Bunn ITCB Series - Accessing the Inside of the Brewer; Filling System; Heating System

ITCB Training Manual
14
Accessing the Inside of the Brewer
The majority of service work to the ITCB brewer will require the removal of either the rear panel or the top panel. The
toppanelissecuredwith1atheadscrew.Therearpanelissecuredwitheither6,7or10atheadscrews,depend-
ing on the age of the machine.
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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 a sensing coil on the front of the machine.
In a digital tea brewer the control board takes the place of the liquid level control board, the timer board, the dilution
timer and the mechanical thermostat. All of these components are combined into a single unit.
Filling System
Thellsystemmaintainsthelevelofwaterinthebrewer’stank.Any-
time water is drawn off of the tank during a brew cycle or from the hot
wateroutlet,thellcircuitactivatestorellthetank.
Thellsystemconsistsof:
120VAC solenoid inlet valve•
Flow control•
Fill probe•
Waterenterstherearofthebrewerfromthesupplylineandrstgoes
through a plastic strainer mounted in the combination inlet solenoid/
dilutionsolenoidassembly.Fromthesolenoidvalvethewaterows
througha.50gallonperminuteowcontrolwasherandthenintothe
bottom of the water tank.
The 120VAC solenoid inlet valve is activated by the control board anytime the brewer calls for water. The valve opens
andallowswatertoow,underlinepressure,tothetankwherethesilicontubeconnectstoalltubeattachedto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.
Heating System
The heating system consists of:
Water tank•
Heating elements•
High-limit thermostats•
Temperature sensor•
DV switch•
The heating circuit maintains the water in the tank at a preset temperature this ensures that the water is always ready
for brewing.
TO DILUTION NOZZLE
TO T A NK
.50 GPM flow control
.50 GPM flow control Checkvalve
Drain clamp
Dilution solenoid
Inlet solenoid
inlet connection adapter