Maico DZR 25/4 D, Mounting & Operating Instructions, Page: 8 / 16

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4. Fasten folded spiral seams ducts to the fan
with flexible cuffs or couplings (types EL and
ELA).
5. Fit a protective grille in the case of a free
air inlet.
Electrical connection
•
The electrical connection work should only be
carried out by a professional electrician, according
to the wiring diagram (see pages 13 … 16).
•
Before working with terminal boxes, always
switch off the main fuse at the fuse box and post
warning signs advising not to re-apply power. This
is particularly valid where the switch is some way
away from the fan.
•
The connecting cable between the power source
and the terminal box must be a permanently laid
cable. The cables must be fed into the terminal
box so that the cable grommet fits tightly round
the non-metallic sheathed cable. If the power
cable is not installed correctly, the protection class
indicated on the rating plate cannot be
guaranteed and no claims can be made under the
terms of the warranty .
•
The fan motor is thermally protected, see
Chapter “Thermal overload protection”. The
control unit should not be able to switch itself
back on after being triggered.
•
Pole-changing motors with speed ratios of
12/6, 8/4 or 4/2 have a Dahlander pole chang-
ing circuit.
•
Pole-changing motors with speed ratios of 8/6
or 6/4 are equipped with separate windings.
•
Protective temperature limiter:
Technical Data
Nominal voltage at 50 Hz/60Hz 250 VAC
Nominal current (ohmic) cos
ϕ
=1.0 max. 2.5 A
Nominal current (inductive) cos
ϕ
=0.6 max. 1.6 A
Procedure
1. Wire up the fan according to the wiring diagram
(see pages 13 … 16).
2. Connect an external control unit with automatic
switch-off. Connect the control unit to both “TK”
motor contacts in the case of models with installed
thermal contact.
Starting up, Function test
•
Before starting up:
– check that all screwed connections are tight.
– Check the air channel for dirt. If necessary, clean
the air channel.
– Check compliance with the Technical data.
•
After starting up, make sure the impeller is running
quietly and if necessary adjust accordingly. It is
also important to ensure that there is a free flow
of air.
Problems, Solutions
•
Main fuse: Always check whether the mains fuse
is switched on in the case of a fault.
•
The thermal overload protection has been
triggered, the fan switches off.
Leave the device switched off long enough for the
motor and temperature limiter to cool down.
Depending on the size and the temperatures
involved, the cool-down time could be up to
30 minutes. Only switch it back on agin then.
If the fault is still present or if it occurs again,
remove the power completely (switch off the main
fuse and post warning signs advising not to re-
apply power). Call on the services of a trained
electrician to identify and eliminate the cause of
the problem.
Maintenance
The device is maintenance-free.
Technical Data
See the rating plate or the valid catalogue.
Disposal
The fan contains some recyclable materials and
some substances that should not be disposed of in
the rubbish. After its lifetime has elapsed, dispose
of the device according to the valid regulations.