BUNN ® HC-2 HC-3 (SERIAL # HC00025000 - UP) DISCONTINUED VERSION The information in this manual is no longer current. OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 27591.
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.
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. 26525.0000 00656.0000 00831.0000 12368.0002 11646.0000 27620.
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 set-up, 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 the terminal block for 120 volts across the black and white terminals on two wire 120 volt dispenser. (A2) Check the terminal block for 120 volts across the red and white terminal and the black and white terminal on three wire 120/240 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 flow control 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 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 Product overflows container 1. Dispense switch Refer to Service - Dispense Switch for testing procedures. See page 18 2. Dispense solenoid valve (Hot or Cold) Remove the solenoid valve and clear any obstructions. Rebuild or replace the valve if necessary. See page 30 or 31 1. Water temperature Place an empty container beneath the dispense tip.
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 1 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. 2 3 5. With the wires removed from the motor to be tested. Check for continuity across the two terminals on the bottom of the auger motor. 6 11 5 13 If continuity is present as described, reconnect the wires to the terminals on the bottom of the auger motor, the auger motor is operating properly.
5. SERVICE (cont.) AUGER DRIVE COMPONENTS (cont.) 6. 7. 14. Install hopper assy (21) in the dispenser by sliding hopper assy in the guides on the hopper support plate (20) until the slot in the bottom rear the hopper seats against the shoulder screw (19) in the hopper support plate. 8. 9. Auger Drive Motor (Refer to Fig. 2) 1. Disconnect the wires from the auger motor (17) to be removed. 2. Remove hopper assy (21) and set aside for reassembly. 3.
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 two #8-32 keps nuts securing the ballast to the dispenser base. 3. Remove and discard ballast. 4. Install new ballast over the two weld studs on the dispenser base and secure with two #8-32 keps nuts. 5. Refer to the illustration below when reconnecting the wires.
SERVICE (cont.) Test Procedure Mechanical Thermostat 1. Disconnect the dispenser from the power source. 2. Disconnect the black wire of the control thermostat from the black lead from the limit thermostat. 3. Remove bulb from the tank. 4. Check the voltage across black wire on the control thermostat and the white pole on the terminal block with the tank heater switch in the “ON” lower position with a voltmeter. Connect the dispenser to the power source.
9. 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. 10. Refer to the illustration below and reconnect the wires. NOTE - The capillary tube must be clear of any electrical termination and not kinked. SERVICE (cont.) CONTROL THERMOSTAT (cont.) Removal and Replacement. Mechanical Thermostat 1. Disconnect the wires from the thermostat. 2.
5. Disconnect the dispenser from the power source. SERVICE (cont.) DISPENSE SWITCH If voltage is present as described, proceed to #6. If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring harness. 6. Check for continuity across the wires removed from 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.
SERVICE (cont.) Removal and Replacement: 1. Remove hoppers from the dispenser. Refer to Fig. 2 for hopper removal. 2. Remove the four #8-32 screws securing the hopper mounting plate to the front panel and remove panel. 3. Remove the four screws securing the fan mounting plate to the dispenser front panel. 4. Lift fan mounting plate out of the front panel far enough so the fan leads can be disconnected from the main wiring harness. 5. Remove fan mounting plate, fan and exhaust tube as an assembly. 6.
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. SERVICE (cont.) FROTHER AND WHIPPER MOTOR If voltage is present as described, replace the motor. If voltage is not present as described, refer to the wiring diagrams and check the dispenser wiring harness. 1 2 12 P1203.45 11 FIG.
whipper chamber (4). Be sure the cutout part of the dispense tip is facing the outside of the dispenser. 23. 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). 24. 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. 25.
SERVICE (cont.) If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring harness. HOPPER DELAY BOARD 5. 6. 7. Reconnect the white and black wires of the hopper delay board harness to the main harness. Check the voltage across the terminals on the auger motor with a voltmeter. Press and hold the appropriate dispense switch. Connect the dispenser to the power source. After a delay of .7 seconds the indication must be: a) 120 volts ac for two wire 120 volt models.
SERVICE (cont.) 4. HOT/COLD SWITCH (Optional) Disconnect the dispenser from the power source. 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. 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.
If continuity is present as described, lamp holders are operating properly. If continuity is not present as described replace the lamp holder. SERVICE (cont.) LAMP HOLDER 1 2 Removal and Replacement: 1. Open dispenser door (1). 2. Remove the six #8-32 screws securing bottom door cover (5) to the door (1) and remove cover. 3. Disconnect the door wiring harness from the door interconnect wiring harness. 4. Remove eight #8-32 screws securing the upper door cover w/reflector (4) to the door. 5.
hole in the bottom cover (5) and releasing spring tabs. 8. Insert new starter (6) into socket and turn 90° until the pins snap in place. 9. Connect the plug on the sockets leads to the connector on the door wiring harness. 10. Install door bottom cover (5) with starter and starter socket on door assy (1) using six #8-32 screws. SERVICE (cont.
SERVICE (cont.) wiring diagram and check the dispenser wiring haness. LEVEL CONTROL BOARD AND LEVEL PROBE 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.
Location: The limit thermostat is located in the center of the tank lid. 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. Test Procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect both black wires from the limit thermostat. 3.
Removal and Replacement: 1. Disconnect the red leads from the overflow protection switch from the black wire from the terminal block 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.) RUN/RINSE SWITCH 4. 5. 6. Remove switch with wires attached from the back side of the front panel. Disconnect the wires from the switch and discard the switch. Referring to the illustration below (Fig. 24) reconnect the wires to the new switch. Install new switch with wires attached through the hole in the front panel and secure with facenut. FIG. 24 RUN/RINSE SWITCH TERMINALS FIG. 23 RUN/RINSE SWITCH P1213 P1199.
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 brewer to the power source.
Test Procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect the white and white/violet, white/blue or white/ brown 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, white/blue or white/brown 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 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.) 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. Listen carefully in the vicinity of the solenoid valve for a "clicking" sound as the coil magnet attracts. Disconnect the dispenser from the power source.
SERVICE (cont.) WHI or RED to Terminal Block 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.
TRANSFORMER (240V TWO WIRE MODELS ONLY) SERVICE (cont.) TANK HEATER SWITCH (cont.) 1 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 in the “OFF” upper position no continuity should be present between center and upper terminals.
SERVICE (cont.) TRANSFORMER (240V TWO WIRE MODELSONLY)(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. Install new transformer over the two weld studs on the dispenser base and secure with two #8-32 keps nuts. 5. Refer to Fig. 34 when renonnecting the wires. RED & BLK to Main Harness 1 2 3 BLK & WHI to Fan FIG.
SCHEMATIC WIRING DIAGRAM HC-2, & HC-3 GRN L2 N L1 One Configuration MUST be used! ELECTROMECHANICAL THERMOSTAT CONFIGURATION HEATER SW. BLU/BLK-16 BLK-16 THERMOSTAT BLU-16 BLK-16 BLK-16 LIMIT THERMOSTAT BLK-16 TANK HEATER BLK-16 TANK HEATER RED-16 (3-WIRE MODELS) WHI-16 (2-WIRE MODELS) ELECTRONIC THERMOSTAT CONFIGURATION HEATER SW.
SCHEMATIC WIRING DIAGRAM HCA-2, & HCA-3 GRN L1 L2 One Configuration MUST be used! ELECTROMECHANICAL THERMOSTAT CONFIGURATION HEATER SW. BLU/BLK-16 BLK-16 BLU-16 THERMOSTAT BLK-16 BLK-16 LIMIT THERMOSTAT BLK-16 TANK HEATER WHI -16 BLK-16 TANK HEATER WHI -16 ELECTRONIC THERMOSTAT CONFIGURATION HEATER SW.
