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6

 

 

 

 

2.6

 

Electrical Power

 

 

2.6a  Power Source Review

 

 

Review the power source and the motor rating to be sure they agree in voltage, phase and frequency.  Serious 
damage may occur to the motor if it is connected to an improper voltage.  All Welch pumps must be grounded. 
Grounding reduces the risk of electric shock in the event of an electrical short circuit. Consult your local electrical 
codes if you have doubts.

 

 

2.6b  Overload Protection.

 

 

Motor thermal overload protection is made available by the motor manufacturer as an aid to minimizing motor 
failure.  Overload protection is a standard feature on both 50 and 60 Hz single-phase motors.  The motors have 
automatic overload protection.  Automatic reset protection is designed to rest itself after a predetermined cooling 
period.  If the fault to the drive remains unaltered, the motor will cycle on and off until the fault is corrected.

 

 

2.7

 

Vacuum Connections

 

 

The 2090/2085  vacuum pumps come with NW25 ISO vacuum flange with a 3/8"-18 NPT threaded I.D. Hinge 
clamps and centering assemblies should be implemented if using the flange connections. If using the 3/8”-18 NPT 
threaded connection, a suitable quality liquid/paste thread sealant should be used. Since both models operate in 
the viscous flow regime, the small diameter of the hose will generate minimal conductance loss.  For best results, 
Welch  recommends the length of the tubing between the pump and the process be kept as short as possible.  The 
exhaust plumbing will act to muffle pump noise.  The exhaust vent line will allow gases and vapors  pumped 
through the pump to be piped from the work area into a hood. Be sure to safely exhaust the process vapors with 
consideration to worker health and fire safety.

 

 
 

2.8

 

Traps

 

 

2.8a  The need for a Trap

 

 

The use of Teflon coated aluminum heads, Teflon liner over diaphragms and stainless valves allows the pumps to 
handle mildly corrosive solvents, acids and bases.  If there is a chance liquid may be drawn from the process 
under evacuation, Welch recommends a liquid trap be placed  between the process and the pump. 
 

When a heavy  load of vapor is evolved from the vacuum process, a cold trap is recommended to help prevent 
damage to the pump mechanism.   

 

The symptom of a high vapor load is if you have droplets of liquid coming out of the exhaust port.  If you see 
droplets of water, Welch recommends you use a cold trap to capture the water before entering the pump or dilute 
the water vapor stream by adding dry nitrogen to the gas flow.  Please call our customer service department for 
additional information at (847) 676-8800.

 

Summary of Contents for Welch 2085W-01

Page 1: ...OWNER S MANUAL FOR DRY VACUUM PUMPS MODELS 2090W 01 and 2085W 01 Part No 642978 Printed in the U S A WARNING Be sure to properly identify intake and discharge before using pump See Section 2 5...

Page 2: ...E OF CONTENTS SECTION PAGE 1 Safety Information 3 2 Installation 5 3 Operation 8 4 Maintenance 8 5 Troubleshooting 9 6 Specifications 10 7 DimensionalDrawing 11 8 ExplodedViews and Kits 12 13 9 Warran...

Page 3: ...openings 1 1e This pump is thermally protected and can automatically restart when the protector resets Always disconnect power source before servicing 1 1f Wear safety glasses or goggles when operatin...

Page 4: ...4 1 3c Never operate this product outdoors in the rain or in a wet area WARNING Failure to observe the above safety precautions could result in severe bodily injury including death in extreme cases...

Page 5: ...ch as bench tops they help to isolate noise and eliminate creeping T h e 2 0 9 0 2 0 8 5 vacuum pumps should be mounted in a horizontal plane 2 4 Pump Location The pressure vacuum pump should be locat...

Page 6: ...ould be used Since both models operate in the viscous flow regime the small diameter of the hose will generate minimal conductance loss For best results Welch recommends the length of the tubing betwe...

Page 7: ...densate If the trap becomes saturated it should be disconnected from the system drained and cleaned An increase in pressure in the vacuum system will normally indicate that the trap has become saturat...

Page 8: ...em and painting the suspected area with a water liquid dish soap solution Escaping air will produce soap bubbles 3 3 Operating Pressure Range Models 2090 and 2085 Dry vacuum pumps are designed to be r...

Page 9: ...be accomplished by blocking of the intake and reading the vacuum level on the gauge See Section 2 8 5 2 Troubleshooting Guide Poor Pumping Speed X Poor Vacuum X Loud Unit X Possible Cause Damaged Val...

Page 10: ...V acuum in Hg 29 26 Number of Vacuum Stages 2 1 Motor Horsepower 1 2 1 2 V acuum Restart yes yes Minimum Tubing Needed I D in 7 16 7 16 Weight lbs kg 52 23 6 52 23 6 Catalog Number 2090W 01 2085W 01...

Page 11: ...11 Section 7 DRAWINGS 7 1 Dimensional Drawings...

Page 12: ...ve Flapper Intake 4 15 See Note 1 Screw V alve Plate 10 16 See Note 1 Screw V alve Flapper Exhaust 4 17 See Note 1 Valve Plate Gasket 2 18 See Note 1 Valve Flapper Intake Exhaust 4 22 Connecting Rod 2...

Page 13: ...ve Flapper Intake 4 15 See Note 1 Screw V alve Plate 10 16 See Note 1 Screw V alve Flapper Exhaust 4 17 See Note 1 Valve Plate Gasket 2 18 See Note 1 Valve Flapper Intake Exhaust 4 22 Connecting Rod 2...

Page 14: ...repaired under this warranty rather than replaced The warranty is effective for one year from the date of original purchase when 1 The warranty card has been completed and returned 2 The product is r...

Page 15: ..._______________________ ________________________________________________________________________________ ________________________________________________________________________________ ______________...

Page 16: ...Mount Prospect IL 60056 Phone 847 676 8800 Technical Support Fax 847 677 8606 E Mail gdwelchvacuum gardnerdenver com Web Page www welchvacuum com Copyright 2013 Gardner Denver Welch Vacuum Technology...

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