Bunn FMD-3 User Manual

FMD-3

(S/N FMD0013000-UP)

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: [phone] FAX: [phone]

29170.0000E 01/06 © 1998 Bunn-O-Matic Corporation

INTRODUCTION

This equipment dispenses hot beverages or soup on demand from powdered product. It has three hoppers.
This equipment may also dispense cold beverages from powdered product from the left dispense station. It is
for indoor use only on a sturdy counter or shelf.

WARRANTY

Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects
in material and workmanship existing at the time of manufacture and appearing within one year from the date of
installation. In addition:

1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and

workmanship for two years from the date of installation.

2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material

and workmanship for two years from the date of installation.

3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory

screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.

This warranty does not apply to any equipment, component or part that was not manufactured by Bunn or that,
in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation, improper
maintenance or repair, damage or casualty.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR
ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of Bunn are

not authorized to make modifications to this warranty or to make additional warranties that are binding on Bunn.
Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and should not
be relied upon.

The Buyer shall give Bunn prompt notice of any claim to be made under this warranty by telephone at (217)
529-6601 or by writing to Post Office Box 3227, Springfield, Illinois, 62708-3227. If requested by Bunn, the Buyer
shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole
discretion, that the equipment does not conform to the warranty, Bunn shall repair the equipment with no charge
for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during
the warranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, replace the
equipment or refund the purchase price for the equipment.

THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE
OF THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AS
SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, REPLACEMENT OR REFUND.

In no event shall Bunn be liable for any other damage or loss, including, but not limited to, lost profits, lost sales,
loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute
equipment, facilities or services, or any other special, incidental or consequential damages.

2

29170 032900

USER NOTICES

Carefully read and follow all notices on the equipment and in this manual. They were written for your protection.

All notices are to be kept in good condition. Replace any unreadable or damaged labels.

28301.0003

00831.0000

28328.0000

This equipment must be installed to comply with the
Basic Plumbing Code of the Building Officials and
Code Administrators International, Inc. (BOCA) and
the Food Service Sanitation Manual of the Food and
Drug Administration (FDA). For models installed
outside the U.S.A., comply with the applicable
Plumbing /SanitationCode.

00656.0000

MECHANICAL THERMOSTAT

28368.0000

160°

-

+

TEMPERATURE

ADJUSTMENT

120VAC

190°

HEATER

26527.0002

THERMOSTAT ASSEMBLY

BUNN-O-MATIC CORP

®

ELECTRONIC THERMOSTAT

26536.0002

3

29170 011906

INITIAL SET-UP

1. Locate the drip tray assembly above the dispenser nested in the packing material.

2. Remove the drip tray and the drip tray cover and set them aside.

3. Remove the water strainer assembly from the drip tray and set it aside.

4. Remove the four legs from the packaging material, apply non-skid pads to the bottom of the legs and securely

install the legs in the dispenser base.

ELECTRICAL REQUIREMENTS

CAUTION - The dispenser must be disconnected from the power source until specified in

The 120 volt version of this dispenser has an attached cordset. The mating connector must be a NEMA 5-15R.
The 120/208 volt and the 120/240 version of this dispenser has an attached cordset. The mating connector must
be a NEMA 14-20R.
The 240 volt version of this dispenser has an attached cordset without plug.

Initial Set-Up.

ELECTRICAL HOOK-UP

CAUTION - Improper electrical installation will damage electronic components.

1. An electrician must provide electrical service as specified.

2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.

3. Open the front door of the dispenser and place the heater switch in the “OFF” (upper position).

4. Connect the dispenser to the power source.

5. If plumbing is to be hooked up later be sure the dispenser is disconnected from the power source. If

plumbing has been hooked up, the dispenser is ready for

Initial Fill & Heat.

PLUMBING REQUIREMENTS

This dispenser must be connected to a COLD WATER system with operating pressure between 20 and 90 psi (138
and 620 kPa) from a 1⁄2" or larger supply line. A shut-off valve should be installed in the line before the dispenser.
Install a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345kPa). The
water inlet fitting is 1⁄4" flare.
NOTE - Bunn-O-Matic recommends 1⁄4" copper tubing for installations of less than 25 feet and 3⁄8" for more than
25 feet from the 1⁄2" water supply line. At least 18 inches of an FDA approved flexible beverage tubing, such as
reinforced braided polyethylene or silicone, before the dispenser will facilitate movement to clean the countertop.
Bunn-O-Matic does not recommend the use of a saddle valve to install the dispenser. The size and shape of the
hole made in the supply line by this type of device may restrict water flow.

This equipment must be installed to comply with the Basic Plumbing Code of the Building
Officials and Code Administrators International, Inc. (BOCA) and the Food Service Sanita­tion Manual of the Food and Drug Administration (FDA). For models installed outside the
U.S.A., you must comply to the applicable Plumbing/Sanitation Code for your area.

PLUMBING HOOK-UP

1. Securely attach the short piece of tubing on the water strainer assembly to the inlet fitting on the bottom of

the dispenser.

2. Flush the water line and securely attach it to the flare fitting on the water strainer assembly.

3. Turn on the water supply.

4

29170 011906

INITIAL FILL & HEAT

CAUTION - The dispenser must be disconnected from the power source throughout the initial fill & heat, except

when specified in the instructions.

1. Turn on the water supply and connect the dispenser to the power source.

2. Water will automatically flow into the tank to the proper level and then shut off. This will take less than five
minutes.

3. When the tank is full of water, open the front door and place the heater switch in the “ON” (lower) position.
A tank full of cold water will take approximately forty minutes for the water to heat on 120 volt versions, and
twenty minutes on 120/240 and 240 volt versions.

During this waiting period, complete these dispenser set-up steps:

a. Place a set of keyholes in the splash panel over the screws beneath the hopper access door and push down
gently.
b.Place the drip tray onto the supports on the splash panel. Hook the tabs on the rear of the drip tray through
the holes in the splash panel. Set the drip tray cover in place.
c. Fill the hopper(s) with the dry product to be dispensed.

LIQUID LEVEL CONTROL

The system automatically maintains the hot water tank’s level by energizing the refill solenoid when the water level
drops below the liquid level probe. If the system has not successfully refilled in 7 1/2 minutes, a refill error occurs.

When a refill error occurs, the refill solenoid is de-energized and the rinse L.E.D. will flash about once every 5
seconds.

Once the cause of the refill error has been investigated (see the troubleshooting guide) and cured, the system can
be reset by disconnecting (for at least 5 seconds) and then reconnecting the power to the machine.

RINSE TIMER

The dispenser is shipped from the factory with the rinse timer disabled. To enable the rinse timer, remove
power from the dispenser, remove the lower access panel, and remove the jumper from J1 of the control
board. Replace the lower access panel, and return power to the dispenser.

When enabled, the rinse timer automatically keeps track of the time since the dispenser was last run through a
rinse sequence. If the dispenser detects that a rinse sequence has not been run for 8 hours, the rinse L.E.D. will
flash continually. If, after an additional 4 hours (12 hours total), a rinse sequence has still not been run, the rinse
L.E.D. will light continuously, and the hopper drives will be disabled until a rinse sequence has been run.

RUNNING A RINSE SEQUENCE

1. Place the rinse/run switch in the rinse position.

2. Sequentially, or simultaneously, at each of the three positions dispense for at least 10 seconds.

3. After the rinse L.E.D. has extinguished, the rinse timer is reset.

4. Return the rinse/run switch to the run position.

DISPENSER USE

1. Simply place a cup on the drip tray beneath the desired dispensing tip.

2. Press the button to froth and dispense the beverage.

3. Release the button when the cup is approximately 2/3 full and allow the mixing chamber to drain.

NOTE - The mixing chamber must drain at the end of each dispense.

5

29170 091598

COLD BEVERAGE SET-UP (OPTIONAL)

Cold beverages may be dispensed from the left dispense position. Simply place the HOT/COLD switch near the
left whipper chamber in the “COLD” (upper) position.

CLEANING

Refer to the decal inside the hopper access door for cleaning recommendations and procedures.
The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all
surfaces on Bunn-O-Matic equipment.

ADJUSTMENTS

The hot or cold beverage solenoids are preset to dispense approximately 9/
be adjusted:

1. Disconnect the dispenser from the power source.

2. Remove the small left side access panel.

3. Rotate the control at the base of the desired solenoid(s) clockwise to decrease or counterclockwise to increase
the amount of water.

4. For cold beverage adjustment remove the 1-1/2” plug on the lower left side of the dispenser and rotate the
needle valve clockwise to decrease or counterclockwise to increase the amount of cold water.

ounce per second. This amount can

10

HOPPER DISPENSE RATE OF PRODUCT

NOTE: 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 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, as follows:

1. Place the rinse/run switch in the center (program) position.

2. Hold the increase/decrease switch in the desired (increase or decrease) position.

3. While holding the increase/decrease switch, press and release the dispense switch for the chamber you wish
to adjust. Each time the dispense switch is pressed, the rinse L.E.D. will flash, and the motor speed for that
hopper will be increased/decreased by approximately 2 1/2%.

4. Return the rinse/run switch to the run position after hopper motor speed adjustments are complete.

5. Once any of the three hopper motors has been programmed to the desired speed, either or both of the other
hopper motors can be set to the same speed as follows:
a. Place the rinse/run switch in the center (program) position.
b. Press and hold the dispense switch that has been programmed for the correct speed.

NOTE: Care must be taken not to exceed 5 seconds, or a hopper throw test will occur.

c. Momentarily press the dispense switch for the hopper motor to be programmed. The rinse L.E.D. will light
for approximately 1 second, indicating that the speeds have been set equal.
d. Release both dispense switches.
e. Repeat step 5. b. through 5. d. for remaining hopper motor if desired.
f. Return the rinse/run switch to the run position after hopper motor speed adjustments are complete.

HOPPER THROW TEST

The hopper throw rate, grams per second (g/s) or ounces per second (oz./s), can be checked by automatically
running the hopper motor for 10 seconds.

1. Remove the steam collector and mixing chamber from under the hopper to be checked.

2. Position a small cup under the hopper outlet.

3. Place the rinse/run switch in the center (program) position.

6

29170 011906

HOPPER THROW TEST(cont.)

4. Press and hold the dispense switch of the appropriate chamber for 5 seconds. The hopper motor will run for

10 seconds at the programmed speed.

5. Remove the cup and weigh the dispensed product. To calculate the throw rate (g/s or oz./s), divide the total

weight of the dispensed product by 10.

6. Replace the mixing chamber and steam collector, and return the rinse/run switch to the run position.

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 tank heater switch in the “OFF” (upper) position.

3. Shut off and disconnect the incoming water supply.

4. Remove the top panel.

5. Gently remove one of the grommets from the tank lid.

6. Insert a tube to the bottom of the tank and syphon ALL of the water out.

NOTE - The dispenser must be refilled using the INITIAL FILL & HEAT steps before reconnecting to the power
source.

TROUBLESHOOTING

A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.

• Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.

• All electronic components have 120 volt ac or 240 volt ac and low voltage dc potential on their terminals.

Shorting of terminals or the application of external voltages may result in board failure.

• Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If an

intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a

terminal or crimp.

• Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are

energized for more than ten minutes without a supply of water.

• The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will help

to avoid twists and kinks in the tubing.

• Make certain that all plumbing connections are sealed and electrical connections tight and isolated.

• This unit is heated at all times. Keep away from combustibles.

WARNING – • Exercise extreme caution when servicing electrical equipment.

• Unplug the dispenser when servicing, except when electrical tests are specified.

• Follow recommended service procedures

• Replace all protective shields or safety notices

7

29170 091598

TROUBLESHOOTING (cont.)

PROBLEM

PROBABLE CAUSE

REMEDY

Product will not dispense

1. No water

2. No power or incorrect voltage to
the dispenser

3. Dispense Switch

Water lines and valves to the dis­penser must be open.

(A1) Check for 120 volts across
the black and white wires on two
wire 120 volt dispenser.
(A2) Check for 120 volts across
the red and white wires and the
black and white wires and 240
volts across the red and black wires
on three wire 120/240 volt dis­penser.
(A3) Check for 240 volts across
the white and black wires on two
wire 240 volt dispenser.

(B) Check circuit breakers or fuses.

Refer to

Service

- Dispense Switch

for testing procedure. See page 22

4. Dispense Solenoid Valve
(Hot or Cold)

5. Solenoid Valve (Inlet)

6. Control Board

7. Overflow Protection Switch

8. Auger Drive

Refer to

Service

- Dispense Sole­noid Valve for testing procedures.
See page 33 or 34

Refer to

Service

- Solenoid Valve
(Inlet) for testing procedures. See
page 35

Refer to

Service

- Control Board
and Probe for testing procedures.
See page 18

Refer to

Service

- Overflow Protec­tion Switch for testing procedures.
See page 31

Refer to

Service

- Auger Drive. See

page 13

8

29170 080900

TROUBLESHOOTING (cont.)
PROBLEM

PROBABLE CAUSE

REMEDY

Product will not dispense (cont.)

Water is not hot

9. Water Strainer

10. Lime build-up
CAUTION - Tank and tank compo­nents should be delimed regularly
depending on local water conditions.
Excessive mineral build-up on stain­less steel surfaces can initiate corro­sive reactions resulting in serious
leaks.

11. Rinse cycle not run for 12 hours.

1. Limit Thermostat
CAUTION - Do not eliminate or by­pass limit thermostat. Use only BOM
replacement part #29329.1000

(A) Direction of flow arrow must be
pointing towards dispenser.

(B) Remove the strainer and check
for obstructions. Clear or replace.

Inspect the tank assembly for exces­sive lime deposits. Delime as re­quired.

Refer to

Operations

- Rinse Timer.

See page 5

Refer to

Service

- Limit Thermostat

for testing procedures. See page 30

Spitting or excessive steaming

2. Control Thermostat

3. Tank Heater

4. Tank Heater Switch

1. Lime build-up
CAUTION - Tank and tank compo­nents should be delimed regularly
depending on local water conditions.
Excessive mineral build-up on stain­less steel surfaces can initiate corro­sive reactions resulting in serious
leaks.

2. Control Thermostat

Refer to

Service

- Control Thermo­stat for testing procedures. See page
20

Refer to

Service

- Tank Heater for

testing procedures. See page 36

Refer to

Service

- Tank Heater Switch

for testing procedures. See page 38

Inspect tank assembly for excessive
lime deposits. Delime as required.

Refer to

Service

- Control Thermo­stat for testing procedures. See page
20

9

29170 080900

TROUBLESHOOTING (cont.)
PROBLEM

PROBABLE CAUSE

REMEDY

Dripping from dispense tip

Water flows into tank continuously

1. Lime build-up
CAUTION - Tank and tank compo­nents should be delimed regularly
depending on local water conditions.
Excessive mineral build-up on stain­less steel surfaces can initiate corro­sive reactions resulting in serious
leaks.

2. Dispense Solenoid Valve
(Hot or Cold)

1. Control Board

2. Solenoid Valve (Inlet)

Inspect the tank assembly for exces­sive lime deposits. Delime as re­quired.

Remove the dispense solenoid valve
and clear any obstructions. Rebuild
or replace the valve if necessary. See
page 33 or 34

Refer to

Service -

Control Board and
Probe for testing procedures. See
page 18

Refer to

Service

- Solenoid Valve
(Inlet) for testing procedures. See
page 35

Product overflows container

3. Overflow Protection Switch

1. Dispense Switch

2. Dispense Solenoid Valve
(Hot or Cold)

Refer to

Service

- Overflow Protec­tion Switch for testing procedures.
See page 31

Refer to

Service -

Dispense Switch

for testing procedures. See page 22

Remove the solenoid valve and clear
any obstructions. Rebuild or replace
the valve if necessary. See page 33
or 34

10

29170 080900

TROUBLESHOOTING (cont.)
PROBLEM

PROBABLE CAUSE

REMEDY

Weak product

1. Water temperature

2. Whipper Motor

3. Frother

Place an empty container beneath
the dispense tip. Initiate a dispense
cycle and check the water tempera­ture immediately below the dispense
tip with a thermometer.
(A) Reading for mechanical thermo­stat models should be 180°F(82°C)
to 200°F (93°C) (see thermostat tem­perature settings decal in

TICES

on page 3.

USER NO-

(B) Reading for electronic thermo­stat should be185°F(85°C) to190°F
(88°C).
Adjust the control thermostat to in­crease or decrease the water tem­perature. Replace if necessary.

Refer to

Service

- Whipper Motor for

testing procedure. See page 25

Refer to

Service

- Frother Compo-

nents. See page 24

4. Dispense Solenoid Valve
(Hot or Cold)

5. Auger Drive

6. Auger Spring

7. Auger Motor

8. Rinse/Run Switch

9. Rinse Timer

Refer to

Service

- Dispense Solenoid
Valve for test procedures. See page
33 or 34

Refer to

Service

- Auger Drive Com-

ponents. See page 13

Refer to

Service

- Auger Drive Com-

ponents. See page 13

Refer to

Service

- Auger Drive Com-

ponents. See page 16

Refer to

Service -

Rinse/Run Switch

for test procedures. See page 32

Refer to

Operations

- Rinse Timer.

See page 5

11

29170 080900

TROUBLESHOOTING (CONT.)

PROBLEM

Dispenser is making unusual
noises

Excess dust

PROBABLE CAUSE

1. Plumbing Lines

2. Water Supply

3. Tank Heater

1. Fan

2.Control Board

REMEDY

Plumbing lines should not be rest­ing on the counter top.

(A) The dispenser must be connected
to a cold water line

(B) Water pressure to the dispenser
must not exceed 90 psi (620 kPa)
Install a regulator if necessary to
lower the working pressure to ap­proximately 50 psi (345 kPa).

Remove and clean lime off the tank
heater. See page 36

Refer to

Service

- Fan for testing

procedures. See page 24

Refer to

Service

- Control Board for

testing procedures. See page 18

Display not lit

1. Lamp

2. Lamp Holder

3. Starter - Lamp

4. Ballast

Refer to

Service

- Lamp, see page 28

for lamp replacement.

Refer to

Service

- Lamp Holder for

testing procedures. See page 28

Refer to

Service

- Starter for testing

procedures. See page 29

Refer to

Service

- Ballast for testing

procedures. See page 17

12

29170 080900

SERVICE

This section provides procedures for testing and
replacing various major components used in this
dispenser should service become necessary. Refer to

Troubleshooting

cause of any problem.
WARNING - Inspection, testing, and repair of electri­cal equipment should be performed only by qualified
service personnel. The dispenser should be un­plugged when servicing, except when electrical tests
are required and the test procedure specifically states
to plug in the dispenser.

COMPONENT ACCESS
WARNING - Disconnect the dispenser from the power

source before the removal of any panel or the replace­ment of any component.

All components are accessible by opening the
door, removal of the door panels, dispenser top cov­ers, hoppers, hopper support plate, splash guard,
splash panel with drip tray, lower front access panel,
side and rear access covers.

for assistance in determining the

AUGER DRIVE COMPONENTS

J1

J2

J4

J3

Contents

Auger Drive Components...................................... 13

Auger Motor ......................................................... 16

Ballast ................................................................... 17

Control Board ....................................................... 18

Control Thermostat...............................................20

Dispense Switch ...................................................22

Fan........................................................................23

Frother ................................................................. 24

Hot/Cold Switch .................................................... 26

Increase/Decrease Switch..................................... 27

Lamp Holder ......................................................... 28

Lamp .................................................................... 28

Lamp Starter and Socket ...................................... 29

Limit Thermostat .................................................. 30

Overflow Protection Switch .................................. 31

Rinse/Run Switch .................................................32

Solenoid (Cold Drink - Optional) ........................... 33

Solenoid (Dispense) ............................................. 34

Solenoid (Inlet) ..................................................... 35

Tank Heater .......................................................... 36

Tank Heater Switch ............................................... 38

Transformer..........................................................39

Whipper Motor ..................................................... 25

Wiring Diagrams.......................................... 40 & 41

FIG. 1 AUGER DRIVE COMPONENTS

P1637.40

13