16.1 Checking the aeration setting of the burner.
1.
The aeration shutter is factory set and
will
require
adjustment.
It is important to ensure that the aeration
setting is correct (See
figure 32).
2.
To adjust the aeration setting, loosen the two aeration shutter
screws, slide the aeration shutter to the position shown in
figure 32 and tighten the fixing screws.
16.2 To remove the ignition microswitch.
(See figures 33 & 34).
The ignition microswitch is stamped
V4NT9C4YC
1.
Remove the fascia.
2.
Detach the microswitch cover by
removing one screw and pulling clear of the
location lug (See figure 33).
3.
Disconnect the leads from the ignition
microswitch (The lower of the two
microswitches (See figure 34).
4.
Detach the microswitch and insulation pad
by removing two screws.
5.
Replace in the reverse order. Check
that the microswitch operates correctly
by fully closing it and observing that
there are sparks at the pilot electrode.
16.3 To remove the gas shut-off
microswitch.
(See figures 33, 34 & 35).
The gas shut-off microswitch is stamped
V4NT9C2YCGPX or V4NT9C2YCAUX.
1.
Remove the fascia. as in section 16.4
2.
Detach the microswitch cover by
removing one screw and pulling clear of
the location lug (See figure 33).
3.
Loosen the thermocouple nut to free the microswitch leads and pull the leads clear of
the thermocouple interrupter block (See figure 35).
4.
Detach the bridging bracket, microswitch assembly by removing two screws (See
figure 34).
5.
Replace in the reverse order. When refitting the leads to the interrupter block, make
sure that they are secured firmly to give a good electrical contact.
Page 29
INSTALLER GUIDE
Figure 34. Microswitches
Figure 33. Microswitch cover removal
Figure 32. Aeration
shutter setting
