andrews L24/31, Installation Manual, Operation And Service Manual

Page: 33 / 61

COMMISSIONING SECTION 4
Lighting the Burner
Open the main gas supply cock after all connections to the gas control are completed
and using a manometer, test all connections up to the gas control inlet. Purge air from
pipework and ensure there are no loose connections to burner or pilot pipe.
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.
Shutting Off The Burner
For long periods only, (7 days or more) turn control knob to PILOT, partially depress
knob, then turn clockwise to OFF. Turn off gas service cock. For shorter periods leave
heater under thermostat control.
Checking Incoming Gas Pressure
1. Turn gas control knob clockwise to OFF.
2. Release bleed screw A and connect pressure gauge tube.
3. Light burner as described above.
4. With the main burner running, the incoming gas pressure must be as follows:
PROPANE 37 mbar (14.86 in W.g.)
BUTANE 28 mbar (11.26 in W.g.)
The service governor should be adjusted if necessary to give the above values.
5. Turn the gas control to OFF, remove the pressure gauge, tighten the bleed screw and
check for gas leaks using a leak detection fluid.
HI-FLO RANGE
28
Fig 22.