TO LIGHT AND STOP THE
APPLIANCE
TO LIGHT THE APPLIANCE
Check that the water valves to the central heating circuit are open. On sealed systems check that the grey needle on the pressure
gauge is not below the required pressure.
Switch on the mains electricity. The green power on indicator will light. Set the room thermostat, if fitted, to maximum. Turn the central heating temperature control knob to ‘MAX’. The red central heating demand indicator will light.
The burner will light and the red flame detection indicator will light. Set the central heating and hot water temperature control knobs
and the room thermostat, if fitted, to the desired temperature.
TO STOP THE APPLIANCE
For Short Periods
Turn the central heating temperature control knob fully anti- clockwise to the ‘ 
’ position.
For Long Periods
Turn the operating switch to the ‘ 
’ position. Switch off the mains electricity.
A facia mounted electronic programmer will retain its settings for about two weeks, after which it will return to the factory set
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| programme. The display will disappear |
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Fig. 3. CDi with front panel removed. |
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| after approximately 12 hours. | ||
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| A facia mounted mechanical | |||
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| programmer will require resetting once |
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| the operating switch has been set to ‘O’, |
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| or the mains supply has been |
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| disconnected. |
| ELECTRICITY SUPPLY |
| FAILURE |
| If the electricity supply fails the |
| appliance will not operate. Once the |
Expansion | supply is restored the appliance will |
vessel | return to normal operation. If a |
| programmer is fitted, check that the |
| settings have been maintained. |
| OVERHEAT |
Gas valve | THERMOSTAT |
| The appliance will enter a lockout |
| condition in the event of overheating. |
| An overheat |
| fitted to the appliance which will |
| interrupt the electricity supply to the gas |
| valve. |
| If the overheat |
| both the central heating and the hot |
| water demand indicators will flash |
| together. |
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