Commissioning The Appliance - Baxi Bermuda Inset 2 Boiler 50/4 Installation And Servicing Manual

6.0 Commissioning the Appliance - Page 18

6.1 Commissioning the Appliance

1. Reference should be made to BS 5449 section 5 when
commissioning the boiler and system. Flush the whole
system in accordance with BS7593:1992. (See Treatment of
Water Circulating Systems section 3.2). Check the system
for leaks.
2. Turn the gas service cock ¼ turn from the off position
(Fig. 26). This will supply gas to the boiler only. Purge the air
from the gas service pipe in accordance with BS 6891 and
test for gas soundness.
3. Turn the boiler thermostat to the OFF position (Fig. 27)
and ensure that all external controls e.g. room stat, timer etc
are calling for heat and turn on the mains electrical supply.
4. Slacken the test point sealing screw and connect a
pressure gauge (Fig. 31).
5. Hold in the grey button on the gas control valve (Fig. 29),
press the piezo igniter button and release (Fig. 28). Repeat
until the pilot lights. Hold in the grey button for a further 15
seconds (Fig. 29).
6. The pilot should remain alight. If not, turn the grey button
clockwise and wait 3 minutes before repeating the
sequence.
7. The pilot side flame should be without a yellow tip and be
5
approximately 16mm ( / in) long. The pilot upper flame
8
should be approximately 25mm (1in) long. It is not possible
to adjust the pilot.
8. Operate the burner by turning the boiler thermostat knob
to the HIGH setting and check the operation of the flame
failure device by turning the grey button clockwise. The
burner and pilot should extinguish.
9. Turn the boiler thermostat to the "O" position, wait 3
minutes and relight the pilot as previously described.
10. Operate the burner and allow the system to reach
normal operating temperature. Make further checks for leaks
and check the burner setting pressure, adjusting if
necessary. This is done by removing the governor cover
screw and adjusting the governor in either direction as
required.
11. Remove the pressure gauge and tighten the pressure
test point sealing screw.
12. The boiler and system should be run and then flushed
and treated in accordance with BS7593: 1992 and the
flushing agent/inhibitor manufacturers instructions. When all
the air has been removed from the water circuit, the pump
and radiators should be balanced to achieve the design
temperature drop across the system.
13. Recheck the system for leaks. Turn the boiler
thermostat to the required setting.
14. Carefully read and complete all sections of the
"Benchmark" Installation, Commissioning and Service
Record Log Book that are relevant to the appliance and
installation. The details of the Log Book will be required in
the event of any warranty work. The Log Book must be
handed to the user for safe keeping and each subsequent
regular service visit recorded.
18