Explain Controllers Flashcards
Define:Primary Controller
Sequences ignition and monitors flame
Define:Programming Controller
A primary control with programmable options like timed pre-purge, timed ignition trials, timed post purge
Define:Intermittent Pilot
Is ignited on a call for heat, stays lit for the run cycle and is extinguished at the end of the cycle
Define:Interrupted Pilot
Is ignited on a call for heat, lights the main burner then is extinguished while the burner continues the run cycle
Define:Pre-purge
A predetermined time that the blower will run pushing air through the combustion chamber and heat exchanger passes prior to any ignition
Define:Safe start check
On a call for heat the controller checks for presence of a flame and integrity of flame amplifier before starting any burner ignition sequencing functions
Define:Trial for ignition
A limited pre-determined time that the flame detector/amplifier must sense the ignition of a burner flame to allow the controller to continue sequencing.
Define:Flame Relay
A relay within the controller that is actuated once a flame is detected.
Define:Run time
The period of time after the main burner is ignited until the call for heat is satisfied.
Define:Flame failure response time
The limited time that the controller has to de-energize the Safety Shut-off Valves in respond to a loss of flame signal.
Define:Recycle
The normal restart of a controller.
Define:Recycling controller
A controller that will respond to a flame failure by attempting to recycle.
Define:Non Recycling Controller
A controller that will require manually resetting in response to a flame failure.
Define:Dynamic Self Check
A detector and amplifier that verifies its operation during a run cycle installed on burners that do not cycle within a 24 hr period.
Define:Safety Shut Down
When a controller is locked out and must be manually reset.
