Maico DZR B Series, Mounting And Operating Instructions, Page: 19 / 38

10. Electrical connection
│ UK
17
● Reverse in air flow direction for DZR units
with reverse wiring of external conductor
L1 and L2.
● Operation with
frequency converters is
only admitted if factory is consulted.
Feasibility must be checked in each case.
10.1 Fan connection
Prescribed tightening torques
Component
Tightening
torque
Terminal box cover M4
stainless steel cylinder head
screws
1.0 Nm
Mantle terminal M7 x 0.75 mm
0.7 Nm
Motor terminals TK
0.7 Nm
1. Switch off mains fuse and prevent from
being started up again. Attach warning sign.
2. Remove the terminal box cover.
3. Pierce cable grommet in terminal box [7]
with a nozzle pin. Note cable diameter.
4. Guide the power cable into the terminal
box such that the cable grommet fits
around the cable sheathing completely.
Have customer seal cable grommet if
required.
5. Wire fan to the terminal block according to
the wiring diagram (

Chapter 17). Note
tightening torques.
6. Connect external control device to the two
motor terminals TK of the terminal block.
Note tightening torques.
7. Install thermal motor protection for pole-
changeable units or DZR 25/4 D.
8. Fit optional on/off switch.
9. Connect optional accessory components
(speed controller, 5-step transformer)

Chapter 10.2 or 10.3.
10. Fit terminal box cover. Ensure that there
are no dirt particles in the terminal box and
that the seal of the terminal box cover has
close contact all the way around the
terminal box. Note tightening torques.
Check seal integrity of terminal box.
10.2 Connecting speed controller to
EZR …
For stepless control of EZR units. For speed
controller suitable for unit type

Internet or
catalogue.
The technology in the phase angle
controller may cause a humming
noise.
NOTICE
The fan will stop / suffer functional
problems if the output voltage on the
speed controller is too low.

Observe information in the speed
controller operating instructions.

Always set the minimum speed on the
speed controller such that the fan motor
starts up again after power failure.
10.3 Connecting 5-step transformer to
EZR …/DZR …
For stepped speed adjustment of EZR/DZR
units. For 5-
step transformer TR… or TRV
suitable for unit type

Internet or catalogue.
11. Commissioning, function test
1. Switch off mains fuse, secure against
being accidentally switched back on and
position a warning sign.
2. Check that all screw connections are tight.
3. Ensure that the air can flow unhindered
and that there are no foreign bodies in the
air channel.
4. Check that connection data matches
technical data on the unit (

rating plate).
5. Remove protection against switching back
on and switch on mains fuse.
6. Run function test. Check the direction of
rotation / air flow direction and that the
impeller runs quietly and ensure if
necessary.
7. Switch off unit.