11
6
ROOM THERMOSTAT
A room thermostat may be fitted for control of the central heating
temperature. It will be located in one room of the home. The method
of setting a room thermostat varies with the type and manufacture.
Refer to the instructions supplied with the room thermostat.
PROGRAMMER/CLOCK
A programmer or clock may have been fitted to the system: the
method of setting varies with the type and manufacturer.
Refer to the instructions supplied with the control.
THERMOSTATIC RADIATOR VALVES
If thermostatic radiator valves are fitted to the system then they
must conform to the requirements of BS2767. The radiator located in
the room where the room thermostat is sited must be controlled by a
thermostatic radiator valve.
VENTILATION OF ROOM SEALED FANNED
FLUE (RSF) APPLIANCES
These appliances do not require air flow for combustion from the
room in which they are installed. Any cooling ventilation openings in
a wall or door must not be obstructed. Do not allow the flue terminal
fitted on the outside wall to become obstructed or damaged.
NOTE: Do not place anything on top of the appliance. If the
appliance is fitted in a compartment do not use the compartment for
storage purposes unless it conforms to the requirements of
BS 6798:1987: Section 6. It is essential that the airing space is
separated from the boiler space by a perforated non-combustible
partition as described in BS 6798:1987.
If the clearances are less than shown for an unvented compartment
then the compartment must be ventilated in accordance with BS5440.
FLUE TERMINAL
Do not allow the flue terminal fitted on the outside wall to
become obstructed or damaged.
CIRCULATING PUMP
The heating system will be filled with a circulating pump which
may be fitted with a speed adjuster. If so it will be set by the installer
to suit the heating load. Do not alter the setting.
10
INDICATOR LIGHTS
Boiler demand : System is calling for heat
Burner ON : Burner is firing
Lock-out : There is a fault condition
Steady light - Overheat
Flashing light - Flame failure
TO LIGHT THE APPLIANCE
Check that the water valves to the central heating circuit are open.
Check that the needle on the pressure gauge is not below the
required pressure - sealed system only.
Switch on the mains electricity. Set the room thermostat, if
fitted, to maximum. Turn the boiler temperature control fully
clockwise to the maximum position.The burner will light. Set the
boiler temperature control and the room thermostat/cylinder
thermostat, if fitted, to the desired temperature.
TO STOP THE APPLIANCE
For Short Periods
Turn the boiler temperature control fully anti-clockwise to the
‘O’ position.
For Long Periods
Turn the boiler temperature control switch to the ‘O’ position.
Switch off the mains electricity.
Any programmer will require resetting if mains supply has been
disconnected.
ELECTRICITY SUPPLY
FAILURE
If the electricity supply fails the appliance will not operate.
Once the supply is restored the appliance will return to normal
operation.
Check that the settings of any programmer or time control
have been maintained.
7
FROST PRECAUTIONS
If the appliance is not to be used for a long period of time and
there is a likelihood of freezing, then the appliance should be drained.
The Worcester Technical Helpline will advise you on suitable frost
precautions. The boiler has an in-built frost thermostat which will
protect the appliance should the temperature of the boiler drop below
approximately 10°C.
SERVICE
Annual servicing is important in order to ensure continuing
high efficiency and long life for your appliance. In the event of any
difficulty in making suitable servicing arrangements, Worcester
personnel or other competent persons will discuss regular servicing
arrangements and offer a comprehensive maintenance contract.
WARNING
If a gas leak exists, or is suspected, turn off the gas supply to the
appliance at the service cock on the meter and consult your local
service engineer.
Do not touch any electrical switches to turn them either on or off.
Open all windows and doors. Do not smoke. Extinguish all naked lights.
CLEANING
Do not use abrasive cleaners on the outer casing. Use a damp
cloth and a little detergent.
APPLIANCE LOCKOUT
The appliance can be reset by turning the boiler temperature
control fully anti-clockwise and back. Check that the gas supply has
not been interrupted.
If this condition continues to occur, then call a service engineer.
TO LIGHT AND STOP THE
APPLIANCE
