Bunn LCA-1 Installation & Operating Manual page 11

CALIBRATION OF THE CONCENTRATE PUMP & DISPENSER FLOW RATE
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 reca-
librate the unit in the field.
Equipment Required:
50 ml graduated cylinder, with 1 ml graduations.
1000 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.
Calibrating the Concentrate Pumps.
1. Open the door of the dispenser and select PROGRAM on the Selector Switch. The display should show PPP.
2. Depress and Hold both Up & Down arrows switch for approximately 15 sec. The unit will display "1 run"
when it has entered the Calibration Mode.
3. Select PRIME on the Selector Switch.
4. Place a container under the dispense tip and depress the 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 Dispense Tip.
7. Press & Hold the dispense switch. The dispenser will display a 20 second count down timer and then shut
the pump OFF automatically. You can abort the calibration and stop the pump by releasing the 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, 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) and restart this procedure.
12. When satisfied with the volume of concentrate collected, press the Down Arrow switch. The current Calibra-
tion volume "1 XX" will be displayed.
13. Use the (-) or (+) keys to adjust the number displayed to the amount measured in STEP 9.
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CALIBRATION OF THE CONCENTRATE PUMP & DISPENSER FLOW RATE
Calibrating the Dispenser Flow Rates.
1. Select RINSE on the Selector Switch.
2. Press the Down Arrow switch to display the Flow Rate calibration menu "2 run"
3. Place a container under dispense tip and depress the dispense switch until a steady stream of water comes
out the tip (5 to 10 seconds).
4. Stop dispensing and allow the tip to stop dripping. Discard the water collected
5. Place a 1000 ml graduated container under dispense tip.
6. Press & Hold the dispense switch. The dispenser will display a 20 second count down timer and then stop
dispensing automatically. You can abort the calibration and stop the dispense by releasing the switch.
7. Keep the graduated container under dispense tip until all the water stops dripping.
8. Measure the volume of water collected in the graduated container.
The acceptable range for the volume of water collected is 700 to 820 ml
9. If the amount of water collected is not within the acceptable range, empty the graduated container and repeat
STEPS 5 – 8.
10. If the amount collected is still not within range, inspect the dispense valves, tubing and mix chamber for lime,
kinks or other obstructions.
11. When satisfied with the volume of water collected, press the Down Arrow switch. The current Water Calibra-
tion volume "2 .XX0" will be displayed.
12. Use the (-) or (+) keys to adjust number displayed to the amount measured in STEP 8 in Liters, (not ml).
DRAINING THE HOT WATER TANK
CAUTION: The dispenser must be disconnected from the power source throughout these steps.
1. Disconnect the dispenser from the power source.
2. Shut off and disconnect the incoming water supply.
3. Remove the rear access panel.
4. Close the tube clamp on the hose from the inlet valve to the tank.
5. Remove the hose from the inlet fitting and direct it into a 150 Oz (4.5L) or larger container.
6. Open the tube clamp. Continue draining tank until ALL of the water is out. Be careful when draining the water
as it may be very hot.
7. Reconnect the tube to the inlet valve.
8. Leave the tube clamp open and replace the rear access panel.
Note: The dispenser must be refilled using the Initial Fill & Heat steps before reconnecting the power source.
08, October 2014
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RELEASED FOR PRODUCTION
44806.1 081211