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6.6
SAFETY VALVE (fig. 23)
Carry out component removal procedure as
described in 6.4. Disconnect the outlet pipe (A)
from the safety valve, remove safety valve locking
pin (B) from the hydraulic manifold. Replace in the
reverse order.
fig. 23
6.7
LOWER AUTOMATIC AIR RELEASE VALVE
(fig. 22)
Carry out component removal procedure as
described in 6.4. Remove the expansion pipe
locking pin (D) from the pump assembly and
remove the expansion pipe. Locate and remove
the AAV locking pin (G) from the pump assembly
and remove the AAV assembly (H). Replace in
the reverse order.
6.7.1
TOP AUTOMATIC AIR RELEASE VALVE (fig.
24)
Carry out component removal procedure as
described in 6.4.
Remove the drain pipe (A). Unscrew the top AAV
(B). Replace in the reverse order. Loctite or similar
should be used as a thread sealant for the AAV.
6.8
WATER PRESSURE SWITCH (fig. 23)
Carry out component removal procedure as
described in 6.4. Locate and remove the locking
pin (C) from the water pressure switch. Remove
the wiring. Carefully withdraw the switch. Replace
in the reverse order.
6.9
PRIMARY THERMISTOR (fig. 1)
Carry out component removal procedure as
described in 6.4.
chamber front cover. Unclip the primary thermistor
from the flow outlet pipe. Disconnect thermistor
electrical plug. Replace in the reverse order.
6.10
RETURN THERMISTOR (fig. 1)
Carry out component removal procedure as
described in 6.4. Unclip and remove the air
chamber front cover. Unclip the return thermistor
from the return inlet pipe. Disconnect thermistor
electrical plug. Replace in the reverse order.
B
C
A
B
A
Fig. 24
Unclip and remove the air
6.11
PRINTED CIRCUIT BOARD (fig. 25)
Carry out component removal procedure as
described in 6.4. Pull the control fascia forward
and lower it. Push the clips (A) which secure the
PCB cover, remove cover, after carefully taking
note of all wiring connections and jumper tag
configuration. Unhook and remove connection
block (B). Disconnect all wiring from the PCB,
locate and remove the PCB securing screws,
remove the required PCB. Replace in the reverse
order ensuring that the position of the 3 control
knobs are correctly aligned with the respective
potentiometers on the PCB.
Ensure that the correct jumper tag configuration
has been respected. It will be necessary to check
the functioning of the PCB is set for the correct
boiler type/application.
Fig. 25
6.12
GAS VALVE (fig. 26)
Carry out component removal procedure as
described in 6.4. The gas valve must be changed
as complete unit. Disconnect the electrical plug
and leads from the gas valve, slacken and
unscrew gas valve inlet and outlet connections.
Please note, the sealing washers (B) must be
discarded and replaced with new sealing washers.
Disconnect the compensation pipe (C). Locate and
remove gas valve retaining screws (D) on the
underside of the boiler if required, the gas valve
can now be removed. Replace in the reverse order.
Check and adjust burner pressure settings.
WARNING, A GAS SOUNDNESS CHECK MUST
BE CARRIED OUT.
fig. 26
6.12.1 INJECTOR (fig. 26)
Carry out component removal procedure as
described in 6.4. Unscrew and remove gas pipe
connections (A & E). Locate and remove the
injector (F) inside the pipe. Replace in the reverse
order. Check and adjust burner pressure settings.
WARNING, A GAS SOUNDNESS CHECK MUST
BE CARRIED OUT.
B
A
A
B
D
B
F
E
C
19
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