Supplied By www.heating spares.co Tel. 0161 620 6677
22
6.20
DHW FLOW SWITCH fig. 29
Carry out component removal procedure as de-
scribed in 6.4.
Disconnect the cold water inlet pipe (A) from the
DHW flow switch. Disconnect the wiring to the
DHW flow switch. Remove the locking pin from
the DHW flow switch and lift the DHW flow switch
from its location. Replace in the reverse order.
Ensure all seals are in good condition, taking care
to ensure they are replaced correctly.
6.21
DHW HEAT EXCHANGER fig. 20
Carry out component removal procedure as de-
scribed in 6.4.
Before removing the DHW heat exchanger, it
may be necessary to first remove the pump
assembly and condense trap. Locate and re-
move the screws (E) that secure the heat ex-
changer to the DHW manifolds. Carefully remove
the heat exchanger from its location taking care
not to spill any residual water. Replace in the
reverse order ensuring that the heat exchanger
‘O’ ring seals are correctly inserted into the DHW
manifolds. Ensure all seals are in good condition,
taking care to ensure they are replaced correctly.
6.22
VALVE ACTUATOR fig. 30
Carry out component removal procedure as de-
scribed in 6.4.
Remove the locking pin (A) that secures the
actuator (B) to the hydraulic manifold. Discon-
nect the electrical plug from the actuator. Re-
place in the reverse order.
6.23
DIVERTOR VALVE CARTRIDGE fig. 30
Carry out component removal procedure as de-
scribed in 6.4.
Remove the valve actuator as described in 6.22.
Remove the cartridge locking pin (C) and - using
a suitable pair of pliers - withdraw the cartridge
Fig. 30
Fig. 30a
assembly. The cartridge assembly is a non-
serviceable item and therefore needs to be re-
placed if it’s suspected as being damaged or
worn. Replace in the reverse order ensuring that
the seating cam inserts into the locating groove
correctly (see fig. 30a). Ensure all seals are in
good condition, taking care to ensure they are
replaced correctly.
6.24
DHW THERMISTOR fig. 31
Carry out component removal procedure as de-
scribed in 6.4.
Disconnect the electrical plug. Using a suitable
pair of pliers, remove the thermistor locking pin
(E) and ease the thermistor (F) from its seating.
Replace in the reverse order ensuring the sealing
ring is in good condition.
6.25
AUTOMATIC BY-PASS fig. 31
Carry out component removal procedure as de-
scribed in 6.4.
Locate and remove the hydraulic cover locking
pin (A) and remove the cover. Using a suitable
hooked wire or screwdriver, gently ease the non-
return valve (C) from its seating. 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.
6.26
DHW NON-RETURN VALVE fig. 31
Carry out component removal procedure as de-
scribed in 6.4.
Locate and remove the hydraulic cover locking
pin (A) and remove the cover. Using a suitable
hooked wire or screwdriver, gently ease the non-
return valve (D) from its seating. 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.
6.27
EXPANSION VESSEL fig. 1
Should the removal and replacement of the ex-
pansion vessel be deemed impractical, an exter-
nal expansion vessel may be fitted to the return
pipe as close to the appliance as possible.
6.27.1 EXPANSION VESSEL REMOVAL (with suffi-
cient clearance above)
Carry out component removal procedure as de-
scribed in 6.4.
Disconnect the flue from the appliance.
Fig. 31
E
F
A
D
C
