Ventilation Controller

摘要

A ventilation system for a building in some cases includes a main HVAC blower for moving temperature-conditioned air through the building plus a smaller ventilation blower for providing fresh air. A controller regulates the ventilation blower's speed to provide a target ventilation flow rate regardless of changes in the pressure differential between the indoor and outdoor air. To ensure that the target rate is appropriate for a particular building, the target flow rate is determined based on a ventilation setting that reflects a specified number of bedrooms and a specified amount of floor space of the building.

主权项

1. An HVAC system for a building that defines an outdoor area and an indoor area, the building includes a specified number of rooms and a specified amount of floor space, the HVAC system comprising:
a main blower configured to deliver temperature-conditioned air into the indoor area through a first supply path that extends from the main blower to the indoor area; a ventilation blower configured to deliver air from the indoor area and into the outdoor area through a second supply path that extends from the ventilation blower to the outdoor area; wherein the second supply path is independent from a first return path that extends from the indoor area to the main blower; a controller operatively coupled to the ventilation blower to render the ventilation blower selectively operable in a normal mode and an alternate mode, such that the controller determines the actual ventilation flow rate through the ventilation blower as a function of the rotational speed of the ventilation blower and the power consumption of the motor of the ventilation blower; and a control system having an electrical output and a manual input, wherein the electrical output is operatively coupled to the ventilation blower for urging the ventilation blower to move the ventilation air at a target ventilation flow rate, wherein the target ventilation flow rate is based on a setup signal that is communicated to the controller via the manual input, wherein the setup signal is based on the specified number of rooms and the specified amount of floor space.