Turning On And Off; Adjustments - Ferroli OPTIMAX 25 S Instructions For Use, Installation And Maintenance

1.3 Turning ON and OFF

Ignition
• Open the gas isolation valve on the boiler.
• Purge the gas supply.
• Turn on the electrical switch or insert the plug of boiler.
• 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 electronic card is still powered, heating operation is
disabled and the display appears
Close the gas cock ahead of 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 (with room thermostat on)
Using the room thermostat, set the temperature desired in the rooms. 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.
If the room thermostat or the remote control are not installed the boiler will keep the system at the set
system delivery setpoint temperature.
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 blinks
and once defi ned it stops blinking after 2 sec. and goes 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
turn this off also.
6
but the frost protection is still active.
(Summer) turns off the heating function but the frost protection stays on.
(Winter) turns on heating.
Optimax 25 S