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The operation of the boiler is controlled by the built in
programmer, it can be operated under automatic or
manual control. See section ‘PROGRAMMER’.
The temperature of the hot water supplied can be
adjusted by means of the boiler thermostat knob. This
knob can also be used to turn the boiler off.
To inhibit internal corrosion of the boiler heat exchanger it
is important not to operate the boiler below 60°C
An ideal setting for summer hot water; and to keep the
temperature above 60°C, can be achieved with a
thermostat knob setting midway between MAX and MIN.
The boiler thermostat knob is situated behind the control
door. (See Fig. 1). Turn the knob clockwise to increase
the temperature of the water.
For safety purposes an overheat thermostat is fitted. This
thermostat is a safety cut-out device which is intended to
operate if other controls fail. This control will “Lock-out”
and switches everything off except for the programmer
and the “pump overrun” facility.
This thermostat has to be manually reset once the
temperature has cooled down.
Should your heating/hot water system be of an unvented
design i.e Pressurised System. It is important not to keep
resetting the boiler safety cut-out as this may indicate a
loss of secondary water.
Check also you system pressure gauge.
To reset press the centre of the reset button (See Fig. 1)
with a small probe (pencil, ball point etc).
In the event of repeated failure switch off oil and electrical
supply to the appliance and contact your installer/service
engineer.
HOT WATER/HEATING AND HOT WATER SWITCH
SEE FIG. 1
Switch up to
‘HOT WATER’ - When hot water only is
(SUMMER USE) required.
Switch down to
‘HEATING/HOT WATER’ - When both central
(USUALLY WINTER USE) heating and hot water is
required.
NOTE: Some heating systems may have been installed
with a programmable room thermostat or additional
external controls in which case this switch is inoperative.
Please check with your installer.
FROST PRECAUTIONS
In the event of the water being OFF for long periods
during very cold weather, the advice of your installer
should be obtained.
THE BOILER
Fig. 1
DESN 516074
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