Bunn Beverage Dispenser Fmd 4 Users Manual Service, Repair, Series Service & Repair

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SERVICE & REPAIR MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: (217) 529-6601 FAX: (217) 529-6644

FMD Series

Including: FMD-1,2,3,4,5

242672 030912

BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY

(Excluding regular maintenance items)

Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:

1) Airpots, thermal carafes, decanters, GPR servers, iced tea/coffee dispensers, MCP/MCA pod brewers thermal servers

and Thermofresh servers (mechanical and digital)- 1 year parts and 1 year labor.

2) All other equipment - 2 years parts and 1 year labor plus added warranties as speciﬁed below:

a) Electronic circuit and/or control boards - parts and labor for 3 years.

b) Compressors on refrigeration equipment - 5 years parts and 1 year labor.

c) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis - parts

and labor for 4 years or 40,000 pounds of coffee, whichever comes ﬁrst.

These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be

commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the

applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured

by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation,

improper maintenance or repair, non periodic cleaning and descaling, equipment failures related to poor water quality,

damage or casualty. In addition, the warranty does not apply to replacement of items subject to normal use including but

not limited to user replaceable parts such as seals and gaskets. This warranty is conditioned on the Buyer 1) giving 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; 2) if requested by BUNN, shipping the defective equipment prepaid to an

authorized BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under

warranty.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR ORAL, EX-

PRESS 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.

If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive op-

tion while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during the

applicable parts and labor warranty periods speciﬁed above) to repair the defective components, provided that this repair

is done by a BUNN Authorized Service Representative; or 2) shall 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, AT BUNN’S SOLE OPTION

AS SPECIFIED HEREIN, TO REPAIR, 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.

392, AutoPOD, AXIOM, BrewLOGIC, BrewMETER, Brew Better Not Bitter, BrewWISE, BrewWIZARD, BUNN Espress, BUNN

Family Gourmet, BUNN Gourmet, BUNN Pour-O-Matic, BUNN, BUNN with the stylized red line, BUNNlink, Bunn-OMatic,

Bunn-O-Matic, BUNNserve, BUNNSERVE with the stylized wrench design, Cool Froth, DBC, Dr. Brew stylized Dr. design,

Dual, Easy Pour, EasyClear, EasyGard, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity, iMIX, Infusion Series, In-

tellisteam, My Café, Phase Brew, PowerLogic, Quality Beverage Equipment Worldwide, Respect Earth, Respect Earth with

the stylized leaf and coffee cherry design, Safety-Fresh, savemycoffee.com, Scale-Pro, Silver Series, Single, Smart Funnel,

Smart Hopper, SmartWAVE, Soft Heat, SplashGard, The Mark of Quality in Beverage Equipment Worldwide, ThermoFresh,

Titan, trifecta, Velocity Brew, A Partner You Can Count On, Air Brew, Air Infusion, Beverage Bar Creator, Beverage Proﬁt

Calculator, Brew better, not bitter., BUNNSource, Coffee At Its Best, Cyclonic Heating System, Daypart, Digital Brewer

Control, Nothing Brews Like a BUNN, Pouring Proﬁts, Signature Series, Tea At Its Best, The Horizontal Red Line, Ultra are

either trademarks or registered trademarks of Bunn-O-Matic Corporation.

USER NOTICES

All notices on this equipment are written for your protection. All notices are to be kept in good condition.

Replace any unreadable or damaged labels.

CONTENTS

Warranty ...................................................................................................................................2

User Notices .............................................................................................................................3

Site Preparation .......................................................................................................................3

Preventive Maintenance

Recommended Cleaning ....................................................................................................4

Preventive Maintenance Schedule .......................................................................................5

Troubleshooting ........................................................................................................................6

Service .................................................................................................................................... 12

Electrical Schematics ..............................................................................................................42

SITE PREPARATION

A minimal clearance is required between the dispenser sides and the wall or another appliances. Leave some

space so the dispenser can be moved for cleaning.

INTRODUCTION

Safety ﬁrst!

To avoid electrical shock, unplug dispenser from power source before servicing inside.

Basic Maintenance

In order to maintain proper machine operation, a Preventative Maintenance schedule must be performed on a

regular basis.

The following procedures pretain to all versions in the FMD family of machines unless otherwise noted.

42672 122209

CLEANING

The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all sur-

faces on Bunn-O-Matic equipment. Do NOT clean this equipment with a water jet device.

1 x 24h

NOTICE

The cleaning instructions noted above are for non-dairy sugar based food products. When dispensing any other food product,

the cleaning cycle for the whipping chamber assembly and ejector elbow must be performed daily.

NOTA:

Las instrucciones de limpieza descritas anteriormente excluyen productos lacteos azucarados. La limpieza de las camaras

de mezcla y de los codos de salida de cada tolva deberá realizarse diariamente.

1 x 7d

a. Wash

b. Rinse

c. Sanitize

d. Dry

a. Lave

b. Enjuague

c. Desinfecte

d. Seque

Replace Light Bulbs

as required.

1. Para limpiar las camaras de mezcla, coloque el interruptor en la

posicón ENJUAGUE/MARCHA (”RINSE/RUN”) y pulse el boton

para espumar y distribuir la bebida (”DISPENSE”).

2. Gire el codo hacia arriba, remueva las tolvas, llene las tolvas con

producto y coloque las tolvas nuevamente en la maquina.

3. Vacie la bandeja de goteo y limpiela con un detergente liquido

suave no abrasivo.

1. Rinse out Whipper Chambers by placing RINSE/RUN

switch in the "RINSE" position and activating DISPENSE

switches.

2. Turn elbow up, remove Hoppers, refill with product and

replace hoppers into dispenser.

3. Empty Drip Tray and wash in a solution of dish detergent.

Cambie los bombillos

quemados cuando

sea necesario.

42672 122209

REQUIRED REGULAR MAINTENANCE:

When performing Daily-Weekly Cleaning procedures, inspect o-rings, seals, and bushings for signs of wear or

damage and replace immediately.

Check and/or replace every 6 months or as required:

32906.0000 Mixing Chamber Kit (Includes items indented below)

25732.0000 Steam Collector

25733.0000 Mixing Chamber

25734.0000 Whipper Chamber

25736.0000 Dispense Tip

24733.0010 O-ring

25902.0000 Frother

26356.0000 Shaft Seal

28866.0000 Receptacle

25903.0000 Elbow

29128.0000 Whipper Motor Seal Kit (Includes items indented below)

24733.0010 O-ring

28867.0000 Slinger

26356.0000 Shaft Seal

Check and/or replace every 3 months or as required:

26356.1000 Whipper Shaft Seal Kit (Contains 6 Seals)

42672 122209

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qualiedserviceperson-

nel.

• Allelectroniccomponentshavehighvoltage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ttings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specied.

  • Followrecommendedserviceprocedures

  • Replaceallprotectiveshieldsorsafetynotices

PROBLEM

Product will not dispense

PROBABLE CAUSE

1. No water

2. No power or incorrect voltage to

the dispenser

3. Dispense Switch

4. Digital Touch Control Switch

5. Dispense Solenoid Valve

6. Solenoid Valve (Inlet)

REMEDY

Water lines and valves to the dis-

penser must be open.

(A) Check for correct voltage to the

dispenser.

(B) Check circuit breakers or fuses.

Refer to Service - Dispense Switch for

testing procedure. See page 28

Refer to Service - Digital Touch

Control Switch for testing procedure.

See page 29

Refer to Service - Dispense Solenoid

Valve for testing procedures. See

page 47

Refer to Service - Solenoid Valve

(Inlet) for testing procedures. See

page 49

42672 122209

TROUBLESHOOTING (cont.)

PROBLEM

Product will not dispense (cont.)

Water is not hot

PROBABLE CAUSE

7. Level Control Board and Probe -

FMD-1

8. Control Board

9. Overﬂow Protection Switch

10. Auger Drive

11. Water Strainer

12. Lime build-up

CAUTION - Tank and tank compo-

nents should be delimed regularly

depending on local water conditions.

Excessive mineral build-up on stain-

less steel surfaces can initiate cor-

rosive reactions resulting in serious

leaks.

13. Transformer

14. Rinse Cycle Not Run

1. Limit Thermostat

CAUTION - Do not eliminate or by-

pass limit thermostat. Use only BOM

replacement part #29329.1000

2. Control Thermostat

3. Tank Heater

REMEDY

Refer to Service - Level Control Board

and Probe for testing procedures.

See page 41

Refer to Service - Control Board and

Probe for testing procedures. See

page 20

Refer to Service - Overﬂow Protec-

tion Switch. See page 44

Refer to Service - Auger Drive. See

page 14

(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 ex-

cessive lime deposits. Delime as

required.

Refer to Service - Transformer for

testing procedures. See page 40

Refer to Cleaning for running a Rinse

Cycle.

Refer to Service - Limit Thermostat

for testing procedures. See page

Refer to Service - Control Thermostat

for testing procedures. See page

Refer to Service - Tank Heater for

testing procedures. See page 50

42672 122209

TROUBLESHOOTING (cont.)

PROBLEM

Water is not hot (Cont.)

Spitting or excessive steaming

Dripping from dispense tip

Water ﬂows into tank continuously

PROBABLE CAUSE

4. Tank Heater Switch

5. Heater Relay

6. Control Board

1. Lime build-up

CAUTION - Tank and tank compo-

nents should be delimed regularly

depending on local water conditions.

Excessive mineral build-up on stain-

less steel surfaces can initiate cor-

rosive reactions resulting in serious

leaks.

2. Control Thermostat

1. Lime build-up

CAUTION - Tank and tank compo-

nents should be delimed regularly

depending on local water conditions.

Excessive mineral build-up on stain-

less steel surfaces can initiate cor-

rosive reactions resulting in serious

leaks.

2. Dispense Solenoid Valve

1. Control Board

2. Solenoid Valve (Inlet)

REMEDY

Refer to Service - Tank Heater Switch

for testing procedures. See page

Refer to Service - Heater Relay for

testing procedures. See page 51

Refer to Service - Control Board for

testing procedures. See page 20

Inspect the tank assembly for ex-

cessive lime deposits. Delime as

required.

Refer to Service - Control Thermo-

stat for testing procedures. See

page 26

Inspect the tank assembly for ex-

cessive lime deposits. Delime as

required.

Remove the dispense solenoid valve

and clear any obstructions. Rebuild

or replace the valve if necessary. See

page 47

Refer to Service - Control Board and

Probe for testing procedures. See

page 20

Refer to Service - Solenoid Valve

(Inlet) for testing procedures. See

page 49

42672 122209

TROUBLESHOOTING (cont.)

PROBLEM

Water ﬂows into tank continuously

(Cont.)

Weak product

PROBABLE CAUSE

3. Overﬂow Protection Switch

4. Digital Touch Control Switch

1. Water Temperature

2. Whipper Motor

3. Frother

4. Dispense Solenoid Valve

5. Auger Drive

6. Auger Spring

7. Auger Motor

8. Rinse/Run Switch

9. Rinse Timer

10. Tank Heater Relay

11. Control Board

REMEDY

Refer to Service - Overﬂow Protec-

tion Switch. See page 44

Refer to Service - Digital Touch Con-

trol Switch for testing procedures.

See page 29

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.(see thermostat

temperature settings decal)

Refer to Service - Whipper Motor for

testing procedure. See page 34

Refer to Service - Frother Compo-

nents. See page 33

Refer to Service - Dispense Solenoid

for test procedures. See page 47

Refer to Service - Auger Drive Com-

ponents. See page 14

Refer to Service - Auger Drive Com-

ponents. See page 14

Refer to Service - Auger Drive Com-

ponents. See page 14

Refer to Service - Rinse/Run Switch

for test procedures. See page 45

Refer to the Installation and Operat-

ing Manual

Refer to Service - Relay. See page

Refer to Service - Control Board. See

page 20

42672 122209

TROUBLESHOOTING (CONT.)

PROBLEM

Product overﬂows container

Dispenser is making unusual

noises

Excess dust

Display not lit

PROBABLE CAUSE

1. Dispense Switch

2. Dispense Solenoid Valve

1. Plumbing Lines

2. Water Supply

3. Tank Heater

1. Fan

2. A) Hopper Drive Board - FMD-1

B) Control board

1. Lamp

2. Lamp Holder

3. Starter - Lamp

4. Ballast

REMEDY

Refer to Service - Dispense Switch for

testing procedures. See page 28

Remove the solenoid valve and clear

any obstructions. Rebuild or replace

the valve if necessary. See page 47

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 ap-

proximately 50 psi (345 kPa).

Remove and clean lime off the tank

heater. See page 50

Refer to Service - Fan for testing

procedures. See page 32

Refer to Service - Hopper Drive

Board for testing procedures. See

page 35

Refer to Service - Control Board for

testing procedures. See page 20

Refer to Service - Lamp, see page

39 for lamp replacement.

Refer to Service - Lamp Holder for

testing procedures. See page 39

Refer to Service - Starter for testing

procedures. See page 40

Refer to Service - Ballast for testing

procedures. See page 19

42672 122209

NOTES

42672 122209

SERVICE

This section provides procedures for testing and replacing various major components used in this dispenser

should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any

problem.

WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualiﬁed service

personnel. The dispenser should be disconnected from the power source when servicing, except when electrical

tests are required and the test procedure speciﬁcally states to connect the dispenser to the power source.

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,

hopper(s), hopper support plate, splash guard, splash panel w/drip tray, lower front access panel and rear ac-

cess cover.

Refer to the contents listing for component location.

INDEX

Access Panels ..................................................................................................................................13

Auger Drive Components .................................................................................................................14

Auxillary Control Board (FMD DBC-3) ..............................................................................................17

Ballast ..............................................................................................................................................19

Control Board (Main) ..................................................................................................................20,23

Control Thermostat ..........................................................................................................................26

Dispense Switches ........................................................................................................................... 28

Digital Touch Control Switch ............................................................................................................ 29

EMI Filter (FMD DBC-3) ...................................................................................................................31

Fan ...................................................................................................................................................32

Frother ............................................................................................................................................33

Hopper Drive Board (FMD-1) ...........................................................................................................35

Hot/Cold Switch (FMD DBC-3) ......................................................................................................... 37

Increase/Decrease Switch ................................................................................................................38

Lamp ................................................................................................................................................39

Lamp Holder ....................................................................................................................................39

Lamp Starter & Socket .....................................................................................................................40

Level Control Board (FMD-1) ...........................................................................................................41

Limit Thermostat ..............................................................................................................................43

Overﬂow Protection Switch ..............................................................................................................44

Rinse/Run Switch ............................................................................................................................45

Solenoid (Cold Drink) .......................................................................................................................46

Solenoid (Dispense) .........................................................................................................................47

Solenoid (Hot Water) .......................................................................................................................48

Solenoid (Inlet) ................................................................................................................................49

Tank Heater ......................................................................................................................................50

Tank Heater Relay (FMD-4,5) ...........................................................................................................51

Tank Heater Switch ..........................................................................................................................52

Transformer .....................................................................................................................................53

Whipper Motor .................................................................................................................................34

42672 122209

SERVICE(CONT.)

ACCESS PANELS

Location:

All access panels are similar through the whole FMD family (FMD-5 shown). Before removing panels, make

sure power is OFF to the machine and water is disconnected accept where indicated in testing procedures. Retain

all screws and other attaching hardware for re-assembly.

FIG. 1 ACCESS PANELS

PLACE

CUP HERE

FMD-5 shown

42672 122209

SERVICE (CONT.)

AUGER DRIVE COMPONENTS (all Models)

FIG. 2 AUGER DRIVE COMPONENTS

Location

The auger components are located inside the bottom

part of the hopper except for the auger drive bracket,

spacer and retaining clip, which are located on the

outside rear of the hopper base. The auger motor is

located on the lower right rear of the motor mounting

panel. Refer to Fig. 3 for disassembly and assembly.

Test Procedures - Auger Motor

1. Disconnect the dispenser from the power source.

2. Disconnect the white/red wire and the white wire

from the hopper drive board (FMD-1) or relative

wires from the control board(all other models).

3. Check the voltage across the white/red wire and

the white wire with a voltmeter. With the rinse/

run switch in the run (lower) position, connect the

dispenser to the power supply. The indication must

be:

a) 120 volts ac for two wire 120 volt models.

b)120 volts ac for three wire120/208 volt or

120/240 volt models.

c) 230 volts ac for two wire 230 volt models.

4. Disconnect the dispenser from the power supply.

P4095

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

5. Check the voltage across the positive (red wire)

terminal and the negative (black wire) terminal on

the auger motor with a voltmeter. With the rinse/

run switch in the run (lower) position press and

hold the dispense switch. Connect the dispenser

to the power supply. After a .6 second delay the

indication must be 4.0 to 24.5 volts dc.

If voltage is present as described, the auger motor drive

is operating properly. If auger does not turn, replace

the auger motor.

If voltage is not present as described, check the auger

hopper drive board.

Removal, Cleaning and Replacement

Hopper & Auger (FMD-1,4)

1. Open the dispenser door and raise the top front

cover.

2. Lift the hopper assy (15) over the pins on hopper

support plate (11) and slide hopper assembly out

the front of the dispenser.

3. Remove hopper lid (1) and empty product.

4. Pull off the ejector elbow (14).

5. Remove retainer clip (10) and washer (9) from the

bottom of the hopper base (8).

6. Remove whipper shaft (3), wiper blade (4) and

wiper drive gear (5) from the hopper base (8).

7. Remove auger wire (13) by pulling it out the front

of the hopper base (8).

8. Remove auger drive bracket (6) by unscrewing left

hand threads from auger drive shaft (12).

9. Slide spacer (7) and auger drive shaft bracket (6)

off of the auger drive shaft (12).

10. Remove auger drive shaft (12) from hopper base

(8).

11. Wash components in a mild solution of dish deter-

gent using a bristle brush when needed.

12. Rinse and dry each item thoroughly.

13. Check for damaged or broken components, replace

any if necessary and reassemble hopper assem-

bly.

14. Install hopper assy (15) in the dispenser by sliding

hopper assy on the hopper support plate (11) until

the slot in the rear of the hopper base (8) seats

against the pins in the hopper support plate (11).

FMD-4 shown

42672 122209

SERVICE (CONT.)

AUGER DRIVE COMPONENTS

FIG. 3 AUGER DRIVE & HOPPER DISASSEMBLY

1. Hopper Lid

2. Hopper

3. Wiper Shaft

4. Wiper Blade

5. Wiper Drive Gear

6. Auger Drive Bracket

7. Spacer

8. Hopper Base

9. Washer

10. Retainer Clip

11. Hopper Support Plate

12. Auger Drive Shaft

13. Auger Wire

14. Ejector Elbow

15. Hopper Assembly

16. Auger Motor Bracket

17. Auger Motor

18. Dust Seal

19. Auger Motor Mounting

panel

16 17 18 19 11 P2633

RED to Control Board

BLK to GRN from

Control Board

P1639

FIG. 4 AUGER MOTOR TERMINALS

Auger Drive Motor (Refer to Fig. 2)

1. Remove hopper assy (15), and set aside for reas-

sembly.

2. Remove the four #8-32 screws securing the hopper

support plate (11), remove plate and set aside for

reassembly.

3. Remove the four #8-32 screws, located inside the

dispenser housing on the lower right front of the

auger motor mounting panel (19), securing auger

motor mounting bracket (16) and auger motor

(17) to the rear of the auger motor mounting panel

(19).

4. Disconnect the wires from the hopper drive

board.

5. Remove auger motor mounting bracket (16), auger

motor (17) and dust seal (18) as an assembly.

6. Remove dust seal (18) from auger motor (17).

7. Disconnect the wires from the auger motor (17).

8. Remove the four #8-32 screws securing the auger

motor (17) to the auger motor mounting bracket

(16).

9. Remove auger motor (17) and discard.

10. Using four #8-32 screws install new auger motor

(17) on mounting bracket (16).

11. Install dust seal (18) on auger motor shaft and align

notch in seal with motor casting.

12. Reconnect the wires to the terminals on the hopper

drive board.

13. Refer to schematic wiring diagrams when recon-

necting the wires.

14. Using four #8-32 locking screws install auger mo-

tor, dust seal and mounting bracket to the rear of

the auger motor mounting panel (19).

15. Install hopper assy (15).

FMD-4 shown

42672 122209

SERVICE (CONT.)

AUGER DRIVE COMPONENTS

FIG. 5 AUGER DRIVE & HOPPER DISASSEMBLY

1. Hopper Lid

2. Mixing Blade

3. Agitator Disk

4. Auger Drive Shaft

Bushing

5. Auger Drive Shaft

6. Locknut

7. Auger Drive Bracket

8. Hopper

9. Auger Wire

10. Ejector Elbow

11. Hopper Assy

12. Auger Motor Mounting

Panel

13. Hopper Support Plate

14. Auger Motor Bracket

15. Auger Motor

16. Dust Seal

P2634

14 15 16 12 13

Removal, Cleaning and Replacement

Hopper & Auger (all other hoppers)

1. Open the dispenser door and raise the top front

cover.

2. Lift the front edge of hopper assy (20) over the

tab on hopper support plate (19) and slide hopper

assembly out the front of the dispenser.

3. Remove hopper lid (1) and empty product.

4. Pull off the ejector elbow (13).

5. Remove agitator disc assy (2) by pulling agitator

support rod (4) towards agitator disc assy and

lifting agitator disc assy from hopper (10).

6. Remove auger (12) by pulling it out the front of

the hopper (10).

7. Remove auger drive shaft (5) by removing the

retaining clip (6) from auger drive shaft.

8. Slide washer (8) and auger drive shaft bracket (7)

off of the auger drive shaft (5).

9. Slide auger drive shaft (5) from auger drive shaft

bushing (3) and remove from hopper (10).

10. Remove locknut (9) from auger drive shaft bushing

(3) and remove auger drive shaft bushing from

hopper (10).

11. Wash components in a mild solution of dish de-

tergent using a bristle brush when needed.

12. Rinse and dry each item thoroughly.

13. Check for damaged or broken components, replace

any if necessary and reassemble hopper assy.

14. Install hopper assy (20) in the dispenser by sliding

hopper assy in the guides on the hopper support

plate (19) until the slot in the bottom rear the hop-

per seats against the pin (18) in the hopper support

plate.

FMD-5 shown

42672 122209

SERVICE (CONT.)

AUXILLARY CONTROL BOARD (FMD DBC-3 only)

FIG. 6 AUXILIARY CONTROL BOARD

P4102.40

Location:

The auxiliary control board is located behind the lower

front access cover, mounted on the rear side of the

component bracket.

Hot Water Dispense

Test Procedure:

1. Disconnect the dispenser from the power source.

2. With a voltmeter, and using the component mount-

ing bracket as a reference (-), back probe check

for voltage at pin 1 (red wire) of J1. Connect the

dispenser to the power source. The indication must

be approximately 37 volts dc.

3. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 5. If

voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

4. Back probe check the voltage across pins 2 (black

wire) and 5 (white wire) of the six pin J2 connector

on the wiring harness with a voltmeter. Connect the

dispenser to the power source. The indication must

be:

a) 120 volts ac for two wire 120 volt models

b) 120 volts ac for three wire 120/208 or 120/240

volt models

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

5. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 6. If

voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

6. Check the voltage across the terminals of the hot

water dispense solenoid with a voltmeter. Connect

the dispenser to the power source. Press the hot

water dispense switch. The indication must be:

a) 120 volts ac for two wire 120 volt models

b) 120 volts ac for three wire 120/208 or 120/240

volt models

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

7. Disconnect the dispenser from the power source.

If voltage is present as described the hot water dispense

circuitry is operating properly. If voltage is not present

as described, replace the auxiliary control board.

Ready Light Circuit

Test Procedure:

1. Disconnect the dispenser from the power source.

2. With a voltmeter, and using the component mount-

ing bracket as a reference (-), back probe check

for voltage at pin 1 (red wire) of J1. Connect the

dispenser to the power source. The indication must

be approximately 37 volts dc.

3. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 4. If

voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

42672 122209

Removal and Replacement:

1. Loosen the two #8-32 screws securing the compo-

nent mounting bracket to the dispenser housing.

2. Slide the component mounting bracket forward until

the screw heads align with the large diameters of

the keyhole openings.

3. Lift the component mounting bracket, and pull it

through the lower access panel opening.

4. Disconnect the two plugs on the main wiring har-

ness from the connectors on the auxiliary control

board.

5. Remove the two #6-32 keps nuts securing the

auxiliary control board to the component mounting

bracket.

6. Remove the auxiliary control board.

7. Remove the two snap-in stand-offs from the auxiliary

control board and install them in the new auxiliary

control board. Discard the old auxiliary control

board.

8. Install the new auxiliary control board using the

two #6-32 keps nuts.

9. Reconnect the two plugs on the main wiring harness

to the connectors on the auxiliary control board.

10. Replace the component mounting bracket and

tighten the two #8-32 screws.

4. On the dispenser whipper panel, ensure that the tank

heater switch is in the “ON” (lower) position.

5. Disconnect the black wire coming from the control

thermostat from the limit thermostat.

6. Remove the control thermostat bulb from the

tank.

7. With a voltmeter, and using pin 5 as a reference,

back probe check for voltage, in turn, at pin 3 and

pin 6 of the six pin J2 connector of the wiring har-

ness. Connect the dispenser to the power source.

The indication must be :

a) 120 volts ac for two wire 120 volt models

b) 120 volts ac for three wire 120/208 or 120/240

volt models

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

8. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 9. If

voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

9. Re-install the control thermostat bulb.

10. Noting the starting position of the control thermostat

knob, adjust the control thermostat knob counter-

clockwise until a click is heard.

11. With a voltmeter, check for voltage between pins 3

and 6 of the six pin J2 connector of the wiring har-

ness. Connect the dispenser to the power source.

The indication must be:

a) 120 volts ac for two wire 120 volt models

b) 208 volts ac for three wire 120/208 or 240 volts

ac for three wire 120/240 volt models

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

12. Disconnect the dispenser from the power source.

Return the control thermostat knob to the starting

position.

If voltage is present as described, replace the auxiliary

control board. If voltage is not present as described,

refer to the wiring diagram and check the dispenser

wiring harness.

FIG. 7 AUXILIARY CONTROL

BOARD TERMINALS

P1996.80

SERVICE (CONT.)

AUXILLARY CONTROL BOARD (CONT.)

42672 122209

SERVICE (cont.)

BALLAST (all Models)

Location

The front door lamp ballasts are located behind

the front access panel and may be on either side of the

component bracket assembly.

Test Procedure

1. Disconnect the dispenser from the power source.

2. Disconnect the two black leads on the ballast from

the main harness.

3. Check for continuity between the two black leads

on the ballast.

If continuity is present as described the ballast is op-

erating properly.

If continuity is not present as described, replace the

ballast.

BLK to BLK

from Main

Wiring Harness

BLK to RED from

Main Harness

P1447

FIG. 9 BALLAST TERMINALS

Removal and Replacement

1. Loosen the three #8-32 screws securing the com-

ponent bracket to the dispenser housing base.

2. Pull component bracket out the front of the dis-

penser far enough so the leads on each ballast can

be disconnected from the main wiring harness and

the door interconnect harness.

3. Remove the two #8-32 screws securing each ballast

to the rear of the component bracket.

4. Remove and discard the ballast.

5. Install new ballast on the rear of the component

bracket and secure each with two #8-32 screws.

6. Refer to schematic wiring diagrams when recon-

necting the wires.

7. Place the component bracket into position and

tighten the two #8-32 screws securing the com-

ponent bracket to the dispenser housing base.

P4095

FIG. 8 BALLASTS

FMD-4 shown

42672 122209

SERVICE (cont.)

CONTROL BOARD (FMD-2,-2FD,DBC-2FD,DBC-3)

FIG. 10 CONTROL BOARD

Location:

The Control Board is located behind the lower front

access cover mounted on the component bracket.

Test Procedure:

Power Supply:

1. Disconnect the dispenser from the power source.

2. With a voltmeter, back probe check the voltage

across pins 1 & 2 of the eight pin J1 connector

on the wiring harness. Connect the dispenser to

the power source. The indication must be 24 volts

ac.

3. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 4.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness back

to the transformer.

4. With a voltmeter, back probe check the voltage

across pins 2 & 4 of the six pin J2 connector on

the wiring harness. Connect the dispenser to the

power source. The indication must be:

a) 120 volts ac for two wire 120 volt models

b) 120 volts ac for three wire 120/208 volt models

or three wire 120/240 volt models

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

5. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 6.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness back

to the power cord.

Liquid Level Control Circuitry

6. Carefully connect a piece of insulated jumper wire

to pin 3 (third from left on top row) of J1 on the

control board. Keep the other end of this wire away

from any metal surfaces of the dispenser.

7. With a voltmeter check the voltage across the

terminals of the inlet solenoid valve. Connect the

dispenser to the power source. After a 10 second

delay, the indication must be :

a) 120 volts ac for two wire 120 volt models.

b) 120 volts ac for three wire 120/208 or 120/240

volt models.

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

8. Touch the free end of the jumper wire to the dis-

penser housing. The indication must be 0.

If voltage is present as described, proceed to step 9.

If the voltage is not present as described, replace the

control circuit board.

NOTE: Verify the ground wire is connected to the board

mounting stud before replacing the control board.

9. Gently pull the liquid level probe out of the tank lid

and inspect for corrosion. Replace it if necessary.

10. Place the probe so that neither end is in contact

with any metal surface of the dispenser.

P4102.40

FMD DBC-3 shown

42672 122209

SERVICE (cont.)

CONTROL BOARD (CONT.)

11. With a voltmeter check the voltage across the

terminals of the inlet solenoid valve. Connect the

dispenser to the power source. After a 10 second

delay, the indication must be :

a) 120 volts ac for two wire 120 volt models.

b) 120 volts ac for three wire 120/208 or 120/240

volt models.

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

12. Move the probe’s ﬂat end to the dispenser housing.

The indication must be 0.

13. Move the probe’s ﬂat end away from the housing.

After a 5 second delay, the indication must, again,

be:

a) 120 volts ac for two wire 120 volt models.

b) 120 volts ac for three wire 120/208 or 120/240

volt models.

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

14. Disconnect the dispenser from the power source.

If the voltage is present as described, re-install the

probe. The liquid level control circuitry is operating

properly.

If the voltage is not present as described, check the

pink probe wire and green tank wire for continuity and

check the overﬂow protection switch.

Hopper Motor Control Circuitry:

1. Disconnect the dispenser from the power source.

2. With the voltmeter, back probe check the voltage

across pins 1 & 2 of the eight pin J1 connector on

the wiring harness. Connect the dispenser to the

power source. The indication must be 24 volts ac

from the transformer.

3. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 4.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

4. Check that the “Rinse/Run” switch is in the “Run”

position.

5. With a voltmeter check the voltage across the red

(+) terminal and the black (-) terminal of the auger

motor. Connect the dispenser to the power source.

Press the appropriate dispense switch. After a

delay of about .6 seconds, the indication must be

between +4.0 and +24.5 volts dc.

If the voltage is present as described, the hopper motor

control circuitry is operating properly.

If the voltage is not present as described, replace the

control circuit board.

Whipper Motor and Dispense Solenoid Circuitry:

1. Disconnect the dispenser from the power source.

2. With a voltmeter, back probe check the voltage

across pins 1 & 2 of the eight pin J1 connector

on the wiring harness. Connect the dispenser to

the power source. The indication must be 24 volts

ac.

3. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 4.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

4. Check that the RINSE/RUN switch is in the “Rinse”

position.

5. With a voltmeter, back probe check the voltage

across pins 2 & 4 of the six pin J2 connector on

the wiring harness. Connect the dispenser to the

power source. The indication must be:

a) 120 volts ac for two wire 120 volt models

b) 120 volts ac for three wire 120/208 or 120/240

volt models

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

6. Disconnect the dispenser from the power source.

7. With a voltmeter check the voltage across the

terminals of the appropriate dispense solenoid.

Connect the dispenser to the power source. Press

the appropriate dispense switch. The indication

must be :

a) 120 volts ac for two wire 120 volt models

b) 120 volts ac for three wire 120/208 or 120/240

volt models

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

42672 122209

FIG. 11 CONTROL BOARD CONNECTORS P1680

SERVICE (cont.)

CONTROL BOARD (cont.)

If the voltage is present as described, the whipper mo-

tor and dispense solenoid control circuitry is operating

properly.

If the voltage is not present as described, replace the

control circuit board.

Removal and Replacement:

1. Disconnect the three plugs on the main wiring har-

ness from the connectors on the control board.

2. Remove the four #6-32 keps nuts securing the

control board to the component bracket.

3. Remove control board and discard.

4. Install new control board on the component bracket

using four #6-32 keps nuts.

5. Reconnect the three plugs on the main harness to

the connectors on the control board.

42672 122209

5. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 6.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

6. Carefully connect a piece of insulated jumper wire

to pin 10 (top right) of J2 on control board #1.

Keep the other end of this wire away from any metal

surfaces of the dispenser.

7. Check the voltage across the terminals of the

inlet solenoid valve with a voltmeter. Connect the

dispenser to the power source. The indication

must again be 120 volts ac for two wire 120 volt

models, three wire 120/208 volt models, three wire

120/240 volt models, or 230 volts ac for two wire

230 volt models after a delay of approximately 10

seconds.

8. Touch the free end of the jumper wire to the dis-

penser housing. The indication must be 0.

9. Move the jumper wire away from the housing. The

indication must again be 120 volts ac for two wire

120 volt models, three wire 120/208 volt models,

three wire 120/240 volt models, or 230 volts ac

for two wire 230 volt models after a delay of ap-

proximately 5 seconds.

10. Disconnect the dispenser from the power source

and remove the jumper wire.

If voltage is present as described, proceed to step

11.

If the voltage is not present as described, replace

control board #1.

11. Gently pull the liquid level probe out of the tank lid

and inspect for corrosion. Replace it if necessary.

12. Place the probe so that neither end is in contact

with any metal surface of the dispenser.

13. Check the voltage across the terminals of the

inlet solenoid valve with a voltmeter. Connect the

dispenser to the power source. The indication

must again be 120 volts ac for two wire 120 volt

models, three wire 120/208 volt models, three wire

120/240 volt models, or 230 volts ac for two wire

230 volt models after a delay of approximately 10

seconds.

SERVICE (cont.)

CONTROL BOARD (FMD-3,-4,-5)

FIG. 12 CONTROL BOARD

Location:

The Control Board(s) are located behind the

lower front access cover mounted on the component

bracket.

Test Procedure:

Liquid Level Control Circuitry(Control Board #1):

1. Disconnect the dispenser from the power source.

2. Back probe check the voltage across pins 5 & 6 of

the six pin J3 connector on the wiring harness with

a voltmeter. Connect the dispenser to the power

source. The indication must be 24 volts ac.

3. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 4.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

4. Back probe check the voltage across pins 1 & 4 of

the four pin J4 connector on the wiring harness with

a voltmeter. Connect the dispenser to the power

source. The indication must be 120 volts ac for

two wire 120 volt models, three wire 120/208 volt

models, three wire 120/240 volt models, or 230

volts ac for two wire 230 volt models.

P4095

FMD-4 shown

42672 122209

SERVICE (cont.)

CONTROL BOARD (CONT.)

14. Move the probe’s ﬂat end to the dispenser housing.

The indication must be 0.

15. Move the probe’s ﬂat end away from the housing.

The indication must again be 120 volts ac for two

wire 120 volt models, three wire 120/208 volt

models, three wire 120/240 volt models, or 230

volts ac for two wire 230 volt models after a delay

of approximately 5 seconds.

16. Disconnect the dispenser from the power source.

If the voltage is present as described, re-install the

probe. The liquid level control circuitry is operating

properly.

If the voltage is not present as described, check the pink

probe wire and green tank wire for continuity.

Hopper Motor Control Circuitry (Stations 1-3, Control

Board #1 & Stations 4-5, Control Board #2):

1. Disconnect the dispenser from the power source.

2. Back probe check the voltage across pins 5 & 6 of

the six pin J3connector on the wiring harness with

a voltmeter. Connect the dispenser to the power

source. The indication must be 24 volts ac.

3. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 4.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

4. Check that the rinse/run switch is in the run posi-

tion.

5. Check the voltage across the red (+) terminal and

the black (-) terminal of the auger motor with a volt-

meter. Connect the dispenser to the power source.

Press and hold the appropriate dispense switch.

After a delay of about .6 seconds, the indication

must be between +4.0 and +24.5 volts dc.

If the voltage is present as described, the hopper motor

control circuitry is operating properly.

If the voltage is not present as described, replace the

control circuit board.

Tank Heater Relay Control Circuitry (Control Board #2)

(120V dispensers only):

1. Disconnect the dispenser from the power source.

2. Back probe check the voltage across pins 5 & 6 of

the six pin J3 connector on the wiring harness with

a voltmeter. Connect the dispenser to the power

source. the indication must be 24 volts ac.

3. disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 4.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

4. Back probe check the voltage across pins 1 & 4 of

the four-pin J4 connector on the wiring harness

with a voltmeter. The indication must be 120 volts

ac.

5. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 6.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

6. Check the voltage across the coil terminals of the

tank heater relay with a voltmeter. Connect the

dispenser to the power source. The indication must

be 0 volts ac.

If voltage is absent as described, proceed to step 7.

If voltage is present, replace the control circuit board

#2.

7. Place containers below any three dispenser noz-

zles.

8. Simultaneously initiate dispenses at each of the

selected dispense stations while monitoring the

voltage across the coil terminals of the tank heater

relay. The indication must be 120V ac.

If voltage is present as described, the control board #2

is functioning correctly.

If voltage is not present as described, replace the control

circuit board #2.

42672 122209

J4 J3

FIG. 13 CONTROL BOARD CONNECTORS

P2637

J1 J2

J4 J3

CONTROL BOARD #1

CONTROL BOARD #2

SERVICE (cont.)

CONTROL BOARD (CONT.)

Removal and Replacement:

1. Disconnect the three plugs on the main wiring har-

ness from the connectors on the control board.

2. Remove the four #6-32 keps nuts securing the

control board to the component bracket.

3. Remove control board and discard.

4. Install new control board on the component bracket

using four #6-32 keps nuts.

5. Reconnect the three plugs on the main harness to

the connectors on the control board.

NOTE: J4 is not connected on Control Board #2 on

120/208 - 240V dispensers.

42672 122209

CONTROL THERMOSTAT (FMD-1,-2,-2FD,-3,-4,-5)

SERVICE (cont.)

FIG. 14 CONTROL THERMOSTAT

Location:

The control thermostat (mechanical or electronic)

is located inside the dispenser on the upper left side

of the housing.

Test Procedure:

Mechanical Thermostat:

1. Disconnect the dispenser from the power source.

2. Disconnect the black wire of the control thermostat

from the black lead from the limit thermostat.

3. Remove bulb from the tank.

4. With a voltmeter, check the voltage across black

wire on the control thermostat and the white or red

wire on the tank heater with the tank heater switch

in the “ON” (lower) position. Connect the dispenser

to the power source. The indication must be:

a) 120 volts ac for two wire 120 volt models.

b) 208 volts ac for three wire 120/208 volt mod-

els.

c) 240 volts ac for two wire 240 volt models and

three wire 120/240 volt models.

d) 230 volts ac for two wire 230 volt models.

5. Disconnect the dispenser from the power source.

If voltage is present as described the control thermostat

is operating properly. Reinstall bulb into the tank.

If voltage is not present as described, replace the

thermostat.

P1445

Electronic Thermostat (Optional):

1. Disconnect the dispenser from the power source.

2. Disconnect the black wire of the control thermostat

from the black wire from the limit thermostat.

3. Remove temperature probe from the tank.

4. With a voltmeter, check the voltage across the black

wire from the control thermostat and the white wire

on the tank heater with the tank heater switch in

the “ON” (lower) position. Connect the dispenser

to the power source. The indication must be120

volts ac for two wire 120 volt models.

If voltage is present as described the control thermostat

is operating properly. Reinstall temperature probe into

the tank.

If voltage is not present as described, replace the control

thermostat.

Removal and Replacement:

1. Disconnect the wires from the thermostat.

2. Remove the thermostat capillary bulb/temperature

probe by ﬁrmly pulling up on the capillary grommet

at the tank lid.

3. Loosen the two #8-32 screws securing the thermo-

stat bracket to the upper left rear of the dispenser

housing.

4. Remove thermostat bracket and thermostat as an

assembly.

5. Install the new thermostat and bracket inside the

dispenser housing on the upper left rear side and

tighten the two #8-32 screws.

6. Slide the grommet to the line 4.5" above the bulb

on the new capillary tube (mechanical thermostat

only).

7. Insert the capillary bulb/temperature probe through

the hole in the tank lid and press the grommet ﬁrmly

and evenly so that the groove in the grommet ﬁts

into the tank lid.

8. Carefully bend the capillary tube so that the tube and

bulb inside the tank are in the vertical position and

away from any electrical connections (mechanical

thermostat only).

9. Refer to Fig. 15 and reconnect the wires.

NOTE - The capillary tube must be clear of any electrical

termination and not kinked.

FMD-3 shown

42672 122209

FIG. 15 THERMOSTAT TERMINALS P1448

BLK from Limit

Thermostat

BLK from Tank

Heater Switch

SERVICE (cont.)

CONTROL THERMOSTAT (cont.)

MECHANICAL THERMOSTAT

TAN to WHI/BRN in

Main Wiring Harness

BLK to Main

Wiring Harness

WHI to Main

Wiring Harness

BLK to Main

Wiring Harness

ELECTRONIC THERMOSTAT

42672 122209

P1449

FIG. 17 DISPENSE SWITCH TERMINALS

DISPENSE SWITCHES (FMD-1,-2,-2FD,-3,-4,-5)

SERVICE (cont.)

If voltage is present as described, proceed to #7.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

7. Check for continuity across the terminals (top right

to top left; bottom right to bottom left) of the dis-

pense switch with the switch in the “ON” position.

Continuity must not present when the switch is in

the “OFF” released position.

If continuity is present as described, reconnect the

connector to the door interconnect wiring harness, the

switch is operating properly.

If continuity is not present as described, replace the

switch.

Removal and Replacement

1. Open the dispenser door.

2. Remove the six #8-32 screws securing the bottom

door cover and remove cover.

3. Disconnect the wires on the dispense switch from

the door interconnect wiring harness.

4. Compress the clips inside the door on the dispense

switch and gently push the switch through the

opening

5. Push the new switch into the opening and spread

the clips to hold the switch in the door.

6. Reconnect the wires to the dispense switch from

the door interconnect wiring harness.

7. Reinstall the door bottom cover using six #8-32

screws.

8. Refer to schematic wiring diagrams when recon-

necting the wires.

FIG.16 DISPENSE SWITCHES

P2636

Location:

The dispense switches are located on the lower

outside of the dispenser door.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Open the dispenser door and remove the bottom

door cover.

3. Disconnect the wires from the door interconnect wir-

ing harness to the dispense switch to be tested.

4. Check for voltage across the black and red/white

wires for the dispense switch to be teseted from

the door interconnect wiring harness. Connect the

dispenser to the power supply. The indication must

be:

a) 120 volts ac for two wire 120 volt models.

b) 120 volts ac for three wire 120/208 volt or 120/240

volt models.

c) 230 volts ac for two wire 230 volt models.

5. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to #6.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

6. With a voltmeter, check the voltage across the

remaining two wires of the dispense switch being

tested from the door interconnect wiring harness.

Connect the dispenser to the power source. The

indication must be +5 volts dc.

FMD-5 shown

42672 122209

SERVICE (cont.)

If voltage is present as described, proceed to step 7.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

7. While pressing the appropriate switch, check for

continuity across the following pins of the digital

touch control switch assembly’s multi-pin connec-

tor:

Note: Pin 1 of the connector is identiﬁed by an arrow

embossed on the connector housing.

FMD DBC-3:

Left Small : pin 1 to pin 2

Left Medium: pin 2 to pin 3

Left Large: pin 1 to pin 3

Stop: pin 1 to pin 4

Center Small: pin 1 to pin 5

Center Medium: pin 5 to pin 6

Center Large: pin 1 to pin 6

Right Small: pin 1 to pin 7

Right Medium: pin 7 to pin 8

Right Large: pin 1 to pin 8

Hot Water: pin 1 to pin 13

FMD DBC-2FD:

Left Small : pin 1 to pin 2

Left Medium: pin 2 to pin 3

Left Large: pin 1 to pin 3

Stop: pin 1 to pin 4

Right Small: pin 1 to pin 5

Right Medium: pin 5 to pin 6

Right Large: pin 1 to pin 6

Hot Water: pin 1 to pin 7

If continuity is present as described, the membrane

switch assembly is operating properly.

If continuity is not present as described, replace the

membrane switch assembly.

P1631

Location:

The digital touch control switch is located on the lower

outside of the dispenser door.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Open dispenser door and remove the bottom door

cover.

3. Disconnect the wires from the door interconnect

wiring harness to the digital touch control switch

assembly.

4. With a voltmeter, and using pin 1 of the multi-pin

connector of the door interconnect wiring harness

as a reference (-), check for voltage at each of the

other pins of the connector. Connect the dispenser

to the power source. The indication must be +5

volts dc.

5. On dispensers with a hot water valve, with a volt-

meter, and using pin 1 of the multi-pin connector

of the door wiring harness as a reference (-), check

for voltage at pin 13 (blue/red wire). Connect the

dispenser to the power source. The indication must

be approximately 37 volts dc.

6. Disconnect the dispenser from the power source.

FIG.18 DIGITAL TOUCH CONTROL SWITCH

DIGITAL TOUCH CONTROL SWITCH (FMD DBC-2,DBC-3)

FMD DBC-3 shown

42672 122209

P1685

FIG. 19 DIGITAL TOUCH CONTROL

SWITCH

TO DOOR INTERCONNECT

HARNESS CONNECTOR

SERVICE (cont.)

DIGITAL TOUCH CONTROL SWITCH (cont.)

Removal and Replacement:

1. Open the dispenser door.

2. Remove the ﬁve #6-32 screws securing the bottom

door cover and remove cover.

3. Disconnect the wires on the dispense switch to be

removed from the door interconnect wiring har-

ness.

4. From inside the door gently push the switch away

from the door and discard.

5. Remove the paper from the adhesive backing on

the switch and feed the ribbon cable on the back

of switch through the slot in the door.

6. Firmly press the new switch into the opening on

the door to hold the switch in the door.

7. Reconnect the wires to the dispense switch from

door interconnect wiring harness.

8. Reinstall the door bottom cover using ﬁve #6-32

screws.

9. Refer to Fig. 19 when reinstalling wires.

Align arrows on

connectors

42672 122209

SERVICE (cont.)

EMI FILTER (230 Volt FMD DBC-3)

FIG. 20 EMI FILTER

Location:

The EMI Filter is located on the rear of the dispenser

base on FMD DBC-3.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Disconnect the two black wires and two white

wires on the EMI Filter from the EMI Filter wiring

harness.

3. Check for resistance between the two black leads

on the EMI Filter.

If resistance is present as described the EMI Filter is

operating properly.

If resistance is not present as described, replace the

EMI Filter.

Removal and Replacement:

1. Disconnect the wires from the EMI Filter.

2. Remove the two #8-32 screws and nuts securing

the EMI Filter.

3. Remove and discard EMI Filter.

4. Install new EMI Filter using two #8-32 screws and

nuts to secure EMI Filter to its former location.

5. Refer to schematic wiring diagrams when recon-

necting the wires.

FIG. 21 EMI FILTER CONNECTORS

118.0 kΩ - 118.5 kΩ

Across either pair

42672 122209

VACUUM FAN (all Models)

FIG. 22 FAN

Location:

The fan is located inside the dispenser housing on

the right rear of the dispenser base plate.

Test Procedures:

1. Disconnect the dispenser from the power source.

2. Disconnect the black and white wires from the fan

terminals.

3. With a voltmeter, check the voltage across the

black and white wires. Connect the dispenser to

the power source. The indication must be:

a) 120 volts ac for two wire 120 volt, three wire

120/208 volt and 120/240 volt models.

b) 240 volts ac for two wire 240 volt models.

c) 230 volts ac for two wire 230 volt models.

If voltage is present as described, replace the fan.

If voltage is not present as described, refer to Wiring

Diagrams and check the dispenser wiring harness.

SERVICE (cont.)

Removal and Replacement:

1. Disconnect the vacuum hose from the fan.

2. Remove the two #8-32 locking screws securing the

fan to the dispenser housing base plate.

3. Disconnect the wires from the fan terminals and

discard the fan

4. Refer to schematic wiring diagrams when recon-

necting the wires.

5. Install new fan using two #8-32 locking screws.

6. Reconnect the vacuum hose to the fan.

BLK from Main

WiringHarness

WHI from Main Wiring Harness

FIG. 23 FAN TERMINALS P1507

P4102.40

FMD DBC-3 shown

42672 122209

P4102.40

SERVICE (cont.)

FROTHER AND WHIPPER MOTOR (all Models except -2FD)

FIG. 24 FROTHER AND WHIPPER MOTOR

Location:

The frothers are located behind the dispenser door,

mounted on the whipper motor shaft inside the whipper

chamber.

The whipper motors are located on the back side

of the whipper motor mounting panel.

Test Procedure:

1. Check that the rinse/run switch is in the rinse (up)

position.

2. Disconnect the dispenser from the power source.

3. Disconnect both wires from the black leads on the

motor to be checked.

4. Press and hold the appropriate dispense switch

and, with a voltmeter, check the voltage across the

disconnected harness. Connect the dispenser to the

power source. The reading must be:

a) 120 volts ac for two wire 120 volt models, three

wire 120/208 volt and 120/240 volt models.

b) 240 volts ac for two wire 240 volt models.

c) 230 volts ac for two wire 230 volt models.

5. Disconnect the dispenser from the power source.

If voltage is present as described, replace the motor.

If voltage is not present as described, refer to the Wiring

Diagrams and check the dispenser wiring harness

9 8 7 6 5 4 3

FIG. 25 MIXING/WHIPPER CHAMBER

COMPONENTS

P1630.35

1. Steam Collector

2. Mixing Chamber

3. Dispense Tip

4. Whipper Chamber

5. O-Ring

6. Frother

7. Nut

8. Receptacle w/Seal

9. Slinger

10. Motor Assy.

11. Fan

12. Vacuum Hose

13. Bafﬂe

11 12 13

1 2

Removal, Cleaning & Replacement (Refer to Fig. 25):

1. Disconnect the dispenser from power.

2. Open the dispenser door and turn elbows up.

3. Remove the steam collectors (1) by pulling forward

and at the same time twisting clockwise.

4. Pull the mixing chamber (2) out of the whipper

chamber (4).

5. Remove dispense tip (3) and twist the whipper

chamber (4) clockwise and pull it off the whipper

chamber receptacle (8).

FMD DBC-3 shown

42672 122209

SERVICE (cont.)

FROTHER AND WHIPPER MOTOR (cont.)

6. Pull the frother (6) off the motor shaft. Notice the

ﬂat side on the shaft and the matching ﬂat inside

the frother. It is important that these two ﬂats are

lined up when reassembling.

7. Slip the o-ring (5) off the whipper chamber recep-

tacle (8).

8. Remove nearest side panel and disconnect whipper

motor wires.

9. Remove the two nuts (7) securing whipper chamber

receptacle (8) and whipper motor (10) to the front

panel.

NOTE: To remove the recptacle only, rotate clockwise

until the receptacle clears the nuts (7) and slides

off of the motor shaft.

10. Slide the receptacle with seal off of the motor

shaft.

11. Slide the slinger (9) off of the motor shaft.

12. Remove motor and discard.

13. Install new motor (10) on rear of front panel and

secure with two nuts (7) and connect black leads

on the motor to the main wiring harness. Refer to

Fig. 27 when reconnecting wires

14. Slide slinger (9) onto the motor shaft ﬂush against

the front panel.

15. Wash remaining components in a mild solution of

dish detergent using a bristle brush.

16. Rinse thoroughly and allow to dry before reinstalling

in the dispenser.

17. Slide whipper chamber receptacle with seal (8) and

o-ring (5) on to the motor shaft.

18 Rotate the receptacle with seal (8) counterclockwise

until it snaps into place on the motor mounting nuts

(7).

19. Push frother (6) onto the motor shaft, making sure

the ﬂat in the frother (6) lines up with the ﬂat on

the motor shaft.

20. Install whipper chamber (4) on the whipper chamber

receptacle (8) by twisting counterclockwise until

the tabs on the whipper chamber (4) lock with the

tabs on the whipper chamber receptacle (8). Be

sure dispense port is pointing down.

21. Install dispense tip (3) into the bottom of the whip-

per chamber (4).

22. Slip the mixing chamber (2) onto the mixing chamber

water inlet tube far enough so the mixing chamber

(2) will seat inside the whipper chamber (4).

23. Install the steam collector (1) onto the mixing cham-

ber (2) by pushing down and toward the dispenser

while twisting until the ﬂange on the steam collector

lines up with the slot in the front panel.

24. Install hopper assembly in the dispenser by slid-

ing hopper assembly on the hopper support panel

until the slot in the bottom rear of the hopper seats

against the shoulder screw in the hopper support

panel.

25. Reinstall side panel.

26. Reconnect to power and test.

FIG. 26 WHIPPER MOTOR TERMINALS P1451.40

BLK to Main Harness

42672 122209

SERVICE (cont.)

HOPPER DRIVE BOARD - FMD-1 ONLY

FIG. 27 HOPPER DRIVE BOARD

Location

The hopper drive board is located inside the dispenser

mounted on the auger motor mounting bracket.

Test Procedures:

1. Disconnect the dispenser from the power source.

2. Disconnect the white/red wire and the white wire

from the hopper speed control board.

3. Check the voltage across the white/red wire and

the white wire with a voltmeter. With the rinse/

run switch in the run (lower) position, connect the

dispenser to the power supply. The indication must

be:

a) 120 volts ac for two wire 120 volt models.

b) 120 volts ac for three wire 120/208 volt or

120/240 volt models.

c) 230 volts ac for two wire 230 volt models.

4. Disconnect the dispenser from the power supply.

P1665

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring harness.

5. Check the voltage across the positive (red wire)

terminal and the negative (black wire) terminal on

the auger motor with a voltmeter. With the rinse/

run switch in the run (lower) position press and

hold the dispense switch. Connect the dispenser

to the power supply. After a .6 second delay the

indication must be 4.0 to 24.5 volts dc.

If voltage is present as described,the auger motor drive

is operating properly. If auger does not turn replace

the auger motor.

If voltage is not present as described, replace the hop-

per drive board.

42672 122209

SERVICE (cont.)

HOPPER DRIVE BOARD - FMD-1 ONLY

J1 Connector for

Three Pin Plug from

Potentiometer

RED from Hopper

Motor

FIG. 28 HOPPER DRIVE BOARD TERMINALS

P1669

BLK from

Hopper Motor

RED/WHI from

Main Harness

WHI from Main

Harness

Removal and Replacement: (Refer to Fig. 27)

1. Remove hopper assy (17), and set aside for reas-

sembly.

2. Remove the four #8-32 screws securing the hopper

support plate (12), remove plate and set aside for

reassembly.

3. Remove the four #8-32 screws, located inside the

dispener housing on the lower right front of the auger

motor mounting panel (21), securing auger motor

mounting bracket (18) and auger motor (19) to the

rear of the auger motor mounting panel (21).

4. Disconnect the wires from the terminals on the

hopper drive board and disconnect the three pin

plug (J1) from the hopper drive board.

5. Remove auger motor mounting bracket (18), auger

motor (19), dust seal (20) and hopper drive board

as an assembly.

6. Remove the two #8-32 screws securing the hopper

drive board to the auger motor mounting bracket.

7. Remove the two spacers from the hopper drive

board and discard board.

8. Install spacers on new hopper drive board.

9. Install new hopper drive board to the auger motor

mounting bracket using two #8-32 screws..

10. Refer to Fig. 22 and reconnect the wires to the

hopper drive board terminals.

11. Connect three pin plug from the potentiometer to

the hopper drive board J1. Refer to Fig. 28.

12. Install auger motor mounting bracket with auger

motor and hopper drive board to the rear of the auger

motor mounting panel using four #8-32 screws.

13. Install hopper support plate using four #8-32

screws.

14. Install hopper assy (17).

42672 122209

FIG. 29 HOT/COLD SWITCH P1684.40

HOT/COLD SWITCH (Optional for FMD DBC-3)

Location:

The hot/cold switch is located on the left side of the

whipper motor mounting panel.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Disconnect the wires from the switch terminals.

3. With the switch in the “Cold” (upper) position check

for continuity between the center terminal and the

bottom terminal. With the switch in the “Hot”

(lower) position check for continuity between the

center terminal and the upper terminal.

If continuity is present as described, the hot/cold switch

is operating properly.

If continuity is not present as described, replace the

switch.

Removal and Replacement:

1. Remove all wires from the switch terminals.

2. Remove the mounting nut on the front of the whip-

per motor mounting panel.

3. Remove the hot/cold switch from the rear of the

front panel and discard.

4. Reconnect the wires to the terminals on the rear of

the new switch.

5. Push new hot/cold switch through the hole on the

left side of the whipper motor mounting panel and

secure with mounting nut.

6. Refer to schematic wiring diagrams when recon-

necting the wires.

FIG. 30 HOT/COLD SWITCH TERMINALS P1208

TAN to Main Harness

RED to Main Harness

WHI/YEL to

Cold Solenoid

SERVICE (cont.)

42672 122209

INCREASE/DECREASE SWITCH (FMD-2,-2FD,-3,-4,-5)

FIG. 31 INCREASE/DECREASE SWITCH

P1666

Location:

The increase/decrease switch is located on the lower

left front of the whipper motor mounting panel.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Disconnect the wires from the switch terminals.

3. Check for continuity between the center terminal and

upper terminal with switch in the decrease position

(lower). Check for continuity between the center

terminal and the lower terminal with the switch in

the increase position (upper).

If continuity is present as described, the switch is

operating properly.

If continuity is not present as described, replace the

switch.

Removal and Replacement:

1. Open the dispenser door.

2. Remove the facenut securing the increase/decrease

switch to the whipper motor mounting panel.

3. Remove switch with wires attached from the back

side of the whipper motor mounting panel.

4. Disconnect the wires from the switch and discard

the switch.

5. Refer to schematic wiring diagrams when recon-

necting the wires.

6. Install new switch with wires attached through the

hole in the whipper mounting panel and secure with

facenut.

FIG. 32 INCREASE/DECREASE SWITCH

TERMINALS

P1208

SERVICE (cont.)

FMD-3 shown

42672 122209

SERVICE (cont.)

PUSH and HOLD BUTTON UNTIL CUP IS 2/3 FULL, THEN RELEASE

LAMP HOLDER (all Models)

FIG. 33 LAMP HOLDERS P1454.70

Location:

The lamp holders are located on the front of the upper

panel behind the display panel.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Remove upper door panel (4) and disconnect the

door wiring harness from the leads on the lamp

holders.

3. Remove lamp from lamp holders.

4. Check for continuity on each lead of the lamp hold-

ers.

If continuity is present as described, lamp holders are

operating properly.

If continuity is not present as described replace the

lamp holder.

1. Door Assy

2. Lamp Holders

3. Lamp

4. Upper Panel

5. Lower Panel

6. Starter W/Socket

Removal and Replacement: (Refer to Fig. 33)

1. Open dispenser door (1).

2. Remove the ﬁve #6-32 screws securing lower door

panel (5) to the door (1) and remove cover.

3. Disconnect the door wiring harness from the door

interconnect wiring harness.

4. Remove ﬁve #6-32 screws securing the upper door

panel (4) to the door (1).

5. Remove the upper door cover (4), lamp (3), lamp

holders (2) and door wiring harness as an assem-

bly.

6. Disconnect the wires from the lamp holder to be

replaced from the door wiring harness.

7. Rotate lamp (3) 90° and remove from lamp holders

(2).

8. Remove the #6-32 screw securing the lamp holder

(2) to be removed, remove lamp holder (2) and

discard.

9. Install new lamp holder (2) and secure with a #6-32

screw.

10. Connect the wires on the new lamp holder to the

door wiring harness, black wire to red wire, and

white wire to blue wire.

11. Install lamp (3) into lamp holders (2) and turn 90°

until the pins snap in place.

12. Install upper door panel (4), lamp (3), lamp holders

(2) and door wiring harness as an assembly using

ﬁve #6-32 screws.

13. Reconnect the plug on the door wiring harness

to the connector on the door interconnect wiring

harness.

14. Install the door lower panel (5) using ﬁve

#6-32 screws.

LAMP REPLACEMENT (Refer to Fig. 33)

1. Remove the outside window and display graphic.

2. Remove the two #4-40 screws securing the inside

window to the door and remove window.

3. Rotate lamp (3) 90° and remove from the lamp

holders (2).

4. Insert new lamp (3) into lamp holders (2) and turn

90° until the pins snap in place.

5. Using two #4-40 screws secure the inside window

to the door.

6. Install outside window and slide display graphic

down between the inside window and the outside

window.

FMD DBC-3 shown

42672 122209

SERVICE (cont.)

LAMP STARTER and SOCKET

Location:

The lamp starter (6) is located inside the door assy (1)

on the top of the door lower panel (5).

Test Procedures:

1. Disconnect the dispenser from the power source.

2. Disconnect the starter leads from the door wiring

harness.

3. Remove lamp starter from starter socket.

4. Check for continuity on each lead of the starter

socket.

If continuity is present as described the starter socket

is operating properly.

If continuity is not present as described replace the

starter socket.

6. Remove starter (6) from starter socket.

7. Check for continuity across the pins on the bottom

of the starter (6).

If continuity is present as described, replace the

starter.

If continuity is not present as described, starter is

operating properly.

Note: If continuity tests are both as described and lamp

does not light, replace the starter.

Removal and Replacement (Refer to Fig. 33):

1. Open dispenser door assy (1)

2. Remove the ﬁve #6-32 screws securing the door

lower panel (5) to the door assy (1).

3. Disconnect the leads on the starter socket from the

door wiring harness.

4. Remove lower door panel (5) and starter w/socket

(6) as assembly.

5. Compress the spring tabs on the socket and remove

socket from the door bottom cover (5).

6. Rotate starter 90° and remove from the starter

socket.

7. Insert new starter (6) into socket and turn 90° until

the pins snap in place.

8. Install new socket by compressing spring tabs on

the socket and pushing the socket up through the

hole in the lower door panel (5) and releasing spring

tabs.

9. Connect the sockets leads to the door wiring har-

ness.

10. Install door lower panel (5) with starter and starter

socket on door assy (1) using ﬁve #6-32 screws.

42672 122209

SERVICE (cont.)

LEVEL CONTROL BOARD AND LEVEL PROBE (FMD-1 only)

FIG. 34 LEVEL CONTROL BOARD AND PROBE

Location:

The level control board is located behind the lower

access panel mounted on the right side of the compo-

nent bracket.

The Level probe is located on the left center of the

tank lid just in front of the overﬂow tube.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Remove the violet wire from terminal 1 & pink wire

from terminal 4 of the circuit board.

3. Check the voltage across terminals 2 & 3 with a

voltmeter. Connect the dispenser to the power

source. The indication must be:

a) 120 volts ac for two wire 120 volt models.

b) 120 volts ac for three wire 120/208 volt or

120/240 volt models.

c) 230 volts ac for two wire 230 volt models.

P1665

4. Disconnect the dispenser from the power

source.

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to the wiring

diagram and check the dispenser wiring haness.

5. Reconnect the violet wire to terminal 1.

6. Carefully connect a piece of insulated jumper wire

to terminal 4. Keep the other end of this wire away

from any metal surface of the dispenser.

7. Check the voltage across terminals 1 & 3 with a

voltmeter. Connect the dispenser to the power

source. The indication must be:

a) 120 volts ac for two wire 120 volt models,

b) 120 volts ac for three wire 120/208 volt or

120/240 volt models,

c) 230 volts ac for two wire 230 volt models, after

a delay of approximately 5 seconds.

8. Touch the free end of jumper wire to the component

bracket. The indication must be 0.

9. Move the jumper wire away from the component

bracket. The indication must again be:

a) 120 volts ac for two wire 120 volt models,

b) 120 volts ac for three wire 120/208 volt or

120/240 volt models,

c) 230 volts ac for two wire 230 volt models, after

a delay of approximately 5 seconds.

10. Disconnect the dispenser from the power source

and remove the jumper wire from terminal 4.

If voltage is present as described, the level control board

is operating properly, proceed to #11.

If voltage is not present as described, replace the level

control board.

11. Reconnect the pink wire to terminal 4.

12. Gently pull the probe out of the tank lid and inspect

for corrosion. Replace it if necessary.

42672 122209

P1671

FIG. 35 LEVEL BOARD TERMINALS

TI VIO to Inlet Solenoid Coil

T2 BLK to Main Harness

T3 WHI to Main Harness

T4 PNK to Probe

13. Place the probe so that neither end is in contact

with any metal surface of the dispenser.

14. Check the voltage across terminals 1 & 3 with a

voltmeter. Connect the dispenser to the power

source. The indication must be:

a) 120 volts ac for two wire 120 volt models,

b) 120 volts ac for three wire 120/208 volt or

120/240 volt models,

c) 230 volts ac for two wire 230 volt models, after

a delay of approximately 5 seconds.

15. Move the probe’s ﬂat end to the tank. The indication

must be 0.

16. Move the probe’s ﬂat end away from the tank. The

indication should again be:

a) 120 volts ac for two wire 120 volt models,

b) 120 volts ac for three wire 120/208 volt or

120/240 volt models,

c) 230 volts ac for two wire 230 volt models, after

a delay of approximately 5 seconds.

If voltage is present as described, reinstall the probe,

the level control board and level probe are operating

properly.

If voltage is not present as described, check the pink

probe wire for continuity.

Removal and Replacement:

1. Remove all wires from the level control board.

2. Remove two #8-32 keps nuts holding level control

board to right side of the component bracket.

3. Remove level control board and spacers.

4. Install the new level control board and spacers to

the right side of the component bracket using two

#8-32 keps nuts.

5. Refer to schematic wiring diagrams when recon-

necting the wires.

SERVICE (cont.)

LEVEL CONTROL BOARD AND LEVEL PROBE (cont.)

42672 122209

FIG. 37 LIMIT THERMOSTAT TERMINALS P1800

LIMIT THERMOSTAT (all Models)

FIG. 36 LIMIT THERMOSTAT

Location:

The limit thermostat is located in the center of the

tank lid.

Test Procedures:

1. Disconnect the dispenser from the power source.

2. Disconnect both black wires from the limit thermo-

stat.

3. Check for continuity across the limit thermostat

terminals.

SERVICE (cont.)

If continuity is present as described, the limit thermostat

is operating properly.

If continuity is not present as described, replace the

limit thermostat.

Removal and Replacement:

1. Remove all wires from the limit thermostat termi-

nals.

2. Carefully slide the limit thermostat out from under

the retaining clip and remove the limit thermo-

stat.

3. Carefully slide the new limit thermostat into the

retaining clip.

4. Refer to schematic wiring diagrams when recon-

necting the wires.

P4102.40

FMD DBC-3 shown

42672 122209

SERVICE (cont.)

OVERFLOW PROTECTION SWITCH (FMD-3,DBC-3-4,-5)

FIG. 39 OVERFLOW PROTECTION

SWITCH LEADS

P1212

FIG. 38 OVERFLOW PROTECTION SWITCH

Location:

The overﬂow protection switch is located inside the

copper overﬂow cup on the left side of the tank.

Test Procedures:

1. Disconnect the dispenser from the power source.

2. Remove the wire nuts connecting the red wires

from the overﬂow protection switch to the black

wire and blue wire from the main harness.

3. Check for continuity across the safety overﬂow

switch red wires only until the plastic ﬂoat is raised

and check that continuity returns when the plastic

ﬂoat is again lowered.

If continuity is present as described, reconnect the

red wires to the black wire and the blue wire from the

main harness.

If continuity is not present as described, replace the

overﬂow protection switch.

Removal and Replacement:

1. Disconnect the red leads from the overﬂow protec-

tion switch from the black wire and the blue wire

from the main harness.

2. Remove the nut beneath the copper overﬂow

cup.

3. Remove the entire switch assembly from the cup.

4. Place the new switch assembly into the cup, wires

ﬁrst. Make sure that a gasket is in place around the

threaded switch stem.

NOTE - The magnets must be at the top of ﬂoat and

there must be NO adjusting washers installed for the

overﬂow protection switch to operate properly.

5. Install the nut beneath the copper overﬂow cup. Be

sure not to overtighten.

6. Refer to schematic wiring diagrams when recon-

necting wires.

P4102.40

FMD DBC-3 shown

42672 122209

RINSE /RUN SWITCH (all Models)

FIG. 40 RINSE/RUN SWITCH

P1684.40

Location:

The rinse/run switch is located on the lower right side

of the whipper motor mounting panel.

Test Procedures:

1. Disconnect the dispenser from the power source.

2. Disconnect the wires from the switch terminals.

3. Models FMD DBC-2FD and DBC-3: With the switch

in the “RUN” (lower) position check for continuity

between the center and the upper terminal. With

the switch in the “RINSE” (upper) position no

continuity should be present between center and

upper terminals.

Models FMD-2,-3,-4,-5: Check for continuity

between the center left terminal and left bottom

terminal, also between the center right terminal

and the right bottom terminal with the switch in the

rinse position (upper). Check for continuity across

the center left terminal and the top left terminal,

also between center right terminal and the top

right terminal with the switch in the run position

(lower). Continuity must not be present when the

switch is in the center position.

If continuity is present as described, the “RINSE/RUN”

switch is operating properly.

If continuity is not present as described, replace the

switch.

Removal and Replacement:

1. Open the dispenser door.

2. Remove the facenut securing the run/rinse switch

to the whipper motor mounting panel.

3. Remove switch with wires attached from the back

side of the whipper motor mounting panel.

4. Disconnect the wires from the switch and discard

the switch.

5. Refer to schematic wiring diagrams when recon-

necting the wires.

6. Install new switch with wires attached through

the hole in the whipper motor mounting panel and

secure with facenut.

FIG. 41 RINSE/RUN SWITCH TERMINALS

P1456

SERVICE (cont.)

FMD DBC-3 shown

P1644

FMD-2,-3,-4,-5

FMD DBC-3,-2FD

42672 122209

FIG. 43 COLD WATER SOLENOID TERMINALS

P1215

SOLENOID VALVE (COLD WATER - OPTIONAL for

FMD-2,-3,-4,-5)

FIG. 42 COLD WATER SOLENOID VALVE

Location:

The cold water solenoid valve is located on the left

side of the dispenser base just behind the component

bracket.

Test Procedures:

1. Disconnect the dispenser from the power source.

2. With the “HOT/COLD” switch in the “COLD” (upper)

position press any left dispense switch on front of

the door.

3. With a voltmeter check the voltage across the white

and white/yellow wires at the solenoid terminals.

Connect the dispenser to the power source. The

indication must be:

a) 120 volts ac for two wire 120 volt models

b) 120 volts ac for three wire 120/208 or 120/240

volt models

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

4. Disconnect the dispenser from the power

source.

If voltage is present as described, proceed to #5

If voltage is not present as described, refer to wiring

diagram and check dispenser wiring harness.

5. Disconnect the white and white/yellow wires from

the solenoid.

6. Check for continuity across the solenoid valve coil

terminals.

If continuity is present as described, reconnect the

white and white/yellow wires to the solenoid.

If continuity is not present as described, replace the

solenoid valve.

7. Check the solenoid valve for coil action. Connect the

dispenser to the power source. With “HOT/COLD”

switch in the “COLD” (upper) position press the left

dispense switch and listen carefully in the vicinity

of the solenoid valve for a “clicking” sound as the

coil magnet attracts.

8. Disconnect the dispenser from the power source.

If the sound is heard as described and water will not

pass through the solenoid valve, there may be a block-

age in the water line before the solenoid valve or, the

solenoid valve may require inspection for wear, and

removal of waterborne particles.

If the sound is not heard as described, replace the

solenoid valve.

Removal and Replacement:

1. Loosen the two screws securing the component

bracket to the dispenser base. Lift the component

bracket off of the base and move to the right.

2. Remove the white and white/yellow wires from the

solenoid valve.

3. Turn off the water supply to the dispenser.

4. Disconnect the water lines to and from the solenoid

valve.

5. Loosen the two #8-32 screws and washers secur-

ing the solenoid mounting bracket to the base.

Remove solenoid bracket and solenoid valve as an

assembly.

6. Remove the two #10-32 screws and lockwash-

ers securing the solenoid valve to the solenoid

bracket.

7. Using two #10-32 screws and lockwashers install

new solenoid valve on solenoid mounting brack-

et.

8. Install the solenoid valve and bracket on the dis-

penser base and tighten the two #8-32 screws.

9. Securely fasten the water lines to and from the

solenoid valve.

10. Refer to schematic wiring diagrams when recon-

necting the wires.

SERVICE (cont.)

P4102.40

FMD DBC-3 shown

42672 122209

FIG. 45 DISPENSE SOLENOID VALVE

TERMINALS

P1645

SERVICE (cont.)

SOLENOID VALVES (DISPENSE) (all Models)

FIG. 44 DISPENSE SOLENOID VALVES

P1637.40

Location:

The dispense solenoids are located on the side of

the tank.

Test Procedures:

1. Disconnect the dispenser from the power source.

2. Disconnect the two wires from the solenoid valve.

With the “RUN/RINSE” switch in the “RINSE” (up-

per) position press the appropriate dispense switch

on front of the door.

3. With a voltmeter, check the voltage across the two

wires. Connect the dispenser to the power source.

The indication must be:

a) 120 volts ac for two wire 120 volt models, three

wire 120/208 volt, and 120/240 volt models.

b) 240 volts ac for two wire 240 volt models.

c) 230 volts ac for two wire 230 volt models.

4. Disconnect the dispenser from the power source,

If voltage is present as described, proceed to #5

If voltage is not present as described, refer to Wiring

Diagrams and check dispenser wiring harness.

5. Check for continuity across the solenoid valve coil

terminals.

If continuity is present as described, reconnect the two

wires to the solenoid.

If continuity is not present as described, replace the

solenoid valve.

6. Check the solenoid valve for coil action. Connect the

dispenser to the power source. With “RUN/RINSE”

switch in the “RINSE” (upper) position press the

appropriate dispense switch and listen carefully in

the vicinity of the solenoid valve for a “clicking”

sound as the coil magnet attracts.

7. Disconnect the dispenser from the power source.

If the sound is heard as described and water will not

pass through the solenoid valve, there may be a block-

age in the tank water outlet before the solenoid valve

or, the solenoid valve may require inspection for wear,

and removal of waterborne particles.

If the sound is not heard as described, replace the

solenoid valve.

Removal and Replacement:

1. Remove the two wires from the solenoid valve.

2. Turn off the water supply to the dispenser.

3. Drain enough water from the tank (approximately

1.0 gallon) so the water level is below the dispense

valve mounting hole.

4. Disconnect the water line from the solenoid

valve.

5. Remove the #10-32 screw securing the solenoid

valve to side of the tank. Remove solenoid valve.

6. Using the #10-32 screw install new solenoid valve

on side of the tank

7. Push the water line onto the tube on bottom of

solenoid valve.

8. Refer to schematic wiring diagrams when recon-

necting the wires.

to Dispense Switch to Control Board

FMD DBC-3 shown

42672 122209

P4102

FIG. 46 HOT WATER DISPENSE

SOLENOID VALVE

Location:

The hot water solenoid valve is located on the left side

of the tank.

Test Procedures:

1. Disconnect the dispenser from the power source.

2. With a voltmeter check the voltage across the white

and blue wires at the solenoid valve. Connect the

dispenser to the power source. The indication must

be:

a) 120 volts ac for two wire 120 volt models

b) 120 volts for three wire 120/208 or 120/240 volt

models

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

3. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the wiring

diagram and check dispenser wiring harness.

4. Disconnect the white and blue wires from the so-

lenoid valve.

5. Check for continuity across the solenoid valve coil

terminals.

If continuity is present as described, reconnect the

white and blue wires to the solenoid.

If continuity is not present as described, replace the

solenoid valve.

6. Check the solenoid valve for coil action. Connect

the dispenser to the power source. Listen carefully

in the vicinity of the solenoid valve for a “clicking”

sound as the coil magnet attracts.

7. Disconnect the dispenser from the power source.

If the sound is heard as described and water will not

pass through the solenoid valve, there may be a block-

age in the water line before the solenoid valve or the

solenoid valve may require inspection for wear, and

removal of waterborne particles.

If the sound is not heard as described, replace the

solenoid valve.

Removal and Replacement:

1. Remove the white and blue wires from the solenoid

valve.

2. Turn off the water supply to the dispenser.

3. Drain enough water from the tank (approximately

2.0 gallons) so the water level is below the dispense

valve mounting hole.

4. Disconnect the water line from the solenoid

valve.

5. Loosen the #10-32 screw securing the solenoid

valve to side of the tank. Twist the solenoid valve

clockwise and remove solenoid valve.

6. Using the #10-32 screw install new solenoid valve

on side of the tank.

7. Push the water line onto the tube on bottom of

solenoid valve.

8. Refer to schematic wiring diagrams when recon-

necting the wires.

P1995.50

FIG. 47 HOT WATER DISPENSE

SOLENOID VALVE WIRING

SERVICE (cont.)

HOT WATER DISPENSE SOLENOID VALVE (FMD-2FD,DBC-2FD,-3,DBC-3)

FMD DBC-3 shown

42672 122209

SERVICE (cont.)

SOLENOID VALVE (INLET) (all Models)

FIG. 48 INLET SOLENOID VALVE

Location:

The inlet solenoid is located inside on the rear of

the dispenser base.

Test Procedures:

1. Disconnect the dispenser from the power

source.

2. Disconnect the two wires from the solenoid

valve.

3. Check for continuity across the solenoid valve coil

terminals.

If continuity is present as described, reconnect the two

wires to the solenoid.

If continuity is not present as described, replace the

solenoid valve.

4. Check the solenoid valve for coil action. Connect

the dispenser to the power source. Listen carefully

in the vicinity of the solenoid valve for a “clicking”

sound as the coil magnet attracts.

5. Disconnect the dispenser from the power source.

If the sound is heard as described and water will not

pass through the solenoid valve, there may be a block-

age in the water line before the solenoid valve or, the

solenoid valve may require inspection for wear, and

removal of waterborne particles.

If the sound is not heard as described, replace the

solenoid valve.

Removal and Replacement:

1. Remove the two wires from the solenoid valve.

2. Turn off the water supply to the dispenser.

3. Disconnect the water lines to and from the solenoid

valve.

4. Remove the two #8-32 screws securing the sole-

noid to the dispenser base. Remove solenoid.

5. Install new solenoid valve on the dispenser base

and secure with the two #8-32 screws.

6. Securely fasten the water lines to and from the

solenoid valve.

7. Refer to Schematic Wiring Diagrams when recon-

necting the wires.

P1217

FIG. 49 INLET SOLENOID VALVE TERMINALS

Late Models

Early Models

120V 1.2 kΩ

230V 3.84 kΩ

120V 622 Ω

230V 1555 Ω

P4102.40

FMD DBC-3 shown

42672 122209

SERVICE (cont.)

TANK HEATER (all Models)

FIG. 50 TANK HEATER P4102.40

Location:

The tank heater is located inside the tank and secured to

the tank lid.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. With a voltmeter check the voltage across the black

and white wires 120 volt or 240 volt models or black

and red wires for 120/208 volt models or 120/240 volt

models. Connect the dispenser to the power source.

The indication must be:

a) 120 volts ac for two wire 120 volt models;

b) 208 volts ac for three wire 120/208 volt models.

c) 240 volts ac for three wire 120/240 volt models and

two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

3. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the dispenser

wiring diagram and check the wiring harness.

4. Disconnect the black wire and the white or red wire

from the tank heater terminals.

5. Check for continuity across the tank heater terminals.

If continuity is present as described, reconnect the wires,

the tank heater is operating properly.

If continuity is not present as described, replace the tank

heater.

NOTE - If the tank heater remains unable to heat, remove

and inspect heater for cracks in the sheath.

Removal and Replacement:

1. Shut off water supply to the dispenser.

2. Disconnect the water supply tube on the tank lid.

3. Disconnect the black wires on the limit thermostat. FIG. 51 TANK HEATER TERMINALS P1218

WHI or RED to Main

Wiring Harness

BLK to Limit

Thermostat

FMD DBC-3 shown

4. Disconnect the black wire and the white or red wire from

the tank heater terminals.

5. Disconnect the pink wire from the liquid level probe.

6. Disconnect the green wire from the tank.

7. Remove the thermostat capillary bulb/temperature probe

by ﬁrmly pulling up on the capillary at the tank lid. This

will disengage the grommet from the tank lid.

8. Remove the ten #8-32 nuts securing the tank lid to the

tank.

9. Remove tank lid with limit thermostat, liquid level probe

and tank heater as an assembly.

10. Remove the two hex nuts securing the tank heater to

the tank lid. Remove tank heater with gaskets and dis-

card.

11. Install new tank heater with gaskets on the tank lid and

secure with two hex nuts.

12. Install tank lid with limit thermostat, liquid level probe

and tank heater on the tank and secure with ten #8-32

hex nuts.

13. Connect water inlet line to the tank lid.

14. Reconnect the black wires to limit thermostat, the pink

wire to the liquid level probe and the green wire to the

tank. Refer to the limit thermostat and the liquid level

board and probe sections in this manual when recon-

necting wires.

15. Refer to Fig. 51 when reconnecting the wires to the tank

heater.

Resistance Values

120V 7.8 - 9.2 ohms @ 68° - 75°F

240V 15.3 - 17.9 ohms @ 68° - 75°F

42672 122209

TANK HEATER RELAY (FMD-4,-5,120V Dispensers only)

FIG. 52 TANK HEATER RELAY

P4095

Location:

The tank heater relay is located behind the lower

front access cover, mounted on the left rear side of the

component bracket.

Test Procedure:

1. Disconnect the dispenser from the power source.

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

position.

3. With an ohmmeter, check for continuity between

normally closed (NC-5) and common (COM-3)

terminals of the relay. The indication must be less

than 1 ohm.

If continuity is present as described, proceed to step

If continuity is not present as described, replace the

relay.

4. With an ohmmeter, check the resistance across the

coil terminals (1 & 2) of the relay. The indication

must be approximately 4,000 ohms (4kΩ).

If the resistance measures as described, proceed to

step 5.

If the resistance does not measure as described, replace

the relay.

5. Disconnect the wires from the normally closed (NC-

5) and common (COM-3) terminals of the relay.

FIG. 53 TANK HEATER RELAY TERMINALS

P2639

SERVICE (cont.)

Removal and Replacement:

1. Loosen the three #8-32 screws securing the com-

ponent bracket to the dispenser housing base.

2. Pull component bracket out the front of the dis-

penser far enough so the tank heater relay can be

disconnected from the main wiring harness.

3 Disconnect the tank heater relay from the main

wiring harness.

4. Remove the two #8-32 screws securing the tank

heater relay to the rear of the component bracket.

5. Remove and discard the tank heater relay.

6. Install new tank heater relay on the rear of the

component bracket and secure with two #8-32

screws.

7. Connect the tank heater relay to the main wiring

harness (see Fig. 53).

8. Place the component bracket into position and

tighten the three #8-32 screws.

6. With an ohmmeter, check for continuity between

the normally closed (NC-5) and common (COM-3)

terminals of the relay.

7. Place containers below any three dispense noz-

zles.

8. Connect the dispenser to the power source.

9. Simultaneously initiate dispenses at each of the

selected dispense stations while monitorintg con-

tinuity across the referenced terminals of the tank

heater relay. The indication must be open circuit.

If continuity is absent as described, the relay is func-

tioning correctly.

If continuity is present, replace the relay.

BLK from

Main Harness

BLK from

Main Harness

BRN/BLK from

Main Harness

WHI from

Main Harness

No Connection

42672 122209

P1684.40

SERVICE (cont.)

TANK HEATER SWITCH (all Models)

FIG. 54 TANK HEATER SWITCH

Location:

The tank heater switch located is inside the dispenser

on the upper right of the whipper motor mounting

panel.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Disconnect the black or white/brown wires from

the main harness.

3. With the switch in the “ON” (lower) position check

for continuity between the center and the upper

terminal. With the switch in the “OFF” (upper)

position no continuity should be present between

center and upper terminals.

If continuity is present as described, the heater “ON/

OFF” switch is operating properly.

If continuity is not present as described, replace the

switch.

FIG. 55 TANK HEATER SWITCH TERMINALS

P1219

Removal and Replacement:

1. Refer to the hopper section in this manual and

remove the hopper assemblies and the hopper

support plate.

2. Remove the switch mounting nut on the front of

the front panel.

3. Remove switch with wires attached from the rear

of the front panel.

4. Remove the wires from the switch terminals and

discard switch.

5. Refer to schematic wiring diagrams when recon-

necting the wires.

5. Push new switch through hole in the front panel

and secure with face nut.

7. Refer to the hopper section in this manual and

install the hopper support plate and the hopper

assemblies.

FMD DBC-3 shown

42672 122209

SERVICE (cont.)

FIG. 57 TRANSFORMER TERMINALS

P1647

TRANSFORMER (all Models)

FIG. 56 TRANSFORMER P1646

Location:

The transformer is located behind the lower

front access cover, mounted on the right rear side of

the component bracket.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Disconnect the four pin plug from the main harness

from the four pin connector on the transformer.

3 Check the voltage across black wire (pin 1) and

the

white wire (pin 2) on the plug from the main har-

ness. Connect the dispenser to power source. The

indication must be:

a) 120 volts ac for two wire 120 volt models.

b) 120 volts for three wire 120/208 and 120/240

volt models.

c) 240 volts ac for two wire 240 volt models.

d) 230 volts ac for two wire 230 volt models.

4. Disconnect the dispenser from the power source.

If voltage is present as described reconnect the plug

and the connector and proceed to #5.

If voltage is not present as described, refer to the wiring

diagrams and check the main wiring harness.

5. Check the voltage between J1-1 and J1-2 on the

eight pin connector at the control board. Connect

the dispenser to the power source. The indication

must be 24 volts ac.

If voltage is present as described the transformer is

operating properly.

If voltage is not present as described, replace the

transformer.

Removal and Replacement:

1. Loosen the two #8-32 screws securing the com-

ponent bracket to the dispenser housing base.

2. Pull component bracket out the front of the dispenser

far enough so the transformer connector can be

disconnected from the main wiring harness.

3 Disconnect the transformer four pin connector from

the four pin plug on the main wiring harness.

4. Remove the two #6-32 keps nuts securing the trans-

former to the rear of the component bracket.

5. Remove and discard the transformer.

6. Install new transformer on the rear of the component

bracket and secure with two #6-32 keps nuts.

7. Connect the four pin connector on the transformer

to four pin plug on the main wiring harness.

8. Place the component bracket into position and

tighten the two #8-32 screws.

FMD DBC-3 shown

42672 122209

MOV1

MOV2

MOV4

MOV3

Bunn Part Number 28826.0006

Bunn Part Number 38739.0000

Bunn Part Number 38739.0001

MOV1

TRIAC MAPS for FMD

Q1 & MOV1 controls Reﬁll Valve @ J4

Q1 & MOV1 controls Left Whipper Motor @ J2-6

Q2 & MOV3 controls Center Whipper Motor @ J2-3

Q5 & MOV4 controls Right Whipper Motor @ J2-1

Q7 & MOV2 controls Reﬁll Valve @ J2-5

42672 122209

SOL

DISPENSE

WHIPPER

HOPPER

RUN/RINSE

SWITCH

WHI RED

WHI

RED

BLK-16

120 VOLTS A C - 2 WIRE

120/208-240 VOLTS AC - 3WIRE

SINGLE PHASE

SCHEMATIC WIRING DIAGRAM FMD-1

GRN

L1 NL2

LIMIT

THERMOSTAT

BLK-16 TANK HEATER RED-16 (3-WIRE MODELS)

WHI-16 (2-WIRE MODELS)

BLK-16

SOL

TANK INLET

BLK

PROBE

LIQUID

LEVEL

BOARD

VIOWHI

WHI

PNK

FAN

HEATER

SWITCH

CONTROL

THERMOSTAT

BLK-16

HOPPER

DRIVE

PCB

WHI

BLK

WHI

RED

BLU

STARTER

BLK

BLU

BLUBLU

BLU

RED

RED BLK

BLK

WHI

WHIWHI

WHI

DISPENSE SWITCH

BLK

1 2 3

WHI/RED

FLUORESCENT

LAMP

BALLAST

BLK

BLK BLK

BLK

RED

CHASSIS

DOOR

GRN

HOPPER SPEED ADJUST

42672 122209

SOL

DISPENSE

WHIPPER

HOPPER

RUN/RINSE

SWITCH

WHI RED

WHI

RED

BLK-16

230 VOLTS AC CE

2 WIRE + GND

SINGLE PHASE 50/60 HZ

SCHEMATIC WIRING DIAGRAM FMD-1A

GRN

L1 L2

LIMIT

THERMOSTAT

BLK-16

SOL

TANK INLET

BLK

PROBE

LIQUID

LEVEL

BOARD

VIO WHI

WHI

PNK

FAN

HEATER

SWITCH

CONTROL

THERMOSTAT

BLK-16

HOPPER

DRIVE

PCB

WHI

BLK

WHI

RED

BLU

STARTER

BLK

BLU

BLU BLU

BLU

RED

RED BLK

BLK

WHI

WHI WHI

WHI

DISPENSE SWITCH

BLK

1 2 3

WHI/RED

FLUORESCENT

LAMP

BALLAST

BLK

BLK BLK

BLK

RED

CHASSIS

DOOR

GRN

HOPPER SPEED ADJUST

BLK-16 TANK HEATER WHI-16

THERMAL

FUSE

THERMAL

FUSE

42672 122209

GRN

WHIWHI

WHI WHI

WHI

SOL

LEFT DISPENSE

LEFT WHIPPER

LEFT HOPPER

RIGHT HOPPER

RIGHT WHIPPER

SOL

RIGHT DISPENSE

BLK

WHI

RED

RED BLU

BLU

RED

JUMPER PLUG MUST BE

USED WHEN COLD

DRINK FEATURE NOT

INSTALLED

RED

SOL

COLD DRINK OPTION (LEFT ONLY)

BLK-16

120 VOLTS AC - 2 WIRE

120/208-240 VOLTS AC - 3 WIRE

SINGLE PHASE, 60 HZ

SCHEMATIC WIRING DIAGRAM FMD-2

GRN

L1 NL2

LIMIT

THERMOSTAT

BLK-16 BLK-16

TANK HEATER

RED-16 (3-WIRE MODELS)

WHI-16 (2-WIRE MODELS)

BLK-16

SOL

TANK INLET

BLK

BLKBLK

BLK

WHI

FAN

TANK HEATER

SWITCH

BLK-16

RED

WHI

144

CONTROL

THERMOSTAT

WHI

J4-1

J2-10

J4-4

J3-1

J3-6

J2-1

J2-5

GRN

PROBE

PNK

VIO

GRN

GRN GRN

GRN

WHI/ORN

WHI/RED

WHI/BLK

WHI/GRN

BRN/BLK

RED/BLK

GRY

YEL

WHI/YEL

WHI/RED

WHI/ORN

ORNORN

ORN

TAN

WHI

FLUORESCENT

LAMP

BALLAST

BLK

BLU

GRN/BLK

WHI/BLK

GRY

PNK

"RINSE" L.E.D.

120V : 24V AC

TRANSFORMER

WHI/BLK

WHI/GRN

WHI/GRNWHI/GRN

WHI

BLK

INCREASE/

DECREASE

SWITCH

RINSE/PROGRAM/

RUN SWITCH

RUN

PGM

RINSE

GRY

YEL

BRN/WHI

ORN

WHI/YEL

WHI/ORN

WHI/RED

WHI

BLK

WHI

RED

BLU

STARTER

BLK

BLK BLK

BLK

BLU

BLU BLU

RED

WHI

BLK/WHI

RED/WHI

RED

BLU/WHI

ORN ORN

ORN

LEFT DISPENSE SWITCH RIGHT DISPENSE SWITCH

CHASSIS

DOOR

42672 122209

GRN

WHIWHI

WHI WHI

WHI

SOL

LEFT DISPENSE

LEFT WHIPPER

LEFT HOPPER

RIGHT HOPPER

RIGHT WHIPPER

SOL

RIGHT DISPENSE

BLK

WHI

RED

RED BLU

BLU

RED

RED JUMPER PLUG MUST BE

USED WHEN COLD

DRINK FEATURE NOT

INSTALLED

RED

SOL

COLD DRINK OPTION (LEFT ONLY)

BLK-16

230 VOLTS AC

2 WIRE + GND

SINGLE PHASE, 50 HZ

SCHEMATIC WIRING DIAGRAM FMD-2A

GRN

L1 L2

LIMIT

THERMOSTAT

BLK-16BLK-16 TANK HEATER WHI-16

BLK-16

SOL

TANK INLET

BLK

BLKBLK

BLK

WHI

FAN

TANK HEATER

SWITCH

BLK-16

RED

WHI

144

CONTROL

THERMOSTAT

WHI

J4-1

J2-10

J4-4

J3-1

J3-6

J2-1

J2-5

GRN

PROBE

PNK

VIO

GRN

GRN GRN

GRN

WHI/ORN

WHI/RED

WHI/BLK

WHI/GRN

BRN/BLK

RED/BLK

GRY

YEL

WHI/YEL

WHI/RED

WHI/ORN

ORNORN

ORN

TAN

WHI

FLUORESCENT

LAMP

BALLAST

BLK

BLU

GRN/BLK

WHI/BLK

GRY

PNK

"RINSE" L.E.D.

240V : 24V AC

TRANSFORMER

WHI/BLK

WHI/GRN

WHI/GRNWHI/GRN

WHI

BLK

INCREASE/

DECREASE

SWITCH

RINSE/PROGRAM/

RUN SWITCH

RUN

PGM

RINSE

GRY

YEL

WHI/BRN

ORN

WHI/YEL

WHI/ORN

WHI/RED

WHI

BLK

WHI

RED

BLU

STARTER

BLK

BLK BLK

BLK

BLU

BLUBLU

RED

WHI

BLK/WHI

RED/WHI

RED

BLU/WHI

ORN ORN

ORN

LEFT DISPENSE SWITCH RIGHT DISPENSE SWITCH

CHASSIS

DOOR

THERMAL

FUSE

THERMAL

FUSE

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SCHEMATIC WIRING DIAGRAM FMD DBC-2

FREEZE DRIED W/HOT WATER

HOT WATER

WHI

WHI/VIO

RED

ORN

RIGHT DISPENSE

LEFT DISPENSE

SOL

HOT

WATER

MSTOP

LEFT CENTER

SWITCH UNIT ASSY

WHI

BLK

RED

BLU

WHI

BLU

WHI

BLU

STARTER

BLKBLK BLK

FLUORESCENT

LAMP

BALLAST

GRN

RED/BLK

BRN/BLK

DOOR

CHASSIS

111

444

WHI/RED

WHI/ORN

WHI/BLU

GRY

RED

ORN

GRN/BLK

RED/WHI

GRN

RIGHT HOPPER

LEFT HOPPER

42672 122209

GRN

WHI

SOL

LEFT DISPENSE

HOT WATR

LEFT HOPPER

RIGHT HOPPER

SOL

RIGHT DISPENSE

BLK

WHI

RED

BLK-16

120 VOLTS AC - 2 WIRE

120/208-240 VOLTS AC - 3 WIRE

SINGLE PHASE, 60 HZ

SCHEMATIC WIRING DIAGRAM FMD-2FD

GRN

L1 NL2

LIMIT

THERMOSTAT

BLK-16 TANK HEATER RED-16 (3-WIRE MODELS)

WHI-16 (2-WIRE MODELS)

BLK-16

SOL

TANK INLET

BLK

BLKBLK

BLK

WHI

FAN

TANK HEATER

SWITCH

BLK-16

RED

144

CONTROL

THERMOSTAT

WHI

J4-1

J2-10

J4-4

J3-1

J3-6

J2-1

J2-5

GRN

PROBE

PNK

VIO VIO

GRN

GRN GRN

GRN

WHI/GRY

WHI/ORN

WHI/RED

WHI/BLK

WHI/GRN

BRN/BLK

RED/BLK

GRY

YEL

WHI/YEL

WHI/RED

WHI/ORN

ORN

FLUORESCENT

LAMP

BALLAST

BLK

BLU

GRN/BLK

WHI/BLK

GRY

PNK

"RINSE" L.E.D.

120V : 24V AC

TRANSFORMER

WHI/BLK

WHI/GRNWHI/GRN

INCREASE/

DECREASE

SWITCH

RINSE/RUN

SWITCH

RUN

RINSE

GRY

YEL

BRN/WHI

WHI/VIO

ORN

WHI/YEL

WHI/ORN

WHI/RED

WHI

BLK

WHI

RED

BLU

STARTER

BLK

BLK BLK

BLK

BLU

BLU BLU

RED

WHI

BLK/WHI

RED/WHI

RED

BLU/WHI

ORN ORN

ORN/BLK

ORN

BLK

LEFT DISPENSE SWITCH RIGHT DISPENSE SWITCH

HOT WATER

DISPENSE SWITCH

CHASSIS

DOOR

GRN

WHI/VIO

ORN/BLK

GRN

DISPENSE/PROGRAM

SWITCH

DISP

PGM

White Strip-Tac Plus

Black Ink

Finished Size: 6.25" x 7.20"

62% Reduction

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61 42672 122209

62 42672 122209

63 42672 122209

64 42672 122209

RED

(3-WIRE MODELS)

BLK

(3-WIRE MODELS)

BLK

(2-WIRE MODELS)

WHI

(2-WIRE MODELS)

GREEN

L1 L2

BLK

MAIN ON/OFF SWITCH

(Late 3-wire Models only)

RED

WHI

SCHEMATIC WIRING DIAGRAM FMD DBC-3

(WITH HOT WATER DISPENSE)

120 VOLTS AC 2 WIRE + GND or

120/208-240 VOLTS AC - 3 WIRE + GND

SINGLE PHASE, 60 Hz

42672 122209

L2L1

230 VOLTS AC - 2 WIRE

SINGLE PHASE

50/60 HZ

BLU/RED

WHI/RED

BLK/WHI

ORN/BLK

RED/BLK

BLU/BLK

BLU/WHI

ORN

WHI/BLK

BLK

RED

RED/WHI

GRN/BLK

ORN

RED

RUN

RINSE

GRY

WHI/BLU

WHI/ORN

WHI/RED

GRN

WHI/BRN

BRN/BLK

RED/BLK

WHI/VIO-22

WHI/VIO

BLU-22

BLU

BLK

BLU/BLK

WHI

WHI/VIO-22

RED-22

J2-1

J2-5

J1-1

GRN-22

RED-22

RED/BLK

BRN/BLK

WHI/BRN

WHI/VIO

WHI/VIO WHI/VIO

WHI/BLU

ORN

ORN ORN

GRN GRN

BLU

GRY

RED

BLK

BLU/BLK BLU/BLK

BLK-16 BLK-16 BLK-16 BLK-16

WHI

WHI/GRN

WHI/BLK

BLK

WHI

WHI/GRN

WHI/BLK

WHI/VIO

WHI/RED

GRN

WHI/BLU

WHI/ORN

GRN GRN BLU

N.C.

SOL

REDRED VIO

BLK

WHI

GRN/YEL

PNK

WHI/BLK

WHI/GRN

ORN

WHI

BLU

RED

WHI/RED

WHI/ORN

GRN

STARTER

DOOR

CHASSIS

COLD DRINK OPTION (LEFT ONLY)

SOL

LEFT CENTER RIGHTREADY

HOT

WATER

STOP

AUX. CONTROL PC BOARD

SWITCH UNIT ASSY

RIGHT DISPENSE

120V : 24V AC

TRANSFORMER

PROBE

CONTROL

THERMOSTAT

LIMIT

THERMOSTATTANK HEATER

OVERFLOW SWITCH

FAN

TANK INLET

TANK HEATER

SWITCH

LEFT DISPENSE

CENTER DISPENSE

RIGHT WHIPPER

LEFT WHIPPER

CENTER WHIPPER

RIGHT HOPPER

HOT WATER

LEFT HOPPER

CENTER HOPPER

SOL

HOT/COLD SWITCH

JUMPER PLUG MUST BE

USED WHEN COLD

DRINK FEATURE NOT

INSTALLED

BLU

WHI

BLUBLK BLK

WHI

BLU

BLK

WHI

J3-1

J2-1

J1-1

J2-5

J1-5

J1-8

J3-5

J3-10

J4-4

J4-1

TAN

RED

WHI

WHI WHI

WHI/RED

WHI/ORN

WHI/BLU

RED

BLK

GRN

WHI

WHI/YEL

TANTAN

RED RED

RED

WHI

BLK

BLK RED

RED

WHI

FLOURESCENT

LAMP

BALLAST

DISCONNECT

TO ENABLE

RINSE TIMER

SCHEMATIC WIRING DIAGRAM FMDA DBC-3

(WITH HOT WATER DISPENSE)

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67 42672 122209

68 42672 122209

69 42672 122209

70 42672 122209

GRN

GRY

WHI/GRY

BRN/BLK

BLK

INCREASE/

DECREASE

SWITCH

RINSE/PROGRAM/

RUN SWITCH

RUN

PGM

RINSE

WHI/VIO

RED/BLK

GRN

GRY

PNK

WHI/ORN

WHI/RED

WHI/GRY

WHI/VIO

GRY

WHI/GRY

WHI/VIO

WHI

VIO

WHI

WHI/BLK

WHI/GRN

WHI/BLK

WHI/RED

WHI/GRN

WHI/BLK

BRN/WHI

RED/BLK

BLU/BLK

WHI/YEL

TAN

J2-5

J3-5

J3-1

J4-4

J4-1

J1-4

J1-1

J2-1

J2-10

WHI/ORN

WHI/BLU

GRN

BLK

RED

SCHEMATIC WIRING DIAGRAM FMD-5A

GRN

BLK-16

BLK

BLK-16 BLK-16 BLK-16

BLK WHI

WHI

TANK HEATER

SWITCH

CONTROL

THERMOSTAT

LIMIT

THERMOSTAT

FAN

SOL

REFILL VALVE

VIO

OVERFLOW PROTECTION SWITCH

RED RED WHI/VIO

GRY

PNK

"RINSE" #1-3 L.E.D.

116

1614

RED/WHI

BLU/WHI

TAN

GRN

GRY

PNK

"RINSE" #4 & 5 L.E.D.

RED/GRN

ORN/RED

BLU/BLK

GRN

WHI/RED

WHI/BLK

WHI/RED WHI/RED WHI/RED

GRN/BLK

GRN/WHI

BLU/BLK

BLU

BLK/WHI

RED/BLK

RED

ORN/BLK

ORN

BLK BLK BLK BLK

WHI/RED

BLK

WHI/BLK

BLU/BLK

RED/BLK

ORN/BLK

RED

ORN

GRN/WHI

GRN/BLK

BLU

BLK

WHI/RED

WHI/BLK

BLK/WHI

RED

ORN

YEL

BLU

BRN/BLK

BRN

WHI/RED

WHI/ORN

WHI/YEL

WHI/BLU

GRN

WHI

BLK

WHI

BLU

WHI

BLK

BLK/RED

WHI

BLU/RED

BLK/RED

RED

BLU

RED

BLU

WHIWHI

GRN

BLU/RED

BLK

WHI

BLK

STARTER

LAMP #1

BALLAST LAMP #2

BALLAST

BLK BLK

BLK BLK BLK BLK BLK

BLK

BRN/BLK

HOPPER #4 HOPPER #5

SOL

STATION #1

WHIPPER

STATION #2

WHIPPER

STATION #3

WHIPPER

STATION #4

WHIPPER

STATION #5

WHIPPER

STATION #1

DISPENSE

VALVE

STATION #2

DISPENSE

VALVE

STATION #3

DISPENSE

VALVE

STATION #4

DISPENSE

VALVE

STATION #5

DISPENSE

VALVE

BLK BLK BLK BLK BLK BLK BLKBLK BL

BRN

TAN

WHI

RED

RED RED

RED

TANHOT SOL

COLD

WHI

WHI/YEL

COLD DRINK OPTION (LEFT ONLY)

HOT/COLD SWITCH

BRN

TANWHI WHI ORN WHI

WHI

ORN

YEL WHIBLU

WHI

BLU

WHI

YEL

RED

ORN

BLU

YEL

RED

JUMPER PLUG MUST BE

USED WHEN COLD

DRINK FEATURE NOT

INSTALLED

RED RED

WHI/YEL WHI/BLU

GRN

BLK

BLK RED

RED

HOPPER #1 HOPPER #2 HOPPER #3

MMM

BRN/WHI WHI/RED WHI/ORN

GRN

BLK

GRN

230 VOLTS AC

2 WIRE + GND

SINGLE PHASE, 50/60HZ

12345

240V : 24V AC

TRANSFORMER

WHI/BLK

WHI/GRN

BLK

WHI

LOAD LINE

KBLK-16 TANK HEATER WHI-16

THERMAL

FUSE

THERMAL

FUSE

PROBE

J2-5

J3-5

J3-1

J4-4

J4-1

J2-1

J2-10

J1-4

J1-1

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Bunn Beverage Dispenser Fmd 4 Users Manual Service, Repair, Series Service & Repair

FMD-4 to the manual 515f927f-d0ac-4f58-8cea-3e44453e0644

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