Economizer WA, WL & WH Series, Features

ECONOMIZER – WA, WL & WH SERIES

FEATURES

•One piece construction – easy to install with no mechanical linkage adjustment required.

•Exhaust air damper – built in with positive closed position. Provides exhaust air capability to prevent

pressurization of tight buildings.

•Actuator motor – 24 volt, power open, spring return with built in torque limiting switch.

•Proportioning type control – for maximum “Free Cooling” economy and comfort with up to 100% outside air.

•Enthalpy control to monitor outdoor temperature and humidity – adjustable.

•Minimum position potentiometer – adjustable to control minimum damper blade position.

•Mixed air sensor to monitor outdoor and return air to automatically modulate damper position.

FIGURE 6

ECONOMIZER OPERATION

ECONOMIZER SEQUENCE OF OPERATION

CONDITION A – COOL OUTDOORS

First stage cooling closes and powers the economizer dampers to economizer mode and the indoor blower starts. Mixed Air Sensor senses a mixture of return air and outdoor air and modulates the dampers accordingly. Compressor operation is inhibited. (See Figure 6.)

If second stage closes on the thermostat, the dampers return to the closed or minimum position setting and the compressor starts for mechanical cooling.

MIS-347

Manual 2100-390 Page 8

EIFM-3B, EIFM-2B specifications

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