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18.15 Pressure relief valve.
Drain the boiler's hydraulic circuit as
detailed in 18.2.
Disconnect the discharge pipe on the outlet
of safety valve.
Disconnect the safety valve from the
hydraulic block retaining the o-ring for use
on reassembly.
Fit the replacement safety valve in reverse
order to removal and refill, vent and
pressurise the boiler ensuring all joints are
sound.
32
18.16 Pressure sensor
Drain the boiler's hydraulic circuit as
detailed in 18.2.
Disconnect and remove the sensor cable
and sensor from the flow sensor housing.
(figure 48)
Fit the replacement pressure sensor in
reverse order ensuring the gasket is
correctly fitted. (Replace the gasket if
damaged)
18.17 Flow sensor housing
Drain the boiler's hydraulic circuit as
detailed in 18.2.
Remove the secondary heat exchanger as
detailed in 18.9.
Release the pump outlet pipe nut and rotate the
pipe for ease of removal.
Remove the pump, motor and body together
with the flow sensor housing as detailed in
18.8.
Remove the section of the housing from the
pump by releasing the clip.
Figure 48
Figure 47
18.17 Flow sensor housing
Drain the boiler's hydraulic circuit as detailed
in 18.2.
Remove the secondary heat exchanger as
detailed in 18.9.
Release the pump outlet pipe nut and rotate the
pipe for ease of removal.
Remove the pump, motor and body together
with the flow sensor housing as detailed in
18.8.
Remove the section of the housing from the
pump by releasing the clip.
Disconnect the diverter valve motor electrical
connection and remove the motor by releasing
the clip as described in 18.20.
Release the nut connecting CH outlet
connection to the diverter valve (figure 49).
Page 32
solaris 24PC, 30PC
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