2.60 Electrical Power
2.61
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.
The plug must be plugged into a properly grounded outlet. Consult your local electrical codes if you
have doubts.
2.62
Overload Protection (Model 2515)
Motor thermal overload protection is made available by the motor manufacturer as an aid to minimize
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 reset 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.
2.63
Classification And Symbol Glossary
2.70 Vacuum Connection
2.71
For best results, Welch recommends the length of the tubing between the pump and the chamber be
kept as small as possible.
2.80 Vacuum Gauges
2.81
All Aspiration/Filtration Vacuum Systems come with dial vacuum gauges. The vacuum gauge gives
negative pressure - That is pressure below atmospheric. The reference point for the gauge is
atmospheric pressure.
2.90 Traps
2.91
The need for a Trap
The pumps will handle humid air. All wetted aluminum parts are treated for corrosion protection from
moisture. All other wetted parts are stainless steel. A plastic trap with a float valve is attached to the
regulator assembly to prevent water condensate from accidentally being ingested into the pump.
See figure below.
WARNING
The pump is not recommended for pumping acid, base or organic vapors
or gases. Serious damage to the pump will shorten the pump’s service life.
In addition, pumping flammable vapors or gases can lead to serious safety
hazard leading to fire or explosion.
Filtration Manifold
Model 2515
7
