Technical data

5.2 Gas Pressure
- Turn on an adjacent hot water draw off, the ap-
pliance will now light and the fan will change to high
Speed.
- With the front case fitted, check the burner set-
ting pressure at the pressure test point U.
- If the burner setting pressure is not correct, check
that the pressure at the gas service cock, test
point is 20 mbar (8 in.w.g.) with the appliance ope-
rating. 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 preset and non-
ajustable.
.4 Microswitch
5.5
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.
The microswitch is factory set and should not require adjustment. When the appliance is at rest the fan runs
continuously at low speed. check operation as follows set temperature selector to +. open draw off. The fan
should now come to high speed before the burner ignites. On closing draw off burner should extinguish before
the fan resumes at low speed. If fan/burner operational sequence is NOT as described consult or contact Chaffo-
teaux Ltd (Service Department).
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 and should be referred to Chaffoteaux Ltd (Sercice Department).
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5.4