11
Cascade switching
At most, a maximum of 4 FRISTAR fresh water stations may be used in parallel in cascade
switching.
The first module is fed directly, all others stations are added with stop valves, if necessary.
These valves must open or close in at least 30 seconds.
Valves are added via overriding controller with a volume flow sensor that measures the total
volume flow. Sensor FTS5-85DL is sufficient for up to three modules, sensor FTS9-150DL
must be used with 4 modules.
Because the sensors in the FRISTAR stations must never be loaded with more than 40 litres
per minute, the overriding controller must increase the number of stations in steps of approx.
8-10 l/min. This ensures that the sensors in the FRISTAR stations are not strained excessive-
ly. In the following “step-by-step“ instructions, the first stage with 9l/min was selected be-
cause sensor FTS9-150DL is activated properly starting at 9 l/min only.
A three circuit controller UVR61-3R (or UVR63) can switch the modules. Of course, the cas-
cade switching can also be integrated in the program of a UVR1611.
Hydraulic circuit diagram of a cascade with four FRISTAR fresh
water stations
Figure with fresh water stations version, version “Pump on the right“
The initial designations for stop valves
A1
–
A3
refer to controllers UVR61-3R or UVR63.
