Burner And Supply Pipe Installation; Preliminary Burner Checks; Lighting The Fire; Operating The Burner - Baxi 939 Installation And Owner's Manual

front support leg of the burner.
Using 4 screws secure the front fixing bracket and ceramic support bracket to the
base of the floor.
Locate the burner onto the rear ceramic support bracket ensuring that the control
knob bracket sits in front of the front support bracket. Secure the burner to the
ceramic support bracket using the two screws removed previously. Secure the burner
to the front securing bracket using the screw removed previously.

7. BURNER AND SUPPLY PIPE INSTALLATION

A nut and olive is provided for an mm pipe inlet connection directly to the gas control.
The inlet 'T' connector / elbow can be rotated to allow a connection from any
direction. The inlet 'T' connector includes a valve for isolating the gas supply. Note
that the centre of the appliance inlet 'T' connector is 25mm above the fireplace floor.
The inlet 'T' connector should be fitted to the supply pipe at this stage.
The supply pipe must be rigid material. Flexible pipe must not be used. Connect the
supply line to the appliance.
Turn on the gas supply and pressure check the installation pipework for gas
soundness. In the United Kingdom (GB) check in accordance with the current edition
of BS 6891. In the Republic of Ireland check in accordance with the current edition of
IS 813 "Domestic Gas Installations".

7.1 Preliminary burner checks.

Some burner operations can be checked at this stage. Checking now will mean that
less disassembly will be required if any problems are found. A full check should still
be made, however, after final installation.

7.1.1 Lighting the fire

If closed open the isolating inlet 'T' connector. Depress the control knob and slowly
,
rotate it anticlockwise to the pilot ignition position. A 'click' will be heard as the integral
piezo operates. A spark should be seen between the electrode and pilot tip. Turn the
control knob clockwise to the 'Off' position. Repeat this operation until a flame
appears at the pilot. There may be a delay before the pilot lights due to air being
purged from the system. When a flame appears at the pilot keep the control knob
depressed and hold the pilot ignition position for ten seconds. When the control knob
is released the pilot flame should remain lit.

7.1.2 Operating the burner.

When the pilot burner is operating properly, gradually turn the control knob anti-
clockwise to 'HIGH' (Depress the knob slightly to get past the pilot ignition position).
The main burner should now light. Depress the control knob slightly to release from
the 'HIGH' position and turn back (clockwise) to 'LOW'. While turning, the burner
flames should gradually become lower but remain alight. Depress the control knob
slightly to release from the 'LOW' position and turn back (clockwise) to the 'pilot
© Baxi Heating U.K. Limited 2009.
INSTALLER GUIDE
Page 21