Nederman VAC 12/20 Manual De Instrucciones página 25

• Avoid placing the unit against a wall directly exposed to the sun.
7.1.3 Compressed air installation
Requirements
For air consumption, quality and maximum and minimum pressure, see
'Table 4-1: Technical data'.
NOTE!
The specified air consumption of the unit is limited to the short
operation of the start-up valve.
As new pipes may contain dirt, particles or debris, the compressed air pipe are
to be blown clean before connecting the VAC 12/20.
The enclosed compressed air filter must be installed to ensure the reliable
and safe operation of the unit. A main compressed air valve, that vents the
remaining pressure of the unit, should be installed, see Figure 5 Item 16.
NOTE!
Take necessary measures to avoid water or humidity in the
compressed air when the unit is installed in cold environments.
NOTE!
If antifreeze additives are used, use them continuously. Once added,
the removal of antifreeze additive can cause the pneumatic components to
malfunction.
Installation
Connect a compressed air supply to the inlet, see Figure 5.
7.2 Optional: Installing Anti surge control
The valve motor is factory-wired to the relay box. Connections between
the start and control unit and relay box are to be made on site following the
diagram in Figure 8.
NOTE!
The current transformer is to be connected to the relay box prior to
starting the vacuum unit. Otherwise, the transformer may be ruined.
8 Using VAC 12/20
8.1 Before start-up
The vacuum unit and any auxiliary options are tested before delivery and all
functions are checked. A test report accompanies each unit.
Ensure the following before the initial start-up:
• The maintenance switch is installed (if used).
• The installation room has ventilation openings (if used indoors). See
'7.1.1 Indoor installation'.
• Dust collector, duct and valves at the work sites are connected.
• Exhaust air is ducted away from the installation (if used indoors).
• Make sure the exhaust duct is protected from rain and snow.
• Make sure the exhaust duct is fitted with a grid so no foreign objects can
get into the duct.
• Compressed air supply is permanently fitted.
VAC 12/20 EN
25