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Modern Parallels to July 1929, with Rob McManamy
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HART communicator
Vari-Green controls, when used in conjunction with Greenheck’s Vari-Green motor, are designed to maximize the energy efficiency of ventilation systems in a variety of applications. For indoor-air-quality applications, a temperature/humidity or volatile-organic-compound control automatically adjusts ventilation rates to or from an area by increasing or decreasing fan speed. In demand-control-ventilation applications, a constant-pressure control monitors static pressure and maintains a constant airflow level within a duct. —GreenheckSolar chiller system
Classroom heat pump
The third-generation Airedale ClassMate vertical DX cooling and heat-pump system is available in four capacities from 2 to 5 cooling tons in two cabinet sizes. It features a 15-percent EER increase over the existing ClassMate HE. Standard features of the new Class Mate units include Modine’s patented CF all-aluminum microchannel evaporator coil, modulating electronically commutated motors on all fans, and energy-recovery or economizer modules. All heat exchangers—indoor coil, hot-gas reheat coil, and hot-water coil or electric heat elements—can be factory-installed, eliminating the need for a plenum for additional heat. Optional hot-water-heating-coil and valve/piping packages allow for hydronic heating with top or bottom connections. —Modine
Series CDTR carbon-dioxide, relative-humidity, and temperature transmitters reduce the number of sensors mounted on a wall or in a duct. With three sensors combined in one device, system integrators are able to reduce material costs and sensor-installation time. The pluggable humidity sensor allows it or the temperature sensor to be replaced at a fraction of the cost of a new carbon-dioxide transmitter.—Dwyer Instruments