Yeoman YM-CL8HB manual Commissioning, Balancing The System, 1.4Finally, be fitted and maintained

COMMISSIONING

COMMISSIONING

1.1To 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.

1.2Now 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.

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.

1.3If excessive spillage occurs:

—Allow the appliance to cool and re-check the flue system and ventilation.

1.4Finally:

—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.

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