Tags: Primary Control

Combination Primary Control and Aquastat

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Combination Primary Control and Aquastat

The combination primary control and aquastat is designed for use with a constant-ignition oil burner in a hydronic heating system. The purpose of this unit is to supervise the operation of the oil burner and provide both water temperature and circulator control. A remote sensor (cadmium detection cell) is used to detect any irregularities in …

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Stack Detector Primary Control

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Stack Detector Primary Control

Stack-mounted oil burner primary controls employ thermal sensors to detect ignition or flame failure. A typical stack detectorthermal sensor (see Figure 5-87) consists of a bimetal element inserted into the stack (see Figure 5-88). The thermal sensor (combustionthermostat) is usually located on the stack where the elementwill be exposed to the most rapid temperature changes. …

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Servicing a Gas Burner Primary Control

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Servicing a Gas Burner Primary Control

Access to the wiring terminals of the primary control illustrated in Figure 5-4 is obtained by loosening the screws that secure the chassis to the base. When remounting the chassis, be sure to tighten all mounting screws because they also serve as electrical connections. No attempt should be made to repair a primary control except …

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Gas Burner Primary Control

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Gas Burner Primary Control

The primary control shown in Figure 5-4 is a solid-state electronic relay used on gas, oil, or combination gas-oil burners. It is designed to provide operational control of the burner in response to the room thermostat and limit controls, and to instantly shut off the burner in the event of flame failure. Figure 5-5 illustrates …

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