Valor BR622 Installer's Manual page 26

figure 52
Thormocouple interrupter block
15.7.6 Refit in the reverse order.
15.8 TO REMOVE THE THERMOCOUPLE
INTERRUPTER BLOCK (See figure 52)
15.8.1 Remove the front surround unit - See
section 15.3.
15.8.2 Detach the thermocouple from the
interrupter block by unscrewing the
thermocouple nut.
15.8.3 Detach the two microswitch leads from
the interrupter block.
15.8.4 Remove the interrupter block by
unscrewing from the gas shut-off tap.
15.8.5 Refit in the reverse order. If the
microswitch leads cannot be easily
attached to the interrupter block when
it is fully tightened to the gas shut-off
tap, slacken it and rotate to allow the
leads to be fitted. Retighten making
sure that the leads remain in place in
the interrupter block. Fit and tighten the
thermocouple nut making sure that
the leads are secured in the interrupter
block to give a good electrical contact.
15.9 TO REMOVE THE PILOT UNIT (See
figure 53)
15.9.1 Remove the burner unit - See section
15.6.
15.9.2 Detach the pilot pipe from the gas shut-
off tap.
15.9.3 Detach the thermocouple from the
interrupter block by unscrewing the
thermocouple nut.
15.9.4 Detach the electrode lead from the
underside of the electrode tab.
INSTALLER GUIDE
15.9.5
15.9.6
15.9.7
15.9.8
Note
15.10
15.10.1 Remove the burner unit - See section
15.10.2 Turn the burner unit upside down.
Page 26
figure 53
Pilot unit removal
(dust cage not shown for clarity)
Remove the first screw securing the
dust cage to the pilot unit & burner.
Carefully remove the dust cage and
place aside. See figure 53.
Remove the second screw securing the
pilot unit to the burner. Remove the
pilot unit and place it aside. See figure
53.
Disconnect the pilot pipe from the pilot
unit elbow.
Refit in the reverse order.
1 The pilot unit must be replaced as a
whole assembly. Its individual
components are not separately
replaceable.
2. Once removed, ensure that the dust
cage is cleaned before refitting.
Make sure that it locates squarely onto
the pilot unit without any gaps between
the cage edges and the pilot unit.
3. When the thermocouple is removed
from the interrupter block, the
microswitch lead terminals in the
interrupter block will be loose. Make
sure that they are properly secured to
give a good electrical contact when
retightening the thermocouple nut
TO REMOVE THE SHUT-OFF TAP (See
figure 54)
15.6.
Detach the thermocouple and
interrupter block from the tap - See
sections 15.8.2 to 15.8.4.