Nederman VAC 20, Instruction Manual

Page: 23 / 328

VAC 20
23
EN
6.1.4 Compressed air installation
Requirements
For air consumption, quality and maximum and minimum pressure, see ‘Table 3-1:
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 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 Using VAC 20
7.1 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
‘6.1.1 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.
• All electrical connections have been correctly made as in Figures 6-7.
• Nederman start and control units have the terminals connected, and in some cases
jumped connections. Verify against the connecting diagrams.
• The pilot signal cable from all valves is linked to the start and control unit on units
with automatic start/stop.
• Anti surge control: The current transformer is connected to the relay box.