Flame rods are found on nearly all induced draft burner systems and on many forced draft burners.
Flame rod sensor circuit.
It does this by generating a potential voltage at the flame sensing terminal this terminal is connected to the sensor with a conductor.
Also some tips for servicing.
A special metal rod is mounted in the path of the flame.
This one explains the electronics behind the flame rod control system.
Most every flame rod system i have worked on puts and ac voltage on the flame rod.
Flame sensing rods stick out into the flame and connect back to the furnace board.
In a nutshell the flame rectification system is an electrical process that causes a low level dc current to be conducted from the.
I am sensing a flame using a flame rod.
In a nutshell the flame rectification system is an electrical process that causes a low level dc current to be conducted from the.
To troubleshoot flame sensor.
When no flame.
The cpfs circuit 31 of the flame detector generates a comparable microampere dc current in response to a flame pulse signal in the 10 500 hz frequency range so that the uv flame detector can be used in place of a flame rod sensor with an existing burner control combustion safeguard circuit.
The sensor needs to be cool to the touch when you clean it so it doesn t melt the scotchbrite pad and leave a residue on the flame rod.
Flame rods are found on nearly all induced draft burner systems and on many forced draft burners.
It is essentially fail safe.
Connect a micro amp meter in series with this wire and the.
The flame rod in your picture is not a thermocouple.
Once the board sends a call to the gas valve to open it monitors the current flow on the flame sensing rod.
Proves flame at the point of ignition.
If abnormal situations exist such as open circuits short.
Disconnect the flame sensor wire from sensor.
Troubleshoot flame sensor the flame sensor in any furnace proves combustion.
If proof of flame is not present the icm will de energize the gas valve and retry for ignition or lockout.
After cleaning you should reinstall the flame sensor and take another reading in order to see how much you improved flame signal.
Depending on the system this voltage may be between 80 and 300 volts.
Because of the flexibility of positioning a flame rod a pilot flame can be proven at the point of intersection with the main flame.
This video is part of the heating and cooling series of.
This is known as a flame sensor or flame rod.
Quick response to flame failure.
I am using 12v ac at the input and at the output flame sensing circuit which is made of opamp some resistors and capacitors i get 1 6 2 4v when there is a flame and 3 8 4v when there is a short circuit and 5v when there is no flame.
Flame rods have the following advantages.
