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 (Fig 7).
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).
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).
