Systems and methods for fault detection using smart valves

A fault detection system for detecting a flow restriction in an air handler unit, the fault detection system comprising:

• a coil located in an air duct of the air handler unit, the coil configured to operate as a conduit for process fluid in the air duct;
• an air temperature sensor located in an air duct of the air handler unit to determine an air temperature downstream of the coil;
• and
• a smart valve having a controller in communication with the air temperature sensor, the controller operable to use the air temperature downstream of the coil and a valve actuator position to determine whether the coil is operating at a reduced capacity, and to modulate the valve actuator position to minimize an energy loss of the air handler unit until rectification of the reduced capacity.

A fault detection system for detecting a flow restriction in an air handler unit, the fault detection system comprising:

• a coil located in an air duct of the air handler unit, the coil configured to operate as a conduit for process fluid in the air duct;
• an air temperature sensor located in an air duct of the air handler unit to determine an air temperature downstream of the coil;
• a smart valve having a controller in communication with the air temperature sensor, the controller operable to use the air temperature downstream of the coil and a valve actuator position to determine whether the coil is operating at a reduced capacity;
• and
• a notification device in communication with the controller of the smart valve, whereby upon determining the reduced capacity, the controller of the smart valve sends a message to the notification device.