Nederman 40103102 User Manual Download Page 20

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VAC 20

4.7 Optional: Compressed air switch

An optional compressed air switch can be mounted in
the vacuum unit to prevent it from starting with no
compressed air supply. No air supply must result in an
error indication in the start and control unit.

For electrical connections, see

Figure 6

Figure 7

and also the Start and Control Unit manual. The com-
pressed air switch is wired in series with the thermal
fuse. Use a jumper to connect the terminals if no com-
pressed air switch is used.

5 Before installation

5.1 Delivery check

Check the VAC 20 unit for any transport damages. In
case of damage or parts missing, notify the carrier and
your local Nederman representative immediately. It is
recommended to transport the VAC 20 unit to the in-
stallation site while still in the factory packing.

5.2 Installation requirements

5.2.1 Location

Prepare the location where VAC 20 is to be placed be-
fore installation. An open working space around the
unit is necessary for maintenance. A gap of at least
0.7 meters in front of the unit is required to allow for
the opening of the unit.

5.2.2 Foundation

The unit must be anchored to a hard, level and firm
foundation, such as a concrete foundation.

Consider the total weight of the unit with accessories,
see

Section 3.3 Technical data

, when calculating the

foundation or supporting structure.

6 Installation

WARNING! Risk of personal injury
• Ensure the dust collector is attached to the

unit’s inlet and the silencer attached to the
outlet. Suction at the inlet is very powerful
and any contact with the fan wheel could res-
ult in severe injury.

• Use ear protection and safety goggles during

the installation of the unit!

• Lock the main compressed air valve in the

closed position during maintenance.

The unit can be placed indoors or outdoors.

Consider the following when installing VAC 20:
• The foundation is to be level and hard, see

Sec-

tion 5.2.2 Foundation

• Install VAC 20 away from heat sources or hot sur-

faces.

• Ensure that handling is convenient.

• Ensure that service and maintenance are conveni-

ent.

• Beware of hot air from the outlet.
• Ambient temperature must be within operating

temperature defined in

Section 3.3 Technical data

• Make sure the exhaust duct is protected from the

rain.

• Make sure the exhaust duct has a grid so no objects

can get into the duct.

6.1 Indoor installation

Also, consider the following when installing VAC 20
indoors:
• There are to be at least two ventilation openings

for ventilation, at least 250×250 mm (10"×10") in
size. One is to be placed up high and the other on the
down-low.

• Never seal a small room with a VAC 20unit installed

completely. At some stages, the unit will admit air
directly into the roots pump. This can cause a dan-
gerous underpressure in the room if the airflow is
obstructed.

Noise levels for the VAC series vary according to size,
site and running conditions. See

Section 3.3 Technic-

al data

for measured noise levels. The noise level will

rise by several dB(A) when the airflow starts getting
close to the flow restrictor setting. Measurements
have been made free-field with the unit standing on a
reflective base in accordance to ISO 11201 standard.
The noise levels can be several dB(A) higher in a room
with hard reflective walls. The noise level can be re-
duced by an optional silencer, see

Figure 2

Item 1 and

Section 4.1 Overview

6.2 Outdoor installation

Also, consider the following if the unit is installed out-
doors:
• Cover the top of the unit to protect it from snow,

rain or falling debris.

• Avoid placing the unit against a wall directly ex-

posed to the sun.

6.3 Electrical installation

Connect the motor to the start and control unit and/or
optional Maintenance switch.

For electrical connections, see the start and control
unit’s manual and also

tions may vary depending on the options chosen. Con-
necting material such as cables is not included with
the unit.

Most failures are results from faults in the electric-
al equipment or connections. The motor overload re-
lay must be of the ‘heavy start type’ as some units are
heavy to start. Otherwise, the motor overload may trip
because of the high current and the long time spent in
the Y-mode.