How many ohms should an igniter have?

How many ohms should an igniter have?

Resistance should be between 37-68 ohms. If the igniter and the surrounding air are at about 70°F and the igniter wires are not connected to any other electrical components, the resistance of the igniter should not exceed 75 ohms. If it does, the igniter should be replaced.

How many amps should a hot surface ignitor draw?

Check the amp draw of the igniter; amperage should not exceed 4.75 A.

How do you test a bad ignitor?

Here are a few steps to check your ignitor and determine if it needs to be replaced.

1. Make Sure The Furnace As At Room Temperature.
2. Turn Off The Furnace.
3. Switch Off Circuit Breaker.
4. Remove Furnace Service Panel.
5. Look For Visible Damage.
6. Remove Ignitor Wires From Socket.
7. Test The Ignitor With A Multimeter.

What’s the resistance of a hot surface igniter?

It’s almost as common as replacing a capacitor in air conditioning systems all over the city every spring. Hot surface igniters are a resistance element made of silicon carbide or silicon nitride. Anywhere from 80 to 240 volts are applied to the wires attached to the igniter.

Which is better silicon nitride or silicon carbide igniters?

The newer Silicon Nitride igniters are much more durable and are much tougher to break. They are easy to recognize by their smooth non-porous surface. They also use less energy to operate than the old SC igniters and they will normally outlast the SC igniters by 2 -7 times.

What causes silicon carbide igniters to fail?

Grease or dirt can cause premature failure. They are available with different ceramic bases but most of the silicon carbide elements are the same and one thing they all have in common is that they fail more than any other part of the furnace. Exact replacements from the OEM are thought to be the easiest way to replace these SC igniters.

What makes a hot surface igniter glow orange?

Hot Surface Igniters are Resistance Heaters As mentioned earlier, hot surface ignitors, or HSI’s, are resistance heaters. The element itself glows orange when the voltage is applied. How hot that element gets depends on the voltage being applied to it.