ST – 480
II.9.d) Summer mode
Once this function is activated the central heating pump will be off and the
DHW pump will turn on above the preset activation temperature (see Section
III.h) and will work continuously until the temperature drops below the
activation temperature by the hot water hysteresis value or until the following
conditions are met:
(boiler temperature) + 2°C ≤ (boiler tank temperature)
In summer mode you only enter the set-point temperature of the boiler,
which is also understood to mean the set-point temperature of the boiler
tank.
II.10. Sustained operation
This option is used to set simultaneously the feeder and blower
operating time while the boiler is in the sustain mode.
II.11. Sustain pause
The sustain pause function is used to set the break time in fuel
feeding in the sustain mode. Inappropriate selection of working and
pause times may result in further temperature rise or unintended boiler
shutdown or even lead to conditions where the fuel in the fuel tank gets
fired.
II.12. Fan in sustain mode
The option allows selection of appropriate working and pause times
during the fan operation in sustain mode.
II.15. Room temperature reduction
After the room controller reaches the preset temperature, the preset
boiler temperature (set in the installer menu - see Item III.16) will drop
by the value set there. The reduced temperature will not be lower
however than the minimum preset central heating temperature.
Example: Temperature preset on the boiler: 55ºC
Room temperature reduction: 15ºC
Minimum temperature set on the boiler: 45ºC (factory setting)
Once the preset room temperature is reached (signalled by the room
controller) the temperature preset on the boiler will drop to 45ºC i.e. only
by 10ºC although the room temperature reduction is 15ºC. At the same
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