Checking The Aeration Setting Of The Burner; To Remove The Ignition Microswitch; To Remove The Gas Shut-Off Microswitch - Baxi Fires Division 740FS Installer's Manual

17.1 Checking the aeration setting of the
burner.
1. The aeration shutter is factory set for use
with a 'pebble' ceramic fuel effect.
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 46).
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 screws.
17.2 To remove the ignition
microswitch.
See figures 47 & 48.
The ignition microswitch is stamped
V4NT9C4YC
1. Remove the bottom front cover and the
fire front casting.
2. Detach the microswitch cover by
removing one screw and pulling clear of the
location lug (See figure 47).
3. Disconnect the leads from the ignition
microswitch (The lower of the two
microswitches - See figure 48).
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.

17.3 To remove the gas shut-off microswitch.

(See figures 47, 48 & 49).
The gas shut-off microswitch is stamped V4NT9C2YCGPX or V4NT9C2YCAUX.
1.Remove the bottom front cover and the fire front casting.
2. Detach the microswitch cover by removing one screw and pulling clear of the
location lug (See figure 47).
©
Baxi Heating U.K. Limited 2007.
INSTALLER GUIDE
It is
Figure 47. Microswitch cover removal
Page 40
Figure 46. Aeration shutter settings for
'coal' and 'pebble' ceramic fuel effects.
Figure 48. Microswitches