Bunn My Cafe AP, Техническое учебное пособие

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My Caf é AP Training Manual
26
TEST SWITCHES?
NO YES
Test Switches
TEST SWITCHES will give you the option of pressing the control switch individually
and displaying the switch name on the display screen for switch recognition. Pressing
the “Hidden Switch” will exit and advance you to the next screen.
Enter the “TEST SWITCHES” menu by selecting “Yes”. Depress the corresponding switch to be tested and the dis-
play will show the switch name on the display. The switch is working properly when the name of the switched being
pressed displays on the LCD. When a switch name doesn’t appear on the LCD while pressing the switch, the switch
on the display/switch board is defective. The pod bin magnetic reed switch can be checked by removing the pod bin
from the unit. The display will read “Pod Waste Bin Removed”/ You exit the menu by depressing the hidden program
menu button.
Set Refill
This function allows the operator to adjust the sensitivity of the refill circuit and to view the
condition of water and refill probe of lime scale build-up. This is mainly a troubleshooting
feature. Water in different geographical locations can have different conductivities. By
adjusting (range 20 - 230) the sensitivity of the refill circuit, this will allow the brewer to operate under various water
conditions.
The level probe senses the water level in the tank by the conductance of minerals in the water grounding out the very
low AC voltage applied to the probes. A high reading (approximately 255) indicates water is not touching, or not con-
ductive enough to ground the circuit. A low reading (0-2) indicates the probe is grounded. Left side is the actual read-
ing and the right side is the adjustable refill threshold. BUNN constant refill threshold is set at 155 from the factory.
How to set a new refill threshold number when water is less conductive or has low TDS.
The highest known number is 255 for an open circuit. Take the actual water reading number and subtract it from 255.
Now take the difference and divide it by two = xx. Add the divided number onto the actual reading number and now
this becomes your new refill threshold setting number. See example below. Water reads 80 and factory refill thresh -
old is set at 155.
255 - 80 = 175
175/2 = 87.5
87 + 80 = 167 (This now becomes the new Refill Threshold number)
Note: Always make sure the number on the right is larger than the number on the left when water is contacting the
tank refill probe.
XXX REFILL 155
(-) (+)
DONE