Bunn HC-3 manual

B UNN ® OPERA TING & SERVICE MANUAL BUNN-O-MA TIC CORPORA TION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 F AX: (217) 529-6644 27591.0000 6/00 ©1996 Bunn-O-Matic Corporation HC-2 HC-3 (SERIAL # HC00025000 - UP) DISCONTINUED VERSION The information in this manual is no longer current.[...]

2 INTRODUCTION This equipment dispenses hot beverages on demand from powered 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. WARRANTY Bunn-O-Matic Corp. (“Bunn”) warrants the equi[...]

3 00656.0000 00831.0000 11646.0000 12368.0002 26525.0000 27620.0000 USER NOTICES Carefully read and follow all notices on the equipment and in this manual. They were written for your protection. All notices are to be kept in good condition. Replace any unreadable or damaged labels. 27591 061500[...]

4 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 drip tray, apply non-skid pads to the bottom of the legs and securely [...]

5 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[...]

6 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 remo[...]

7 PROBLEM Product will not dispense PROBABLE CAUSE 1. No water 2. No power or incorrect voltage to the dispenser 3. Dispense switch 4. Dispense solenoid valve (Hot or Cold) 5. Solenoid valve (Inlet) 6. Level control board and probe 7. Overflow protection switch 8. Auger drive REMEDY Water lines and valves to the dispenser must be open. (A1) Check t[...]

8 TROUBLESHOOTING (cont.) PROBLEM Product will not dispense (cont.) Water is not hot Spitting or excessive steaming PROBABLE CAUSE 9. Water strainer 10. Lime build-up CAUTION - Tank and tank compo- nents should be delimed regularly depending on local water condi- tions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive r[...]

9 TROUBLESHOOTING (cont.) PROBLEM Dripping from dispense tip Water flows into tank continuously PROBABLE CAUSE 1. Lime build-up CAUTION - Tank and tank compo- nents should be delimed regularly depending on local water condi- tions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions result- ing in serious leaks. [...]

10 TROUBLESHOOTING (cont.) PROBLEM Product overflows container Weak product PROBABLE CAUSE 1. Dispense switch 2. Dispense solenoid valve (Hot or Cold) 1. Water temperature 2. Whipper motor 3. Frother 4. Dispense solenoid valve (Hot or Cold) 5. Auger drive 6. Auger spring 7. Auger motor REMEDY Refer to Service - Dispense Switch for testing procedure[...]

11 TROUBLESHOOTING (CONT.) PROBLEM Dispenser is making unusual noises Excess dust Display not lit PROBABLE CAUSE 1. Plumbing Lines 2. Water Supply 3. Tank Heater 1. Fan 2. Hopper Delay Board 3. Transformer (240V 2 Wire Models Only) 1. Lamp 2. Lamp Holder 3. Starter - Lamp 4. Ballast REMEDY Plumbing lines should not be rest- ing on the counter top. [...]

12 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 electri- cal equipment should be performed only by qualified service pers[...]

13 SERVICE AUGER DRIVE COMPONENTS (cont.) If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the wir- ing diagrams and check the dispenser wiring harness. 5. With the wires removed from the motor to be tested. Check for continuity across the two ter- minals on the bottom of the auger motor. If contin[...]

14 SERVICE (cont.) AUGER DRIVE COMPONENTS (cont.) 14. Install hopper assy (21) in the dispenser by slid- ing hopper assy in the guides on the hopper sup- port plate (20) until the slot in the bottom rear the hopper seats against the shoulder screw (19) in the hopper support plate. Auger Drive Motor (Refer to Fig. 2) 1. Disconnect the wires from the[...]

15 SERVICE (cont.) BALLAST FIG. 4 BALLAST Location The front door lamp ballast is located on the front center of the base behind the front panel. Test Procedure 1. Disconnect the dispenser from the power source. 2. Disconnect the two terminal plug of the door in- terconnect harness from the connector of the ballast. 3. Check the voltage across the [...]

16 SERVICE (cont.) CONTROL THERMOSTAT MECHANICAL ELECTRONIC (OPTIONAL) FIG. 6 CONTROL THERMOSTAT P1199.45 P1203.45 Location Mechanical Thermostat The mechanical thermostat is located on the upper right side of the rear panel inside the dispenser. Electronic Thermostat (Optional) The electronic thermostat is located on the right front side of the ba[...]

17 SERVICE (cont.) CONTROL THERMOSTAT (cont.) Removal and Replacement. Mechanical Thermostat 1. Disconnect the wires from the thermostat. 2. 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. 3. Remove the #8-32 screw securing the thermo- stat to the rear pa[...]

18 SERVICE (cont.) DISPENSE SWITCH P1196.70 Location: The dispense switches are located on the lower outside of the dispenser door. NOTE : The center dispense switch is for HC-3 Models only. Test Procedure: 1. Disconnect the dispenser from the power source. 2. Open the dispenser door and remove the bottom door cover. 3. Disconnect the connector of [...]

19 SERVICE (cont.) FAN FIG. 10 FAN P1199.45 Location: The fan is located inside the front panel, mounted on a plate beneath the hopper mounting plate. Test Procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect the black and white wires from the black leads on the fan. 3. Check the voltage across the black and white wires on t[...]

20 SERVICE (cont.) FROTHER AND WHIPPER MOTOR FIG. 11 FROTHER AND WHIPPER MOTOR P1203.45 Location: The frothers are located behind the dispenser door, mounted on the front of the front panel inside the whipper chamber. The whipper motors are located on the back side of the front section of the front panel. NOTE: The center position is for HC-3 Model[...]

21 SERVICE (cont.) FROTHER AND WHIPPER MOTOR (cont.) 4. Remove dispense tip (3) and twist the whipper chamber (4) clockwise and pull it off the whipper chamber receptacle (8). 5. 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 whe[...]

22 SERVICE (cont.) HOPPER DELAY BOARD FIG. 13 HOPPER DELAY BOARD P1199.45 Location The hopper delay board is located on the left front side of the dispenser base just behind the front panel. Test Procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect the white and black wires of the hopper delay board harness from the main wir[...]

23 SERVICE (cont.) FIG. 14 HOT/COLD SWITCH P1199.45 HOT/COLD SWITCH (Optional) Location: The hot/cold switch is located on the left side of the front panel. Test Procedure: 1. Disconnect the dispenser from the power source. 2. Disconnect the four pin plug from the hot/cold switch and the four pin connector on the main wiring harness. 3. Press the l[...]

24 SERVICE (cont.) LAMP HOLDER FIG. 16 LAMP HOLDERS P1209.75 Location: The lamp holders are located on the front of the reflector behind the display panel. Test Procedure: 1. Disconnect the dispenser from the power source. 2. Disconnect the plugs on the door wiring harness from the connectors on the lamp holders. 3. Remove lamp from lamp holders. 4[...]

25 SERVICE (cont.) LAMP STARTER and SOCKET (120V, 120/208V & 120/240V Models Only) Location: The lamp starter (6) is located inside the door assy (1) on the top of the door bottom cover (5). Test Procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect the plug on the starter leads from the connector on the door wiring harne[...]

26 SERVICE (cont.) LEVEL CONTROL BOARD AND LEVEL PROBE FIG. 17 LEVEL CONTROL BOARD AND PROBE P1203.45 Location: The level control board is located on the upper right rear of the front panel just in front of the tank. The Level probe is located on the right center of the tank lid. Test Procedure: 1. Disconnect the dispenser from the power source. 2.[...]

27 SERVICE (cont.) LEVEL CONTROL BOARD AND LEVEL PROBE (cont.) If voltage is present as described, reinstall the probe, the level control board and level probe are operating properly. If voltage is not present as described, check the pink probe wire for continuity. Removal and Replacement: 1. Remove all wires from the level control board. 2. Remove[...]

28 SERVICE (cont.) OVERFLOW PROTECTION SWITCH FIG. 21 OVERFLOW PROTECTION SWITCH P1199.45 Location: The overflow protection switch is located in- side the copper overflow cup on the upper front of the tank. Test Procedures: 1. Disconnect the dispenser from the power source. 2. Remove the wire nuts connecting the red wires from the overflow protecti[...]

29 SERVICE (cont.) RUN/RINSE SWITCH FIG. 23 RUN/RINSE SWITCH P1199.45 Location: The run/rinse switch is located on the right side of the front panel. Test Procedures: 1. Disconnect the dispenser from the power source. 2. Check for continuity between center terminals and the upper terminals with the switch in the “ RUN ” lower position. Continui[...]

30 SERVICE (cont.) SOLENOID VALVE (COLD WATER - OPTIONAL) FIG. 25 COLD WATER SOLENOID VALVE P1214.45 Location: The cold water solenoid valve is located on the left side of the dispenser base just behind the hop- per delay board. Test Procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect the white and white/yellow wires from t[...]

31 SERVICE (cont.) SOLENOID VALVE (COLD WATER - OPTIONAL) (cont.) FIG. 26 COLD WATER SOLENOID TERMINALS P1215 SOLENOID VALVES (DISPENSE) FIG. 27 DISPENSE SOLENOID VALVES P1203.45 Location: The dispense solenoids are located on the upper right side of the tank. Test Procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect the whi[...]

32 SERVICE (cont.) SOLENOID VALVES (DISPENSE) (cont.) 3. 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. 4. Disconnect the water line from the solenoid valve. 5. Remove the #10-32 screw securing the solenoid valve to sid[...]

33 SERVICE (cont.) SOLENOID VALVE (INLET) (cont.) If continuity is not present as described, replace the solenoid valve. 6. Check the solenoid valve for coil action. Connect the dispenser to the power source. Listen care- fully in the vicinity of the solenoid valve for a "clicking" sound as the coil magnet attracts. 7. Disconnect the disp[...]

34 P1199.35 SERVICE (cont.) TANK HEATER (cont.) 5. Check for continuity across the tank heater termi- nals. 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[...]

35 SERVICE (cont.) Test Procedure: 1. Disconnect the dispenser from the power source. 2. Disconnect the black wire and the blue/black wire on electro/mechanical thermostats or the tan wires on electronic thermostats. 3. With the switch in the “ ON ” lower position check for continuity between the center and the upper terminal. With the switch i[...]

36 TRANSFORMER (240V TWO WIRE MODELSONLY)(cont.) 1 2 3 FIG.34 TRANSFORMER TERMINALS P1288 BLK & WHI to Fan RED & BLK to Main Harness SERVICE (cont.) Removal and Replacement: 1. Disconnect the wires from the transformer. 2. Remove the two #8-32 keps nuts securing the transformer to the dispenser base. 3. Remove and discard the transformer. 4[...]

37 BLK RED/WHI SOL DISPENSE M WHIPPER M HOPPER RUN/RINSE SWITCH WHI/GRN WHI WHI/BLK WHI WHI WHI/RED WHI/RED WHI WHI/RED SOL LEFT DISPENSE M RIGHT WHIPPER M RIGHT HOPPER SOL RIGHT DISPENSE M LEFT WHIPPER M LEFT HOPPER M CENTER HOPPER M CENTER WHIPPER SOL CENTER DISPENSE WHI/GRN WHI/GRN WHI WHI/BLK WHI/BLK WHI/BLK WHI/VIO WHI/VIO WHI/VIO WHI WHI WHI [...]

38 WHI BLK BLK BLU BLU RED/WHI SOL DISPENSE M WHIPPER M HOPPER RUN/RINSE SWITCH WHI/GRN WHI WHI/BLK WHI WHI WHI/RED WHI/RED WHI WHI/RED SOL LEFT DISPENSE M RIGHT WHIPPER M RIGHT HOPPER SOL RIGHT DISPENSE M LEFT WHIPPER M LEFT HOPPER M CENTER HOPPER M CENTER WHIPPER SOL CENTER DISPENSE WHI/GRN WHI/GRN WHI WHI/BLK WHI/BLK WHI/BLK WHI/VIO WHI/VIO WHI/[...]