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carried out by a qualified electrician who is responsible
for compliance with the existing standards and regula-
tions.
4.4.1
Connection data
– The voltage and frequency of the connection must
correspond to the values stated on the rating plate.
– Electrical connection and any repairs may only be
carried out by authorised specialist personnel.
Use only original spare parts!
– For 1~ and 24 V (DC) fans, install the pre-fuse pre-
scribed on the rating plate (circuit-breaker or slow
fuse) to protect against short-circuiting.
– With the rotary current variant, install the pre-fuse
prescribed on the rating plate or a circuit-breaker/
back-up protection to protect against short-circuiting,
and set it to the prescribed rating value.
– The direction of airflow and the direction of rota-
tion are each marked on the motor housing with an
arrow.
– If a phase is missing, the fan will not start. If the rota-
ry field is incorrect, the fan will run backwards.
4.4.2
Overvoltage protection and supply line
load
The unit does not have its own overvoltage protection.
Measures must be taken by the operator at the supply
end to ensure effective lightning and overvoltage pro-
tection. The mains voltage must not exceed a tolerance
of ±10%.
4.4.3
PE conductor connection
The PE conductor connection must be connected to
the PE conductor system of the overall system.
5
Carrying out the electrical con-
nection
5.1
Connecting the power supply
◾ Complete the electrical connection by following the
wiring plans.
Note:
For technical data, refer to the rating plate.
◾ Remove the red cover from the electrical connection.
Rittal fan-and-filter unit assembly and operating instructions
Carrying out the electrical connection
Fig. 3:
◾ Insert the connection cable with wire end ferrules into
the screwless spring terminals.
Choose an appropriate pre-fuse according to the line
cross-section (2 x 0.75 – 2.5 mm² multi-wire, 2 x 1.5
– 2.5 mm² fine-wire soldered).
◾ Re-attach the electrical connection
5.2
Rotating the voltage connection
If the position of the voltage connection is not ideally
accessible, it may be rotated through 90° and snapped
into position. To this end, press down on the release
button of the bayonet connection at the rear of the fan.
Units 3238.xxx to 3239.xxx are released by pulling out
the clip (see fig. 4) of the bayonet connection.
Fig. 4:
Units 3240.xxx, 3241.xxx, 3243.xxx to 3245.xxx are
released by pressing the release button of the bayonet
Access the electrical connection
Caution!
If no wire end ferrules are used, the
insulation of the individual wires should
be stripped to a max. of 9 mm (to
comply with clearance and creepage
distances).
Note:
Fan-and-filter unit 3237.xxx is connected by
way of two single wires which are led out of
the unit.
2.
1.
Release the bayonet connection
EN
3238.xxx
3239.xxx
7
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