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OPERATION (continued)
WATER HEATER
Water temperature is sensed by a thermobulb
inserted into the water tank. This temperature
signal is fed to the mechanical thermostat.
The temperature setpoint is adjustable. Heating
element is energized by the thermostat.
Excessive temperature will trip the hi-limit safety
switch. The hi-limit will automatically reset when
the brewer cools.
WATER FLOW
Fig. 4 Heat Control Diagram
AUTOMATIC OPERATION
Pressing the BREW switch starts the timer, which
in turn energizes the solenoid valve. This allows
water from an external water supply to flow into
the water tank. The incoming water forces heated
water out of the tank to perform the brew.
Additionally, a portion of the unheated water is
bypassed into the dispenser to dilute and cool the
brew. The proportion of water delivered to the
brew versus the amount water diverted to dilution
is controlled by a restrictor in the bypass line, and
an adjustable needle valve in the brew water line.
The solenoid uses a flow control device so that
flow is consistent between 20 p.s.i. and 90 p.s.i.
Fig. 5 Water Flow Diagram
The length of time the solenoid is open is
controlled by the timer setting.
7
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