The K2A Rule Library is a collection of rules provided by WennSoft, including target filters, that can be instantiated and used as-is or in a modified fashion. If a K2A Rule is used as-is, when the rule is updated by WennSoft, the rule will automatically update with the latest information. If a K2A rule is used in a modified fashion, when the rule is updated by WennSoft, the rule will not be modified so as not to overwrite the customizations made by the user.The following table lists the available K2A Rules:
Rule Name | Description | Equipment/System Types | Required Sensor Types |
|---|---|---|---|
Air Filter Alarm | The air filter is dirty and needs to be replaced. | AHU (All Types), Heat Pump, RTU | Air Filter Alarm Status |
Ceiling Heat Stratification - High Discharge Air Temperature in Heating Mode (HWV) | Stratification in Ceiling Discharge and Return Applications ONLY Discharge Temperature is more than 15°F above the space temp in heating mode. | VAV (All Types), AHU (All Types), Unit Ventilator, Heat Pump (All Types), Fan Coil, Duct Reheat, Unit Heater | Supply Air Temperature Space Air Temperature Supply Valve Position Command Occupancy Command |
Chw_Chiller Failed | The chiller is in a diagnostic shutdown condition. | Chiller (All Types) | Alarm Status |
Chw_High Approach Temperature | The Chiller Approach Temperature is more than 6 deg during near full load conditions. | Chiller (All Types) | Compressor Capacity Supply Water Temperature Evaporator Saturated Refrigerant Temperature Enable |
Chw_High Chiller Power Usage | The Chiller Compressor Capacity is more than 110%. | Chiller (All Types) | Enable Compressor Capacity |
Chw_High Chw Delta T | The Chilled Water Delta Temp is greater than 10 degrees. | Chiller (All Types) | Supply Water Temperature Return Water Temperature Enable |
Chw_High Chw Temp | The Chiller's Supply Water Temperature is more than 3 degrees above the Supply Water Temperature Setpoint. | Chiller (All Types) | Supply Water Temperature Setpoint Supply Water Temperature Enable |
Chw_High Pressure | The Chiller's Supply Water Pressure is more than 10% above the Supply Water Pressure Setpoint. | Chiller (All Types) | Supply Water Pressure Supply Water Pressure Setpoint Enable |
Chw_High Tower Temp | The Leaving Tower Water Temp is more than 3 degrees above the setpoint. | Cooling Tower (All Types) | Supply Water Temperature Setpoint Supply Water Temperature Enable |
Chw_Low Ambient Operation | The Chiller is operating while the ambient air temperature is less than 50 deg and could support economizing. | Chiller (All Types) | Outside Air Temperature Enable |
Chw_Low Approach Temperature | The Chiller Approach Temperature is less than 4 deg during near full load conditions. | Chiller (All Types) | Compressor Capacity Supply Water Temperature Evaporator Saturated Refrigerant Temperature Enable |
Chw_Low Chiller Power Usage | The Chiller Compressor Capacity is less than 25%. | Chiller (All Types) | Enable Compressor Capacity |
Chw_Low Chw Delta T | The Chilled Water Delta Temp is less than 6 degrees. | Chiller (All Types) | Supply Water Temperature Return Water Temperature Enable |
Chw_Low Chw Temp | The Chiller's Supply Water Temperature is more than 3 degrees below the Supply Water Temperature Setpoint. | Chiller (All Types) | Supply Water Temperature Setpoint Supply Water Temperature Enable |
Chw_Low Pressure | The Chiller's Supply Water Pressure is more than 10% below the Supply Water Pressure Setpoint. | Chiller (All Types) | Supply Water Pressure Supply Water Pressure Setpoint Enable |
Chw_Low Tower Temp | The Leaving Tower Water Temp is more than 3 degrees below the setpoint. | Cooling Tower (All Types) | Supply Water Temperature Setpoint Supply Water Temperature Enable |
Chw_Tower Freeze Alert | The Tower Water Leaving is less than 38 deg. | Cooling Tower (All Types) | Supply Water Temperature |
Compressor Run Failure | The compressor is calling to run but is not running. | AHU (All Types), CRAC, CRAHU, Freezer, Heat Pump, RTU, Refrigerator, Split System | Compressor Command, Compressor Status |
Compressor Running When Unoccupied | The compressor has statuses on when equipment is unoccupied. | AHU (All Types), CRAC, CRAHU, Freezer, Heat Pump, RTU, Refrigerator, Split System | Compressor Status, Occupancy Command |
Damper Actuator Problem | Opening the damper is not increasing airflow, indicating that the damper is not moving properly. | VAV, Constant Volume Box | Supply Air Flow Delta over last hour, Supply Damper Position Command Delta over last hour |
Dirty Air Filter | The air filter is dirty and needs to be replaced. | AHU (All Types), Heat Pump, RTU | Air Filter Alarm Status |
Dirty Water Filter | The water filter is dirty and needs to be replaced. | Condenser Water | Water Filter Alarm Status |
Discharge Static Pressure is Low | Discharge Air Static Pressure is below the Discharge Air Static Pressure Setpoint by 30% or more. | AHU, Heat Pump, Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, Packaged Rooftop Unit. | Discharge Air Pressure Discharge Air Pressure Setpoint Occupancy Command |
Discharge Static Pressure is High | Discharge Air Static Pressure is above the Discharge Air Static Pressure Setpoint by 30% or more. | AHU, Heat Pump, Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, Packaged Rooftop Unit. | Discharge Air Pressure Discharge Air Pressure Setpoint Occupancy Command |
Domestic System Low Temperature | The supply water temperature from the domestic hot water system is below 122 degrees F. | Domestic Hot Water | Supply Water Temperature |
Domestic System Unsafe High Temperature | The supply water temperature from the domestic hot water system exceeds 150 degrees F. | Domestic Hot Water | Supply Water Temperature |
Duct Static Pressure Reset Failure | Supply Air Pressure Setpoint is a constant value over a 24-hour period, indicating no duct static pressure reset. | AHU (VAV) | Supply Air Pressure Setpoint Min for 1 hour, Supply Air Pressure Setpoint Max for 1 hour |
Economizer is enabled but not operating | Economizer mode enabled but not operating, unit is not in free cooling mode (Enable Status) | Packaged Rooftop Unit, AHU (Generic), AHU (Variable Volume), AHU (Constant Volume), Energy Recovery Unit | Economizer Damper Position Command Makeup Damper Position Command Supply Fan Command |
Economizer is operating when not enabled | Economizer mode is disabled but is operating in free cooling mode. | AHU (Constant Volume), Energy Recovery Unit, Packaged Rooftop Unit, AHU (Generic), AHU (Variable Volume) | Economizer Damper Position Command Makeup Damper Position Command |
Equipment Run Failure | Equipment is commanded on but is not running. | ALL | Command, Status |
Equipment Running More than 16 Hours Per Day | Equipment is running for more than 16 hours per day. | All | Status |
Equipment Running When Unoccupied | Equipment is running when not occupied to run. | ALL | Occupancy Command, Status |
Fan Failure | The fan is commanded On but the Fan Status indicates it's Off | AHU, Heat Pump, Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Supply Fan Command Supply Fan Status |
Fan On when not Commanded | The fan is running when commanded 'Off' | AHU, Heat Pump, Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Supply Fan Command Supply Fan Status |
Fan Status is False When Fan Command is True | The fan is commanded On but the Fan Status indicates it's Off. | Heat Pump, AHU (Generic), Exhaust Fan, Condensing Unit, Unit Heater, AHU (Constant Volume), Cooling Tower, Ductless Split System, Water Source Heat Pump, AHU (Variable Volume), Blower Coil, Fan Coil, Evaporative Condenser, VAV (Fan Powered - Series), Packaged Rooftop Unit, VAV (Fan Powered - Parallel), Unit Ventilator, Cooling Tower (Closed Loop), Energy Recovery Unit, AHU (Generic), AHU (Constant Volume), VAV (Reheat), Energy Recovery Unit | Supply Fan Command Supply Fan Status |
High Average Return CO2 | Return CO2 average levels are above the active/effective return CO2 setpoint | AHU (Variable Volume), AHU (Constant Volume), AHU (Generic), Energy Recovery Unit, Packaged Rooftop Unit | Motion Sensor Status Return Air CO2 Return Air CO2 Setpoint |
High Average Space CO2 | Space CO2 average levels are above the active/effective space CO2 setpoint | VAV (Fan Powered - Parallel), VAV (Cooling Only), Energy Recovery Unit, VAV (Reheat), VAV (Generic), Packaged Rooftop Unit, VAV (Fan Powered - Series), AHU (Generic), Exhaust Fan, VAV (Dual Duct), AHU (Constant Volume), Fan Coil, AHU (Variable Volume) | Motion Sensor Status Space Air CO2 Space Air CO2 Setpoint |
High Condenser Approach | Condenser approach temperature is in excess of 4 degrees, indicating fouled tubes. | Chiller | Condenser Leaving Water Temperature, Condenser Saturated Refrigerant Temperature, Enable, Compressor Capacity |
High Discharge Air Temperature in Cooling Mode w/ DAT setpoint | The cooling component is "ON" and the discharge temperature is more than 5°F above the effective discharge temperature setpoint. | Packaged Rooftop Unit, VAV (Dual Duct), Blower Coil, VAV (Reheat), AHU (Variable Volume), AHU (Generic), AHU (Constant Volume), Energy Recovery Unit, VAV (Generic), Water Source Heat Pump, VAV (Cooling Only), Ductless Split System, VAV (Fan Powered - Series), VAV (Fan Powered - Parallel), Unit Ventilator, Fan Coil | Supply Air Temperature Supply Air Temperature Setpoint Cooling Command Occupancy Command |
High Discharge Air Temperature in Cooling Mode w/ DAT Setpoint (CHW) | The Chilled Water Valve is open more than 50% and the discharge temperature is more than 5°F above the effective discharge temperature setpoint. | VAV (Fan Powered - Parallel), Fan Coil, Ductless Split System, AHU (Generic), Unit Ventilator, VAV (Fan Powered - Series), VAV (Generic), Duct Reheat, Packaged Rooftop Unit, AHU (Constant Volume), VAV (Cooling Only), AHU (Variable Volume), Blower Coil, VAV (Dual Duct), Water Source Heat Pump, VAV (Reheat), Energy Recovery Unit | Supply Air Temperature Supply Air Temperature Setpoint Cooling Valve Position Command Occupancy Command |
High Discharge Air Temperature in Cooling Mode w/out DAT Setpoint (CHW) | The Chilled Water Valve is open more than 50% and the Discharge Temperature is less than 5°F below the space temp. | VAV (Cooling Only), Blower Coil, Unit Ventilator, AHU (Generic), VAV (Fan Powered - Parallel), AHU (Constant Volume), AHU (Variable Volume), Packaged Rooftop Unit, VAV (Fan Powered - Series), VAV (Generic), VAV (Dual Duct), Energy Recovery Unit | Supply Air Temperature Cooling Valve Position Command Space Air Temperature Occupancy Command |
High Discharge Air Temperature in Heating Mode with DAT setpoint (HWV) | Discharge air temperature is above discharge air setpoint by 5°F or more. | Duct Reheat, VAV (Fan Powered - Parallel), VAV (Generic), AHU (Constant Volume), AHU (Generic), Unit Heater, Blower Coil, Unit Ventilator, VAV (Reheat), Packaged Rooftop Unit, VAV (Fan Powered - Series), AHU (Variable Volume), Fan Coil, VAV (Dual Duct), Energy Recovery Unit | Supply Air Temperature Supply Valve Position Command Supply Air Temperature Setpoint Occupancy Command |
High Discharge Air Temperature in Heating Mode w/out DAT setpoint | Heating is "ON" and the discharge air temperature is more than 30°F above the space temperature. | VAV (Fan Powered - Series), Duct Reheat, VAV (Generic), VAV (Cooling Only), Unit Heater, Energy Recovery Unit, AHU (Generic), VAV (Dual Duct), AHU (Constant Volume), Blower Coil, Ductless Split System, VAV (Reheat), Packaged Rooftop Unit, AHU (Variable Volume), VAV (Fan Powered - Parallel), Fan Coil | Supply Air Temperature Heating Load Space Air Temperature Occupancy Command |
High Discharge Air Temperature in Heating Mode w/out DAT setpoint (HWV) | Hot Water Valve is greater than 30% and the discharge temperature is more than 30°F above the space temperature. | VAV (Generic), AHU (Variable Volume), AHU (Constant Volume), Duct Reheat, Unit Ventilator, AHU (Generic), VAV (Dual Duct), Fan Coil, VAV (Fan Powered - Parallel), Blower Coil, VAV (Fan Powered - Series), Packaged Rooftop Unit, Unit Heater, VAV (Reheat), Water Source Heat Pump, Energy Recovery Unit | Supply Air Temperature Space Air Temperature Supply Valve Position Command Occupancy Command |
High Max Return CO2 | The maximum reading for return CO2 levels is above the return CO2 setpoint | AHU (Generic), Energy Recovery Unit, AHU (Variable Volume), Packaged Rooftop Unit, AHU (Constant Volume) | Occupancy Command Return Air CO2 Return Air CO2 Setpoint |
High Max Space CO2 | The maximum reading for space CO2 levels is above the space CO2 setpoint | AHU (Variable Volume), Exhaust Fan, VAV (Cooling Only), Packaged Rooftop Unit, VAV (Fan Powered - Parallel), Fan Coil, VAV (Fan Powered - Series), Energy Recovery Unit, VAV (Reheat), VAV (Generic), AHU (Generic), AHU (Constant Volume), VAV (Dual Duct) | Occupancy Command Space Air CO2 Space Air CO2 Setpoint |
High Mixed Air Temperature during Economizing | Economizing is enabled and the mixed air temperature is above the mixed air setpoint. | Packaged Rooftop Unit, AHU (Generic), Energy Recovery Unit, AHU (Constant Volume), AHU (Variable Volume) | Economizer Damper Position Command Outside Air Temperature Mixed Air Temperature Setpoint Mixed Air Temperature Occupancy Command |
High Outside Airflow | Outside Airflow is above the Outside Airflow Setpoint by 25% or more. | AHU, Heat Pump, Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), | Occupancy Command Outside Airflow Outside Airflow Checkpoint |
High Preheat Leaving Temperature in Preheat mode | Preheat leaving air temperature is above preheat temperature setpoint by 5°F or more | Packaged Rooftop Unit, Energy Recovery Unit, AHU (Constant Volume), AHU (Variable Volume), Fan Coil, AHU (Generic), Unit Ventilator, Blower Coil | Preheat Air Temperature Preheat Air Temperature Setpoint Outside Air Temperature Occupancy Command |
High Relative Humidity no Setpoint | The space humidity is above 60% | Water Source Heat Pump, AHU (Generic), AHU (Variable Volume), VAV (Dual Duct), Unit Ventilator, Duct Reheat, Fan Coil, VAV (Reheat), Unit Heater, VAV (Fan Powered - Parallel), VAV (Cooling Only), Blower Coil, Ductless Split System, Energy Recovery Unit, Packaged Rooftop Unit, AHU (Constant Volume), VAV (Fan Powered - Series), VAV (Generic) | Space Air Relative Humidity |
High Relative Humidity with RH Setpoint | Space humidity is above the humidity setpoint | VAV (Fan Powered - Series), VAV (Dual Duct), AHU (Variable Volume), Fan Coil, Unit Heater, AHU (Generic), VAV (Reheat), VAV (Cooling Only), Ductless Split System, Water Source Heat Pump, Unit Ventilator, Energy Recovery Unit, Blower Coil, VAV (Generic), Packaged Rooftop Unit, AHU (Constant Volume), Duct Reheat, VAV (Fan Powered - Parallel) | Space Air Relative Humidity Space Air Relative Humidity Setpoint Occupancy Command |
High Return Airflow | Return Airflow is above Return Airflow Setpoint by 25% or more. | AHU, Heat Pump, Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), | Occupancy Command Return Airflow Return Airflow Checkpoint |
High Return CO2 Levels | Reading for return CO2 levels is above the return CO2 setpoint | AHU (Constant Volume), AHU (Variable Volume), Packaged Rooftop Unit, AHU (Generic), Energy Recovery Unit | Occupancy Command Return Air CO2 Return Air CO2 Setpoint |
High Space CO2 Levels | Reading for space CO2 levels is above the space CO2 setpoint | VAV (Fan Powered - Parallel), VAV (Reheat), Energy Recovery Unit, Exhaust Fan, VAV (Cooling Only), VAV (Fan Powered - Series), AHU (Variable Volume), Fan Coil, VAV (Dual Duct), VAV (Generic), AHU (Generic), Packaged Rooftop Unit, AHU (Constant Volume) | Occupancy Command Space Air CO2 Space Air CO2 Setpoint |
High Space Temperature Cooling Setpoint | Space Temperature is above the active/effective space setpoint by 3°F or more. Space Temperature is above the occupied cooling set point by 3°F or more. | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Space Temperature Occupancy Command Occupied Cooling Setpoint |
High Space Temperature Single Setpoint | Space Temperature is above the active/effective space setpoint by 3°F or more. | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Space Temperature Occupancy Command Space Temperature Setpoint |
High Space Temperature Unoccupied Cool Setpoint | Space Temperature is above the unoccupied cooling setpoint by 3°F or more. | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Space Temperature Occupancy Command Unoccupied Cooling Setpoint |
High Space Temperature Single Unoccupied Setpoint | Space Temperature is above the unoccupied setpoint by 3°F or more. | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Space Temperature Occupancy Command Space Temperature Setpoint |
High Supply Airflow | Supply Airflow is above the Supply Airflow Setpoint by 25% or more. | AHU, Heat Pump, Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Supply Airflow Supply Airflow Checkpoint Occupancy Command |
HtgChw_High Water Flow | The Water Flow is more than 10% above the Water Flow Setpoint. | Water Boiler, Heat Exchanger (Water), Chiller (Air Cooled), Chiller (Water Cooled) | Supply Water Flow Setpoint Supply Water Flow Enable |
HtgChw_Low Water Flow | The Water Flow is more than 10% below the Water Flow Setpoint. | Chiller (Air Cooled), Water Boiler, Chiller (Water Cooled), Heat Exchanger (Water) | Supply Water Flow Setpoint Supply Water Flow Enable |
Isolation Sequence Failure | The chiller is disabled and isolation valves are open, passing water unnecessarily through an inactive chiller. | Chiller | Enable, Isolation Valve Command |
Leaking Chilled Water Supply Valve | When the valve is at a closed position, supply water is still leaking by the valve, indicating it is not fully closed. | Chilled Water | Supply Valve Position Command, Supply Water Temperature, Return Water Temperature, Enable |
Leaking Hot Water Supply Valve | When the valve is at a minimum position, supply water is still leaking by the valve, indicating it is not fully closed. | Hot Water | Supply Valve Position Command, Supply Water Temperature, Return Water Temperature, Enable |
Leaking Supply Damper | When the damper is at a closed position, airflow is still being read. | VAV, Constant Volume Box | Supply damper position command, Supply air flow. |
Not Economizing in Low OA Conditions | Outside Air Conditions are favorable for economizing, but economizing is currently disabled. | AHU (All Types), RTU | Economizer mode command, outside air temperature |
Low Discharge Air Temperature in Cooling Mode w/ DAT Setpoint | Discharge Air Temperature is below discharge air setpoint by 5°F or more. | Water Source Heat Pump, Unit Ventilator, VAV (Dual Duct), AHU (Generic), Packaged Rooftop Unit, Ductless Split System, Energy Recovery Unit, AHU (Variable Volume), VAV (Generic), Fan Coil | Supply Air Temperature Supply Air Temperature Setpoint Cooling Load Occupancy Command |
Low Discharge Air Temperature in Heating Mode w/ DAT Setpoint | Discharge Air Temperature is below discharge air setpoint by 5°F or more. | AHU (Generic), Unit Heater, Fan Coil, Water Source Heat Pump, AHU (Constant Volume), VAV (Fan Powered - Parallel), VAV (Reheat), Duct Reheat, AHU (Variable Volume), VAV (Dual Duct), Ductless Split System, VAV (Fan Powered - Series), Energy Recovery Unit, Packaged Rooftop Unit, VAV (Generic), Blower Coil, Unit Ventilator | Supply Air Temperature Supply Air Temperature Setpoint Heating Load Occupancy Command |
Low Discharge Air Temperature in Heating Mode w/ DAT Setpoint (HWV) | Discharge air temperature is below discharge air setpoint by 5°F or more. | VAV (Generic), VAV (Fan Powered - Parallel), Packaged Rooftop Unit, Unit Ventilator, Blower Coil, AHU (Variable Volume), Unit Heater, Water Source Heat Pump, VAV (Fan Powered - Series), Energy Recovery Unit, AHU (Constant Volume), VAV (Reheat), Ductless Split System, Duct Reheat, Fan Coil, VAV (Dual Duct) | Supply Air Temperature Supply Valve Position Command Supply Air Temperature Setpoint Occupancy Command |
Low Discharge Air Temperature in Heating Mode w/out DAT Setpoint | Heating Command is "ON" and the Discharge Air Temperature is less than 15°F above the space temp. | AHU (Constant Volume), Duct Reheat, VAV (Fan Powered - Parallel), VAV (Reheat), VAV (Fan Powered - Series), Blower Coil, Ductless Split System, Unit Ventilator, AHU (Variable Volume), VAV (Generic), Energy Recovery Unit, VAV (Dual Duct), Water Source Heat Pump, Packaged Rooftop Unit, Fan Coil, Unit Heater | Supply Air Temperature Space Air Temperature Heating Command Occupancy Command |
Low Discharge Air Temperature in Heating Mode w/out DAT Setpoint (HWV) | Hot Water Valve is 50% or more and the Discharge Air Temperature is less than 15°F above the space temp. | Water Source Heat Pump, Unit Ventilator, Duct Reheat, AHU (Constant Volume), VAV (Fan Powered - Parallel), Unit Heater, VAV (Generic), Blower Coil, VAV (Reheat), VAV (Dual Duct), AHU (Variable Volume), Ductless Split System, Packaged Rooftop Unit, VAV (Fan Powered - Series), Energy Recovery Unit, Fan Coil | Supply Air Temperature Space Air Temperature Supply Valve Position Command |
Low Mixed Air Temperature | Mixed Air Temperature is below the Mixed Air setpoint | Energy Recovery Unit, AHU (Variable Volume), AHU (Constant Volume), Packaged Rooftop Unit, Blower Coil, Fan Coil, Unit Ventilator, AHU (Generic) | Mixed Air Temperature Mixed Air Temperature Setpoint |
Low Outside Airflow | Low Outside Airflow is below the Outside Airflow Setpoint by 25% or more. | AHU, Heat Pump, Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Outside Airflow Outside Airflow Checkpoint Occupancy Command |
Low PreHeat Leaving Temperature in Preheat mode | Preheat leaving air temperature is below preheat setpoint by 5 deg F or more | Packaged Rooftop Unit, Unit Ventilator, Blower Coil, Fan Coil, AHU (Generic), AHU (Variable Volume), AHU (Constant Volume), Energy Recovery Unit | Preheat Air Temperature Preheat Air Temperature Setpoint Outside Air Temperature |
Low Relative Humidity no Setpoint | Space humidity is below 35% relative humidity | VAV (Reheat), AHU (Variable Volume), AHU (Generic), Packaged Rooftop Unit, VAV (Generic), Fan Coil, VAV (Dual Duct), Unit Heater, VAV (Cooling Only), Water Source Heat Pump, Unit Ventilator, Ductless Split System, Duct Reheat, Energy Recovery Unit, VAV (Fan Powered - Series), VAV (Fan Powered - Parallel), Blower Coil, AHU (Constant Volume) | Space Air Relative Humidity |
Low Return Airflow | Return Airflow is below Return Airflow Setpoint by 25% or more. | AHU, Heat Pump, Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Return Airflow Return Airflow Checkpoint Occupancy Command |
Low Return CO2 Levels | Return CO2 levels are below ambient CO2 levels. | AHU (Variable Volume), Packaged Rooftop Unit, AHU (Constant Volume), Energy Recovery Unit, AHU (Generic) | Return Air CO2 |
Low Space CO2 Levels | Space CO2 levels are below ambient CO2 levels. | VAV (Generic), AHU (Variable Volume), Exhaust Fan, AHU (Constant Volume), AHU (Generic), Fan Coil, VAV (Fan Powered - Parallel), Packaged Rooftop Unit, VAV (Fan Powered - Series), VAV (Reheat), VAV (Cooling Only), VAV (Dual Duct), Energy Recovery Unit | Space Air CO2 |
Low Space Temperature Occupied Heating Setpoint | Space temperature is below the occupied heating set point by 3°F or more. | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Space Temperature Occupancy Command Occupied Heating Setpoint |
Low Space Temperature Single Setpoint | Space temperature is below the active/effective setpoint by 3°F or more. | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Space Temperature Occupancy Command Space Temperature Setpoint |
Low Space Temperature Unoccupied Setpoint | Space temperature is below the unoccupied setpoint by 3°F or more. | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Space Temperature Occupancy Command Space Temperature Setpoint |
Low Supply Airflow | Supply Airflow is below Supply Airflow Setpoint by 25% or more. | AHU, Heat Pump, Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), | Supply Airflow Supply Airflow Checkpoint Occupancy Command |
Modulating Heating without Discharge Air Temperature Setpoint, Low Discharge Air Temperature | Heating Command is 50% or more and the discharge air temperature is less than 15°F above the space temperature. | VAV (Dual Duct), AHU (Constant Volume), AHU (Generic), Ductless Split System, VAV (Generic), Packaged Rooftop Unit, VAV (Reheat), VAV (Cooling Only), Unit Ventilator, AHU (Variable Volume), VAV (Fan Powered - Series), Water Source Heat Pump, Unit Heater, VAV (Fan Powered - Parallel), Fan Coil, Blower Coil, Duct Reheat, Energy Recovery Unit | Supply Air Temperature Space Air Temperature Supply Valve Position Command Occupancy Command |
Occupied Cooling Set Point Out of Range | VAV | ||
Occupied Cooling Setpoint Too High | The occupied cooling setpoint is above the recommended value of 76°F | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Occupied Cooling Setpoint |
Occupied Cooling Setpoint Too Low | The occupied cooling setpoint is below the recommended value of 72°F | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Occupied Cooling Setpoint |
Occupied Heating Set Point Out of Range | VAV | ||
Occupied Heating Setpoint Too High | The occupied heating setpoint is above the recommended value of 72°F | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Occupied Heating Setpoint |
Occupied Heating Setpoint Too Low | The occupied heating setpoint is below the recommended value of 68°F | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Occupied Heating Setpoint |
Return CO2 is above ASHRAE guideline | Return CO2 levels are above the CO2 guidelines set by ASHRAE | AHU (Generic), Packaged Rooftop Unit, AHU (Variable Volume), Energy Recovery Unit, AHU (Constant Volume) | Return Air CO2 |
Space CO2 is above ASHRAE guideline | Reading for space CO2 levels is above the space CO2 setpoint | VAV (Generic), Packaged Rooftop Unit, AHU (Constant Volume), Energy Recovery Unit, AHU (Generic), Fan Coil, VAV (Dual Duct), VAV (Fan Powered - Series), VAV (Cooling Only), Exhaust Fan, AHU (Variable Volume), VAV (Fan Powered - Parallel), VAV (Reheat) | Space Air CO2 |
Supply Air Temperature Reset Failure | The supply air temperature setpoint is constant over a 24-hour period, indicating no supply air temperature reset. | AHU (VAV) | Supply Air Temperature Setpoint Min for 1 hour, Supply Air Temperature Setpoint Max for 1 hour |
Supply Water Temperature Reset Failure | Supply Water temperature setpoint is constant over a 24-hour period, indicating no supply Water temperature reset. | Chilled Water, Hot Water, Domestic Hot Water | Supply Water Temperature Setpoint Min for 1 hour, Supply Water Temperature Setpoint Max for 1 hour |
System High Differential Pressure | The differential pressure in the system exceeds the setpoint by 20% | Chilled Water, Hot Water | differential water pressure, differential water pressure setpoint |
System Low Differential Pressure | The differential pressure in the system is less than the setpoint by 20% | Chilled Water, Hot Water | differential water pressure, differential water pressure setpoint |
Unoccupied Cooling Set Point Out of Range | VAV | ||
Unoccupied Cooling Setpoint Too High | The unoccupied cooling setpoint is above the recommended value of 82°F | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Unoccupied Cooling Setpoint |
Unoccupied Cooling Setpoint Too Low | The unoccupied cooling setpoint is below the recommended value of 82°F | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Unoccupied Cooling Setpoint |
Unoccupied Heating Set Point Out of Range | VAV | ||
Unoccupied Heating Setpoint Too high | The unoccupied heating setpoint is above the recommended value of 65°F | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Unoccupied Heating Setpoint |
Unoccupied Heating Setpoint Too Low | The unoccupied heating setpoint is below the recommended value of 55°F | Ductless Split System, Water Source Heat Pump, Blower Coil, Fan Coil, Unit Ventilator, Unit Heater, VAV (Dual Duct), VAV (Parallel), VAV (Series), VAV (Fan Powered - Parallel), VAV (Fan Powered - Series), Packaged Rooftop Unit. | Unoccupied Heating Setpoint |
Valve Actuator Problem - Cooling | Opening the cooling valve is not cooling, indicating that the valve is either not moving properly or a clogged strainer. | Chilled Water | Supply Water Temp Delta over last hour, Supply Valve Position Command Delta over last hour |
Valve Actuator Problem - Heating | Opening the heating valve is not heating, indicating that the valve is not moving properly or a clogged strainer. | Hot Water | Supply Water Temp Delta over last hour, Supply Valve Position Command Delta over last hour |
VAV Parallel Fan Failure (Control Failure) | Fan status is off when the space temperature is less than the occupied heating setpoint | VAV (Fan Powered - Parallel) | Supply Fan Command Occupancy Command Space Air Temperature Occupied Heating Setpoint Space Air Temperature |
VAV Parallel Fan Failure (Low Discharge Air Temperature) | The parallel fan is "ON" but the discharge air temperature is cool.\n | VAV (Fan Powered - Parallel) | Supply Air Temperature Supply Fan Command |
VAV Parallel Fan Failure Unoccupied (Control Failure) | Fan status is off when the space temperature is less than the unoccupied heating setpoint.\n\n | VAV (Fan Powered - Parallel) | Supply Fan Command Occupancy Command Space Air Temperature Space Air Temperature Unoccupied Heating Setpoint |
Water Differential Pressure Reset Failure | The Water Differential Pressure setpoint is constant over a 24-hour period, indicating no Water Differential Pressure reset. | Chilled Water, Hot Water, Domestic Hot Water | Water Differential Pressure Setpoint Min for 1 hour, Water Differential Pressure Setpoint Max for 1 hour |
Water System High Temperature | The supply water temperature in the system exceeds its setpoint by 3 degrees. | Chilled Water, Hot Water, Condenser Water | supply water temp, supply water temp setpoint |
Water System Low Temperature | The supply water temperature in the system is below its setpoint by 3 degrees. | Chilled Water, Hot Water, Condenser Water | supply water temp, supply water temp setpoint |