BUNN ® FMD-2 FMD-3 (prior to S/N FMD0013000) d an SH PU A ! W RN ING TD HOU I LI RE LE AS EB UT TO N Q W TIL UN ON TT BU LD HO N HE CU P IS 2/3 FU P IS CU 2/3 SE EA EL NR HE ,T LL FU LL E AC E PL HER P CU E AC E PL HER P CU E AC E PL HER P CU OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 28364.0000D 08/02 ©1998 Bunn-O-Matic Corporation www.bunnomatic.
INTRODUCTION This equipment dispenses hot beverages on demand from powdered product. It has two or three hoppers. The two and three hopper models may also dispense cold beverages from powdered product from their left dispense station. It is for indoor use only on a sturdy counter or shelf. BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows: 1) All equipment other than as specified below: 2 years parts and 1 year labor.
USER NOTICES (cont.) 00656.0000 00831.0000 160° + 190° TEMPERATURE ADJUSTMENT HEATER 26527.0002 THERMOSTAT ASSEMBLY BUNN-O-MATIC CORP 120VAC MECHANICAL THERMOSTAT 28368.0000 ® ELECTRONIC THERMOSTAT 26536.0002 RELEASE BUTTON WHEN CUP IS 2/3 FULL PLACE CUP HERE PLACE CUP HERE FMD-2 28328.00003 FMD-3 28328.
INITIAL SET-UP 1. 2. 3. 4. Locate the drip tray assembly beneath the dispenser nested in the packing material. Remove the drip tray and the drip tray cover and set them aside. Remove the water strainer assembly from the drip tray and set it aside. Remove the four legs from the drip tray, apply non-skid pads to the bottom of the legs and securely install the legs in the dispenser base.
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. INITIAL FILL & HEAT CAUTION - The dispenser must be disconnected from the power source throughout the initial fill & heat, except when specified in the instructions. 1. 2.
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.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Product will not dispense 1. No water Water lines and valves to the dispenser must be open. 2. No power or incorrect voltage to the dispenser (A1) Check for 120 volts across the black and white wires on two wire 120 volt dispenser. (A2) Check for 120 volts across the red and white wires and the black and white wires on three wire 120/ 240 volt dispenser. (A3) Check for 240 volts across the white and black wires on two wire 240 volt dispenser.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Product will not dispense (cont.) 9. Water strainer (A) Direction of flow arrow must be pointing towards dispenser. (B) Remove the strainer and check for obstructions. Clear or replace. Water is not hot Spitting or excessive steaming 10. Lime build-up CAUTION - Tank and tank components should be delimed regularly depending on local water conditions.
TROUBLESHOOTING (cont.) PROBLEM Dripping from dispense tip Water flows into tank continuously Product overflows container PROBABLE CAUSE REMEDY 1. Lime build-up CAUTION - Tank and tank components should be delimed regularly depending on local water conditions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks. Inspect the tank assembly for excessive lime deposits. Delime as required. 2.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Weak product 1. Water temperature Place an empty container beneath the dispense tip. Initiate a dispense cycle and check the water temperature immediately below the dispense tip with a thermometer. (A) Reading for mechanical thermostat models should be 180°F to 200°F (see thermostat temperature settings decal in USER NOTICES on page 3. (B) Reading for electronic thermostat should be185°F to 190°F.
TROUBLESHOOTING (CONT.) PROBLEM PROBABLE CAUSE REMEDY Dispenser is making unusual noises 1. Plumbing Lines Plumbing lines should not be resting on the counter top. 2. Water Supply (A) The dispenser must be connected to a cold water line (B) Water pressure to the dispenser must not exceed 90 psi 620 kPa). Install a regulator if necessary to lower the working pressure to approximately 50 psi (345 kPa). Excess dust Display not lit 3. Tank Heater Remove and clean lime off the tank heater.
AUGER DRIVE COMPONENTS SERVICE This section provides procedures for testing and replacing various major components used in this dispenser should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any problem. WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.
SERVICE AUGER DRIVE COMPONENTS (CONT.) 4. Disconnect the dispenser from the power supply. 1 2 If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the wiring diagrams and check the dispenser wiring harness. 3 5 5. 4 11 6 13 With the wires removed from the motor to be tested. Check for continuity across the two terminals on the bottom of the auger motor.
(17) to the rear of the auger motor mounting panel (15). 4. Disconnect the wires from the auger motor (17) to be removed. 5. Remove auger motor mounting bracket (16), auger motor (17) and dust seal (18) as an assembly. 6. Remove dust seal (18) from auger motor (17). 7. 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 screw install new auger motor (17) on mounting bracket (16). 10.
If voltage is not present as described, replace the ballast. SERVICE (cont.) BALLAST Removal and Replacement 1. Disconnect the wires from the ballast. 2. Remove the one #8-32 screw securing the ballast to the component bracket. 3. Remove and discard ballast. 4. Install new ballast over the weld pin on the component bracket and secure with one #8-32 screw. 5. Refer to Fig. 5 when reconnecting the wires. BLK to Main Wiring Harness BLK to BLU from Door Interconnect Harness FIG.
If voltage is present as described the control thermostat is operating properly. Reinstall bulb into the tank. If voltage is not present as described, replace the thermostat. SERVICE (cont.) CONTROL THERMOSTAT Electronic Thermostat (Optional) 1. Disconnect the dispenser from the power source. 2. Disconnect the black wire of the control thermostat from the black wire from the limit thermostat. 3. Remove temperature probe from the tank. 4.
SERVICE (cont.) 11. Refer to Fig. 7 and reconnect the wires. CONTROL THERMOSTAT (cont.) NOTE - The capillary tube must be clear of any electrical termination and not kinked. 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.
FAN SERVICE (cont.) DISPENSE SWITCH (cont.) 6. Check for continuity across the terminals on the dispense switch 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. Removal and Replacement 1. Open the dispenser door. 2.
SERVICE (cont.) 3. Press and hold the appropriate 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. c) 240 volts ac for two wire 240 volt models. 4. Disconnect the dispenser from the power source. FAN (cont.) 6. Reconnect the vacuum hose to the fan.
19. Wash remaining components in a mild solution of dish detergent using a bristle brush. 20. Rinse thoroughly and allow to dry before reinstalling in the dispenser. 21. Place teflon washer into back opening of whipper chamber receptical and align one notch with bump in the opening. 22. Slide whipper chamber receptacle w/seal on to the motor shaft and secure to the front panel using two #6-32 screws (7). 23. Slip o-ring (5) onto the whipper chamber receptical (8). 24.
SERVICE (cont.) Test Procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect the eight pin plug on the main wiring harness from the eight pin connector on the hopper delay board. 3. With the rinse/run switch in the “Run”, lower position, check the voltage across the white and black wires of the main 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.
SERVICE (cont.) If voltage is present as described, reconnect the four pin plugs and proceed to #5. If voltage is not present as described, refer to the wiring diagram and check the main wiring harness. HOT/COLD SWITCH (Optional) 5. 6. Disconnect the wires from the switch terminals. With the switch in the upper “Cold” position check for continuity between the center terminal and the bottom terminal.
Removal and Replacement: 1. Open dispenser door (1). 2. Remove the five #6-32 screws securing lower door panel (5) to the door (1) and remove cover. 3. Disconnect the door wiring harness from the door interconnect wiring harness. 4. Remove five #6-32 screws securing the upper door panel (4) to the door. 5. Remove the upper door cover (4), lamp (3), lamp holders (2) and door wiring harness as an assembly. 6. Disconnect the wires from the lamp holder to be replaced from the door wiring harness. 7.
9. Connect the sockets leads to the door wiring harness. 10. Install door lower panel (5) with starter and starter socket on door assy (1) using five #6-32 screws. SERVICE (cont.) LAMP STARTER and SOCKET Location: The lamp starter (6) is located inside the door assy (1) on the top of the door lower panel (5). LEVEL CONTROL BOARD AND LEVEL PROBE Test Procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect the starter leads from the door wiring harness. 3.
16. Move the probe's flat end away from the dispenser housing. 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 and 240 volt ac for two wire 240 volt models after a delay of approximately 5 seconds. SERVICE (cont.) LEVEL CONTROL BOARD AND LEVEL PROBE (cont.) If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring haness.
Removal and Replacement: 1. Remove all wires from the limit thermostat terminals. 2. Carefully slide the limit thermostat out from under the retaining clip and remove the limit thermostat. 3. Carefully slide the new limit thermostat into the retaining clip. 4. Refer to Fig. 21 when reconnecting the wires. SERVICE (cont.) LIMIT THERMOSTAT BLK to Tank Heater BLK to Control Thermostat P1800 FIG. 21 LIMIT THERMOSTAT TERMINALS FIG.
Removal and Replacement: 1. Disconnect the red leads from the overflow protection switch from the black wire from the main harness and the blue wire from the liquid level board. 2. Remove the nut beneath the copper overflow cup. 3. Remove the entire switch assembly from the cup. 4. Place the new switch assembly into the cup, wires first. Make sure that a gasket is in place around the threaded switch stem. SERVICE (cont.
3. SERVICE (cont.) RINSE /RUN SWITCH 4. 5. 6. Remove switch with wires attached from the back side of the whipper motor mounting panel. Disconnect the wires from the switch and discard the switch. Refer to Fig. 25 when connecting the wires to the new switch. Install new switch with wires attached through the hole in the whipper motor mounting panel and secure with facenut. BLK to Main Wiring Harness BLK from Hopper Delay Board #4 P1456 FIG. 25 RINSE/RUN SWITCH TERMINALS FIG. 24 RINSE/RUN SWITCH P1452.
If voltage is not present as described, refer to wiring diagram and check dispenser wiring harness. SERVICE (cont.) SOLENOID VALVE (COLD WATER - OPTIONAL) 5. Check for continuity across the solenoid valve coil terminals. If continuity is present as described, reconnect the white and white/yellow wires to the solenoid. If continuity is not present as described, replace the solenoid valve. 6. 7. Check the solenoid valve for coil action. Connect the dispenser to the power source.
Test Procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect the white and white/violet, orange or tan wires from the solenoid valve. With the “RUN/ RINSE” switch in the "RINSE" upper position press the appropriate dispense switch on front of the door. 3. Check the voltage across the white and white/ violet, orange or tan wires with a voltmeter. Connect the dispenser to the power source.
SERVICE (cont.) SOLENOID VALVE (INLET) SOLENOID VALVES (DISPENSE) (cont.) 3. Drain enough water from the tank (approximately 1.0 gallon) 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. 4. Disconnect the water line from the solenoid valve. 5. Remove the #10-32 screw securing the solenoid valve to side of the tank. Remove solenoid valve. 6. Using the #10-32 screw install new solenoid valve on side of the tank 7.
SERVICE (cont.) TANK HEATER SOLENOID VALVE (INLET) (cont.) 7. fully in the vicinity of the solenoid valve for a "clicking" sound as the coil magnet attracts. 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.
SERVICE (cont.) WHI or RED to Main Wiring Harness TANK HEATER (cont.) BLK to Limit Thermostat 5. Check for continuity across the tank heater terminals. If continuity is present as described, reconnect the wires, the tank heater is operating properly. If continuity is not present as described, replace the tank heater. NOTE - If the tank heater remains unable to heat, remove and inspect heater for cracks in the sheath. Removal and Replacement: 1. Shut-off water supply to the dispenser. 2.
SERVICE (cont.) TANK HEATER SWITCH (cont.) Test Procedure: 1. Disconnect the dispenser from the power source. 2. Disconnect the black wire from the power supply and the black wire from the control thermostat. 3. With the switch in the “ON” lower position check for continuity between the center and the upper terminal. With the switch in the “OFF” upper position no continuity should be present between center and upper terminals.
SCHEMATIC WIRING DIAGRAM FMD-1, FMD-2, & FMD-3 GRN L1 L2 N ELECTROMECHANICAL THERMOSTAT CONFIGURATION HEATER SW. One Configuration MUST be used! BLK-16 BLK-16 LIMIT THERMOSTAT THERMOSTAT BLK-16 BLK-16 RED-16 (3-WIRE MODELS) TANK HEATER WHI-16 (2-WIRE MODELS) ELECTRONIC THERMOSTAT CONFIGURATION HEATER SW WHI/BRN WHI/BRN TAN BLK-16 ELECTRONIC THERMOSTAT ASSY.
SCHEMATIC WIRING DIAGRAM FMDA-1, FMDA-2, & FMDA-3 GRN L1 HEATER SW.
