Publication No. 5105702 3User'sGuide
To Shut Off - Short Periods
Turn the boiler thermostat knob to 'O' (OFF) or switch
the programmer to the 'OFF' position. To re-light the
boiler,simplyturn the boiler thermostat Onorswitch the
programmer'On'.
To Shut Off - Long Periods
Turn the boiler thermostat knob to 'O' (OFF), isolate the
electrical supply at the isolating switch, or pull the
electrical plug out of the wall socket.
Important: Read the section on Frost Precaution.
Note: If the system is fitted with a low limit thermostat
and protection of the system is required during cold
weather, all that is required is for the programmer to be
turned to the 'Off' position. This will allow the boiler to
cycle if the temperature within the house becomes too
low.
Important
Gas and electricity are required to operate your boiler.
Itsperformancewill not be affectedby normal variation
ineithersupply,butagasorelectricityfailurewillputthe
boileroutofoperation. It will automatically re-start when
the supply is restored provided that the time clock and/
or thermostats are in the 'On' position.
Note: In the event of your boiler not working, there are
several checks you should carry out before calling in a
Service Engineer, as this could save you unnecessary
expense.
1. Check that the gas, electricity and water are all
turned 'On' at the main supply points.
2. Check that the time control, if fitted, is in an 'On'
period.
3. Check that all the thermostats in the system are not
on low settings.
OverheatLimitThermostat
The boiler is fitted with a safety thermostat to protect
against overheating of the water. If this thermostat
operates the boiler will lockout and fail to re-light, allow
theboilertocoolandpress the reset button (
DoNotuse
excessive pressure
). Access to the button is through a
holeintheunderside of the controls cover, see drawing
on front of these instructions. If the control does not
reset, leave the boiler for approx. 15 minutes before
pressing the reset button again.
If the problem persists, turn off the boiler and consult
your Local Installer or Service Engineer.
Note: Interruption of the electrical supply to the boiler
may also cause the overheat thermostat to operate.
Having checked these points, run through the lighting
procedure once more and if the boiler still fails to light,
call in your Service Engineer.
FrostPrecautions
If your boiler has to be shut down for several hours or
more during very cold weather, it may be in danger of
freezing,duetoitsposition,i.e.itmaybeinanouthouse
or part of the pipework may be vulnerable to frost. To
avoid freezing, various methods of protection can be
used:-
1. Insulationoftheboiler and pipework, takingcarenot
to impede any ventilation or air supply.
2. Completelydrainingthewatersystemifnotinusefor
long periods. On a sealed system, draining and
refilling must be carried out by a competent person.
Note:Although the system can be emptied by using
thedrainofftapsinstalledinthe pipework around the
system, to empty the boiler, it is necessary to
removethedrain screw which is situatedonthe heat
exchanger casting. This should only be done by a
competentperson.
3. Have a low limit thermostat fitted. If the system is
fittedwitha low limit thermostat andprotection of the
system is required during cold weather, all that is
requiredisfortheprogrammertobeturnedtothe'Off
'position. This will allow the boiler to operate if the
temperaturewithinthe house becomes toolow. The
low limit thermostat will not operate if the boiler is
completely shut down and the electricity supply
turned off. In this instance, the system will have no
protection and one of the other methods must be
used.
4. Where no frost protection is provided it may be
necessarytoruntheboileratlowthermostatsettings
at all times when it would normally be shut off.
Cleaning the Outside of the Boiler Casing
The outside of the boiler casing can be wiped when
necessary by using a damp cloth to remove finger
marks etc. Do not use an abrasive cleaner as this may
damage the casing finish.
