Patent ID: 11927358
Assignee: JOHNSON CONTROLS TYCO IP HOLDINGS LLP
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 11:
12. The control system of claim 11, wherein the control circuitry is configured to:
cause modulation of the variable-speed exhaust fan and deactivate the constant-speed exhaust fan based on a determination that the air pressure deviates from the air pressure setpoint by a first amount; and
cause modulation of the variable-speed exhaust fan and actuation of the constant-speed exhaust fan based on a determination that the air pressure deviates from the air pressure setpoint by a second amount greater than the first amount,
wherein the variable-speed exhaust fan and the constant-speed exhaust fan are each configured to discharge half of a total air flow rating of the HVAC system.