ITB Training Manual
14
Accessing the Inside of the Brewer
The majority of service work to the ITB brewer will require the removal of either the rear panel or the top panel. The
top panel is secured with 1 flathead screw. The rear panel is secured with 7 flathead screws.
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 fulfill those demands. The main control board responds to the us
-
ers input through the membrane switch and activates and controls the brew cycle.
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 fill system maintains the level of water in the brewer’s tank. Anytime water is drawn off of the tank during a brew
cycle or from the hot water outlet, the fill circuit activates to refill the tank.
The fill system consists of:
•
120VAC dual solenoid inlet valve
•
Flow control
•
Fill probe and CBA
Water enters the rear of the brewer from the supply line and first goes
through a plastic strainer mounted in the combination inlet solenoid/
dilution solenoid assembly. From the solenoid valve the water flows
through a .50 gallon per minute flow 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 flow, under line pressure, to the tank where the silicon tube con
-
nects to a fill 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
The heating circuit maintains the water in the tank at a preset temperature this ensures that the water is always ready
for brewing.
