Bunn FMD 2 User Manual

BUNN

FMD-1

FMD-2

S/N FMD0013000-UP

UP IS 2/3 FULL

HEN

TTON

PLACE

RELEASE BU

PLA

2/3 FU

EN CUP IS

TON

SE BUT

ELEA

PLACE

CUP HER

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

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

USER NOTICES (Cont.)

00656.0000

00831.0000

27096.0000 FMD-1 ONLY

28368.0001

PUSH and HOLD BUTTON UNTIL CUP

IS 2/3 FULL, THEN RELEASE

PUSH and HOLD BUTTON UNTIL CUP

IS 2/3 FULL, THEN RELEASE

28964.0000

28964.0001

29112 101598

INITIAL SET-UP

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

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

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

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

securely install the legs in the dispenser base.

ELECTRICAL REQUIREMENTS

CAUTION - The dispenser must be disconnected from the power source until specified in Initial Set-Up.

The 120 volt version of this dispenser has an attached cordset and requires 2-wire, grounded service rated 120

volts ac, 15 amp, single phase, 60 Hz. The mating connector must be a NEMA 5-15R.

The 120/208 and the 120/240 versions of this dispenser has an attched cordset. The mating connector must be

a NEMA 14-20R.

(Refer to the dispenser’s dataplate for exact voltage requirement.)

ELECTRICAL HOOK-UP

CAUTION – Improper electrical installation will damage electronic components.

1. An electrician must provide electrical service as specified.

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

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

4. Connect the dispenser to the power source.

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

plumbing has been hooked-up, the dispenser is ready for Initial Fill & Heat.

PLUMBING REQUIREMENTS

This dispenser must be connected to a COLD WATER system with operating pressure between 20 and 90 psi

(138 and 620 kPa) from a ⁄2" or larger supply line. A shut-off valve should be installed in the line before the

dispenser. Install a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345

kPa). The water inlet fitting is ¹⁄4" flare.

NOTE - Bunn-O-Matic recommends ¹⁄4" copper tubing for installations of less than 25 feet and ³⁄8" for more than

25 feet from the ¹⁄2" water supply line. At least 18 inches of an FDA approved flexible beverage tubing, such as

reinforced braided polyethylene or silicone, before the brewer will facilitate movement to clean the countertop. It

can be purchased direct from Bunn-O-Matic (part number 00326-0000). Bunn-O-Matic does not recommend

the use of a saddle valve to install the brewer. The size and shape of the hole made in the supply line by this type

of device may restrict water flow

This equipment must be installed to comply with the Basic Plumbing Code of the Building

Officials and Code Administrators International, Inc. (BOCA) and the Food Service Sanita-

tion Manual of the Food and Drug Administration (FDA).

PLUMBING HOOK-UP

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

the dispenser.

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

3. Turn-on the water supply.

29112 051200

INITIAL FILL & HEAT

CAUTION - The dispenser must be disconnected from the power source throughout the initial set-up, except

when specified in the instructions.

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

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

minutes.

3. When the tank is full of water, open the front door and place the heater switch in the “ON” (lower) position.

A tank full of cold water will take approximately forty minutes for the water to heat on 120 volt versions or

twenty minutes for 120/208 volt versions and 120/240 volt versions.

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

a. Place the drip tray in front of the dispenser. Set the drip tray cover in place.

b. Placeasetofkeyholesinthecuplocatorplateoverthescrewsbeneaththehopperaccessdoorandpushdown

gently.

c. Fill the hopper with the dry product to be dispensed.

LIQUID LEVEL CONTROL

The system automatically maintains the hot water tank’s level by energizing the refill solenoid when the water

level drops below the liquid level probe. If the system for the FMD-2 only has not successfully refilled in 7 1/2

minutes, a refill error occurs.

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

5 seconds.

Once the cause of the refill error has been investigated (see the troubleshooting guide in the Operating and

Service Manual) and cured, the system can be reset by disconnecting (for at least 5 seconds) and then

reconnecting the power to the machine.

RINSE TIMER (FMD-2 ONLY)

The dispenser is shipped from the factory with the rinse timer disabled. To enable the rinse timer, remove

power from the dispenser, remove the lower access panel, and remove the jumper from J1 of the control board.

Replace the lower access panel, and return power to the dispenser.

When enabled, the rinse timer automatically keeps track of the time since the dispenser was last run through

a rinse sequence. If the dispenser detects that a rinse sequence has not been run for 8 hours, the rinse L.E.D. will

flash continually. If, after an additional 4 hours (12 hours total), a rinse sequence has still not been run, the rinse

L.E.D. will light continuously, and the hopper drives will be disabled until a rinse sequence has been run.

RUNNING A RINSE SEQUENCE

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

2. Sequentially, or simultaneously, at each of the two positions (FMD-2 only) dispense for at least 10 seconds.

3. After the rinse L.E.D. has extinguished, the rinse timer is reset (FMD-2 only).

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

DISPENSER USE

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

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

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

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

29112 101598

COLD BEVERAGE SET-UP (OPTIONAL FMD-2 ONLY)

Cold beverages may be dispensed from the left dispense position as follows:

1. Disconnect the dispenser from the power source.

2. Remove the lower front access panel.

3. Locate the Hot/Cold jumper connection near the whipper panel in the main wiring harness.

4. Remove the Hot jumper connection (red jumper plug) from the main wiring harness and connect the Cold

jumper connection (blue jumper plug) to the main harness.

5. Replace the lower front access panel and reconnect the dispenser to the power source.

CLEANING

Refer to the decal on the rear of the dispenser door for cleaning recommendations and proccedures.

Theuseofadampclothrinsedinanymild, non-abrasive, liquiddetergentisrecommendedforcleaningallsurfaces

on Bunn-O-Matic equipment.

ADJUSTMENTS

The beverage solenoid is preset to dispense approximately one ounce per second. This amount can be adjusted:

1. Disconnect the dispenser from the power source.

2. Remove product hopper(s).

3. Remove the hole plug(s) in the auger motor mounting panel.

4. Rotatethecontrolatthebaseofthesolenoidclockwisetodecreaseorcounterclockwisetoincreasetheamount

of water.

5. Reinstall plug(s) and hopper(s).

HOPPER MOTOR SPEED ADJUSTMENT (FMD-1)

The hopper dispense rate is preset at the factory. With 8 tooth gear and auger wire the preset dispense rate is

approximately 3 to 5 grams per second. With 12 tooth gear and auger wire the preset dispense rate is approxi-

mately 5 to 7 grams per second. The hopper dispense rate can be adjusted to produce a wide range of dispense

rates as follows:

1. Set the tank heater switch to the off position.

2. Open the top front cover of the dispenser and remove the two screws securing the top cover.

3. Remove the top cover assembly and set it aside.

4. Locate the motor speed adjuster (leftmost) on the dispenser cabinet top cross member.

5. Using extreme care not to touch the live terminals of the tank heater, adjust the motor speed by rotating the

motor speed adjuster to the desired point, ranging from minimum (full counterclockwise) to maximum

(full clockwise.)

6. After the motor adjustment is complete, replace the top cover assembly, securing it with the two screws,

and return the tank heater switch to the on position.

HOPPER MOTOR SPEED PROGRAMING (FMD-2)

The hopper dispense rate is preset at the factory. With 22 tooth gear and auger wire the preset dispense rate is

approximately3to5gramspersecond.With32toothgearandaugerwirethepresetdispenserateisapproximately

5 to 7 grams per second. The hopper dispense rate can be adjusted to produce a wide range of dispense rates as

follows:

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

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

3. Press and release the dispense switch for the chamber you wish to adjust. Each time the dispense switch is

pressed, the rinse L.E.D. will flash, and the motor speed for that hopper will be increased/decreased by

approximately 2 1/2%.

29112 101598

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

DRAINING THE HOT WATER TANK

CAUTION - The dispenser must be disconnected from the power source throughout these steps.

1. Disconnect the dispenser from the power source.

2. Open front door and place tank heater switch in the “OFF” (upper) position.

3. Shut-off and disconnect the incoming water supply.

4. Remove the top panel.

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

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

(Bunn-O-Matic has a syphon assembly #12440.0000 available for this purpose.)

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

source.

29112 101598

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, andrepairofelectricalequipmentshouldbeperformedonlybyqualifiedservicepersonnel.

All electronic components have 120 volt ac and low voltage dc potential on their terminals. Shorting of

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

•

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

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

terminal or crimp.

•

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

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

Theuseoftwowrenchesisrecommendedwheneverplumbingfittingsaretightenedorloosened. Thiswillhelp

to avoid twists and kinks in the tubing.

•

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

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

WARNING – • Exercise extreme caution when servicing electrical equipment.

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

• Follow recommended service procedures

• Replace all protective shields or safety notices

REMEDY

PROBLEM

PROBABLE CAUSE

Water lines and valves to the dis-

penser must be open.

Product will not dispense

1. No water

(A1) Check for 120 volts across the

black and white wires on two wire

120 volt dispensers.

2. No power or incorrect voltage to

the dispenser

(A2) Check for 120 volts across the

red and white wires and the black

and white wires, 208 volts across

the red and black wires on three wire

120/208 volt dispensers and 240

volts across the red and black wires

on three wire 120/240 volt dispens-

ers.

(B) Check circuit breakers or fuses.

Refer to Service - Dispense Switch

for testing procedure. See page 21

3. Dispense Switch

RefertoService-DispenseSolenoid

Valve for testing procedures. See

page 34

4. Dispense Solenoid Valve

29112 101598

TROUBLESHOOTING (cont.)

PROBLEM

Product will not dispense (cont.)

PROBABLE CAUSE

5. Solenoid Valve (Inlet)

REMEDY

Refer to Service - Solenoid Valve

(Inlet) for testing procedures. See

page 35

6. A) Level Control Board and Probe RefertoService-LevelControlBoard

- FMD-1

and Probe for testing procedures.

See page 29

B)ControlBoardandProbe-FMD- Refer to Service - Control Board and

Probe for testing procedures. See

page 19

7. A) Auger Drive - FMD-1

Refer to Service - Auger Drive. See

page 13

B) Auger Drive - FMD-2

8. Water Strainer

Refer to Service - Auger Drive. See

Page 15

(A) Direction of flow arrow must be

pointing towards dispenser.

(B) Remove the strainer and check

for obstructions. Clear or replace.

9. Lime build-up

Inspectthetankassemblyforexces-

CAUTION - Tank and tank compo- sive lime deposits. Delime as re-

nents should be delimed regularly quired.

dependingonlocalwaterconditions.

Excessivemineralbuild-uponstain-

lesssteelsurfacescaninitiatecorro-

sive reactions resulting in serious

leaks.

10. Transformer - FMD-2

Refer to Service - Transformer for

testing procedures. See page 38

1. Limit Thermostat

Refer to Service - Limit Thermostat

Water is not hot

CAUTION - Do not eliminate or by- for testing procedures. See page 31

passlimitthermostat.UseonlyBOM

replacement part #29329.1000

2. Control Thermostat

Refer to Service - Control Thermo-

statfortestingprocedures.Seepage

3. Tank Heater

Refer to Service - Tank Heater for

testing procedures. See page 36

29112 051200

TROUBLESHOOTING (cont.)

PROBLEM

PROBABLE CAUSE

REMEDY

Water is not hot (Cont.)

4. Tank Heater Switch

RefertoService -TankHeaterSwitch

for testing procedures. See page 37

Spitting or excessive steaming

1. Lime build-up

Inspectthetankassemblyforexces-

CAUTION - Tank and tank compo- sive lime deposits. Delime as re-

nents should be delimed regularly quired.

dependingonlocalwaterconditions.

Excessivemineralbuild-uponstain-

lesssteelsurfacescaninitiatecorro-

sive reactions resulting in serious

leaks.

2. Control Thermostat

Refer to Service - Control Thermo-

stat for testing procedures. See

page 18

Dripping from dispense tip

1. Lime build-up

Inspectthetankassemblyforexces-

CAUTION - Tank and tank compo- sive lime deposits. Delime as re-

nents should be delimed regularly quired.

dependingonlocalwaterconditions.

Excessivemineralbuild-uponstain-

lesssteelsurfacescaninitiatecorro-

sive reactions resulting in serious

leaks.

2. Dispense Solenoid Valve

Removethedispensesolenoidvalve

and clear any obstructions. Rebuild

orreplacethevalveifnecessary.See

page 34

Water flows into tank continuously

1. A) Level Control Board and Probe RefertoService-LevelControlBoard

- FMD-1

and Probe for testing procedures.

See page 29

B)ControlBoardandProbe-FMD- Refer to Service - Control Board and

Probe for testing procedures. See

page 19

2. Solenoid Valve (Inlet)

Refer to Service - Solenoid Valve

(Inlet) for testing procedures. See

page 35

29112 101598

TROUBLESHOOTING (cont.)

PROBLEM

REMEDY

PROBABLE CAUSE

Product overflows container

Refer to Service - Dispense Switch

for testing procedures. See page 21

1. Dispense Switch

Removethesolenoidvalveandclear

anyobstructions. Rebuildorreplace

the valve if necessary. See page 34

2. Dispense Solenoid Valve

1. Water Temperature

Weak product

Place an empty container beneath

the dispense tip. Initiate a dispense

cycle and check the water tempera-

tureimmediatelybelowthedispense

tip with a thermometer.

Reading for mechanical thermostat

models should be 180°F to 200°F

(seethermostattemperaturesettings

decal in USER NOTICES on page 3.)

Referto Service-WhipperMotorfor

testing procedure. See page 24

2. Whipper Motor

3. Frother

Refer to Service - Frother Compo-

nents. See page 24

RefertoService-DispenseSolenoid

Valve for test procedures. See page

4. Dispense Solenoid Valve

Refer to Service - Auger Drive Com-

ponents. See page 13

See page 15

5. Auger Drive - FMD-1

Auger Drive - FMD-2

Refer to Service - Auger Drive Com-

ponents. See page 13

See page 15

6. Auger Spring - FMD-1

Auger Spring - FMD-2

7. Auger Motor - FMD-1

Auger Motor - FMD-2

Refer to Service - Auger Drive Com-

ponents. See page 13

See page 15

Refer to Service - Rinse/Run Switch

for test procedures. See page 31

See page 32

8. Rinse/Run Switch - FMD-1

Rinse/Run Switch - FMD-2

9. Rinse Timer - FMD-2

Refer to Operation - Rinse Timer.

See Page 5

29112 101598

TROUBLESHOOTING (CONT.)

PROBLEM

REMEDY

PROBABLE CAUSE

Plumbing lines should not be rest-

ing on the counter top.

1. Plumbing Lines

Dispenser is making unusual

noises

(A)Thedispensermustbeconnected

to a cold water line

2. Water Supply

(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 36

3. Tank Heater

Refer to Service - Fan for testing

procedures. See page 23

1. Fan

Excess dust

RefertoService-HopperDriveBoard

for testing procedures. See page 26

2. A) Hopper Drive Board - FMD-1

B) Control board - FMD-2

1. Lamp

Refer to Service - Control Board for

testing procedures. See page 19

RefertoService- Lamp,seepage28

for lamp replacement.

Display not lit

Refer to Service - Lamp Holder for

testing procedures. See page 28

2. Lamp Holder

3. Starter - Lamp

4. Ballast

Refer to Service - Starter for testing

procedures. See page 29

Refer to Service - Ballast for testing

procedures. See page 17

29112 051200

AUGER DRIVE COMPONENTS FMD-1

SERVICE

This section provides procedures for testing and

replacing various major components used in this

dispenser should service become necessary. Re-

fer to Troubleshooting for assistance in determin-

ing the cause of any problem.

WARNING - Inspection, testing, and repair of electri-

cal equipment should be performed only by quali-

fied service personnel. The dispenser should be

unplugged when servicing, except when electrical

tests are required and the test procedure specifi-

cally states to plug-in the dispenser.

COMPONENT ACCESS

WARNING-Disconnectthedispenser fromthepower

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, splashpanelw/driptray, lowerfrontaccess

panel and rear access cover.

Refer to the contents listing for component loca-

tion.

P1665

FIG. 1 AUGER DRIVE COMPONENTS

Location

The auger components are located inside the

bottom part of the hopper except for the auger drive

bracket, spacer and retaing 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. 2 for disassembly and

assembly.

Contents

Auger Drive Components (FMD-1) .......................13

Auger Drive Components (FMD-2) .......................15

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

Control Thermostat...............................................18

Control Board (FMD-2) .........................................19

Dispense Switch ...................................................21

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

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

Hopper Drive Board(FMD-1).................................26

Increase/Decrease Switch (FMD-2) ......................27

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

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

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

Level Control Board and Level Probe (FMD-1) .....29

Limit Thermostat ..................................................31

Rinse/Run Switch (FMD-1)...................................31

Rinse/Run Switch (FMD-2)...................................32

Solenoid (Cold Water - Optional FMD-2 Only) ......33

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

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

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

Tank Heater Switch ...............................................37

Transformer (FMD-2)............................................38

Whipper Motor .....................................................24

Wiring Diagram ...............................................39,40

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 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 indica-

tion 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.

4. Disconnect the dispenser from the power sup-

ply.

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

If voltage is not present as described, refer to the wir-

ing diagram and check the dispenser wiring harness.

29112 101598

SERVICE

AUGER DRIVE COMPONENTS - FMD-1 (CONT.)

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

auger hopper drive board.

Removal, Cleaning and Replacement

Hopper & Auger

1. Open the dispenser door and raise the top front

cover.

2. Lift the hopper assy (17) over the pins (16) on

hopper support plate (12) and slide hopper as-

sembly out the front of the dispenser.

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

4. Pull off the ejector elbow (15).

5. Remove retainer clip (11) and washer (10) from

the bottom of the hopper base (9).

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

wiper drive gear (5) from the hopper base (9).

7. Remove auger wire (14) by pulling it out the front

of the hopper base (9).

8. Remove auger drive shaft (13) by removing the

retaining clip (6) from auger drive shaft.

9. Slide spacer (8) and auger drive shaft bracket (7)

off of the auger drive shaft (13).

18 19 20 21

P1667

FIG. 2 AUGER DRIVE & HOPPER DISASSEMBLY

10. Remove auger drive shaft (13) from hopper base

(9).

1. Hopper Lid

2. Hopper

12. Hopper Support Plate

13. Auger Drive Shaft

14. Auger Wire

15. Ejector Elbow

16. Hopper Locating Pins

17. Hopper Assembly

18. Auger Motor Bracket

19. Auger Motor

11. Washcomponentsinamildsolutionofdishdeter-

gent using a bristle brush when needed.

12. Rinse and dry each item thoroughly.

13. Check for damaged or broken components, re-

place any if necessary and reassemble hopper

assembly.

14. Installhopperassy(17)in thedispenserbysliding

hopperassy onthehoppersupportplate(12)until

the slot in the rear of the hopper base (9) seats

against the pins (16) in the hopper support plate

(12).

3. Wiper Shaft

4. Wiper Blade

5. Wiper Drive Gear

6. Retainer Clip

7. Auger Drive Bracket

8. Spacer

9. Hopper Base

10. Washer

11. Retainer Clip

20. Dust Seal

21. Auger Motor Mount-

ing panel

29112 101598

AUGER DRIVE COMPONENTS - FMD-2

SERVICE (cont.)

AUGER DRIVE COMPONENTS - FMD-1 (cont.)

Auger Drive Motor (Refer to Fig. 2)

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

sembly.

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

per support plate (12), 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 (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 hopper drive board.

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

ger motor (19) and dust seal (20) as an assembly.

6. Remove dust seal (20) from auger motor (19).

7. Disconnect the wires from the auger motor (19).

8. Removethefour#8-32screwssecuringthe auger

motor (19) to the auger motor mounting bracket

(18).

9. Remove auger motor (19) and discard.

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

(19) on mounting bracket (18).

11. Install dust seal (20) on auger motor shaft and

align notch in seal with motor casting.

12. Reconnect the wires to the terminals on the hop-

per drive board.

13. Refer to Fig. 3 when reconnecting wires.

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

motor, dust seal and mounting bracket to the rear

of the auger motor mounting panel (21).

15. Install hopper assy (17).

P1666

FIG. 4 AUGER DRIVE COMPONENTS

Location

The auger components are located inside

the bottom part of the hopper except for the auger

drive bracket, washer and locknut, which are located

on the outside bottom rear of the hopper. The auger

motors are located on the rear of the auger motor

mounting panel. Refer to Fig. 5 for disassembly and

assembly.

Test Procedures - Auger motors

1. Disconnect the dispenser from the power source.

2. Disconnect the wires from the motor to be tested.

3. Check the voltage across the positive (white/or-

ange) wire for the right motor, or the positive

(white/red) wire for the left motor and the negative

(green) wire with a voltmeter. With the rinse/run

switch in the run (lower) position press and hold

the appropriate dispense switch. Connect the dis-

penser to the power supply. After a .6 second

delay the indication must be 4.0 to 24.5 volts dc.

REDtoHopperSpeed

Control Board (+)

BLK to Hopper Speed

Control Board (-)

P1639

FIG. 3 AUGER MOTOR TERMINALS

29112 101598

SERVICE (cont.)

AUGER DRIVE COMPONENTS - FMD-2 (CONT.)

4. Disconnect the dispenser from the power supply.

If voltage is present as described and the auger does

not turn, replace the auger motor.

If voltage is not present as described, refer to the wir-

ing diagrams and check the dispenser wiring harness.

Removal, Cleaning and Replacement

Hopper & Auger

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 hop-

per 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 bush-

ing (3) and remove auger drive shaft bushing

from hopper (10).

15 16 17 14 18 19

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, re-

place any if necessary and reassemble hopper

assy.

14. Installhopperassy(20)in thedispenserbysliding

hopper assy in the guides on the hopper support

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

hopper seats against the pin (18) in the hopper

support plate.

P1673

FIG. 5 AUGER DRIVE & HOPPER DISASSEMBLY

11. Spring

12. Auger Wire

13. Ejector Elbow

1. Hopper Lid

2. Agitator Disc Assy

3. Auger Drive Shaft

Bushing

4. Agitator Support Rod

5. Auger Drive Shaft

14. Auger Motor Mount-

ing Panel

15. Auger Motor Bracket

16. Auger Motor

6. Retainer Clip

17. Dust Seal

7. Auger Drive Bracket

18. Pins

8. Washer

9. Locknut

10. Hopper

19. Hopper Support plate

20. Hopper Assy

29112 101598

SERVICE (cont.)

LEFT

AUGER DRIVE COMPONENTS - FMD-2 (cont.)

RIGHT

Auger Drive Motor (Refer to Fig. 5)

1. Remove all hopper assemblies (20) and set aside

for reassembly.

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

per support plate (19), remove plate and set aside

for reassembly.

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

inside the dispenser housing on the front of the

auger motor mounting panel (14), securing auger

motor mounting bracket (15) and auger motor

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

(14).

RED to WHI/ORN from

Control Board J3-2

BLK to GRN from

Control Board J3-4

4. Disconnect the wires from the auger motor (16) to

be removed.

BLK to GRN from

Control Board J3-4

RED to WHI/RED from

Control Board J3-3

5. Remove auger motor mounting bracket (15), au-

ger motor (16) and dust seal (17) as an assembly.

6. Remove dust seal (17) from auger motor (16).

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

motor to the auger motor mounting bracket.

8. Remove auger motor and discard.

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

(16) on mounting bracket (15).

P1639

FIG. 6 AUGER MOTOR TERMINALS

BALLAST - FMD-1 & FMD-2

10. Install dust seal (17) on auger motor shaft.

11. Using four #8-32 locking screws install auger

motor, dust seal and mounting bracket to the rear

of the auger motor mounting panel (14)

12. Reconnect the wires to the terminals on the auger

motor.

13. Install hopper support plate (19) and all hopper

assemblies (20).

14. Refer to Fig. 6 when reconnecting wires.

FMD-1

P1665

FMD-2

P1666

FIG. 7 BALLAST

29112 101598

tightenthetwo#8-32screwssecuringthecompo-

nent bracket to the dispenser housing base.

SERVICE (cont.)

BALLAST - FMD-1 & FMD-2 (cont.)

Location

FMD-1

BLK to BLK

from Main

Wiring Harness

The front door lamp ballast is located behind

the front access panel on the left front side of the com-

ponent bracket.

BLK to BLU from

Main Harness

FMD-2

The front door lamp ballast is located behind

the front access panel on the left rear side of the com-

ponent bracket.

P1447

FIG. 8 BALLAST TERMINALS

CONTROL THERMOSTAT - FMD-1 & FMD-2

Test Procedure

1. Disconnect the dispenser from the power source.

2. Disconnect the two black lead 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

operating properly.

If continuity is not present as described, replace the

ballast.

Removal and Replacement

FMD-1

1. Disconnect the wires from the ballast.

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

last to the component bracket.

3. Remove and discard ballast.

4. Using two #8-32 screws install new ballast on the

component bracket.

P1665

FIG. 9 CONTROL THERMOSTAT

Location

The control thermostat is located under the

front tank mounting bracket on the upper right side of

the dispenser housing.

5. Refer to the Fig. 8 when reconnecting the wires.

FMD-2

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 dis-

penser far enough so the leads on the ballast can

bedisconnectedfromthemainwiringharnessand

the door interconnect harness.

3. Removethetwo#8-32screwssecuringtheballast

the rear of the component bracket.

4. Remove and discard ballast.

5. Install new ballast on the rear of the component

bracket and secure with two #8-32 screws.

6. Refer to Fig. 8 and reconnect the wires.

7. Place the component bracket into position and

Test Procedure

1. Disconnect the dispenser from the power source.

2. Disconnect the black wire of the control thermo-

stat from the black lead from the limit thermostat.

3. Remove bulb from the tank.

4. 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 with a voltmeter. Connect the dis-

penser to the power source. The indication must

be:

29112 101598

CONTROL BOARD - FMD-2 ONLY

SERVICE (cont.)

CONTROL THERMOSTAT - FMD-1 & FMD-2 (cont.)

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

b)208voltsacforthreewire120/208volt models.

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

5. Disconnect the dispenser from the power source.

If voltage is present as described the control thermo-

stat is operating properly. Reinstall bulb into the tank.

If voltage is not present as described, replace the

thermostat.

Removal and Replacement.

1. Remove the thermostat capillary bulb by firmly

pulling-up on the capillary at the tank lid. This will

disengage the grommet from the tank lid.

2. Loosen the two #6-32 screws securing the ther-

mostat to the front tank mounting bracket.

3. Disconnect the wires from the thermostat.

4. Remove thermostat and remove the screws and

spacers from the thermostat.

5. Discard thermostat.

6. Install two spacers and two #6-32 screws on the

new thermostat.

7. Position the thermostat on the botttom side of the

front tank mounting bracket and tighten the two

#6-32 screws.

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

on the new capillary tube.

P1666

FIG. 11 CONTROL BOARD

Location:

The Control Board is located behind the lower

frontaccesscovermountedonthecomponentbracket.

9. Insert the capillary bulb 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.

10. 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.

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

NOTE - The capillary tube must be clear of any electri-

cal termination and not kinked.

Test Procedure:

Liquid Level Control Circuitry:

1. Disconnect the dispenser from the power source.

2. Disconnect the six pin connector from J3 of the

control board.

3. Check the voltage across pins 5 & 6 of the six pin

connector on the wiring harness with a voltmeter.

Connect the dispenser to the power source. The

indication must be 24 volts ac.

4. Disconnect the dispenser from the power source.

BLK from Limit

Thermostat

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 har-

ness.

5. Reconnect the six pin connector of the wiring

harness to J3 of the control board.

BLK from Tank

Heater Switch

P1668

FIG. 10 THERMOSTAT TERMINALS

29112 101598

SERVICE (cont.)

16. Reconnect the ten pin connector of the wiring

harness to J2 of the control board.

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

and inspect for corrosion. Replace it if necessary.

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

with any metal surface of the dispenser.

19. Check the voltage across the terminals of the inlet

solenoid valve with a voltmeter. Connect the dis-

penser 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 afteradelayofapproximately10seconds.

20. Move the probe’s flat end to the dispenser hous-

ing. The indication must be 0.

21. 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 after a

delay of approximately 5 seconds.

CONTROL BOARD - FMD-2 ONLY (CONT.)

6. Disconnect the four pin connector from J4 of the

control board.

7. Check the voltage across pins 1 & 4 of the four pin

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

voltmodels, threewire120/208voltmodels, three

wire 120/240 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 har-

ness.

9. Reconnect the four pin connector of the wiring

harness to J4 of the control board.

22. Disconnect the dispenser from the power source.

10. Disconnect the ten pin connector from J2 of the

control board.

11. Carefully connect a piece of insulated jumper wire

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

Keep the other end of this wire away from any

metal surfaces of the dispenser.

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.

12. Check the voltage across the terminals of the inlet

solenoid valve with a voltmeter. Connect the dis-

penser 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 after a delay of approximately 10 seconds.

13. Touch the free end of the jumper wire to the

dispenser housing. The indication must be 0.

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

indicationmust, again, be120voltsacfortwowire

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

three wire 120/240 volt models after a delay of

approximately 5 seconds.

Hopper Motor Control Circuitry:

1. Disconnect the dispenser from the power source.

2. Disconnect the six pin connector from J3 of the

control board.

3. Check the voltage across pins 5 & 6 of the six pin

connector on the wiring harness with a voltmeter.

Connect the dispenser to the power source. The

indication must be 24 volts ac.

4. 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 har-

ness.

15. Disconnect the dispenser from the power source

and remove the jumper wire.

5. Reconnect the six pin connector of the wiring

harness to J3 of the control board.

6. Check that the rinse/run switch is in the run

position.

If voltage is present as described, proceed to step 16.

If the voltage is not present as described, replace the

control circuit board.

29112 101598

DISPENSE SWITCH(S) - FMD-1 & FMD-2

SERVICE (cont.)

CONTROL BOARD - FMD-2 ONLY (CONT.)

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

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

voltmeter. 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.

Removal and Replacement:

1. Disconnect the three plugs on the main wiring

harnessfromtheconnectorsonthecontrolboard.

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

control board to the component bracket.

3. Remove control board and discard.

4. Installnewcontrolboardonthecomponentbracket

using four #6-32 keps nuts.

HEN CUP IS 2/3 FULL

TTO

RELEASE BU

PLACE

CUP HERE

FMD-1

5. Reconnect the three plugs on the main harness to

the connectors on the control board.

J2 J3

PLACE

RELEASE BUTTON WHEN CUP IS 2/3 FULL

CUP HERE

PLACE

CUP HERE

FMD-2

P1614

FIG.13 DISPENSE SWITCH

P1640

Location:

FIG. 12 CONTROL BOARD CONNECTORS

The dispense switch(es) is (are) located on

the lower outside of the dispenser door.

29112 101598

SERVICE (cont.)

5. Disconnect the dispenser from the power source.

DISPENSE SWITCH(S) - FMD-1 & FMD-2 (cont.)

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

If voltage is not present as described, refer to the wir-

ing diagram and check the dispenser wiring harness.

Test Procedure:

FMD-1

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

wiring harness to the dispense switch.

4. Checkforvoltageacrosstheblackwireandthered

wire from the door interconnect wiring harness.

Connect the dispenser to the power supply. The

indication must be:

6. With a voltmeter, check the voltage across the

black/white (+) and orange (-) wires for the right

dispense switch, or blue/white (+) and orange (-)

fortheleftdispenseswitchfromthedoorintercon-

nect wiring harness. Connect the dispenser to the

power source. The indication must be +5 volts dc.

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 har-

ness.

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.

5. Disconnect the dispenser from the power source.

7. Check for continuity across the terminals (top

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

dispense switch with the switch in the “ON” posi-

tion. Continuity must not present when the switch

is in the “OFF” released position.

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

If voltage is not present as described, refer to the wir-

ing diagram and check the dispenser wiring harness.

6. Check for continuity across the terminals with the

switch in the“ON” pressed position. Continuity

must not be 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.

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 five #6-32 screws securing the bot-

tom 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 dis-

pense 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 five #6-32

screws.

FMD-2

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

wiringharnesstothedispenseswitchtobetested.

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

wiresfortherightdispenseswitchortheblackand

redwiresfortheleftdispenseswitchfromthedoor

interconnect wiring harness. Connect the dis-

penser to the power supply. The indication must

be:

8. Refer to Fig. 14 when reconnecting wires.

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.

29112 101598

Location:

The fan is located inside the dispenser hous-

ing on the right rear of the dispenser base plate.

SERVICE (cont.)

DISPENSE SWITCH(S) - FMD-1 & FMD-2 (cont.)

BLK

RED

Test Procedures:

1. Disconnect the dispenser from the power source.

2. Disconnect the black and white wires from the fan

terminals.

3. Checkthevoltageacrosstheblackandwhitewires

on the main harness with a voltmeter. Connect the

dispenser to the power source. The indication

must be:

FMD-1

BLK

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

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

240 volt models.

RED/WHI

BLK

RED

If voltage is present as described, replace the fan

If voltage is not present as described, refer to wiring

diagram and check the dispenser wiring harness.

RIGHT

ORN

BLK/WHI

LEFT

ORN

BLU/WHI

Removal and Replacement:

FMD-2

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

P1449

FIG. 14 DISPENSE SWITCH TERMINALS

FAN - FMD-1 & FMD-2

4. Refer to Fig. 16 and connect the wires to the new

fan.

5. Install new fan through the rear access hole and

secure to the dispenser housing base plate using

two #8-32 locking screws.

6. Reconnect the vacuum hose to the fan.

BLK from Control Harness

WHI from Control Harness

P1507

P1665

FIG. 16 FAN TERMINALS

FIG. 15 FAN

29112 101598

4. Disconnect the dispenser from the power source.

SERVICE (cont.)

FROTHER AND WHIPPER MOTOR - FMD-1 (shown)

& FMD-2

If voltage is present as described, replace the motor.

If voltage is not present as described, refer to the wir-

ing diagrams and check the dispenser wiring harness.

11 12

10 9

6 5

P1619

FIG. 18 MIXING/WHIPPER CHAMBER

COMPONENTS

P1665

1. Steam Collector

8. Nut

FIG. 17 FROTHER AND WHIPPER MOTOR

Location:

The frother(s) is (are) located behind the dis-

penser door, mounted on the front panel inside the

whipper chamber.

2. Mixing Chamber

3. Dispense Tip

4. Whipper Chamber

5. O-Ring

9. Slinger

10. Motor Assy.

11. Fan

12. Vacuum Hose

13. Baffle

6. Frother

7. Receptacle w/Seal

The whipper motor(s) is (are) located on the

back side of the whipper motor mounting panel.

Removal, Cleaning and Replacement (Refer to Fig.

18):

1. Open the dispenser door and raise the top front

cover.

2. Lift the front edge of the each hopper assembly

over the tab on the hopper support panel and

slide each hopper assembly out the front of the

dispenser. Set aside for reassembly.

3. Remove the four #8-32 screws securing the hop-

per support panel to auger motor mounting

panel and the whipper motor mounting panel.

Set aside for reassembly.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Disconnect the red and white wires (FMD-1 &

FMD-2 left motor) or orange and white wires

(FMD-2 right motor) of the main harness from the

black leads of the motor.

3. Press and hold the dispense switch and check the

voltage across the disconnected harness wires

with a voltmeter. Connect the dispenser to the

power source. The reading 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.

4. Disconnect vacuum hose (12) from fan baffle

(13).

29112 101598

23. Install whipper chamber (4) on the whipper cham-

ber receptacle (7) by twisting counterclockwise

untilthetabsonthewhipperchamber(4)lockwith

the tabs on the whipper chamber receptacle (7).

Be sure dispense port is pointing down.

24. Install dispense tip (3) into the bottom of the

whipper chamber (4).

25. Using two #4-40 screws secure the fan baffle to

the whipper motor mounting panel.

26. Install vacuum hose (12) on fan baffle (13).

27. Install hopper support panel using four #8-32

screws.

28. 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).

29. Install the steam collector (1) onto the mixing

chamber (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.

30. Installhopperassemblyinthedispenserbysliding

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.

SERVICE (cont.)

FROTHER AND WHIPPER MOTOR - FMD-1

(shown) & FMD-2 (cont.)

5. Remove the steam collector (1) by pulling it for-

ward and at the same time twisting it clockwise.

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

chamber (4).

7. Remove the two #4-40 x .25" screws securing the

fan baffle (13) to the whipper motor mounting

panel and remove fan baffle. Set aside for reas-

sembly.

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

chamber (4) clockwise and pull it off the whipper

chamber receptacle (7).

9. 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.

10. Slip the O-ring (5) off the whipper chamber recep-

tacle (7).

11. Slide the receptacle w/seal off of the motor shaft.

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

13. Remove the two nuts (8) securing whipper cham-

ber receptacle (7) and whipper motor (10) to the

front panel.

NOTE: To remove the receptacle only rotate clockwise

until the receptacle clears the nuts (8) and slide off

of the motor shaft.

14. Disconnect the black leads on the motor (10) from

the main wiring harness.

15. Remove motor and discard.

BLK to Main Harness RED

BLK to Main Harness WHI

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

secure with two nuts (8) and connect black leads

on the motor to the main wiring harness. Refer to

Fig. 19 when reconnecting wires

FMD-1

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

the front panel.

18. Wash remaining components in a mild solution of

dish detergent using a bristle brush.

BLK to Main Harness ORN

BLK to Main Harness WHI

19. Rinse thoroughly and allow to dry before reinstall-

ing in the dispenser.

20. Slide whipper chamber receptacle w/seal (7) and

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

21. Rotate the receptacle w/seal (7) counterclockwise

until it snaps into place on the motor mounting

nuts (8).

22. Pushfrother(6)ontothemotorshaft, makingsure

theflatinthefrother(6)linesupwiththeflatonthe

motor shaft.

BLK to Main Harness Red

BLK to Main Harness WHI

LEFT

RIGHT

FMD-2

FIG.19 WHIPPER MOTOR TERMINALS

P1221

29112 101598

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.

SERVICE (cont.)

HOPPER DRIVE BOARD - FMD-1 ONLY

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

hopper drive board.

Removal and Replacement: (Refer to Fig. 2)

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

sembly.

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

per 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), au-

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

board as an assembly.

P1665

FIG. 20 HOPPER DRIVE BOARD

Location

The hopper drive board is located inside the

dispenser mounted on the auger motor mounting

bracket.

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

per 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. 21 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. 21.

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.

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.

4. Disconnect the dispenser from the power supply.

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

If voltage is not present as described, refer to the wir-

ing diagram and check the dispenser wiring harness.

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

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

screws.

14. Install hopper assy (17).

29112 101598

Test Procedure:

SERVICE (cont.)

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).

HOPPER DRIVE BOARD - FMD-1 ONLY (cont.)

RED from Hopper

Motor

J1 Connector for

Three Pin Plug from

Potentiometer

If continuity is present as described, the switch is

operating properly.

If continuity is not present as described, replace the

switch.

BLK from

Hopper Motor

Removal and Replacement:

1. Open the dispenser door.

RED/WHI from

Main Harness

WHI from Main

2. Remove the facenut securing the increase/de-

crease 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.

Harness

P1669

FIG. 21 HOPPER DRIVE BOARD TERMINALS

INCREASE/DECREASE SWITCH - FMD-2 ONLY

5. Refer to Fig. 23 when connecting the wires to the

new switch.

6. Install new switch with wires attached through the

hole in the whipper mounting panel and secure

with facenut.

RED/BLK from Control

Board J2-6

GRN from Control

Board J2-9

BRN/BLK from Control

Board J2-1

P1208

FIG. 23 INCREASE/DECREASE SWITCH

TERMINALS

P1666

FIG. 22 INCREASE/DECREASE SWITCH

Location:

The increase/decrease switch is located on the

lower left front of the whipper motor mounting panel.

29112 101598

Removal and Replacement:

1. Open dispenser door (1).

SERVICE (cont.)

LAMP HOLDER - FMD-1 (shown) & FMD-2

2. Remove the four #8-32 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 two #8-32 screws securing the upper

door panel (4) to the door.

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 hold-

ers (2).

8. Removethe#6-32screwsecuringthelampholder

(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.

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

until the pins snap in place.

P1670

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

ers (2) and door wiring harness as an assembly

using two #8-32 screws.

13. Reconnect the plug on the door wiring harness to

the connector on the door interconnect wiring

harness.

FIG. 24 LAMP HOLDERS

1. Door Assy

2. Lamp Holders

3. Lamp

4. Upper Panel

5. Lower Panel

6. Starter W/Socket

Location:

The lamp holders are located on the front of

the upper panel behind the display panel.

14. Install the door lower panel (5) using four #8-32

screws.

LAMP REPLACEMENT (Refer to Fig. 24)

1. Open dispenser door (1).

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

holders.

2. Remove the four #8-32 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 two #8-32 screws securing the upper

door panel (4) to the door.

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

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

bly.

If continuity is present as described, lamp holders are

operating properly.

If continuity is not present as described replace the

lamp holder.

6. Rotate lamp (3) 90° and remove from lamp hold-

ers (2).

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

until the pins snap in place.

8. Install upper door panel (4), lamp (3), lamp hold-

ers (2) and door wiring harness as an assembly

using two #8-32 screws.

29112 101598

7. Insertnewstarter(6)intosocketandturn90° 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.

SERVICE (cont.)

LAMP REPLACEMENT (Refer to Fig.24)(cont.)

9. Reconnect the plug on the door wiring harness to

the connector on the door interconnect wiring

harness.

10. Install the door lower panel (5) using four #8-32

screws.

9. Connect the sockets leads to the door wiring

harness.

10. Installdoorlowerpanel (5)withstarterandstarter

socket on door assy (1) using four #8-32 screws.

LAMP STARTER and SOCKET (Refer to Fig. 24)

Location:

The lamp starter (6) is located inside the door

assy (1) on the top of the door lower panel (5).

LEVEL CONTROL BOARD AND LEVEL PROBE -

FMD-1 ONLY

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.

5. Remove starter (6) from starter socket.

6. Check for continuity across the pins on the bottom

of the starter (6).

Ifcontinuityispresentasdescribed,replacethestarter.

If continuity is not present as described, starter is

operating properly.

Note:Ifcontinuitytestsarebothasdescribedandlamp

does not light, replace the starter.

P1665

FIG. 25 LEVEL CONTROL BOARD AND PROBE

Removal and Replacement (Refer to Fig.24):

1. Open dispenser door assy (1)

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

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

3. Disconnecttheleadsonthestartersocketfromthe

door wiring harness.

Location:

The level control board is located behind the

lower access panel mounted on the right side of the

component bracket.

The Level probe is located on the left center

of the tank lid just in front of the overflow tube.

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

(6) as assembly.

5. Compress the spring tabs on the socket and re-

move socket from the door bottom cover (5).

6. Rotate starter 90° and remove from the starter

socket.

29112 101598

SERVICE (cont.)

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

voltmeter. Connect the dispenser to the power

source.Theindicationmustbe120voltsacfortwo

wire 120 volt models, three wire 120/208 volt

models, three wire 120/240 volt models after a

delay of approximately 5 seconds.

15. Move the probe's flat end to the tank. The indica-

tion must be 0.

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

indication should again be 120 volts ac for two

wire 120 volt models, three wire 120/208 volt

models, three wire 120/240 volt models after a

delay of approximately 5 seconds.

LEVEL CONTROL BOARD AND LEVEL PROBE -

FMD-1 ONLY (cont.)

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Removethevioletwirefromterminal1&pinkwire

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 120 volts ac for

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

models, three wire 120/240 volt models.

4. Disconnect the dispenser from the power source.

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.

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

If voltage is not present as described, refer to the

wiringdiagramandcheckthedispenserwiringhaness.

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.Theindicationmustbe120voltsacfortwo

wire 120 volt models, three wire 120/208 volt

models, three wire 120/240 volt models after a

delay of approximately 5 seconds.

Removal and Replacement:

1. Remove all wires from the level control board.

2. Removetwo#8-32 kepsnutsholdinglevelcontrol

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 Fig. 26 when reconnecting the wires.

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

nent bracket. The indication must be 0.

9. Move the jumper wire away from the component

bracket. 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 after

a delay of approximately 5 seconds.

TI VIO to Inlet Solenoid Coil

T2 BLK to Main Harness

T3 WHI to Main Harness

T4 PNK to Probe

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.

P1671

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.

FIG. 26 LEVEL BOARD TERMINALS

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

with any metal surface of the dispenser.

29112 101598

SERVICE (cont.)

BLK to Tank Heater

LIMIT THERMOSTAT - FMD-1 (shown) & FMD-2

BLK to Control

Thermostat

P1800

FIG. 28 LIMIT THERMOSTAT TERMINALS

RINSE/RUN SWITCH - FMD-1

P1665

FIG. 27 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 ther-

mostat.

3. Check for continuity across the limit thermostat

terminals.

P1665

FIG. 29 RINSE/RUN SWITCH

If continuity is present as described, the limit thermo-

stat is operating properly.

Location:

If continuity is not present as described, replace the

limit thermostat.

The rinse/run switch is located on the lower

left side of the whipper motor mounting panel.

Removal and Replacement:

1. Remove all wires from the limit thermostat ter-

minals.

2. Carefully slide the limit thermostat out from un-

der the retaining clip and remove the limit ther-

mostat.

3. Carefully slide the new limit thermostat into the

retaining clip.

Test Procedures:

1. Disconnect the dispenser from the power source.

2. Check for continuity between center terminal and

the upper terminal with the switch in the “RUN”

lower position. Continuity must not be present

with the switch in the “RINSE” upper position.

If continuity is present as described, the switch is

operating properly.

4. Refer to Fig. 28 when reconnecting the wires.

If continuity is not present as described, replace the

switch.

Removal and Replacement:

1. Open the dispenser door.

29112 051200

Test Procedures:

SERVICE (cont.)

1. Disconnect the dispenser from the power source.

2. Check for continuity between the center left ter-

minal and left bottom terminal, also between the

center right terminal and the right bottom termi-

nal with the switch in the rinse position (upper).

Check for continuity across the center left termi-

nal 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.

RINSE/RUN SWITCH - FMD-1 (CONT.)

2. Remove the facenut securing the run/rinse switch

to the dispenser front panel.

3. Remove switch with wires attached from the back

side of the front panel.

4. Disconnect the wires from the switch and dis-

card the switch.

5. Refer to Fig. 30 when connecting wires to the

new switch.

6. Install new switch with wires attached through

the hole in the front panel and secure with facenut.

If continuity is present as described, the switch is

operating properly.

If continuity is not present as described, replace the

switch.

RED from Main

Wiring Harness

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 dis-

card the switch.

WHI/RED to

Main Harness

5. Refer to Fig. 32 when connecting the wires to

the new switch.

P1456

FIG. 30 RINSE/RUN SWITCH TERMINALS

6. Install new switch with wires attached through

the hole in the whipper motor mounting panel

and secure with facenut.

RINSE/RUN SWITCH - FMD-2

GRY to Control

Board J2-2

WHI/BRN to

Main Harness

GRN to Control

Board J2-9

BLK from

Main Harness

WHI/BRN to

Main Harness

YEL to Control

Board J2-3

P1644

P1666

FIG. 31 RINSE/RUN SWITCH

FIG. 32 RINSE/RUN SWITCH TERMINALS

Location:

The rinse/run switch is located on the lower

center of the whipper motor mounting panel.

29112 101598

6. Check the solenoid valve for coil action. Connect

the dispenser to the power source. With the cold

jumperpluginstalledpresstheleftdispenseswitch

and listen carefully in the vicinity of the solenoid

valvefora“clicking”soundasthemagnetattracts.

7. Disconnect the dispenser from the power source.

SERVICE (cont.)

SOLENOID VALVE (COLD WATER

OPTIONAL)(FMD-2 ONLY)

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:

P1666

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 blue from the solenoid

valve.

3. Turn-off the water supply to the dispenser.

4. Disconnect the water lines to and from the sole-

noid 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 lockwashers

securingthesolenoidvalvetothesolenoidbracket.

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

new solenoidvalveonsolenoidmountingbracket.

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.

FIG. 33 COLD WATER SOLENOID VALVE

Location:

The cold water solenoid valve is located on

the left side of the dispenser base just behind the com-

ponent bracket.

Test Procedures:

1. Disconnectthedispenserfromthepowersource.

2. Disconnect the white and blue wires from the

solenoid valve. With the cold jumper plug in-

stalled press the left dispense switch on front of

the door.

3. Checkthevoltageacrossthewhiteandbluewires

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 and 120/240 volt models.

4. Disconnectthedispenser fromthepowersource.

10. Refer to Fig. 34 when reconnecting the wires.

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.

BLU to Main Harness

WHI to Main Wiring

Harness

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.

P1215

FIG. 34 COLD WATER SOLENOID TERMINALS

29112 101598

Test Procedures:

SERVICE (cont.)

1. Disconnectthedispenserfromthepowersource.

2. For FMD-1 disconnect the red and white wires

from the solenoid valve. For FMD-2 disconnect

orange and white wires on the right solenoid or

the tan and white wires on the left solenoid. With

the “RINSE/RUN” switch in the "RINSE" upper

position press the dispense switch on front of

the door.

SOLENOID VALVE (DISPENSE) - FMD-1 & FMD-2

3. Check the voltage across the red and white,

orange and white or tan and white wires with a

voltmeter. Connect the dispenser to the power

source. The indication must be 120 volts ac for

twowire120voltmodels,threewire120/208and

120/240 volt models.

4. Disconnectthedispenserfromthepowersource.

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. Check for continuity across the solenoid valve

coil terminals.

FMD-1

P1665

If continuity is present as described, reconnect the

wires to the solenoid (see Fig. 34), proceed to #6

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 "RINSE/

RUN” switch in the "RINSE" upper position press

the 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 water outlet before the solenoid valve or,

the solenoid valve may require inspection for wear,

and removal of waterborne particles.

FMD-2

P1666

If the sound is not heard as described, replace the

solenoid valve.

FIG. 36 DISPENSE SOLENOID VALVE

Location:

The dispense solenoid is located on the upper

left center of the tank.

Removal and Replacement:

1. Open dispenser door and remove the hopper(s)

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

per panel to the auger motor mounting panel and

two #8-32 screws to the whipper mounting panel.

29112 101598

SOLENOID VALVE (INLET) - FMD-1 & FMD-2

SERVICE (cont.)

SOLENOID VALVE (DISPENSE) - FMD-1 & FMD-2

(cont.)

Remove panel and set aside.

3. Remove the two #8-32 securing the auger motor

mounting panel to the dispenser housing and the

two rear #8-32 screws from the side panels.

4. Tilt auger motor mounting panel forward allowing

access to the dispense valve(s).

5. Remove the wires from the solenoid valve.

6. Turn-off the water supply to the dispenser.

7. Drain enough water from the tank so the water

level is below the dispense valve mounting hole.

NOTE: Bunn-O-Matic has a syphon assembly,

#12440.0000. available for this purpose.

8. Disconnect the water line from the solenoid valve.

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

valve to side of the tank. Remove solenoid valve.

10. Usingthe #10-32screwinstallnewsolenoidvalve

on side of the tank

P1665

FIG. 37 INLET SOLENOID VALVE

Location:

The inlet solenoid is located on the lower right

side of the rear panel.

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

solenoid valve.

12. Refer to Fig. 34 and reconnect the wires.

13. Reassemble auger and hopper components.

Test Procedures:

1. Disconnect the dispenser from the power source.

2. Disconnect the white and violet wires from the

solenoid valve.

3. Checkthevoltageacrossthewhiteandvioletwires

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

and 120/240 volt models.

RED to Main Harness

WHI to Main Harness

FMD-1

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 dispenser wiring harness.

ORN to Main

Harness

5. Check for continuity across the solenoid valve coil

terminals.

WHI to Main

Harness

If continuity is present as described, reconnect the

white and violet wires to the solenoid.

If continuity is not present as described, replace the

solenoid valve.

RIGHT

TAN to Main Harness

LEFT

6. Check the solenoid valve for coil action. Connect

thedispensertothepowersource. Listencarefully

in the vicinity of the solenoid valve for a "clicking"

sound as the coil magnet attracts.

WHI to Main Harness

FMD-2

FIG. 34 DISPENSE SOLENOID VALVE

P1672

TERMINALS

29112 101598

TANK HEATER - FMD-1 (shown) & FMD-2

SERVICE (cont.)

SOLENOID VALVE (INLET) - FMD-1 & FMD-2

(cont.)

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

blockage 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 violet wires from the sole-

noid valve.

2. Turn-off the water supply to the dispenser.

3. Disconnect the water lines to and from the sole-

noid valve.

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

noid to the rear of the dispenser housing. Remove

solenoid.

5. Remove the two #8-32 U-Type fasteners from the

solenoid bracket.

6. Installthetwo#8-32U-Typefastenersandthetwo

#8-32 screws on the new solenoid.

7. Install new solenoid on rear of dispenser housing

and tighten the two screws

8. Securely fasten the water lines to and from the

solenoid valve.

P1665

FIG. 39 TANK HEATER

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. Checkthevoltageacrosstheblackandwhitewires

120voltmodelsorblackandredwiresfor120/208

volt modelsor120/240voltmodelswithavoltme-

ter. 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.

3. Disconnect the dispenser from the power source.

9.Refer to Fig. 38 and reconnect the wires.

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 har-

ness.

4. Disconnect the black wire and the white or red

wire from the tank heater terminals.

5. Check for continuity across the tank heater termi-

nals.

WHI from Main Harness

VIO from Main Harness

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.

P1217

FIG. 38 INLET SOLENOID VALVE TERMINALS

29112 101598

TANK HEATER SWITCH - FMD-1 (shown) & FMD-2

SERVICE (cont.)

TANK HEATER - FMD-1 (shown) & FMD-2 (cont.)

NOTE - If the tank heater remains unable to heat,

remove and inspect heater for cracks in the sheath.

Removal and Replacement:

1. Disconnect the dispenser from the power source.

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

3. Disconnect the black wires on the limit thermstat.

4. Disconnecttheblackwireandthewhiteorredwire

from the tank heater terminals.

5. Disconnect the pink wire from the liquid level

probe and the green wire from the tank.

6. Remove the thermostat capillary bulb by firmly

pulling-up on the capillary at the tank lid. This will

disengage the grommet from the tank lid.

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

the tank.

P1665

FIG. 41 TANK HEATER SWITCH

Location:

8. Remove tank lid with limit thermostat, liquid level

probe and tank heater as an assembly.

9. Remove the two hex nuts securing the tank heater

to the tank lid. Remove tank heater with gaskets

and discard.

10. Install new tank heater with gaskets on the tank lid

and secure with two hex nuts.

11. Install tank lid with limit thermostat, liquid level

probe and tank heater on the tank and secure with

ten #8-32 hex nuts.

12. Connect water inlet line to the tank lid.

13. 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 reconnecting wires.

The tank heater switch located inside the dis-

penser on the upper right of the front panel.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Disconnect the black wires from the main wiring

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 posi-

tion no continuity should be present between

center and upper terminals.

If continuity is present as described, the tank heater

“ON/OFF” switch is operating properly.

If continuity is not present as described, replace the

switch.

14. RefertoFig.40 whenreconnectingthewirestothe

tank heater.

Removal and Replacement:

1. Remove the switch mounting nut on the front of

the front panel.

BLK to Limit

Thermostat

WHI or RED to

Main Harness

2. Remove switch with wires attached from the rear

of the front panel.

3. Remove the wires from the switch terminals and

discard switch.

4. Connect the wires to the new switch, refer to Fig.

42.

5. Push new switch through hole in the front panel

and secure with facenut.

P1218

FIG. 40 TANK HEATER TERMINALS

29112 101598

SERVICE (cont.)

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.

BLK to Main

Harnesss

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.

BLK from Main

Harness

If voltage is present as described the transformer is

operating properly.

If voltage is not present as described, replace the

transformer.

FIG. 42 TANK HEATER SWITCH TERMINALS^P1219

TRANSFORMER - FMD-2 ONLY

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 dis-

penser far enough so the transformer connector

can be disconnected from the main wiring har-

ness.

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

transformer to the rear of the component bracket.

5. Remove and discard the transformer.

6. Install new transformer on the rear of the compo-

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

7. Connectthefourpinconnectoronthetransformer

to four pin plug on the main wiring harness.

8. Place the component bracket into position and

tighten the two #8-32 screws.

P1666

FIG. 43 TRANSFORMER

Location:

The transformer is located behind the lower

front access cover, mounted on the right rear side

of the component bracket.

WHI/GRN - T7

Test Procedure:

WHI/BLK - T12

1. Disconnect the dispenser from the power source.

2. Disconnect the four pin plug from the main har-

ness from the four pin connector on the trans-

former.

3 Check the voltage across black wire pin 1 and the

whitewirepin2ontheplugfromthemainharness.

Connect the dispenser to power source. The indi-

cation must be:

WHI - 120V T2, 240V T6

BLK - TI

FIG. 44 TRANSFORMER TERMINALS

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

b.120voltsforthreewire120/208voltmodelsand

three wire 120/240 volt models.

P1703

4. Disconnect the dispenser from the power source.

29112 101598

SCHEMATIC WIRING DIAGRAM FMD-1

GRN

CONTROL

THERMOSTAT

LIMIT

THERMOSTAT

HEATER

SWITCH

RED-16 (3-WIRE MODELS)

WHI-16 (2-WIRE MODELS)

TANK HEATER

BLK-16

WHI

BLK

FAN

TANK INLET

VIO

HOPPER SPEED ADJUST

WHI

SOL

LIQUID

LEVEL

BOARD

BLK

PNK

GRN

RUN/RINSE

SWITCH

PROBE

WHI

WHI/RED

RED

1 2

HOPPER

DRIVE

PCB

GRN

HOPPER

DISPENSE

WHIPPER

WHI

RED

WHI

RED

BLK

SOL

WHI

RED

BLK

FLUORESCENT

LAMP

BLU

BLK

DISPENSE SWITCH

BALLAST

BLK

RED

CHASSIS

GRN

DOOR

BLU

WHI

BLK

RED

BLK

120 VOLTS A C - 2 WIRE

120/208-240 VOLTS AC - 3WIRE

SINGLE PHASE

STARTER

BLK

WHI

29112 101598

SCHEMATIC WIRING DIAGRAM FMD-2

GRN

TANK HEATER

SWITCH

CONTROL

THERMOSTAT

LIMIT

THERMOSTAT

RED-16 (3-WIRE MODELS)

WHI-16 (2-WIRE MODELS)

TANK HEATER

BLK-16

BLK

FAN

WHI

WHI WHI

WHI

VIO

WHI

J4-1

J4-4

TANK INLET

VIO

SOL

WHI

BLK

WHI/BLK

WHI/GRN

WHI

WHI/BLK

WHI/GRN

WHI

120V : 24V AC

TRANSFORMER

BLK

WHI/BLK

WHI/GRN

WHI

J3-1

WHI/ORN

WHI/RED

GRN

BLK

GRN

WHI/GRN

WHI/BLK

J3-6

J2-1

BRN/BLK

GRY

YEL

WHI/ORN

WHI/YEL

RED/BLK

WHI/RED

GRN

PNK

WHI

BLK

J2-5

RINSE/PROGRAM/

RUN SWITCH

GRN

GRY

RUN

GRN

BLK

J2-10

PGM

FLUORESCENT

LAMP

BALLAST

INCREASE/

DECREASE

SWITCH

BLK BLK

YEL

WHI/BRN

RINSE

RUN

GRN

PGM

RINSE

BRN/BLK

RED/BLK

WHI/BRN

PROBE

GRN

RIGHT HOPPER

RIGHT DISPENSE

RIGHT WHIPPER

WHI/ORN

ORN

RED

BLK

WHI

GRN

SOL

LEFT DISPENSE

LEFT WHIPPER

LEFT HOPPER

WHI/RED

TAN

RED

WHI

RED

WHI

BLK

SOL

ORN

COLD DRINK OPTION (LEFT ONLY)

RED

BLU

WHI

RED

TAN

WHI

SOL

JUMPER PLUG MUST BE

USED WHEN COLD

DRINK FEATURE NOT

INSTALLED

WHI

CHASSIS

120 VOLTS AC - 2 WIRE

120/208-240 VOLTS AC - 3 WIRE

SINGLE PHASE, 60 HZ

GRY

GRN/BLK

WHI/BLK

DOOR

29096.0001C 10/98

1998 BUNN-O-MATIC CORPORATION

PNK

"RINSE" L.E.D.

WHI

BLU

WHI

RED

BLK

STARTER

BLK

ORN

BLK

ORN

BLK

BLK/WHI

RED/WHI

BLU/WHI

RED

BLK

WHI

LEFT DISPENSE SWITCH

RIGHT DISPENSE SWITCH

29112 101598

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