Bunn POWDER AUTO FILL service manual Adjustments

ADJUSTMENTS

When using the Powder Auto-Fill with a new powdered granita mix, follow the procedure outlined below to adjust the Powder Auto-Fill to produce the correct recipe.

1.Determine the mix ratio of powdered granita mix. Convert the recipe so that it is expressed in terms of weight units [grams (g), dry ounces (oz), or pounds (lbs)] of powdered granita mix to fluid ounces (fl.oz.) of water [1 gallon (gal) = 128 fl.oz.; 1 liter (l) = 33.8 fl.oz.].

2.The delivery rate of the water ingredient is factory preset to 1 fl.oz. per second. Therefore, it is only necessary to adjust the delivery rate of the pow- dered granita mix. Adjustment is accomplished as follows:

a) Place the Powder Auto-Fill on top of a fully assembled CDS taking care to align the Powder Auto-Fill guide rails over the rollers on the CDS guide rails.

b) Connect the Powder Auto-Fill power cord to the outlet located on the CDS auger motor cover.

c) Attach a flexible water line to the .25" flare fitting on the back panel of the Powder Auto-Fill.

NOTE: A water strainer assembly (BUNN-O-MATIC #23820.1000) should be installed in line prior to the flexible water line.

d)On the CDS control panel, make the following switch settings:

i)POWER- "ON"

ii)DAY/NIGHT- "DAY"

e)Pull the Powder Auto-Fill fully forward on its support rails

f)Fill the Powder Auto-Fill product hopper as fol- lows:

i)Pull the slide gate closed on the Powder Auto- Fill product hopper elbow and remove the product hopper from the Powder Auto-Fill.

ii)Remove the lid from the product hopper and fill the hopper with a powdered granita mix.

iii)Install the product hopper into the Powder Auto-Fill.

g)Place the ON/OFF switch at the Powder Auto-Fill whipper panel to "ON".

h)After allowing 5 seconds for the Powder Auto-Fill to initialize, observe the door lamp on the whipper panel. The door lamp should not be lit. If the door lamp is lit, consult the fault list and clear the fault before proceeding.

i)Remove the hole plug on the whipper panel. Using a screwdriver, set potentiometer to approxi- mately mid range.

j)Remove the mixing chamber from the Powder Auto-Fill and place a small container, such as a cup, under the product hopper ejector elbow.

k)Push the slide gate on the product hopper ejector elbow to the OPEN position.

l)Momentarily set the TEST/SERVICE switch on the whipper panel to the TEST position.

m)The hopper motor will run and dispense pow- dered granita mix for 10 seconds.

n)After the Powder Auto-Fill has finished the 10 second throw test, weigh the dispensed product.

o)Determine the dispense rate of the powdered product (weight units per second) by dividing the measured weight by 10.

p)Compare the measured dispense rate with the mix ratio in step 1.

q)Adjust the MIN/MAX control clockwise to in- crease the dispense rate or counterclockwise to decrease the dispense rate of the powdered granita mix.

r)Repeat steps l through q as necessary until proper mix ratio is achieved.

s)Replace the mixing chamber removed in step j. Replace hole plug.

3.Once the mix ratio has been adjusted, the Powder Auto-Fill can be run with the door open to allow the user to catch dispensed product for brix testing as follows:

a)Hold a container under the dispense tip of the Powder Auto-Fill.

b)Hold the TEST/SERVICE switch on the whipper panel to the SERVICE position.

c)When the container is filled to the desired level, release the TEST/SERVICE switch.

d)Measure the brix using the appropriate measur- ing device.

e)Remove the hole plug. Using a screwdriver, adjust the potentiometer clockwise to increase the brix or counterclockwise to decrease the brix of the product. Replace the hole plug.

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