Combi 70 & Combi 90 Oil Boilers
4
1 Ensure that - There is sufficient fuel in the supply
tank and all fuel supply valves are open, the water
supply is on, the electricity supply to the boiler is
off, the Boiler On/Off switch is set to OFF, the
Heating switch is set to TIMED, the black pointer
on the pressure gauge is not below the red pointer,
the room thermostat (if fitted) is at the desired
setting and the timer is correctly set.
2 Switch on the electricity supply to the boiler.
3 Set the On/Off switch to ON (the green neon will light).
4 The boiler will light automatically to heat the water
stored in the boiler.
If the timer is set to an 'on' period the boiler will
continue to run to provide central heating. If a hot
tap is opened the boiler will supply hot water.
For short periods - Set the On/Off switch to OFF.
To restart, simply set the switch to ON.
For long periods: Set the On/Off switch to OFF and
switch off the electricity supply to the boiler. If
required, the fuel supply valve may be closed and the
water and electricity supplies turned off at the mains.
To restart, refer to the full lighting instructions above.
1 Check that the boiler On/Off switch is set to ON.
2 Check that the timer is working and is in an 'on' period.
3 Check that all thermostats are set to the desired
setting and are calling for heat.
4 Check if the burner 'Lock-out' reset button is lit. If it
is, press it to start the burner. If the burner fails to light
and goes to 'Lock-out' again, check that you have
sufficient fuel in the storage tank and that the fuel
supply valve is open.
5 Ensure that a fuse has not blown or that the
electricity supply has not failed.
6 Check to see if the safety thermostat has operated (see
note 4 in section 1.10).
7 Check that the black pointer on the pressure gauge
is not below the red pointer.
If the burner still fails to light after carrying out these
checks then a fault exists. Switch off the electricity
supply to the boiler and contact your Service engineer.
The boiler will supply domestic hot water whenever a
hot tap is opened, providing the Boiler On/Off switch
is set to ON.
The flow of water from the taps (hot or cold) depends
upon the mains water pressure, and in some homes it
may not be possible to use more than one tap at the
same time.
The boiler operates on a sealed central heating system
which will have been pressurised by your Installer. He
will have set the red pointer on the pressure gauge (see
Fig. A), to indicate the system pressure (when cold).
Do not adjust this pointer. The black pointer indicates
the actual system pressure which will increase slightly
when the boiler is operating. If the black pointer falls
below the red pointer (when the boiler is switched off
and cold), you should contact your Service Engineer to
re-pressurise the system. If the system requires
frequent re-pressurising, ask your Service Engineer to
check the heating system for leaks.
The boiler is fitted with an automatic air vent which
removes air trapped in the boiler. Any air trapped in
the radiators needs removing by venting the radiators
using the vent screw at the top of the radiators. Only
vent a radiator if the top is cool and the bottom is hot.
Excessive venting will reduce the system pressure, so
only vent when necessary and check the system
pressure as mentioned above.
Note: Your sealed system may incorporate a 'Top-Up'
vessel, advice on how to use it should be obtained
from your Installer.
The temperature of the water leaving the boiler to the
radiators can be increased by turning the boiler
(heating) thermostat (see Fig. A) clockwise.
With the Heating switch set to TIMED, the boiler will
provide central heating whenever the timer is in an 'on'
period and the room thermostat (if fitted) is calling for
heat.
For summer time operation, when central heating is not
required, set the Heating switch (see Fig. A) to HOT
WATER ONLY.
Lighting your boiler (see Fig. A)
1.4
1 - USER INSTRUCTIONS
Turning off your boiler (see Fig. A)
1.5
Points to check if burner fails to light
1.6
Domestic hot water system
1.7
Central heating system
1.8
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