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HOPPER DISPENSE RATE OF PRODUCT
The hopper dispense rates are preset at the factory. With 22 tooth gear and auger wire, the preset dispense
rate is approximately 3 to 5 grams per second. With 30 tooth gear and auger wire, the preset dispense rate is
approximately 5 to 7 grams per second. The hopper dispense rates can be individually programmed to a range
of dispense rates from approximately 1.5 to 12 grams per second, by following the procedures described in
Programming Modes.
HOPPER LEVEL SENSOR CALIBRATION
The dispenser is equipped with sensors to detect a low level in each hopper. When low powder lockout is
enabled, dispensing will be disabled when a low powder condition is detected in a hopper. The LCD screen on
the door will also display a low level condition.
The despenser is shipped from the factory with the low level powder lock disabled. To enable the lock,
place the "NORMAL/PROGRAM/RINSE" switch (page 10) in the "PROGRAM" position. Press button A (page
10) below the BUNN logo on the front of the door. Continue to press this button until the "LOCKS/DISABLES?"
menu is reached. Press button B (page 10} for "YES", then press it again in the "LOW POWDER LOCK?" menu.
The low powder lockout is now enabled. Press button C (page 10) to exit the program menus, then return the
"NORMAL/PROGRAM/RINSE" button to the "NORMAL" position. To disable the low powder lockout, repeat the
process, and press button D (page 10) for "NO", in the "LOW POWDER LOCK" menu.
The low level sensors are factory calibrated for most products. If calibration is required for proper opera-
tion, the sensors can be recalibrated to the current product.
The hopper must be at least half full of product for calibration. Place the "NORMAL/PROGRAM/RINSE"
switch in the "PROGRAM" position. Using button A (page 10), forward until the "CALIBRATION?" menu is
reached. Press button B (page 10) for "YES", then press button A (page 10) until "CAL HOPPER 1?" screen is
reached. Continue to press button A until the hopper to be calibrated is reached.
To calibrate the hopper, press button B (page 10) to indicate "YES" in the "CAL HOPPER#? screen. The
screen will then ask you if the hopper is full. Press the button again to indicate "YES". The calibration will then
take a few moments, then the screen will display "POWDER LEVEL RESET COMPLETE". The next hopper may
be calibrated by moving forward in the menu, or press button C (page 10) to exit.
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. Open front door and place ON/OFF/NIGHT switch in the "OFF" (center) position and let the water in the tank
cool before draining.
3. Shut off and disconnect the incoming water supply.
4. Remove the drip tray and access panels below the door.
5. Pull the clamped end of the silicone tube out of the dispenser and direct it into a drain or a container large
enough to hold the volume of water in the tank (7.3 gal for iMIX-4/5 and 4.4 gal for iMIX-3).
6. Make certain the shut off clamp is locked tightly on the tube, then remove the snap type clamp and plug from
end of tube.
7. Carefully release the shut off clamp to let the water drain from the tank.
NOTE - The dispenser must be refilled using the INITIAL FILL & HEAT steps before reconnecting to the power
source.
DOOR GRAPHIC AND LENS INSTALLATION
Remove the clear lens from the door of the machine. Place the door graphic into position and reinstall the
clear lens over the door graphic.
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