Art.-Nr. 907.75.02.00
Stand 10/2019
- 15 -
GB
5.4.4
Circulation connection (optional)
Circulation is connected to the station1 (master) and adjusted via the master.
For this purpose, observe the separate operating instructions for the control unit.
5.4.5
Return flow circuit connection
With FRIWA 65 cascade the return flow circuit is connected using two zone valves. They are
installed and connected so that the buffer return is directed to the lower storage tank when
de-energised.
Both zone valves are connected to the same terminals (parallel).
Install the
zone valve 1
servomotor to the valve so that the valve is
closed when de-
energised
.
Install the
zone valve 2
servomotor so that the flow is
open when de-energised
.
For this purpose, also take into account the assembly instructions of the zone valve and ser-
vomotor.
The return circuit (valves including associated temperature sensors) is connected to station2
(slave1) and and adjusted using station1 (master).
When using the return flow circuit, we recommend merging the connection in a separate
connection box.
For this purpose, observe the separate operating instructions for the control unit.
