20
e
6.9
PRESSURE GAUGE (see fig. 23)
Carry out component removal procedure as
described in 6.4.
Remove pressure gauge locking screw (1),
located on pump base, and withdraw the pressure
gauge pipe (2), locate the spring tabs on the
pressure gauge body, push and hold tabs in, to
enable extraction of the gauge from its location.
Replace in the reverse order.
6.10
PRIMARY THERMISTOR (see fig. 24)
Carry out component removal procedure as
described in 6.4.
Unclip and remove the air chamber cover, and
remove the right side air baffle.
Disconnect thermistor electrical plug. Using a
13mm spanner slacken and remove the
thermistor and sealing washer (1, 2) from the
main heat exchanger. Replace in the reverse
order.
6.6
SAFETY VALVE (see fig. 21)
Carry out component removal procedure as
described in 6.4.
Disconnect the outlet pipe from the safety valve,
remove safety valve locking screw (1) from the
heating manifold. Replace in the reverse order.
6.7
AUTOMATIC AIR RELEASE VALVE (see fig.
20) (AAV)
Carry out component removal procedure as
described in 6.4.
Using a suitable pair of pump pliers, unscrew the
AAV from the rear of the pump assembly. Replace
in the reverse order.
6.8
WATER PRESSURE SWITCH (see fig. 22)
Carry out component removal procedure as
described in 6.4.
Remove locking screw (1) and the water pressure
switch from the heating manifold, and – after
taking note of the electrical connections –
disconnect the wiring. Replace in the reverse
order.
Fig. 20
Fig. 21
Fig. 22
Fig. 23