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221899A
6 Commissioning
6.4 Testing - Electrical
Turn the boiler temperature control knob fully clockwise to the
maximum setting, which is about 82
o
C (180
o
F).
The lighting sequence is automatic as follows:
The fan operates and after a short period of time, the spark
ignition operates, the solenoid opens, then the burner will light
shown by the "Burner On" neon on the control panel lighting up.
The burner will stay alight until switched off, either by the
temperature control or a remote system control.
To make sure that the flame supervision device is working
correctly the following should be done.
With the burner alight, turn the gas service cock “Off”, see
diagram 6.2.
After a short period the burner will go out.
The correct working of the flame supervision device is shown by
the “Burner On” neon going out and the ignition sequence
starting up.
After a short period the boiler will shut down.
If the above does not happen, refer to fault finding Section 9.
To carry on turn the gas service cock “On”, see diagram 6.2.
To re-start the lighting sequence, turn the temperature control
knob to “0” then fully clockwise to Max.
During normal operation when the boiler switches “Off”, the
burner will go out. The automatic lighting sequence will work
again when heat is required.
6.5 Testing - Gas
With the boiler on proceed as follows:
Undo the screw which secures control box, see diagram 5.10,
Open control box, see diagram 5.10.
WARNING. The multifunctional control and fan operate on
mains voltage, terminals will be live.
Test for gas soundness around the boiler gas components
using a suitable leak detection fluid, in accordance with the
current issue of BS6891.
Check the burner gas pressure at least 10 minutes after the
boiler has lit, refer to Data Label.
If necessary remove cap and adjust the gas pressure to obtain
the required setting turning screw clockwise, to decrease
pressure, see diagram 6.2.
Replace cap.
Should any doubt exist about the gas rate, check it using the gas
meter test dial and stop watch, at least 10 minutes after the
burner has lit, making sure that all other gas burning appliances
and pilot lights are off.
The gas rates shown in Table 2 are for guidance only, dependent
on the heat setting.
Turn the temperature control knob fully anticlockwise to “0”.
Isolate from the electrical supply.
Remove the pressure gauge from the test point and refit screw,
making sure a gas tight seal is made.
Refit control box and fascia.
Note: The fixing holes of the fascia are slotted to allow fine
adjustment to align control cover with casing.
When the temperature control is turned to the “0” position, by
hand, wait at least 30 seconds before turning On again.
There may be an initial smell given off from the boiler when new,
this is quite normal and it will disappear after a short period of
time.
6.6 Testing - All Water Systems
Allow the system to reach maximum working temperature and
examine for water leaks.
There should be no undue noise in the system.
The boiler should then be turned off and the system drained off
as rapidly as possible, whilst still hot.
Refill system.
6.7 Open Vented System
Ensure there is no pumping over of water or entry of air at the
open vent above the feed and expansion cistern.
6.8 Adjustment - Fully Pumped Open Vented
and Sealed Water Systems
When commissioning the system the boiler should first be fired
on full service, that is, central heating and domestic hot water.
Adjust the pump to the system design setting then balance the
system, making adjustments as necessary. .
6.9 Thermostatic Radiator Valves
If thermostatic radiator valves are fitted care must be taken to
ensure that there is an adequate flow rate through the boiler
when they close, refer to the current issue of BS7478 for
guidance. If fitted to all radiators ensure a bypass is fitted and
adjust to achieve a temperature difference no greater than 20
o
C
between flow and return with the thermostatic valves closed.
6.10 Completion
Adjust the boiler temperature control and any system controls to
their required settings.
Instruct and demonstrate the safe and efficient operation of the boiler, heating system and domestic hot water system.
Advise the user, that to ensure the continued efficient and safe operation of the boiler it is recommended that it is checked and serviced
at regular intervals. The frequency of servicing will depend upon the particular installation and usage, but in general once a year
should be enough.
Draw attention, if applicable, to the current issue of the Gas Safety (Installation and Use) Regulations, Section 35, which imposes
a duty of care on all persons who let out any property containing a gas appliance.
It is the Law that servicing is carried out by a competent person.
Advise the user of the precautions necessary to prevent damage to the system and building in the event of the heating system being
out of use during frost and freezing conditions.
Reminder - Leave these instructions and the “Benchmark” logbook with the user.
7 Instructions to the User
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