13.Instructions To The User
13.1Tell the user how to operate the appliance and hand over the Users Instructions leaflet.
13.2Tell the user what to do if the heating system is not to be used in frosty weather.
13.3Tell the user the sealed system set pressure.
13.4Tell the user of the importance of regular servicing. Worcester Heat Systems Ltd. offer a comprehensive maintenance contract.
13.5Set the system controls to the userÕs requirements.
13.6If an external programmer has been fitted which has a programmable domestic hot water facility then it is suggested that this be set to Continuous or the equivalent.
Fig. 28. User controls.
Reset button
Mains indicator
System pressure gauge
C.H. temperature control and on/off knob
14.Inspection And Service
14.1SERVICING
To ensure continued efficient operation of the appliance it must be checked and serviced as necessary at regular intervals. The frequency of servicing will depend upon the particular installation conditions and usage, but once per year should generally be adequate. The extent of the service required by the appliance is determined by the operating condition of the appliance when tested by fully qualified engineers.
Any service work must be carried out by competent engineers such as British Gas or Corgi registered personnel.
14.2 PRE-SERVICE INSPECTION
Check that the flue terminal and the terminal guard, (if fitted), are clear.
If the appliance is in a compartment, check that the ventilation openings in the compartment door or walls are clear. See Section 6 - Air Supply.
Check the system and remake any joints or fittings which show signs of leakage.
Refill, vent and
For consistency of results of the flue gas measurements it is necessary to have a constant output and for the appliance to be at equilibrium.
Turn on a tap to create a hot water demand.
Wait until the appliance reaches thermal equilibrium (approx. 10 minutes).
Remove the test point sealing screw on the appliance top panel. See Fig. 30.
Connect to the test point with a piece of tubing. Expected measurements should be between: For Natural Gas:
Equivalent flue | Carbon | Carbon |
length (metres) | Dioxide (%) | Monoxide (%) |
|
|
|
0.5 | 6.9 | 0.0008 |
|
|
|
1.0 | 7.0 | 0.0009 |
|
|
|
1.5 | 7.1 | 0.0010 |
|
|
|
2.0 | 7.3 | 0.0012 |
|
|
|
2.5 | 7.4 | 0.0013 |
|
|
|
For Propane: |
|
|
Equivalent flue | Carbon | Carbon |
length (metres) | Dioxide (%) | Monoxide (%) |
0.5 | 7.9 | 0.0017 |
|
|
|
1.0 | 8.0 | 0.0020 |
1.5 | 8.2 | 0.0024 |
|
|
|
2.0 | 8.5 | 0.0030 |
2.5 | 8.8 | 0.0035 |
|
|
|
When calculating the equivalent flue length a flue bend is equivalent to 750mm of straight flue.
After taking the measurement replace and tighten the sealing screw.
IMPORTANT
Disconnect the electrical supply at the mains and turn off the gas supply at the gas service cock on the appliance before servicing.
After completing the service always test for gas soundness as indicated in BS 6891.
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