5
Combi 70 & Combi 90 Oil Boilers
To ensure that the hot water performance is not
reduced first thing in the morning, or in the evening
if the heating is off through the day, set the heating
timer to switch the heating on at least 30 minutes
before hot water will normally be required in the
morning (or evening).
When setting the times for the 'on' periods it is useful
to remember that it might take up to an hour for the
house to become warm, especially in colder weather.
Also the effect of the central heating will remain for a
time when the central heating is turned off.
Do not forget that if you require central heating during an
'off' period, simply set the Heating switch to CONSTANT,
remember the switch must be reset to TIMED at a later
time for the timer to return to your pre-set periods.
1 Control switches - Refer to section 1.3.
2 Boiler thermostat - This control allows
adjustment of the temperature of the water leaving
the boiler to heat either the radiators or the hot
water, via the hot water heat exchanger.
The boiler thermostat has an operating range of 75
to 85°C. For optimum hot water operation, ensure
this is set to at least 80°C.
3 Burner Lock-out reset button - If there is a
burner malfunction, a built-in safety circuit
switches the burner off and the Lock-out reset
button will light. Usually such malfunctions are
short lived and pressing the reset button will
restore normal operation.
If the burner continually goes to 'Lock-out' a fault
exists or the fuel supply is low. If you have sufficient
fuel, you will need to call your Service engineer.
4 Overheat thermostat - Your boiler is fitted with
safety overheat thermostat which will automatically
switch off the boiler in the case of a control malfunction
causing overheating. A red neon (see Fig. A) will light
indicating the thermostat has operated.
If your boiler goes off and you try to light it but
nothing happens and the 'Lock-out' reset button on
the burner is not lit, the overheat thermostat has
probably operated. The boiler will not light until
the thermostat is reset. To reset, unscrew the small
plastic cap (see Fig. A), press the button then
replace the cap.
If this condition continually repeats, contact your
Service engineer.
5 Ventilation - Always ensure that the boiler has
adequate ventilation. Any ventilation openings
provided by the Installer must not be obstructed.
Periodically check that they are clear.
Do not attempt to 'box in' the boiler or build a compartment
around it before consulting your Installer.
Do not place any combustible material around or
on the boiler or flue pipe.
6 Flue terminal - The flue terminal on the outside
wall must not be obstructed or damaged.
In severe conditions check that the terminal does
not become blocked by snow.
7 Frost protection - Your Installer may have fitted a
frost thermostat. If not, and you are likely to be away
for a short time, leave the boiler on with the boiler
thermostat set at a low setting. For longer periods the
boiler and system should be drained. Contact your
Service engineer for draining and filling the system.
8 Cleaning and servicing - Lightly wipe over the
case with a damp cloth and a little detergent. Do
not use abrasive pads or cleaners.
You should have your boiler serviced at least once
a year to ensure safe and efficient operation.
Contact your Service engineer for further details.
9 Failure of electricity supply - If the electricity
supply fails, the boiler will not operate. It should
relight automatically when the supply is restored.
The boiler will operate on either Class C2 Kerosene or
Class D Gas Oil to BS 2889:1998. Your Installer will
have informed you of the type of fuel your boiler has
been set to use and he will have marked this on the
boiler data label. You should always quote the type of
fuel you require when ordering from your supplier.
Note: Low level balanced flue installations (flue
terminal through the wall) must only be used with
Kerosene.
Do not wait until the fuel runs out before you order
some more. Sludge in the bottom of the tank may be
drawn into the fuel lines. If it is possible, switch off the
boiler when the new supply is delivered and leave the
fuel to settle for an hour before restarting the boiler.
The boiler requires a 230/240 V ~ 50 Hz supply. It
must be protected by a 5 Amp fuse.
Warning: This appliance must be earthed.
1 - USER INSTRUCTIONS
Useful tips
1.9
General notes and care of your system
1.10
About your fuel
1.11
Electricity supply
1.12
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