Schneider Electric's HVAC eNewsletter

January 2009

Improve your HVAC system and save money with PID control
Uncontrollable changes both inside and outside of a building can impact efforts to maintain a desired temperature. Changes in occupancy, lighting, computer-equipment and outdoor temperature cause the set temperature in a building to fluctuate constantly. Incorporating PID control with variable-speed drives results in HVAC systems that are more efficient and save money.

Proportional control provides the output capacity of HVAC equipment matching the load requirements of a building. Savings can be realized in three major areas:

Maintenance
Reducing dependence on throttling valves and dampers for the mechanical adjustment of airflow output saves on the maintenance of temperature-control equipment.

Energy
Open-loop control equipment cycles on and off constantly, causing a peak in-rush current during startup. Closed-loop controls used in PID save energy by providing continuous operation of AC motors at lower speeds.

Money
Reducing pump and fan-motor speed reduces electricity costs.

For more information on PID control, read the complete article written by Schneider Electric and published in HPAC Engineering, email us at HVAC@us.Schneider-Electric.com or visit our HVAC website at www.us.Schneider-Electric.com/HVAC.

Product Focus: The Magelis XBT GT HMI
Is rugged dependability with high visibility essential for the touch screens you build into your systems? Then choose Magelis… the ultimate in HMI from Schneider Electric.

Compact, simple and robust, The Magelis XBT GT’s high-visibility screen with adjustable contrast and brightness - combined with an easy access analog touch pad - make for user-friendly operation, even under extreme conditions. And, its multi-link capability on all communication ports, including serial lines and Ethernet, make it and your system fully Transparent Ready ® - giving your customer the ability to monitor their systems remotely, from any PC, anywhere!

Learn more about Magelis XBT GT HMI
www.us.schneider-electric.com/hmi

Visit Schneider Electric’s HVAC website at www.us.Schneider-Electric.com/HVAC, contact your local sales representative or call your local Square D distributor.