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Wiring diagram
Power supply
400V / max.16A
Fan motor
2-speed / 400V
Thermal
contact
motor
Frost protection
thermostat
If several fans are operated simultaneously up to a
total capacity of max. 4 kW, the connection is made
via an external terminal distributor!
If several fans are operated simultane-
ously, connect all thermal contacts in in
a row!
Night
thermostat
Day
thermostat
SW 2.1 D switching unit
Rotary current 400 volt, fan 2-speed
maximum electrical capacity 4 kW
Wall-mounted, full motor protection through integrated
connections for thermal contact, connection terminals
for thermal contacts, room thermostats and frost protec-
tion thermostat.
Design
Plastic housing, protection type IP 65.
Protective insulation in accordance with VDE, front
plate with symbols for switching positions and operating
modes, power input and protective conductor terminals,
main contactor, speed selector with the functions
“Speed 1 / Speed 2“, control fuse, operating and mal-
function lights, operating mode switch with the functions
“Off / Release / Thermostat / Continuous Operation”,
control relay, terminals for the motor output, connection
terminals for the thermal contacts, room thermostats
and frost protection thermostats.
Functionality
The frost protection thermostat switches the fan off.
Switching on again after a problem
Each time the power supply is interrupted or the fan
malfunctions, the operating mode switch has to be reset
to “0/Release”!
Group switching
The switching unit is suitable for group switching. Sev-
eral motors wired the same way can be connected to
one switching unit.
The total capacity of the connected motors may not ex-
ceed the permissible switch capacity of the switching
unit. The thermal contacts of all motors are to be con-
nected in a row.
Important information about safe operation
Grounding and earthing or protective wiring and fuse
protection must be done by the customer in accordance
with the requirements of the VDE as well as the respon-
sible EVU.
The electrical unit connections must be performed by
authorised personnel in the line with the valid require-
ments in compliance with local laws and in accordance
with the wiring diagrams.
Thermal
protection for 2
units
Thermal
protection for 3
units
Thermal
protection for 4
units
Wiring diagram of the thermal contacts