NA
Y
AC
6.2 Connection to System
!
Warning
6
The pump is strictly forbidden to operate in areas with risk of fire and explosion.
!
Warning
Make sure the gas flow at the exhaust port is not blocked or restricted in any way. Check to ensure the exhaust line is not
obstructed by deposits before start-up.
!
Warning
The exhaust pressure shall not be 1.15 bar higher than the absolute pressure (relative pressure 0.15 bar) but not be lower
than atmospheric pressure.
'
•
Notice
Take the following into account to choose the pump installation site: convenient for installation, maintenance, disassembly
and electrical connections as well as good ventilation.
'
•
Notice
Place the pump feet horizontally or fix the feet with bolts while connecting the pump to vacuum system.
'
•
Notice
Oblique installation may result in pump's vibration, high noise or even damage. The pump shall be set up on a flat and firm surface.
'
•
Notice
The length of connecting line between pump and vacuum system shall be as short as possible. The diameter of the connecting
line shall be the same as that of intake port.
'
•
Notice
The hoop at intake port is available for connection with vacuum hose or regular vacuum pipe. No any stress generated by the
pipe on the hoop is allowed while connecting.
!
Notice
The exhaust line should be laid so that it slopes down so as to prevent condensate from backstreaming into the pump and
contaminating the oil. Drain the oil in the exhaust line periodically to avoid block of exhaust line. If the exhaust line slopes up,
the installation of a condensate trap is necessary. Check leak of the connection between pipe and flange. Vacuum tightness is
essential for the achievement of ultimate pressure of the pump.
6.3 Symbols for Switch that Controls the Motor
START or ON
STOP or OFF
I
0
Fig. 5 On and off symbols
'
Notice
•
NRD-16/24/30 employs an automatically reset thermal limiter which can shut off the entire product. In the event that the
thermal limiter operates, nothing is need to do but waiting for the motor to restart automatically if it has been cooled to the
temperature which is specified by the thermal limiter type. Of course.users can also choose to cut off the power supply and
re-energize it until the motor has been cooled to the ambient temperature.
6.4 Grounding instructions
t Warning
•
This product must be grounded. In the event of an electrical short circuit, grounding reduces the risk of electric shock by
providing an escape wire for the electric current. This product is equipped with a cord having a grounding wire with an
appropriate grounding plug. The plug must be plugged into an outlet that is properly installed and grounded in accordance
with all local codes and ordinances.
t Warning
•
Improper installation of the grounding plug is able to result in a risk of electric shock. When repair or replacement of the cord
or plug is required, do not connect the grounding wire to either flat blade terminal. The wire with insulation having an outer
surface that is green with or without yellow stripes is the grounding wire.
, Warning
•
Check with a qualified electrician or serviceman when the grounding instructions are not completely understood, or when in
doubt as to whether the product is properly grounded. Do not modify the plug provided; if it does not fit the outlet, have the
proper outlet installed by a qualified electrician.
t Warning
•
This product is factory-equipped with a specific electric cord and plug for connection to a proper electric circuit. Only connect
the product to an outlet having the same configuration as the plug. Do not use an adapter with this product. When the
product must be reconnected for use on a different type of electric circuit, the reconnection shall be made by qualified service
personnel.
7. Initial Start and Operation
7.1 Start-up
!
Warning
Make sure the gas flow at the exhaust port is not blocked or restricted in any way. Do not start the pump if the exhaust port
is blocked.
7
