11-Switch Used on McDonnell No. 61 and All Built-In Type Low Water Cut-Offs
Wiring Diagrams for Low Water Cut-Offs with Only One Main Line Switch
The 11-switch is a common component used in McDonnell No. 61 and other built-in type low water cut-offs. This switch is responsible for controlling the flow of electricity to the burner circuits within the switch's electrical system. When the water level in the boiler falls below a certain point, the 11-switch opens, breaking the circuit and shutting off the burners.
The following wiring diagrams show how the 11-switch is typically connected to the other components in a low water cut-off system:
Diagram 1: Single-Pole, Single-Throw (SPST) 11-Switch
In this diagram, the 11-switch is a SPST switch, which means that it has two terminals and two positions. When the switch is in the "on" position, the circuit is closed and electricity can flow to the burner circuits. When the switch is in the "off" position, the circuit is open and electricity cannot flow to the burner circuits.
Diagram 2: Double-Pole, Single-Throw (DPST) 11-Switch
In this diagram, the 11-switch is a DPST switch, which means that it has four terminals and two positions. When the switch is in the "on" position, both circuits are closed and electricity can flow to the burner circuits. When the switch is in the "off" position, both circuits are open and electricity cannot flow to the burner circuits.
Diagram 3: Single-Pole, Double-Throw (SPDT) 11-Switch
In this diagram, the 11-switch is a SPDT switch, which means that it has three terminals and two positions. When the switch is in the "a" position, the circuit is closed and electricity can flow from terminal A to terminal B. When the switch is in the "b" position, the circuit is closed and electricity can flow from terminal A to terminal C.
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