3
6. INDICATOR NEONS
When illuminated, the following conditions apply:-
Warning light (continuously on) - blocked flue or fan fault, contact your Service Engineer.
Electrical supply to the boiler is on.
Boiler is supplying hot water.
Boiler is supplying central heating.
7. OVERHEAT THERMOSTAT
This thermostat automatically switches the boiler off in the unlikely event of the boiler overheating. When the thermostat
operates, it turns the pilot off. If this continually happens, contact your Service Engineer.
8. PRESSURE RELIEF VALVE
If the central heating system overheats and steam or water is discharged from the pipe connected to this valve, turn the boiler
off and contact your Service Engineer. Your Installer should have told you where this pipe terminates.
9. FROST THERMOSTAT
The boiler has a built-in frost thermostat, which automatically operates the boiler if the water temperature falls below 5°C,
providing the electrical supply neon is illuminated and the pilot is alight.
4 LIGHTING INSTRUCTIONS
Refer to Fig. 1 for boiler controls.
1. Ensure the following:-
a. Electrical supply to the boiler is off.
b. All heating controls and thermostats are set to OFF or minimum position.
c. All isolation valves at the bottom of the boiler are in the open position (flats on the spindle in line with the valves).
d. The gas and water supplies are on at the mains.
e. The heating system pressure is within the green band as shown on the pressure gauge.
2. Turn the heating and hot water thermostats fully anticlockwise to 0 and set the selector switch to 0.
3. Switch on the electrical supply to the boiler.
4. Set any room thermostats to maximum and ensure that any clock is in an 'on' position. Refer to section 8, if a clock is fitted
in the boiler control panel.
5. Set the selector switch to (hot water only). The neon will illuminate, indicating the electrical supply to the boiler is on.
6. Fully depress the gas control and keep it pressed in. After a delay of about 20 seconds the ignition sparks will start and
the pilot will light. When the pilot lights (view through the window in the boiler case) keep the control pressed in for a
further 20 seconds then release. The pilot should remain alight.
If the pilot does not remain alight, release the control and turn it off in the direction of the arrow.
Warning: If the pilot is extinguished at this or any other time, wait at least 3 minutes before attempting to relight the boiler.
7. When the pilot remains alight:-
a. Turn the hot water thermostat fully clockwise. Open a hot water tap, the main burner will light and the boiler will provide
hot water. Close the tap and the burner will go out.
b. Set the selector switch to (central heating and hot water) and turn the heating thermostat fully clockwise. The
main burner will light and the boiler will provide central heating.
8. Set the boiler and all other controls, ie room thermostat etc, to the desired positions.
To turn the central heating off i.e. in Summer:- Set the selector switch to (hot water only).
To turn the boiler off for short periods:- Set the selector switch to (hot water only).
Note: In this position the pump will automatically operate for 5 minutes in every 24 hours. If the pilot is alight and the water
temperature falls below 5°C, the built-in frost thermostat will operate the boiler automatically until the temperature of the water
in the heating system has been raised.
To turn the boiler off for longer periods:- Set the selector switch to 0 and turn the gas control in the direction of the arrow.
This will turn off the pilot. Switch off the electrical supply to the boiler. If required, all supplies i.e. gas, water and electricity may
be turned off at the mains. If there is any possibility of the boiler being left during frost conditions, then the boiler and system
should be drained and a label attached to the boiler drawing attention that the system has been drained. If this is required,
contact your Service Engineer.
