ST-85 – USER'S MANUAL
II.h) Operation Mode
With this function, you can select one out of four operation modes.
II.h.1) House Heating
If you select this option, the regulator will switch to the house heating
mode. The central heating pump starts to run above the pump activation
temperature (set to 35
O
C by default). Below this temperature (minus central
heating hysteresis), the pump is shut off. While in the house heating mode,
the icon is displayed in the up right corner of the main screen.
II.h.2) H.C.W. Priority
Activating the hot consumption water priority will cause the regulator to
switch into the water heater priority mode. In this mode, the (hot
consumption water) heater pump is activated until the set H.C.W.
temperature is reached. Then, the H.C.W. pump is shut off and the C.H.
pump is activated. The central heating pump will run until the water heater
temperature drops below the setpoint value (and the H.C.W. hysteresis);
then, the C.H. pump is shut off and the H.C.W. pump is activated.
In this mode, the fan is operated as long as the temperature is below 62°C
to prevent the boiler from overheating.
The hot consumption water priority function consists in that the
consumption water is heated up before heating up water in radiators.
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H.C.W. Pump Activation
Operation Mode
House Heating *
H.C.W. Priority
House Heating
H.C.W. Priority *
42
O
c | 55
O
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