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OPERATION (continued)
7
WATER HEATER
Water temperature is sensed by an electronic water
temperature probe inserted into the water tank.
This temperature signal is fed to the controller.
The setpoint temperature is adjustable. The
controller sends a command signal to the power
board based upon a comparison between the
setpoint temperature and actual temperature.
See page 15.
The power board energizes the heating elements
based on the command signal from the controller.
Excessive temperature will trip the hi-limit safety
switch. The hi-limit will automatically reset when
the brewer cools.
WATER FLOW
POUR-OVER FEATURE
Pouring any amount of water into the pour-over
opening and into the basin pan forces an identical
amount of heated water out of the tank and through
the spray head.
AUTOMATIC OPERATION
Pressing the BREW key energizes the solenoid
valve, allowing 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.
The solenoid uses a flow control device so that
flow is consistent between 20 p.s.i. and 90 p.s.i.
The length of time the solenoid is open is controlled
by the time setting of the controller. See page 18.
After the solenoid closes, water will continue to flow
to the brew chamber until
the water level in the tank falls below the brew
pickup, breaking the siphon.
HOT WATER FAUCET
The faucet water coil is submerged in the hot water
tank and draws heat from the brew water. Water
going to the water coil is not controlled by the
solenoid valve.
Hot water is provided at the faucet, at supply water
pressure, any time the faucet shut-off valve is
OPEN
.
Fig. 6 Water Flow Diagram
Fig. 5 Heat Control Diagram
642 75872 Owners Manual E.B.C. Airpot /Thermal