Ads
related to: furnace starts then stops again when trying to turn signalexplorefrog.com has been visited by 10K+ users in the past month
assistantfish.com has been visited by 10K+ users in the past month
doublescout.com has been visited by 10K+ users in the past month
Search results
Results from the WOW.Com Content Network
Digital outputs are typically relay contacts used to start and stop equipment, and analog outputs are typically voltage or current signals to control the movement of the medium (air/water/steam) control devices such as valves, dampers, and motors. Groups of DDC controllers, networked or not, form a layer of systems themselves.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
A flame detector is a sensor designed to detect and respond to the presence of a flame or fire, allowing flame detection.Responses to a detected flame depend on the installation, but can include sounding an alarm, deactivating a fuel line (such as a propane or a natural gas line), and activating a fire suppression system.
Control systems that include some sensing of the results they are trying to achieve are making use of feedback and can adapt to varying circumstances to some extent. Open-loop control systems do not make use of feedback, and run only in pre-arranged ways. Closed-loop controllers have the following advantages over open-loop controllers:
AOL Mail welcomes Verizon customers to our safe and delightful email experience!
This is the same as "COR" ("close on rise"). May be used to start a fan when it is becoming hot, and to stop the fan when it has become cold enough. "NC" stands for "normally closed". This is the same as "OOR" ("open on rise"). May be used to start a heater when it is becoming cold, and to stop the heater when it has become warm enough.
Ads
related to: furnace starts then stops again when trying to turn signalexplorefrog.com has been visited by 10K+ users in the past month
assistantfish.com has been visited by 10K+ users in the past month
doublescout.com has been visited by 10K+ users in the past month