Operating Hours-Dependent Change (Anl 5 And 7); Change With Binary Input (Anl 4 To 7); Return Flow Boost - Samson TROVIS 5474 Mounting And Operating Instructions

Condition for change in lag/lead sequence

5.3.3 Operating hours-dependent change (Anl 5 and 7)

After a fixed amount of time has elapsed, counting in hours from the time when the last lag/lead
sequence took place ( Time interval for lag/lead sequence change) , the other boiler takes on the
role as lead boiler.
The elapsed operating hours since the last change in lag/lead sequence are shown in the InF5
level.
Functions
Automatic change in lag/lead sequence
Condition for change in lag/lead sequence
Parameter
Time interval for lag/lead sequence change

5.3.4 Change with binary input (Anl 4 to 7)

The binary input BE4 can be used for the change in lag/lead sequence when the DHW heating
is not being controlled:
4
BE4 = OFF: Boiler 1 as lead boiler
4
BE4 = ON: Boiler 2 as lead boiler
Functions
DHW demand – active
Automatic change in lag/lead sequence
Note!
In system Anl 7 the binary input BE4 can be used either for modulation feedback, for an exter-
nal demand for DHW or for an external change in lag/lead sequence.
5.4

Return flow boost

On fulfilling the criteria for activation (–> section 5.1) the return flow control circuit is closed at
the valve RK1/RK2. In the released boiler K1/K2 (see above), the first stage of the boiler and
the boiler pump Pu1/Pu2 is switched on. The water is circulated in the boiler circuit.
The return control circuit is released if the temperature at the sensor RüF1/RüF2 exceeds the
limit entered in Minimum return flow temperature. The mixing valve opens and release the cor-
ON Co5 -> Fb10 = OFF, select: 2
WE Configuration
ON Co5 -> Fb09 = ON
ON Co5 -> Fb10 = ON
WE Parameter level / Range of values
168 h PA5 / 1 to 999 h
WE Configuration
ON Co4 -> Fb00 = OFF
OFF Co5 -> Fb09 = OFF
Boiler functions
37
EB 5474 EN