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1.3 Turning ON and OFF
Ignition
• Open the gas isolation valve on the boiler.
• Purge the gas supply taking the necessary precautions.
• Turn on the electrical switch at the 3amp switched fused spur.
• The boiler is now ready to function automatically whenever the external controls are calling for
heat.
Turning off
Press the
key for 5 seconds (see fi g. 1).
When the boiler is turned off with this key, the printed circuit board is still powered, heating operation
is disabled and the display appears
Close the gas isolation valve under the boiler and disconnect electrical power.
To avoid damage caused by freezing during long shutdowns in winter, it is advisable to drain all
water from the system.
1.4 Adjustments
Room temperature adjustment (Via room thermostat )
Using the room thermostat, set the temperature desired in the room. Controlled by the room thermo-
stat, the boiler lights and heats the system water to the set system delivery setpoint temperature. The
boiler turns off when the desired temperature in the rooms is reached, it will re-light when the room
temperature falls below the setpoint level, providing there is still a demand from the time clock.
Heating temperature setting
To set the system delivery temperature, turn the knob (ref. 1 - fi g. 1). It can be varied from a minimum
of 30 °C to a maximum of 90 °C.
Turning the knob sets the required temperature (clockwise to increase, anticlockwise
to decrease) that is shown on the display. During the setting, the display quickly
fl ashes and once defi ned it stops fl ashing after 2 sec. and reverts back to showing
the actual operating temperature.
Summer/Winter selection
To select Summer/Winter, use knob 1 (fi g. 1).
Turning it onto
Turning it onto
If the boiler is also used for hot water production do not select the summer position as this will
disable both heating and hot water modes.
6
the frost protection will remain active.
(Summer) turns off the heating function but the frost protection stays active.
(Winter) turns on heating, via the time clock and room thermostat.
Optimax 25 OV
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