Yeoman YM-CL8HB - Manual (Page 31)

31
COMMISSIONING
1.1 To commission:
— Replace the log retainer.
— Check the door alignment and catch operation, adjust if
required (see Maintenance & Servicing, Section 7,
Adjusting Door Hinges).
— Check the soundness of door seals, castings and joints.
— Check the operation of the air controls.
— Ensure the system has been filled with water and
includes a suitable inhibitor.
1.2 Now carry out a final smoke draw test:
— First warming the flue with a blowlamp, or similar, for
about 10 minutes.
— Place a smoke pellet on the centre of the grate, with the
air controls open.
— Close the door. Smoke should now be drawn up the flue
and be seen to exit from the flue terminal.
— Complete test with all doors and windows closed in the
room where the appliance is fitted.
— If there are any extractor fans in adjacent rooms, the test
must be repeated with the fans running on maximum
and interconnecting doors open.
— Check the effect of ceiling fans during the test.
If the test fails, re-check the suitability of the flue system
and ventilation. An inadequate air supply to the room is
potentially dangerous.
— Light the appliance and slowly increase the temperature
to operating levels.
— Ensure no combustion products enter the room.
— Open the main fire door when the appliance reaches
operating condition and carry out a spillage test with a
smoke match or pellet around the door opening.
— Run the system up to temperature.
BALANCING THE SYSTEM
It is essential to balance the central heating system in order
to achieve an even heating performance across all of the
radiators in the house. Balanced means each radiator having
a 10˚C difference in temperature between the flow and the
return, ideally 80˚C flow and 70˚C return.
Have the system running and adjust the appliance
thermostat so that the flow temperature measured near
the appliance is approximately 80˚C. Ensure that all valves
including lock-shield valves are in the fully open position
and the pump is at its estimated correct speed. If there are
thermostatic radiator valves, have these on maximum setting
and ensure that they do not activate.
Ensure that the radiators have been bled of air.
Write down the return temperature of each radiator in turn
and its difference to the flow temperature at the appliance.
Make sure that the flow temperature remains constant.
The radiator with the greatest difference (the index radiator)
and any other radiator within 1 degree should be left with
the lock-shield fully open. The remainder of the lock-shield
valves should be closed to about 1/3 open. Leave the
system to stabilise, this could take some time.
COMMISSIONING
When the system has stabilised, write down the new
difference between the flow and return temperatures and
any which differ from the index radiator by more than 1
degree will need further adjustment, some valves will have
been closed too much and others not enough, usually the
adjustments need to be only a fraction of a turn at a time.
Leave sufficient time for the system to stabilise after each
adjustment.
When the radiator temperatures are starting to become
consistent, but before final adjustments, the index radiator
needs to be considered, if the return temperature of this
radiator is not near 70 degrees then the pump will need
to be adjusted to either provide more (to increase the
temperature) or less flow to decrease the temperature.
Again, sufficient time will need to be left to allow the system
to stabilise after adjusting the pump speed.
When the radiator flow and return temperatures are correct
the final adjustments can be made and the lock-shield
covers replaced.
Knowing how far to shut down a valve to get the desired
change in flow and return temperature, and knowing how
long to wait for the system to stabilise, takes a little time and
practice.
1.3 If excessive spillage occurs:
— Allow the appliance to cool and re-check the flue system
and ventilation.
1.4 Finally:
— Explain the safe operation of the appliance and the
use of the controls to the user and the importance of
only using suitable fuels.
All open flued appliances can be affected
by temporary atmospheric conditions which
may allow fumes to enter the house. Because
of this it is recommended that an electronic carbon
monoxide detector conforming to BSEN50291
be fitted and maintained.
— Explain the cleaning and routine maintenance
requirements.
— Explain the requirement to use a suitable fireguard
when children, elderly or infirm persons are near the
appliance.
—
Record dealer/supplier and installer details in
Appliance Commissioning Checklist (page 3,
Instructions for Use).
—
Record serial number in Appliance Commissioning
Checklist (page 3, Instructions for Use). This number
is required when ordering spare parts and
making warranty claims.
— Give the copy of the Instructions to the customer.