Welch Vacuum 2511 User Manual

Welch® Owners Manual

FOR PRESSURE/VACUUM PUMP MODEL 2511

Contents: Safety Information Installation Operation Maintenance Speciﬁ cations Warranty

Read and understand the following information and instructions included with your Welch Pressure/Vacuum Pumps before using. This information is for your safety and to prevent damage to the pump.

I. SAFETY INFORMATION I-1. CAUTION: TO PREVENT INJURY…

I-1a. Never operate this product if it has a damaged cord or plug. If it is not working properly, has been dropped,

damaged or has fallen into water, please return the product to a service center for examination and repair. I-1b. Keep the cord away from heated surfaces. I-1c. Never block any air openings. The air openings are for ventilation of the motor inside the plastic housing.

Keep all air openings free of lint, dirt and other foreign objects. I-1d. Never drop any object into any openings. I-1e. This pump has a single use (fuse) type of overload protector. If the motor should overheat, the protector will

shut the unit off. If this should occur, unplug the pump and contact the service center. I-1f. Do not use any tools or attachments without ﬁ rst determining maximum air pressure for that tool or

attachment. I-1g. Be sure to properly identify vacuum and pressure ports before using pump. See labels on pump next to

hose ﬁ ttings. I-2. WARNING: TO REDUCE RISK OF ELECTROCUTION…

I-2a. Do not use this product in or near an area where it can fall or be pulled into water or other liquids. I-2b. Do not reach for this product if it has fallen into liquid. Unplug immediately. I-2c. Use indoors only.

I-3. DANGER: TO REDUCE RISK OF EXPLOSION OR FIRE… I-3a. Do not use this pump in or near explosive atmospheres or where aerosol (spray) products are being used. 1-3b. Do not use this station for organic, basic or acidic vapors. I-3c. Do not use this station in or near an area where ﬂ ammable or explosive liquids or vapors may exist. I-3d. Do not use this product near ﬂ ames.

I-4. SERVICING OF A DOUBLE-INSULATED PRODUCT I-4a. In a double-insulated product, two systems of insulation are provided instead of grounding. No grounding

means is provided on a double-insulated product, nor should a means for grounding be added to the

product. Servicing of a double-insulated product requires extreme care and knowledge of the system and

should be done only by qualiﬁ ed service personnel. Replacement parts for a double-insulated product must

be identical to those parts in the product.

CLASSIFICATION AND SYMBOL GLOSSARY

Double Insulated On (power) Off (power)

1Printed in U.S.A. Part No. 642317 Rev. D 06/09

II. INSTALLATION II-1. INTRODUCTION

This manual has been compiled not only for the care and maintenance of the Welch Dry Pressure/Vacuum

pump now in your possession, but as a helpful reference and guide to prevent many problems which can

occur if used improperly. II-2. UNPACKING

Carefully remove the Pressure/Vacuum pump from the shipping carton. Preserve all paperwork for future

reference. If damage has occurred from shipment, a claim must be ﬁ led with the carrier immediately;

preserve the shipping carton for inspection by the carrier. If you are required to communicate with your

dealer or Welch Vacuum be to include your order numbers for quick identiﬁ cation. Do not return the pump

to the factory without ﬁ rst calling for a returned goods number. II-3. PUMP MOUNTING

Rubber bumper feet are attached to the pump. Rubber bumper feet are excellent for applications involving

a semi-ﬂ exible surface such as a bench top; they help to isolate noise and eliminate creeping. The

Pressure/Vacuum pump should be mounted in a horizontal plane. II-4. PUMP LOCATION

The pressure/vacuum pump should be located preferably in a clean, dry and well-ventilated area. Please

be sure not to block the ventilation ports located on the plastic housing. The pump should be placed where

the surrounding temperature remains between 10°C and 40°C (50°F and 104°F). Always check to insure

the location chosen is protected from direct or indirect moisture contact. II-5. PRESSURE AND VACUUM CONNECTIONS

On the side of the plastic house are located two hose barb ﬁ ttings. The top hose barb ﬁ tting supplies

pressure. The bottom hose barb ﬁ tting supplies vacuum. Be sure to call Welch technical service prior to

start-up at (847) 676-8800 if you have any questions. II-6. ELECTRICAL POWER II-6a. POWER SOURCE REVIEW

Review the power source 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. II-6b. POLARIZED PLUG

This product has a polarized plug (one blade is wider than the other on 115VAC model). This plug will ﬁ t in

a polarized outlet only one way. If the plug does not ﬁ t fully in the outlet, reverse the plug. If it still does not

ﬁ t, contact a qualiﬁ ed electrician to install the proper outlet. Do not change the plug in any way. II-6c. CORD

When unit is not in use, wrap cord securely and store unit in a dry place. Do no abuse cord or plug. II-6d OVERLOAD PROTECTION.

This pump has a single use (fuse) type of overload protector. If the motor should overheat, the protector will

shut the unit off. If this should occur, unplug the pump and contact the service center. II-7. VACUUM CONNECTIONS

All pressure/vacuum pumps come with intake and discharge hose barbs which accept ¼” ID rubber

pressure/vacuum hose. Hose clamps should be used to hold the hose in place. For best results, we

recommend the length of the tubing between the pump and the chamber be kept as short as possible. II-8. VACUUM AND PRESSURE GAUGES

A common vacuum gauge used for measuring in mmHg or inHg is the dial vacuum gauge. The dial vacuum

gauge gives negative pressure – that is pressure below atmospheric. The reference point for the vacuum

gauge is atmospheric pressure. Please keep in mind that atmospheric pressure tends to vary from day to

day. As a result of this variability the dial vacuum gauge will indicate different maximum vacuum readings

from day to day. A common pressure gauge is the dial pressure gauge gives pressure above atmospheric. The reference

point for the pressure gauge is atmospheric pressure.

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