York Smart Equipment Control

This alarm occurs when the economizer module recognizes a building pressure input, but then loses that recognition. It can also happen if the pressure readings go outside the sensor's operating range.

This alarm occurs when 24 VAC power is lost from the HPS1 terminal, indicating a high-pressure condition in refrigeration circuit 1. Multiple occurrences within an hour will cause a hard lockout.

This alarm occurs when 24 VAC power is lost from the HPS2 terminal, indicating a high-pressure condition in refrigeration circuit 2. Multiple occurrences within an hour will cause a hard lockout.

This alarm occurs when 24 VAC power is lost from the HPS3 terminal, indicating a high-pressure condition in refrigeration circuit 3. Multiple occurrences within an hour will cause a hard lockout.

This alarm is activated when the dirty filter switch (DFS) closes, sending a 24 VAC signal to the SEC board. It indicates that the air filters need to be changed.

This alarm means the economizer damper is open beyond its minimum position when it should not be, typically occurring when the unit is in occupied mode but not in a free cooling situation.

This alarm means the economizer damper is not operating within its set parameters, and the outside air damper is open less than its minimum setting while the unit is in occupied mode.

This alarm signifies that the Evaporator Coil 1 (EC1) sensor has failed, either due to an open circuit or by providing readings outside its expected range. This sensor protects the compressor from freezing.

This alarm indicates a failure with the Evaporator Coil Temperature 2 (EC2) sensor. This sensor is crucial for protecting the compressor from freezing conditions.

This alarm indicates a failure with the Evaporator Coil Temperature 3 (EC3) sensor, likely due to an open circuit or exceeding its input range. This sensor protects the compressor.

This alarm indicates a failure with the Evaporator Coil Temperature 4 (EC4) sensor, likely due to an open circuit or exceeding its input range. This sensor protects the compressor.

This alarm triggers when the supply air temperature exceeds the set heating or cooling limit. This can occur if the Supply Air Heating Limit or Supply Air Cooling Limit is enabled.

This alarm indicates that the heating stage 2 (HS2) is disabled because of an issue related to the gas valve. This could be due to a lack of a command signal or a problem with the gas valve system.

This alarm means that heating stage 3 (HS3) is deactivated due to an issue with the gas valve. It could be related to the command signal for heating or the gas valve's operational status.

This alarm indicates a problem with the variable frequency drive (VFD) that controls the supply fan. It may occur if there is a fault within the VFD itself or if the electrical connection to it is interrupted.

This alarm is triggered when the 24 VAC power supply to the SDR input terminal on the SEC board is lost. This input is typically connected to a smoke detector circuit.

This is not an alarm, but an indicator that the system is currently using the return air sensor for temperature readings because it cannot recognize a space indoor temperature sensor.