To understand how the ignition sequence works we must first break it down into the types of systems. The first is the hot surface igniter type system (HSI) which is essentially a small electric heating element somewhat like an electric oven heating element.

The other common types are either an intermittent pilot where the pilot is lit when needed or a standing pilot where the pilot stays lit much like on a standard gas water heater. There is also one other type that is not very common on gas furnaces but is standard on most oil furnaces and that is the spark ignition.

Intermittent Spark or Standing Pilot Ignition

Intermittent Spark ignition Pilot Light Assembly For the Intermittent Pilot Ignition type, after the control board has confirmed that the inducer fan is in fact running or in the case with no inducer fan upon a call for heating the heating system will open the pilot gas valve which is part of the main gas valve assembly and send high voltage to the spark igniter.

Read more of this and other great articles at http://www.asi-heating-airconditioning.com/About_GasBurner_Ignition.html

Ameri-Serv, Inc.

Heating and Cooling

Facilities Services

13601 W. Mc Millan Rd. S/102-120

Boise, Idaho 83713

Ada County (208) 342 4328

Canyon County (208) 467-2665

http://www.asi-heating-airconditioning.com

http://www.asihvacr.com

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