Commissioning the Unit - Page 9
Reference should be made to BS 5449: section 5 when
commissioning the boiler and system.
Flush the whole system in accordance with BS 7593:1992.
(See Treatment of Water Circulating Systems on page 4).
Check the system for leaks.
Turn the gas service cock fully anti-clockwise.
Purge the air from the gas service pipe in accordance with
BS 6891 and test for gas soundness.
Turn the boiler thermostat to the OFF position.
Ensure that all external controls e.g. room thermostat, timer,
etc., are calling for heat and turn on the mains electrical
supply.
Remove the test point sealing screw and connect a pressure
gauge.
Hold in the ON/OFF button on the gas control valve.
Press the piezo igniter button and release. Repeat until pilot
lights. Hold in the grey ON/OFF button for a further 20
seconds and then release. The pilot light should then remain
alight. If not, turn the grey button clockwise and wait 3
minutes before repeating the sequence.
The pilot flame should be without a yellow tip and be
approximately 25mm (1 in) long.
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 ON/OFF button clockwise. The
burner and the pilot should extinguish.
Turn the boiler thermostat to the OFF position. Wait 3
minutes and re-light the pilot as previously described.
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 adjusting the throttle screw (red plastic
surround) in either direction as required.
Remove the pressure gauge and tighten the pressure test
point sealing screw.
The boiler and system should be run and then flushed and
treated in accordance with BS 7593:1992 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.
Recheck the system for leaks.
Turn the boiler thermostat to the required setting.
Complete the assembly of the outer case as described in
‘Outer Case’ (Fig. 6).
9. 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.
Instruct the user in the use of the unit. Please leave these
instructions, the users instructions and the log book with the
user.
NOTE:
In the event of an electrical fault after the installation
of the appliance, preliminary electrical system checks must
be carried out (i.e. Earth continuity, polarity and resistance to
earth).
