De Dietrich SLA2 Manuel page 32

SLA2
Heating circuit - raising the return temperature
A
ON
1 2 3 4
OFF
C
Use ground clamp collective terminal
strip!
If the temperature difference ∆T between store sensor S1
and heating circuit return sensor S2 exceeds the tempera-
ture difference adjusted at the controller, the 3-way-valve is
ON
switched-over.The return temperature of the heating circuit
1 2 3 4
is raised by the heat of the store so that less conventional
OFF
energy is necessary to reach the required flow temperature;
in the course of this the temperature difference is reduced.
Heat exchange
(between two stores)
A
ON
1 2 3 4
OFF
C
Use ground clamp collective terminal
strip!
If the temperature difference ∆T between store (1)- sensor
S1 and store (2)- sensor S2 exceeds the temperature adjus-
ON
ted at the controller, the circulation pump is switched-on.
Heat is transported from the store (1) into store (2); in the
1 2 3 4
OFF
course of this the temperature difference is reduced.
| 8
S1
If the adjusted temperature difference is underrun by a dif-
ference of 1,6 K (hysteresis, cannot be changed), the valve is
switched to initial position.
S1 = store sensor
S2 = heating circuit reverse sensor
RO = 3-way-valve
S1
R0
If the adjusted temperature difference is underrun by a dif-
ference of 1,6 K (hysteresis, cannot be changed), the pump
is switched-off again.
S1 = store (1) sensor
S2 = store (2) sensor
RO = circulation pump
1 2 3 4 7 8 9 10 11
S1 S2 RO RC N N L
S2
RO
1 2 3 4 7 8 9 10 11
S1 S2
RO RC N N L
S2