Welch Vacuum 2511 WOB-L - Manual (Page 2)

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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