Surge protection
The following measures must be taken if lines are installed outside of the building or over long
distances:
•
The shield of signal lines routed outside of buildings must have current carrying capacity
and must be grounded on both sides.
•
Surge diverters must be installed at the control cabinet inlet.
3.2 Connecting the controller
Connect the controller on the basis of the relevant terminal diagrams of the associated system
code numbers (Fig. 3 to 10).
The power supply section of the controller terminals 14 to 26 must be connected using wires
with a cross-section of 1.5 mm
2
at the minimum.
Knock out the holes marked on the rear casing for the cable entries and insert the enclosed self-
sealed grommets or suitable glands.
3.3 Connecting the sensors
Connect the cables with a cross-section of min. 0.5 mm
2
to the terminal strip terminals 1
to 13 on the rear casing. See chapter 7.1.4 for Pt100 (Pt1000/PTC) on sensor calibration.
3.4 Terminal wiring diagrams
Legend for circuit diagrams:
AF
Outdoor sensor
SLP
Storage tank charging pump
RF
Room sensor
UP
Circulation pump of heating circuit
RÜF
Return flow sensor
ZP
Circulation pump of drinking water circuit
SF
Storage tank sensor
WMZ Heat meter
VF
Flow sensor
Solar circuit:
TW
Drinking water circuit CF
Solar circuit collector sensor
HK
Heating circuit
CP
Solar circuit pump
2 PKT On/off
With 0
…
20 mA
50
Ω
connect in parallel
Fig. 3
System code no. 1
Option Type 5244
Type 5257-4
9
