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19

SERVICE (cont.)

AUXILIARY CONTROL BOARD

FIG. 5 AUXILIARY CONTROL

BOARD

P1646

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. Disconnect the three pin connector from J1 of the

auxiliary control board.

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

ing bracket as a reference (-), check for voltage at
pin 1 (red wire) of J1. Connect the dispenser to the
power source. The indication must be approxi-
mately 37 volts dc.

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 harness.

5. Reconnect the three pin connector of the wiring

harness to J1 of the auxiliary control board.

6. Disconnect the six pin connector from J2 of the

auxiliary control board.

7. Check the voltage across pins 2 (black wire) and 5

(white wire) of the six pin 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.

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. 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.

10. Disconnect the dispenser from the power source.

If voltage is present as described the hot water dis-
pense 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. Disconnect the three pin connector from J1 of the

auxiliary control board.

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

ing bracket as a reference (-), check for voltage at
pin 1 (red wire) of J1. Connect the dispenser to the
power source. The indication must be approxi-
mately 37 volts dc.

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 harness.

29215 052104

Summary of Contents for FMD DBC-3

Page 1: ...MANUAL BUNN O MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD ILLINOIS 62708 3227 PHONE 217 529 6601 FAX 217 529 6644 www bunn com 29215 0000F 01 06 1998 Bunn O Matic Corporation FMD DBC 3 FMDA DBC 3 SN FMD0013000 UP ...

Page 2: ...m BUNN that the defective equipment is under warranty THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY WRITTEN OR ORAL EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE The agents dealers or employees of BUNN are not authorized to make modifications to this warranty or to make additional warran...

Page 3: ...USING THIS PRODUCT THIS APPLIANCE IS HEATED WHENEVER CONNECTED TO A POWER SOURCE 00831 0000F 3 98 1998 BUNN O MATIC CORPORATION This equipment must be installed to comply with the Basic Plumbing Code of the Building Officials and Code Administrators International Inc BOCA and the Food Service Sanitation Manual of the Food and Drug Administration FDA For models installed outside the U S A comply wi...

Page 4: ...wer 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 from a 1 2 or larger supply line A shut off valve should be installed in the line before the dispenser Install a regulator in the line when pressure is greater than 90 psi to reduce it to 5...

Page 5: ...or has been investigated see the troubleshooting guide and cured the system can be reset by either disconnecting for at least 5 seconds and then reconnecting the power to the machine or by entering one of the program modes see Programming Modes RINSE TIMER The dispenser is shipped from the factory with the rinse timer disabled To enable the rinse timer remove power from the dispenser remove the lo...

Page 6: ...r Exit a To enter the program mode press any two dispense size switches on the position to be programmed at the same time The L E D will flash indicating the program mode b To exit the program mode press a switch on any position other than the one being programmed Note The stop switch will not cause exit of program mode since it is used for some programming operations If in the program mode for mo...

Page 7: ...d to the proper hopper dispense rate you can make all 3 positions approximately the same as follows a Place the Rinse Run switch in the Rinse position b Enter the program mode on the position you want all others to be like see step 1 a c Press and hold the Stop switch for 10 seconds d After the 10 second period all 3 position L E D s will come on solid indicating the task is complete The program m...

Page 8: ...ft whipper chamber in the COLD upper position CLEANING Refer to the decal inside the hopper access door for cleaning recommendations and procedures The use of a damp cloth rinsed in any mild non abrasive liquid detergent is recommended for cleaning all surfaces on Bunn O Matic equipment ADJUSTMENTS The hot or cold beverage solenoids are preset to dispense approximately 9 10 ounce per second This a...

Page 9: ...oid 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 protec...

Page 10: ...ent part 29329 1000 REMEDY Refer to Service Dispense Solenoid Valve for testing proce dures See page 35 or 36 Refer to Service Solenoid Valve Inlet for testing procedures See page 38 Refer to Service Control Board and Probe for testing proce dures See page 22 Refer to Service Overflow Protection Switch for testing procedures See page 33 Refer to Service Auger Drive See page 15 A Direction of flow ...

Page 11: ...initiate corrosive reactions result ing in serious leaks 2 Dispense Solenoid Valve Hot or Cold 1 Control Board 2 Solenoid Valve Inlet REMEDY Refer to Service Control Thermo stat for testing procedures See page 24 Refer to Service Tank Heater for testing procedures See page 39 Refer to Service Tank Heater Switch for testing procedures See page 40 Inspect tank assembly for exces sive lime deposits D...

Page 12: ... necessary See page 35 or 36 Refer to Dispense Run Time on page 6 Place an empty container beneath the dispense tip Initiate a dispense cycle and check the water tempera tureimmediatelybelowthedispense tip with a thermometer A Reading for mechanical thermo statmodelsshouldbe180 Fto200 F seethermostattemperaturesettings decal in USER NOTICES on page 3 B Reading for electronic thermo stat should be ...

Page 13: ...sure to the dispenser must not exceed 90 psi Install a regulator if necessary to lower the working pressure to approximately 50 psi Remove and clean lime off the tank heater See page 39 Refer to Service Fan for testing procedures See page 28 Refer to Service Control Board for testing procedures See page 22 Refer to Service Lamp see page 32 for lamp replacement Refer to Service Lamp Holder for test...

Page 14: ...s See page 37 Refer to Service Digital touch con trol switch for testing procedures See page 26 Refer to Service Auxiliary control board for testing procedures See page 19 RefertoService Tankheaterswitch for testing procedures See page 40 Refer to Service Control thermo stat for testing procedures See page 24 Refer to Service Digital touch con trol switch for testing procedures See page 26 Refer t...

Page 15: ...Switch 30 Lamp Holder 31 Lamp 32 Lamp Starter and Socket 32 Limit Thermostat 33 Overflow Protection Switch 33 Rinse Run Switch 34 Solenoid Cold Drink Optional 35 Solenoid Dispense 36 Solenoid Hot Water Optional 37 Solenoid Inlet 38 Tank Heater 39 Tank Heater Switch 40 Transformer 41 Whipper Motor 28 Wiring Diagrams 43 FIG 1 AUGER DRIVE COMPONENTS Location The auger components are located inside th...

Page 16: ...e 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 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 i...

Page 17: ...out on the side of the hopper rotating the agitator disk assy out of the mounting hubs and lifting the agi tator disk assy from the hopper Remove the mix ing blades 4 from the agitator disk by tugging sharply 6 Remove auger 9 by pulling it out the front of the hopper 8 7 Remove the auger drive bracket by turning it clock wise whilde holding the auger drive shaft firmly 8 Slide auger drive shaft 5 ...

Page 18: ...ove 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 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 mou...

Page 19: ... 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 Check the voltage across the terminals of the hot waterdispensesolenoidwithavoltmeter Connect the dispenser to the power...

Page 20: ...ence check for voltage in turn at pin 3 and pin 6 of the six pin connector of 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 10 Disconnect the dispenser from the power so...

Page 21: ...ty 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 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 Install new ballast using two 8 32 screws to se c...

Page 22: ...30 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 six pin connector of the wiring harness to J2 of the control board 10 Disconnect the eight pin connector from J1 of the control board 11 Carefully connect a pie...

Page 23: ... The indication must be 24 volts ac 4 Disconnect the dispenser from the power source SERVICE cont CONTROL BOARD cont 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 eight pin connector of the wiring harness to J1 of the control board 6 Check that the Rinse Run switch is i...

Page 24: ...ank If voltage is not present as described replace the thermostat P1682 40 J3 J2 J1 J4 J1 FIG 10 CONTROL BOARD CONNECTORS P1680 If the voltage is present as described the whipper motor and dispense solenoid control circuitry is oper ating 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...

Page 25: ...ermostat 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 6A Mechanical thermostat only Slide the grommet to the line 4 5 above the bulb on the new capillary tube 6B Electronic thermostat only Slide the grommet to the bottom of the grounding clip on the wired end of the probe 7 In...

Page 26: ...7 Right Medium pin 7 to pin 8 Right Large pin 1 to pin 8 Hot Water pin 1 to pin 13 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 SERVICE cont DIGITAL TOUCH CONTROL SWITCH P1631 Location The digital touch control switch is located on the lower outside of the dispenser door Test ...

Page 27: ...ect wiring harness 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 har...

Page 28: ...ws securing the fan to the dispenser housing base plate 3 Disconnect the wires from the fan terminals and discard the fan 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 SERVICE cont BLK from Main Wiring Harness WHI from Main Wiri...

Page 29: ...otor shaft 13 Remove the two nuts 7 securing whipper motor 10 to the front panel 14 Disconnect the black leads on the motor 10 from the main wiring harness 15 Remove motor and discard 16 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 18 when reconnecting wires 17 Slide slinger 9 onto the motor shaf...

Page 30: ...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 sc...

Page 31: ...wer Panel 6 Starter W Socket 5 2 SERVICE cont 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 di...

Page 32: ...or 6 Install outside window and slide display graphic down between the inside window and the outside window LAMP HOLDER 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 start...

Page 33: ...HERMOSTAT FIG 23 LIMIT THERMOSTAT P1682 40 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 If continuity is present as described the limit thermo stat is operating properly If continuity is not ...

Page 34: ...necting wires FIG 26 OVERFLOW PROTECTION SWITCH LEADS P1212 RED to BLU Lead from Main Harness RINSE RUN SWITCH FIG 27 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 blue and green wires from the switch terminals 3 With the switch in the R...

Page 35: ...er 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...

Page 36: ...h on front of the door The indica tion 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 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 wiring diagram ...

Page 37: ...NSE cont HOTWATERDISPENSESOLENOIDVALVE Optional Location The hot water solenoid valve is located on the left side of the tank P1682 FIG 33 HOT WATER DISPENSE SOLENOID VALVE Test Procedures 1 Disconnect the dispenser from the power source 2 With a voltmeter check the voltage across the whiteandbluewiresatthesolenoidvalve Connect the dispenser to the power source The indication must be a 120 volts a...

Page 38: ...ve for coil action Connect thedispensertothepowersource Listencarefully 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 blockage in the water line before the solenoid valve or the solenoid valve may require insp...

Page 39: ... 36 INLET SOLENOID VALVE TERMINALS TANK HEATER FIG 37 TANK HEATER P1682 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 240voltmodels Connectthedispe...

Page 40: ...he 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 discard 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 a...

Page 41: ...hopper support plate and the hopper assemblies FIG 40 TANK HEATER SWITCH TERMINALS P1219 TANK HEATER SWITCH cont BLK from Main Harness Mechanical Thermostat WHI BRN from Main Harness Electronic Thermostat BLK from Main Harness Mechanical Thermostat WHI BRN from Main Harness Electronic Thermostat TRANSFORMER FIG 41 TRANSFORMER P1646 Location The transformer is located behind the lower front access ...

Page 42: ...e 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 ...

Page 43: ...43 29215 101598 ...

Page 44: ...44 29215 101598 ...

Page 45: ...45 29215 031500 ...

Page 46: ...RINK OPTION LEFT ONLY SOL SOL SOL LEFT CENTER RIGHT READY HOT WATER STOP S M M D L G S M M D L G S M M D L G AUX CONTROL PC BOARD SWITCH UNIT ASSY RIGHT DISPENSE 240V 24V AC TRANSFORMER PROBE CONTROL THERMOSTAT LIMIT THERMOSTAT TANK 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 CEN...

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