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THEORY OF OPERATION (continued)
Heat Control Diagram
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
10ºF.
The element is protected from over-temperature
by a hi-limit thermostat, which breaks line power if
the temperature exceeds 260ºF.
The Ready-To-Brew light glows any time the
thermostat is not calling for heat.
BREW WATER TEMPERATURE CONTROL
Typical Heating System Electrical Configuration
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