Page 187 - HVAC Pump Handbook
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Rishel_07.qxd 20/4/06 6:29 PM Page 184
Pump Drivers and Variable-Speed Drives
184 HVAC Pumps and Their Performance
Figure 7.2 WWE of pump-motor combinations.
namely, drip-proof; totally enclosed, fan cooled; and explosion-proof.
Particular atmospheres that are dusty or contain specific chemicals may
require special motor enclosures.
Drip-proof motors are designed for cooling by ambient air and are
called open-frame on horizontal motors and weather-protected (WP1)
on vertical motors. Open-frame drip-proof motors are designed for
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