Bunn LCA-2 LP 38791.0000K - Manual (Page 24)

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Field Calibration of the Concentrate Pumps & Dispenser Flow Rates
The factory set default values for the Pump & Dispenser Flow Rates are very accurate and typically do
not need to be field calibrated. However, if the mix ratio accuracy is ever in question, this procedure
can be used to recalibrate the unit in the field.
Equipment Required:
50 to 100 ml graduated cylinder, with 1 ml graduations.
1500 to 2000 ml graduated container.
NOTE: You can calibrate either the Concentrate Pump or the Dispenser Flow Rate independently.
Simply scroll through the menu screen to the desired section and perform only those steps. (refer to
Calibrating the Dispenser)
Calibrating the Concentrate Pumps.
Regular Coffee - Concentrate Pump Calibration
1. Open the door of the dispenser and select PROGRAM on the Mode Selector Switch.
2. Depress and Hold the MENU switch for approximately 10 sec. The unit will display “C1 run”
when it has entered the Calibration Mode.
3. Select PRIME on the Function Selector Switch.
4. Place a container under the left Dispense Tip and depress the Regular dispense switch until a
steady stream of concentrate comes out the tip (5 to 10 seconds).
5. Stop priming and allow the tip to stop dripping. Discard the concentrate collected.
6. Place a 50 ml graduated cylinder under the Left Dispense Tip.
7. Press & Hold the Regular dispense switch. The dispenser will display a 20 second count down
timer and then shut the pump OFF automatically. Release the dispense switch.
8. Keep the graduated cylinder under dispense tip until all the concentrate has dripped out.
9. Measure the volume of concentrate collected in the graduated cylinder.
The acceptable range for the volume of concentrate collected is 16 - 26 ml
10. If the amount collected is not within the acceptable range, empty the graduated cylinder and
repeat STEPS 6 – 9.
11. If the amount collected is still not within range, replace the pump tubing with a new Tube Kit,
(refer to the Tube Replacement Instructions).
12. When satisfied with the volume of concentrate collected, press the MENU switch. The current
Calibration volume “C1 XX” will be displayed.
13. Use the (-) / (+) keys to adjust number displayed to the amount measured in STEP 9.
Decaffeinated Coffee - Concentrate Pump Calibration
Depress the MENU switch to display the Decaffeinated Concentrate Pump calibration menu “C2
run”.
Repeat STEPS 3 – 13 above for the right side “Decaf” pump.
Calibrating the Dispenser Flow Rates.
Regular Coffee - Dispenser Flow Rate Calibration
1. Select RINSE on the Function Selector Switch.
2. Press the MENU switch to display the Regular Coffee Flow Rate calibration menu “C3 run”
3. Place a container under Left Dispense Tip and depress the Regular dispense switch until a
steady stream of water comes out the tip (5 to 10 seconds).
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