Checking The Aeration Setting Of The Burner; To Remove The Ignition Microswitch - Baxi 748 Installer's Manual

INSTALLER GUIDE

16.1 Checking the aeration setting of the burner.

1. The aeration shutter is factory set for
use with a 'pebble' ceramic fuel effect. It
is important to ensure that the aeration
setting is correct for the ceramic fuel effect
used. Check the aeration shutter setting
even if fitting the 'pebble' fuel effect (See
figure 33).
2. To adjust the aeration setting to suit the
fuel effect used, loosen the two aeration
shutter screws, slide the aeration shutter to
the desired position and tighten the fixing
Figure 33. Aeration shutter settings
screws.
16.2 To remove the ignition
microswitch.
(See figures 34 & 35).
The ignition microswitch is stamped
V4NT9C4YC
1. Remove the bottom front cover and
the front cover casting.
2. Detach the microswitch cover by
removing one screw and pulling clear of
the location lug (See figure 34).
Figure 34. Microswitch cover removal
3. Disconnect the leads from the
ignition microswitch (The lower of
the two microswitches - See figure
35).
4. Detach the microswitch and
insulation pad by removing two
screws.
5. Replace in the reverse order.
6. Check that the microswitch
operates correctly by fully closing it
and observing that there are sparks at
the pilot electrode.
Figure 35. Microswitches
Page 35
©
Baxi Heating U.K. Limited 2006.