Control Strategy

Control logic or strategy that is programed into the system.

Data Type: 
Constrained List
Unit of Measure: 
Commercial, Residential, Multifamily
List Options Option Definition Unit of Measure
Adaptive compensation Lowering illuminance at night in spaces, based on research indicating that people both need and prefer less light at night than during the day. For example, in applications with long hours of operationg during the night, such as airports and 24-hour retailers, this can produce significant energy savings. Also known as night setback. None
Always on None
Astronomical time clock A device that provides a signal to turn a load on or off or adjust power in steps based on the time of day or based on astronomical events such as sunset or sunrise, accounting for geographical location and day of the year. Also known as astronomical time clock. None
Auto power down The capability to automatically switch a device from On Mode to Sleep Mode after a predetermined period of time (APD timing) has elapsed. APD timing begins when both: 1) The device has ceased performance of all Primary Functions, and 2) The last user input has been received (e.g., remote control signal, volume adjustment). If either a Primary Function resumes or a user input is received, the APD timing will reset. The intent of APD is that products will automatically power down into Sleep Mode when they are not being adjusted by the user and are not performing a Primary Function. None
Automatic shut off A device capable of automatically turning loads off without manual intervention. None
Average flow None
Bi level A lighting control strategy that provides two light levels - one at full-ON or at a high light level and one at a lower level. This may include turining off some portion of the lighting that unfiorm light level and distribution is maintained. In addition to the two ON settings, bi-level control may provide for full-OFF. Also known as bi-level switching. None
Carbon dioxide sensor Control based on a carbon dioxide sensor None
Coldest reset The coldest reset strategy is used in dual duct systems to reset the setpoint temperature of the air in the heating supply duct. Usually it is used in conjunction with a warmest reset strategy resetting the temperature of the air in the cooling supply duct. For each zone in the system at each system timestep, the control logic calculates a supply air temperature that will meet the zone heating load at the maximum zone supply air flow rate. The highest of the possible supply air temperatures becomes the new supply air temperature setpoint, subject to minimum and maximum supply air temperature constraints. The resulting temperature setpoint is the lowest supply air temperature that will meet the heating requirements of all the zones. When compared to a fixed heating supply air temperature setpoint, this strategy minimises central boiler energy consumption (if the hot water temperature is also reset or there are variable speed pumps) at the cost of possible increased fan energy (if there is variable volume control in the air system). None
Continuous None
Continuous dimming A lighting control strategy that varies the light output of a lighting system over a continuous range from full light output to a minim light output without flickering in imperceptible steps. None
Continuous dimming plus off Lighting can be continuously dimmed from full power to minimum power and can also be turned off None
Controlled Generic control strategy None
Critical zone None
Daylight dimming None
Daylight hours The time period from 30 minutes after sunrise to 30 minutes before sunset None
Daylighting Control based on some aspect of daylighting None
Demand None
Demand control ventilation Demand control ventilation (DCV) is a ventilation system capability that provides for the automatic reduction of outdoor air intake below design rates when the actual occupancy of spaces served by the system is less than design occupancy. None
Demand response Load shedding initiated by the energy provider None
Differential None
Dimmable Capable of being dimmed None
Direct digital control Direct digital control (DDC) is a control system that uses digital processors to directly control HVAC equipment. Such a system may be specific to the equipment controlled with pre-set programs, or be a separate system that has customizable programs. For multi-zone systems, the DDC system must Òreport to a central control panelÓ or bring together information from each zone. None
Dual maximum logic Dual maximum logic comes from the fact that there are two maximum airflow setpoints: one for heating in addition to the one for cooling. None
Electronic An electronic control uses solid state electronic circuitry to provide the proper starting and operating electrical conditions to power equipment. None
Fixed None
High end trim A lighting control strategy that that sets the required maximum light level for each space. None
Load shedding A control strategy for selectively reducing the loaad of a system on a temporary basis to reduce energy usage. A building manager or system may utilize load shedding to avoid peak pricing or to avoid a condition where electricity demand exceeds supply. None
Lumen maintenance A lighting control strategy that adjusts lamp power over time to maintain constant light output as lamps age, dirt accumulates in luminaires, or both.This strategy allows for energy savings early in the life of a system then increases power as the system ages. Also known as lumen deprecation compensation. None
Manual Manual operation of on and off switch. None
Manual dimming None
Max cells None
Min cells None
Multi level A lighting control strategy that provides multiple light levels None
None None None
Not applicable Not applicable None
Occupancy sensor Control based on an occupancy sensor None
On off switching A lighting control strategy that turns a luminaire or group of luminaires on or off using manual or automatic methods. None
Other Other None
Outside air reset None
Programmable Or scheduled None
Recirculation None
Recirculation control None
Reheat Reheat control strategy. Use additional qualifiers (e.g., dual maximum logic) to clarify None
Scheduled None
Single maximum logic With single maximum logic the damper will remain at the minimum airflow rate during heating operation. As the heating load increases, the water flow rate in the reheat coil will be increased to maintain temperature in the zone until the maximum water flow rate is reached or the user-specified maximum reheat air temperature is reached. None
Staged setpoint None
Static pressure reset Resetting duct static pressure to keep it only as high as is needed to satisfy the neediest zone. None
Stepped dimming Lighting can be dimmed in discrete steps None
Supply air temperature reset Resetting the supply-air-temperature set point based on the outside air temperature None
Temperature None
Time delay A time delay switch that includes a specified delay interval end time None
Time switch A device that controls lighting, equipment, or systems based on the time of day - typically used for time scheduling stratgies. Also known as time clock. See also astronomical time switch None
Timer None
Tuning A lighting control strategy in which the light output of an individiaul or group of luminaires is set to provide the desired amount of light for a space, task or area. While tuning is sometimes accomplished using high-end trim, the light levels are generally lower utilizing tuning than the high-end trim levels. Also known as task tuning. None
Two position flow None
Unknown Unknown None
Variable flow None
Warmest reset None
Wet Bulb reset None
Term ID: 8cdcbaa7-36c4-4ae7-80cc-ac4d16a31a40