Heater Repair San Francisco- Thermocouple and Burners

In most of the heaters the burners are the most important part which creates the heat. Burners in oil and gas furnaces are the final operator of the 24-volt control circuit. This circuit opens and closes the automatic gas valve or turns the oil burner on and off. The burner turns on when the contacts in the thermostat and the high-limit control are closed (touching one another). Both sets of contacts must be closed at the same time. The contacts in high-limit controls are always closed unless the furnace reaches a dangerously high temperature. The contacts in the thermostat close when the temperature in the room drops below the thermostat's set point. If the contacts in the thermostat or the contacts in the high-limit controls are open, electricity can't flow through the circuit and turn on the burner. Some gas and propane furnaces with draft boosters also have centrifugal safety switches (with another set of contacts that must be closed for electricity to flow) that won't allow burner ignition unless the booster fan is operating. If there is something wrong then Heater Repair San Francisco is necessary.

The pilot safety thermocouple is a separate circuit. The pilot light heats the thermocouple, a rod that generates a small electric current. The current energizes a magnetic valve stem called a sole-noid in the automatic gas valve. The solenoid keeps the passageway open for the flow of gas to the pilot light and the burners, in case the thermostat calls for heat. If the pilot light goes out or if the thermocouple fails, the current stops flowing. A spring then returns the valve stem to the valve seat, like a cork in the neck of a bottle, insuring that gas can't flow to the pilot light or gas burner. Newer furnaces have hot-surface ignition. A fork-shaped igniter (a heating element) ignites the burner flame that burns in contact with that igniter. Problem with igniter would also require Heater Repair San Francisco technician help.

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