Samson TROVIS 5500 Mounting And Operating Instructions page 88

Functions of the DHW circuit
Time-controlled switchover of storage tank sensors
By configuring a second storage tank sensor 2, it is possible to determine by setting the func-
tion block CO4 > F19 - 1 that the storage tank sensor 1 is used for day mode in the DHW
circuit and storage tank sensor 2 for night mode. As a result, different storage tank volumes
can be kept at a constant temperature according to a time schedule, and also at different
temperatures if the 'DHW temperature set points' for day and night differ from one another.
Stop storage tank charging
The controller stops charging the storage tank when the water temperature measured at stor-
age tank sensor 1 has reached the temperature T = 'DHW temperature' + 'Hysteresis'. When
there is no heating operation or when the flow temperature demand in the system is lower,
the corresponding valve is closed. The storage tank charging pump is switched off after t =
'Lag time of storage tank charging pump' x 'Valve transit time'.
With the default settings, the temperature in the storage tank is increased by 5 °C to reach
60 °C when the storage tank temperature falls below 55 °C. The charging temperature is cal-
culated from the DHW temperature (55 °C) plus the 'Charging temperature boost' (10 °C),
which equals 65 °C. When the storage tank has been charged, the heating valve is closed
and the charging pump continues to run for the time t = P06 x Valve transit time. Outside the
times-of-use, the storage tank is only charged when the temperature falls below 40 °C
('Night set point for DHW temperature'). In this case, the tank is charged with a charging
temperature of 50 °C until 45 °C is reached in the tank.
Functions
Storage tank sensor 1
Storage tank sensor 2
SLP depending on return flow temperature 0
Switchover
Parameters
Day set point for 'DHW temperature' or
charging temperature when
CO4 > F01 - 0
Night set point for 'DHW temperature'
Parameters
Min. adjustable DHW set point*
Max. adjustable DHW set point*
Hysteresis**
88
WE Configuration
CO4 > F01 - 1
CO4 > F02 (-1 with CO4 > F19 - 1)
CO4 > F15
0 CO4 > F19 (-1 only when CO4 > F02 - 1)
WE Switch position: value range
55.0 °C
: Min. to max. adjustable DHW set point
40.0 °C
: Min. to max. adjustable DHW set point
WE Parameters: value range
40.0 °C PA4 > P01: 5.0 to 90.0 °C
60.0 °C PA4 > P02: 5.0 to 90.0 °C
5.0 °C PA4 > P03: 0.0 to 30.0 °C
EB 5573-1 EN