Red Seal Plumbing Practice Exam

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What mandatory device is required on a coil type boiler over?

Pressure relief valve
Flow switch
Limit control
Circulation pump

The correct answer is: Flow switch

The flow switch is a mandatory device for coil type boilers in order to ensure proper functioning and avoid potential hazards. The pressure relief valve is necessary for steam boilers, not coil type boilers. The limit control is used in other types of boilers to control and monitor the temperature. The circulation pump is also used for some types of boilers but is not mandatory for a coil type boiler over.