OPERATION (continued)
WATER HEATER
Separate coffee brew water and faucet water
heater systems are identical. Each heating
element is protected from over-temperature
by a manual reset hi-limit safety thermostat.
Water temperature is sensed by a
thermobulb inserted into each water tank.
This temperature signal is fed to the
corresponding thermostat, which controls
line power to that tank's heating element.
The temperature setpoint is adjustable at the
thermostat.
WATER FLOW
AUTOMATIC COFFEE BREW
Pressing BREW button energizes the
solenoid valve, allowing water from an
external water supply to flow into the basin
pan and then into the hot water tank. This
forces an identical amount of hot water out
of the tank and through the spray head into
the brew chamber
The solenoid uses a flow control device so
that flow is consistent between 20 p.s.i. and
90 p.s.i.
Length of time the solenoid is open is
controlled by the timer.
HOT WATER FAUCET
Water level in the faucet water tank is sensed
by an electronic probe. When no water is
sensed at the probe, the controller energizes
the faucet side of the fill solenoid.
NOTE:
The faucet is gravity fed from a tap in the
tank.
Fig. 6 Water Flow Diagrams
Fig. 5 Heat Control Diagram
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