21
Fig. 29
6.17 AUTOMATIC BY-PASS (fig. 29)
Carry out component removal procedure as described in 6.4.
Remove the locking pin (
Q1
) that secures the cover (
R1
) to the
hydraulic manifold. Using a hooked piece of wire, carefully
withdraw the by-pass cartridge (
S1
) . Ensure all seals are in
good condition, taking care to ensure they are replaced correctly.
Replace in the reverse order ensuring the cartridge is facing the
correct way.
6.18 EXPANSION VESSEL REMOVAL (fig. 30)
Carry out component removal procedure as described in 6.4.
Disconnect the expansion vessel from the flexible expansion
pipe. Disconnect the flexible expansion pipe from the vessel.
Unscrew the nut that secures the vessel to the lower frame.
Locate and remove the screw (
U1
) that secure the vessel to
the top. The expansion vessel can now be removed. Replace
in the reverse order. Ensure all seals are in good condition,
taking care to ensure they are replaced correctly.
6.20.1 DHW FLOW RESTRICTOR (fig. 31)
Carry out the component removal procedure as described in
6.4.
Disconnect the cold water inlet pipe at the DHW flow switch
(
B2
). Using a small screwdriver, gently ease the flow restrictor
(
C2
) from its seating. Replace in the reverse order. Ensure all
seals are in good condition, taking care to ensure they are
replaced correctly.
6.20.2 DHW FLOW SWITCH (fig. 31)
Carry out component removal procedure as described in 6.4.
Remove the locking pin. Disconnect and remove the cold water
inlet pipe from the DHW flow switch & DHW heat exchanger.
Disconnect the wiring to the DHW flow switch. Slacken and
unscrew the inlet connection. Unscrew the nut (
E2
). Lift the
DHW flow switch housing from its seating. If necessary remove
the locking pin (
F2
) from the DHW flow switch, taking care not
to lose the float contained within the housing.
Replace in the reverse order ensuring that the housing is firmly
inserted onto its seating. Ensure all seals are in good condition,
taking care to ensure they are replaced correctly.
Fig. 30
Fig. 31
6.20.4 DHW THERMISTOR (fig. 32)
Carry out component removal procedure as described in 6.4.
Locate and disconnect the electrical plugs from the DHW
thermistor,). Gently ease the thermistor assembly (
J2
) from the
DHW outlet pipe.
Replace in the reverse order.
Fig. 32
S1
R1
Q1
U1
C2
F2
B2
J2
E2