Checking Main Burner Pressure; Hiflo Range Permanent Pilot Models; Lighting The Burner - andrews 24/39 Installation And Service Manual

Fig. 22
B
4.2

HIflo Range permanent pilot models

Fig. 23
Gas control knob
Thermostat
No
White
Issue 2 14/07/16
Position indicator
Off
Gas control
valve
Red
Thermopile
4.1.3

Checking main burner pressure

1. Turn burner OFF as above.
2. Remove brass cap from pressure adjustment port.
3. Release bleed screw A one turn and connect pressure gauge
tube.
4. Light burner according to the preceding instructions.
A
5. Adjust burner pressure at screw B in accordance with data
plate.
6. Turn screw clockwise to increase pressure and
counterclockwise to decrease.
7. Turn burner OFF as described above. Remove pressure
gauge tube and tighten screw A.
8. Refit brass cap to pressure adjustment port.
4.2.1

Lighting the burner

Open the main gas supply cock after all connections to the gas
control are completed and test all connections using a
manometer. Purge air from pipework and ensure there are no
loose connections to burner or pilot pipe.
Note
The gas control will be damaged if inlet pressure exceeds
35mbar.
1. Ensure gas supply is on.
2. Turn gas control knob to PILOT position.
3. Depress knob and activate piezo igniter.
4. Keep knob pressed in for a further 40 seconds after pilot
lights, then release knob and check that pilot remains lit. If
not, turn off then wait 3 minutes before repeating from step
2. Observe via the view port.
5. Turn control knob to ON and turn control thermostat dial to
required water temperature. The burner will now light.
6. Check pilot and gas connections for soundness with leak
detection fluid whilst burner is alight. Turn off, seal any
leakages, then re-test.
Warning
if pilot goes out, do not attempt to relight gas until at
least 3 minutes have elapsed. If gas supply has been
interrupted and immediately reconnected, unburnt gas
will pass into the combustion chamber due to operation
of the thermopile. Do not attempt to re-light for at least
5 minutes to allow unburnt gas to disperse. Ventilate
the area if possible.
Commissioning 4
37