CONTROL COMPONENTS

THE CONTROL SYSTEM

The R7910A1138 is a burner control system that provides heat control, flame supervision, circulation pump control, fan control, boiler control sequencing, and electric ignition function. It will also provide status and error reporting.

Figure 5.  BURNER CONTROL SYSTEM

SPARK IGNITER

The spark igniter is a device that ignites the main burner. When power is supplied to the igniter electrode, an electric arc is created between the electrode and the ground terminal which ignites the main burner.

Figure 6.  SPARK IGNITER

LOW/HIGH GAS PRESSURE SWITCH

This XP boiler is equipped with a low gas pressure switch which meets the CSD-1 code requirements.

The Low Gas Pressure Switch is normally open and remains open unless the pressure falls below the preset pressure.

The High Gas Pressure Switch is normally closed and is used to detect excessive gas pressure.

Figure 7.  LOW/HIGH GAS PRESSURE SWITCH

GAS VALVE

The gas valve is a normally closed servo regulated gas valve. The valve opens only when energized by the burner control and closes when the power is removed. The burner control supplies 24 volts to the gas valve during operation.

Figure 8.  GAS VALVE

WATER FLOW SWITCH

The water flow switch activates when sufficient water flow has been established. Switch will not close when water flow is not present.

Figure 9.  WATER FLOW SWITCH

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A.O. Smith 2600, 3400, 1700, 2000 instruction manual Control Components

3400, 1700, 2000, 2600 specifications

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