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 Source
Always on n/a
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. N/A
Average flow N/A
Bi level N/A
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). N/A
Continuous dimming Lighting can be continuously dimmed from full power to minimum power n/a
Continuous dimming plus off Lighting can be continuously dimmed from full power to minimum power and can also be turned off n/a
Controlled Generic control strategy n/a
Critical zone N/A
Daylight dimming N/A
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. N/A DOE
Differential N/A
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. N/A DOE
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. N/A
Electronic An electronic control uses solid state electronic circuitry to provide the proper starting and operating electrical conditions to power equipment. N/A
Fixed N/A
Manual Manual operation of on and off switch. n/a
Manual dimming n/a
Max cells N/A
Min cells N/A
Multi level N/A
Outside air reset N/A
Pneumatic N/A
Programmable Or scheduled N/A
Recirculation N/A
Reheat n/a
Reheat Reheat control strategy. Use additional qualifiers (e.g., dual maximum logic) to clarify N/A
Scheduled N/A
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. N/A
Staged setpoint N/A
Static pressure reset Resetting duct static pressure to keep it only as high as is needed to satisfy the neediest zone. N/A
Stepped dimming Lighting can be dimmed in discrete steps n/a
Supply air temperature reset Resetting the supply-air-temperature set point based on the outside air temperature N/A
Two position flow N/A
Variable flow N/A
Warmest reset N/A
Wet Bulb reset N/A
Term ID: 8cdcbaa7-36c4-4ae7-80cc-ac4d16a31a40