What is CAD cell relay?
The cad cell causes the relay to switch the oil burner off when a flame is not established during oil-burner startup (“trial for ignition or TFI” in some manuals) or if oil burner flame is later lost at the oil burner (or inside the furnace or boiler’s combustion chamber).[2]
What part does the CAD cell play in the safe operation of an oil fired furnace?
The cadmium sulfide cell, or cad cell, is part of the primary control system and is used to sense the presence of the oil burner flame. This detector is mounted in the air tube of the burner in such a way as to sight the flame.
What is a CAD cell dredging?
CAD cells are specially designed holes dug in the harbor floor that are then filled with sediment contaminated by toxic polychlorinated biphenyls (PCBs). CAD cells 1 and 2 were dug as part of what is known as navigational dredging.
How does a CAD cell sense the flames?
The Cad Cell on your EnergyLogic Waste Oil Heater or Boiler senses the flame by detecting light in the visible spectrum, and is an important safety-feature of your EnergyLogic Waste Oil Burner.
What is the response that a CAD cell makes to change in light?
On a call for heat, with the burner running, the cad cell senses the light of the flame. If it stops sensing the light of the flame, it causes the red button to trip, shutting down the burner before any significant damage can be done.
What are the 4 wires on a thermostat?
4 Wire Thermostat Wiring (Heat Pumps, HVAC)
- Red wire for power (24V).
- White wire for heating (connected to W or W1 terminal).
- Green wire for fans.
- Blue or yellow wire for cooling (connected to Y).
What happens if you wire thermostat wrong?
Potential consequences of improper installation could include: Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself.
What is a confined aquatic disposal cell?
Confined aquatic disposal (CAD) cells are constructed to reduce the risk from unacceptably contaminated sediments (UCSs) by storing them in a depression in the bottom of an aquatic system (Figure 1).
What is ignition transformer?
The ignition transformer takes 120 volts AC and transforms it into 10,000 volts AC to ignite the oil droplets. There are a number of ways to test the output voltage of the transformer. With 120 volts input to the transformer, the output should be approximately 10,000 volts.
How does the Cad Cell relay reset the oil burner?
If the oil burner is operating normally and you press the cad cell relay reset button down it should turn off the oil burner. When you release the button the oil burner should re-start. This oil burner safety test checks the interrupt circuit in the cad cell relay.
Where is the Cad Cell relay button located?
Look closely at the mostly-covered gray cover of this Honeywell cad cell relay control. In the upper center of the photo you can just see a hole in the top of the cover. Marked by an orange arrow, this is where we should have seen a red cad cell relay button.
What to do if your Cad Cell relay is stuck?
If the red “reset” button on the cad cell relay is sticking up and the oil burner has shut down, the homeowner is permitted to try ONCE to “reset” the system by pressing the red reset button.
When to use a cad cell sensing flame?
Once the burner is running and the flame is established, the cad cell must have a low resistance (cad cell sensing flame) to keep the primary control from locking out on safety. What if the burner will not start and the cad cell is suspected?