43
Notes on electrical installation
– The terminals accept the following
maximum cable cross sections
:
stranded wire 1.5 mm
2
, solid copper wire 2.5 mm
2
.
– All connecting cables and strands must be led mandatory through the
two snap ferrites SF located directly before the control unit. Please
observe the instructions provided with the snap ferrites.
Electrical installation of centralized systems
The electrical installation of centralized systems includes (also see wiring
dia gram):
Designation/Description
Cable specification
Connection of the
power supply
to terminal X1. The
service switch Q
and
the
fuse F2
are mandatory.
Caution!
Make sure the voltage indicated on the rating plate meets the local
line voltage. Otherwise, do not connect the control unit.
min. cross section 1,5 mm
2
Connection of the
external safety circuit
(maximum humidistat, flow control,
release circuit, etc.) to terminal X21.
Important!
If no moni toring devices are connected to terminal X21, a jumper
(J1) must be installed to the terminal.
min. cross section 0,5 mm
2
Connection of an
external controller or humidity sensor
to terminal X25.
(admissible signal values see chapter 8.1 “Specifications”).
The shielding of the control signal must be connected to terminal X25/3.
Cau-
tion!
If the shielding of the control signal is
already connected to a po ten tial
or a grounded conductor, do not
connect it to terminal X25/3.
shielded cable
min. cross section 0,25 mm
2
Electrical installation of decentralized systems
The electrical installation of decentralized systems includes (also see wir
ing diagram):
Designation/Description
Cable specification
Connection of the
power supply
to terminal X1. The
service switch Q
and
the
fuse F2
are mandatory.
Caution!
Make sure the voltage indicated on the rating plate meets the local
line voltage. Otherwise, do not connect the control unit.
min. cross section 1,5 mm
2
Connection of the
booster pump
to terminal X1.
min. cross section 1,5 mm
2
Connection of the
external safety circuit
(maximum humidistat, flow control,
release circuit, etc.) to terminal X21.
Important!
If no moni toring devices are connected to terminal X21, a jumper
(J1) must be installed to the terminal.
min. cross section 0,5 mm
2
Connection of the
solenoid valves Y6-Y8
(on connector box) to termi
nal X22.
min. cross section 0,5 mm
2
Connection of
minimum pressure switch PS2
(on booster pump),
maximum
pressure switch PS3
(on connector box), and
excess temperature switch
of booster pump TS2
(on connector box) to terminal X23.
min. cross section 0,5 mm
2
Connection of the
conductance sensor LF
(on connector box) to terminal
X23.
Important!
For accurate measurements of the conductance the shielding must
be connected to the terminal X23/7.
shielded cable
min. cross section 0,25 mm
2
