assembly removal