Chaffoteaux & Maury Britony FlexiFlue Installation And Servicing Instructions page 13

5.3
5.4
Microswitch
5.5
/
Gas Pressures
- Turn on an adjacent hot water draw off, the appliance
will now light and the fan will change to high speed.
- Check burner setting pressure at test point A see
Section 1.3. technical data.
- If the burner setting pressure is not correct, check that
the pressure at the gas service cock, test point B is 20
mbar (8 in.w.g.) with the appliance operating. If the
inlet pressure is not correct, check for any possible
blockage or restriction in the pipework to the
appliance. If the inlet supply pressure cannot be
corrected contact your local gas region. The heat
input to the appliance is pre-set and non-ajustable.
Slow Ignition
- Check burner ignition which should be smooth and
quiet (not explosive).
- If slow ignition requires adjustment proceed as in
Section 6.1 to remove front case.
- Adjust slow ignition device l/4 turn at a time. Refit
front case and recheck operation.
NOTE : Turning screw A clockwise delays ignition.
NOTE: During Commissioning it is important that the correct operation of the microswitch on the side of the gas
section is checked.
Whilst the microswitch is factory set, it may require adjustment. When the appliance is at rest the fan runs
continuously at low speed. Check operation as follows - set temperature selector to Othen open draw-off. The
fan should now come to high speed before the burner ignites. On closing draw-off, the burner should extinguish
before the fan resumes at low speed. If fan/burner operational sequence is NOT as described see Section 7.13.
The Pressure Switch
Check the operation of the pressure switch as follows : Open draw off, fan comes to high speed and the burner
ignites. Close draw off, burner extinguishes and when fan resumes at low speed listen for the 'click' as the relay
changes over. This should be followed within 15 seconds by a lighter 'click' as the pressure switch changes over. If
the time separation is greater than 15 seconds or if the pilot extinguishes it suggests that the pressure switch is
incorrectly set. See Section 7.11,
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