Edwards nES Series User Manual

▪ When pumping condensible vapours and parculates, more frequent uid changes
are required to maintain pump life. Contact us about types and styles of ltraon
units.
▪ Make sure there is no backpressure in the exhaust line of the vacuum pump.
Vacuum pumps are not specically designed to compress exhaust gas above
atmospheric pressure. Signicant back pressure can overheat the pump and cause
motor overloading. Backpressure on the pump should not exceed 0.15 bar(e)
under normal operang condions.
▪ Maintain system seals regularly. Damaged O-rings and gaskets must be replaced
immediately. All ange faces must be free of dirt, lubricant and scratches.
▪
Do not use collapsible tubing to plumb the vacuum system. Any restricons in line
diameter caused by tube collapse will reduce available pumping capacity.
▪
In mulple pump installaons, check valves should be installed in the inlet piping.
This will prevent uid from being drawn from an 'o' unit into an operang unit.
Check valves should be properly sized so as not to "chaer" during operaon.
Spring‑loaded, elastomer seated check valves are recommended. These should be
mounted in a horizontal ow orientaon. Using properly sized actuated valves is
even a beer soluon. This generally results in a lower pressure drop when open
and a beer sealing when closed.
▪
Vacuum gauge ports and gauges should be installed in each leg of central vacuum
piping. This provides a diagnosc tool for troubleshoong both the applicaon and
any pump‑related problems.
▪ Make sure that no temperature-sensive parts (plasc, wood, cardboard, paper,
and electronics) will touch the surface of the vacuum pumps.
▪
Ambient and inlet temperature may never exceed the limits of the pump's working
range. Make sure that the installaon locaon is vented such that enough cooling
of the vacuum pumps are available.
WARNING: CONTAMINATION TO PARTS
Risk of damage to equipment. Touch the inner secons of the pumps only while
wearing clean gloves. Use clean tools to do the necessary work in a clean and dry
room.
Clean the bearings before re-greasing.
Note:
The grease of the bearings must be changed once a year for an operang me higher
than 5000 hours/year or every 5000 hours for an operang me less than 5000 hours/
year.
4.3 Electrical connecons
▪
Always use a protecon system, including an over-current protecon and an
electrical disconnecng device, between the pump and the electric power supply.
Motor currents can be found on the motor data plate. The pump is normally
delivered without an electrical cable or switch. For the electrical connecon, check
the diagram inside the terminal box or on the motor data plate.
▪
For pumps with a three-phase motor, check the diagram inside the terminal box or
on the motor data plate.
Page 30 - 07/2020
A35104880_B - Installaon

Edwards nES Series Specifications

General

Brand	Edwards
Model	nES Series
Category	Water Pump
Language	English