Bunn Dual TF BrewWISE DBC Guía para resolver problemas descargar pdf (Pagina 16)

TF BrewWISE

Training Manual

Heating System

The heating system consists of:

• Water tank

• Heating elements

• Triacs

• Contactor (3 phase only)

• 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. Water for brewing is contained in a stainless steel tank. A Dual BrewWISE tank contains 2 heating

elements (3 heating elements if equipped for 3 phase) that are powered by the line voltage into the machine. A single

BrewWISE tank will contain 1 heating element. Each heating element is controlled by the control board through tri-

acs. Each heating element circuit has a limit thermostat that will interrupt the circuit if the water in the tank overheats.

BrewWISE units without a neutral will have an internal step-down transformer and a 2-pole contactor. The step-down

transformer is a 204/240-120VAC transformer.

For 3-phase operation, the 2-pole contactor is used in the heating circuit in addition to a triac for controlling the ele-

ments. The contactor will control 2 heating elements while the triac will control the 3rd. During heating all 3 elements

will be energized. Once the temperature is within 2°F of target, the CPU will open the contactor and the remaining

element, controlled by the triac, will heat and maintain the water precisely at the programmed target temperature.

If a BrewWISE unit has the capability for 3 phase operation, but is installed to operate in single phase, the center

heating element and L3 position of the terminal block will not be used.

The control board monitors the water in the tank by a temperature sensor that is in contact with the water.

This temperature sensor is a digital thermistor; the control board reads the temperature as value of resis-

tance. The temperature sensor allows the control board to trigger the two heating element triacs when the

temperature drops below its programmed value and shut down the trigger voltage when the water tem-

perature reaches the programmed holding value.

Tank Heater Triac

Dual Tank

3rd Heating Element for

3 Phase goes here.

Single Tank

Limit Thermostat

Heater Triac

Tank Heater

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Bunn Dual TF BrewWISE DBC Guía para resolver problemas Pagina 16