THEORY OF OPERATION (continued)
BREW WATER TEMPERATURE CONTROL
Typical Heating System Electrical Configuration
The heating elements are energized when line
power is applied to the element terminals.
Water temperature is sensed by a thermobulb inserted into the water tank. This temperature
signal is fed to the thermostat by a capillary tube. An increase in temperature causes an increase in
pressure in the thermobulb. This will cause the pressure diaphragm in the thermostat to open the
line power contacts. A decrease in temperature
will similarly cause the pressure diaphragm to close the contacts.
The setpoint (desired temperature) is adjustable
by turning the thermostat shaft. Turning the shaft
1/8 turn will change the setpoint by approximately Heat Control Diagram
10ºF.
The element is protected from
The
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