UNIT WITH RECOVERY WHEEL AND ECONOMIZER AND METHOD OF CONTROL

摘要

Ventilating units that include a recovery wheel, a supply air outlet from the wheel, an outdoor air supply fan that moves outdoor air through the recovery wheel, an economizer damper that opens to bring outdoor air directly into the supply air outlet, and an exhaust air discharge fan that moves exhaust air through the recovery wheel and to outdoors; HVAC units that include air conditioning with an air handler supply fan, a recovery wheel, an economizer section, an outdoor air supply fan, and controls; and methods of controlling airflow in an HVAC unit that include controlling an economizer damper based on outdoor and return air temperature and enthalpy or dew point. Some ventilating units connect to a packaged air handler and other ventilating units include the air handler, cooling coil, and air handler supply fan. Some embodiments include another damper that opens to bypass the recovery wheel for power exhaust.

主权项

1. A unit for ventilating a space within a building, the unit comprising:
a recovery wheel; a supply air outlet from the recovery wheel; an outdoor air supply fan that draws a first stream of outdoor air into the unit and moves the first stream of the outdoor air through the recovery wheel to the supply air outlet; an economizer damper that opens to bring a second stream of the outdoor air into the supply air outlet; and an exhaust air discharge fan that moves exhaust air from the space through the recovery wheel and blows the exhaust air out of the unit to outdoors.