Bunn Dual SH BrewWISE, Техническое учебное пособие

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Dual SH BrewWISE ® Training Manual
14
To remove the front panel, fi rst remove the funnels and servers from the machine. The front panel is secured to the
brewer with 11 standard screws. Remove the screws and pull the panel straight off of the unit.
The server base plate is secured to the body of the brewer with 4 standard screws, 2 on each side. Remove these
four screws and slide the base plate forward. Before removing the base plate from the machine, the wires will need
to be disconnected from the server contacts.
Machine Function and Operations
Main Control Board
The main control is the brain of the brewer. In the Digital Brewer Control (DBC
®
) system, the control board is the
single component that contains all of the programming software, it interprets all the data it receives from the level
and temperature sensors and activates components to ful
fi ll those demands. The main control board responds to the
users input through the membrane switch and activates and controls the brew cycle. The control board can receive
data from Smart Funnels
®
through the sensing coils on the front of the machine.
The control board is interchangeable between the single and dual brewers. There is jumper located on the board to
select either single or dual with dual being default.
In a digital brewer the control board takes the place of the liquid level control board, the timer board, and the me-
chanical thermostat. All of these components are combined into a single unit.
Filling System
The fi ll system maintains the level of water in the brewer’s tank. Anytime
water is drawn off of the tank during a brew cycle, the fi ll circuit activates to
re fi ll the tank.
The fi ll system consists of:
120V solenoid inlet valve •
Fill probe •
Over fl ow cup •
Water enters the brewer through the water supply line and enters the chas-
sis through copper tubing. The water
fl ows through a strainer assembly;
this strainer contains a fi ne mesh screen to keep any large particles from
entering the inlet valve. It is important to note that there is no fl ow control
device in this strainer. From the strainer the water fl ows to the fi ll solenoid;
there is a built in water hammer arrestor on the line between the strainer
and the solenoid valve.
The 120VAC solenoid inlet valve is activated by the control board anytime
the brewer calls for water. The valve opens and allows water to
fl ow, under
line pressure, to the top of the tank where the silicon tube connects to an
stainless steel
fi ll tube. The fi ll tube runs to the bottom of the tank where
the incoming water enters the tank.
The control board monitors the level of water in the tank through a low
voltage level probe mounted to the top of the tank. The control board
grounds a 2.5VAC signal to the tank through the water. If it looses this
signal, the control board will activate the inlet valve.
The brewer features an over fl ow safety system for the fi ll circuit. There
is a tube mounted on the top of the tank that will drain water if the tank
fi lls to the top and continues to fi ll. The water will drain into the over fl ow
cup; there is a fl oat switch in the cup. When this switch fl oats to its top position
this signals the control board to deactivate the fi ll circuit and heating circuit.
Hammer
Arrestor
Fill Tube
Strainer
Solenoid
Float Switch