19
Electrical connection
Terminal S1: Cold water temperature sensor T
KW
Terminal S2: Primary temperature sensor T
Pri
Terminal S3: Circulation temperature sensor T
Zirku
The polarity of the DL bus connections (DL and "Earth") is
not
interchangeable and must be observed.
Safety instructions
If you are connecting the FRISTAR3 to an electrical system via a residual current device (RCD), use
an RCD of type A which will detect pulsating direct currents and bears the following marking:
Checking using a high voltage insulation tester may cause damage to the pump and the control elec
-
tronics.
Primary pump
Optional: Circulation pump
Fuse 3.15A
fast-acting
Temperature differential set
-
ting for circulation pump
Va
lv
e te
rm
in
al
PW
M
IN
|
P
W
M
O
UT
|
G
N
D
|
+
12
V
DL address for
DIP switches
Volume flow sensor
connection
0°C
25°C
