Samson TROVIS 5575 - Deactivation Depending on Outdoor Temperature; OT Deactivation Value in Rated Operation; OT Deactivation Value in Reduced Operation; OT Activation Value in Rated Operation

5.4 Deactivation depending on outdoor temperature
5.4.1 OT deactivation value in rated operation
If the outdoor temperature exceeds the limit entered in OT deactivation value in rated opera
-
tion
, the heating circuit concerned is put out of service immediately. The valve is closed and the
pump is switched off after t = 2 x valve transit time. Heating operation is restarted immediately
when the outdoor temperature falls below this value (less 0.5 °C hysteresis).
With the default settings, this means that, during the warm season, the system is switched off at
an outdoor temperature of 22 °C.
Parameter
WE Parameter level / Range of values
OT deactivation value
in rated operation
22 °C PA1, 2 / 0 to 50 °C
5.4.2 OT deactivation value in reduced operation
If the outdoor temperature exceeds the limit value OT deactivation value in reduced operation ,
the heating circuit concerned is put out of service immediately. The valve is closed and the
pump is switched off after t = 2 x valve transit time. Heating operation is restarted immediately
when the outdoor temperature falls below this value (less 0.5 °C hysteresis).
With the default settings, this means that, at night, the system is switched off at an outdoor
temperature of 15 °C to save energy. Nevertheless, remember that the system requires some
time in the morning to heat up the building.
Parameter
WE Parameter level / Range of values
OT deactivation value
in reduced operation
15 °C PA1, 2 / –20 to 50 °C
5.4.3 OT activation value in rated operation
If a heating circuit is in reduced operation (automatic operating mode), the circuit is auto
-
matically transferred to rated operation when the outdoor temperature falls below the limit
value
OT activation value in rated operation . When the limit value is exceeded (plus 0.5 °C
hysteresis), reduced operation is restarted.
This function is activated at very low temperatures to avoid that the building cools down ex
-
cessively outside the times-of-use when low outdoor temperatures occur.
Parameter
WE Parameter level / Range of values
OT activation value
in rated operation
–15 °C PA1, 2 / –20 to 5 °C
56 EB 5575 EN
Functions of the heating circuit