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An HVAC component that uses outside air, under suitable climate conditions, to reduce required mechanical cooling. When the outside air’s enthalpy is less than the required supply air during a call for cooling, an economizer allows a building’s mechanical ventilation system to use up to the maximum amount of outside air. enthalpy
If the supply current is redirected downstream into the third (ground) circuit conductor (e.g., if the grounded metallic case of a power tool contacts a 120-volt conductor), or into earth ground (e.g., if a person contacts a 120-volt conductor), the neutral return current will be less than the supply current, resulting in a positive net current ...
Coupons are associated with Sunday circulars and help consumers who struggle to make ends meet. [19] A coupon is a discount, either of a certain specified amount or a percentage to the holder of a voucher, usually with certain terms. Commonly, there are restrictions as for other discounts, such as being valid only if a certain quantity is ...
HD Supply Holdings, Inc. (formerly Maintenance Warehouse) is an industrial distributor in North America. The company provides a broad range of products and value-added services to approximately 250,000 professional customers in maintenance, repair and operations, infrastructure and power and specialty construction sectors. [ 4 ]
Watsco, Inc. is a distributor of air conditioning, heating and refrigeration equipment, and related parts and supplies (HVAC/R) in the United States. [2] Watsco was founded more than 60 years ago as a manufacturer of parts, components, and tools used in the HVAC/R industry.
These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.
Sometimes AHUs discharge (supply) and admit (return) air directly to and from the space served without ductwork [4] Small air handlers, for local use, are called terminal units , and may only include an air filter, coil, and blower; these simple terminal units are called blower coils or fan coil units .
RTS/CTS (request to send/ clear to send) may refer to: Request to send and clear to send, flow control signals RS-232 RTS/CTS, today's [as of?] usual RS-232 hardware ...