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3.6 Electrical connection
Danger of electric shock!
Dangerous electric voltage!
All work relating to the electrical installation
may only be carried out by designated spe-
cialist personnel (electrician or qualified per-
son with equivalent training).
The customer is responsible for monitoring
the qualifications of the specialist personnel.
Potential component damage due to elec-
trostatic discharge!
To protect the sensitive electronic compo-
nents, measures to prevent damage due to
electrostatic discharge must be taken before
the start of the installation work.
3.6.1 Connection of control voltage
The control voltage of 230 VAC is to be
applied to the board which is closet to the
cable gland on the underside of the housing.
The plug designation differs depending on
the level of expansion:
The pin assignment is identical for all plugs. L
and N are labelled on the boards. The pins
are accessable via a terminal strip adaptor
pushed on the corresponding plug.
3.6.2 Connection of interlock (safety)
system
The so-called interlock (safety) system is
located between terminals 1 and 2. Safety
equipment can be wired (also in series) into
the interlock (safety) system. If the interlock
(safety) system is open, the humidifier
doenot start or the operation is interrupted.
In air conditioning, it is standard to incorpo-
rate a max. hygrostat in the interlock (safety)
system. The max. hygrostat is used as a
safety feature in case of a malfunction of the
humidity sensor.
Danger of electric shock!
Dangerous electric voltage!
After the initial operation of the unit, a
230VAC voltage is present at terminal 1
when standard wiring is used.
The interlock (safety) system is not closed
when delivered ex-factory!
The contacts, which are connected to termi-
nals 1 and 2 must be potential free and suit-
able for switching of 230 VAC.
Type of board
Plug designation
Mainboard
ST1
Expansion board
ST1.1
Relay circuit board
ST1.1
:$51,1*
3OHDVHQRWH
127,&(
127,&(
:$51,1*
2 1 L N
Terminal strip
on ST1 or
ST1.1
Terminals 1/2 on the mainboard (terminal strip on
ST1) or an extension/relay board (terminal strip on
ST1.1 provided for connection of the interlock
(safety) system
3OHDVHQRWH
3OHDVHQRWH
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