Bunn Coffee Maker HC-2 Service Manual

BUNN

DISCONTINUED VERSION

The information in this manual

HC-2 HC-3

(SERIAL # HC00025000 - UP)

is no longer current.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

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 equipment manufactured by it to be commercially free from defects in material and workmanship existing at the time of manufacture and appearing within one year from the date of installation. In addition:

1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and

workmanship for two years from the date of installation.

2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material

and workmanship for two years from the date of installation.

3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory

screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.

This warranty does not apply to any equipment, component or part that was not manufactured by Bunn or that, in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation, improper maintenance or repair, damage or casualty.

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 warranties that are binding on Bunn. Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and should not be relied upon.

The Buyer shall give Bunn prompt notice of any claim to be made under this warranty by telephone at (217) 529-6601 or by writing to Post Office Box 3227, Springfield, Illinois, 62708-3227. If requested by Bunn, the Buyer shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole discretion, that the equipment does not conform to the warranty, Bunn shall repair the equipment with no charge for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during the warranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, replace the equipment or refund the purchase price for the equipment.

THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AS SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, REPLACEMENT OR REFUND.

In no event shall Bunn be liable for any other damage or loss, including, but not limited to, lost profits, lost sales, loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities or services, or any other special, incidental or consequential damages.

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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

00831.0000

00656.0000

12368.0002

11646.0000

27620.0000

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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 install

the legs in the dispenser base.

ELECTRICAL REQUIREMENTS

CAUTION - The dispenser must be disconnected from the power source until specified in

The 120 volt version of this dispenser has an attached cordset. The mating connector must be a NEMA 5-15R.

Initial Set-Up.

WHITE

NEUTRAL L1BLACK

120V. A.C.

P2185

Requires 2-wire grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz

L2 RED

WHITE

L1BLACK

120V A.C.

208 or

240V a.c.

P1841

Requires 3-wire, grounded service rated 120/208 volts or 120/240 volts ac, 20 amp, single phase, 60 HZ

L2 WHITE

L1 BLACK

240V A.C.

P2185

“A” models require 2-wire, grounded service rated 240 volts ac, 20 amp, single phase, 50 Hz

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. Remove the right side panel of the dispenser. 120 volt versions proceed to step 6. 120/240 volt and 240 volt versions proceed to next step.

5. Install the electrical wiring to the terminal block as illustrated above.

6. Connect the dispenser to the power source and verify the voltage at the terminal block. Reinstall the side

panel.

7. 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 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 (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 dispenser 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 dispenser. 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 Sanitation Manual of the Food and Drug Administration (FDA).

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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. 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, and twenty minutes on 120/240 and 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. Place a set of keyholes in the cup locator plate over the screws beneath the hopper access door and push

down gently.

c. Fill the hopper(s) with the dry product to be dispensed.

DISPENSER USE

1. Simply place a cup on the drip tray beneath the desired 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.

COLD BEVERAGE SET-UP (OPTIONAL)

Cold beverages may be dispensed from the left dispense position on the HC-2 & HC-3 models. Simply place

the HOT/COLD switch near the left 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 solenoid(s) is (are) preset to dispense approximately one ounce per second. This

amount can be adjusted:

1. Disconnect the dispenser from the power source.

2. Remove the small right side access panel.

3. Rotate the control at the base of the desired solenoid(s) clockwise to decrease or counterclockwise to increase the amount of water.

4. For cold beverage adjustment remove the 1-1/2” plug on the lower left side of the dispenser and rotate the needle valve clockwise to decrease or counterclockwise to increase the amount of cold water.

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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.

HOPPER DISPENSE RATE OF PRODUCT

1. Hopper dispense rate with 22 tooth gear and auger wire is approximately 4 to 6 grams per second.

2. Hopper dispense rate with 22 tooth gear and auger wire with optional restrictor is approximately 3 to 5 grams per second.

3. Hopper dispense rate with optional 32 tooth gear and auger wire is 6 to 9 grams per second.

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, and repair of electrical equipment should be performed only by qualified service personnel.

• All electronic components have 120 volt ac or 240 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.

• The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will help

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

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TROUBLESHOOTING (cont.)

PROBLEM

Product will not dispense

PROBABLE CAUSE

1. No water

2. No power or incorrect voltage to the dispenser

REMEDY

Water lines and valves to the dispenser must be open.

(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. (A3) Check the terminal block for 240 volts across the white and black terminal on two wire 240 volt dispenser.

(B) Check circuit breakers or fuses.

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

Refer to

Service

- Dispense Switch for testing procedure. See page 18

Refer to

Service

- Dispense solenoid valve for testing procedures. See page 30 or 31

Refer to

Service

- Solenoid Valve (Inlet) for testing procedures. See page 32

Refer to

Service

- Level Control Board and Probe for testing procedures. See page 26

Refer to

Service

- Overflow protection switch for testing procedures. See page 28

Refer to

Service

- Auger Drive.

See page 12

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TROUBLESHOOTING (cont.) PROBLEM

PROBABLE CAUSE

REMEDY

Product will not dispense (cont.)

Water is not hot

9. Water strainer

10. 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.

1. Limit thermostat CAUTION - Do not eliminate or bypass limit thermostat. Use only BOM replacement part #29329.1000

(A) Direction of flow arrow must be pointing towards dispenser.

(B) Remove the flow control and check for obstructions. Clear or replace.

Inspect the tank assembly for excessive lime deposits. Delime as required.

Refer to

Service

- Limit Thermostat for testing procedures. See page 27

Spitting or excessive steaming

2. Control thermostat (mechanical or electronic)

3. Tank Heater

4. Tank heater switch

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.

2. Control thermostat (mechanical or electronic)

Refer to

Service

- Control Thermostat for testing procedures. See page 16

Refer to

Service

- Tank Heater for testing procedures. See page 33

Refer to

Service

- Tank Heater Switch for testing procedures. See page 34

Inspect tank assembly for excessive lime deposits. Delime as required.

Refer to

Service

- Control Thermostat for testing procedures. See page 16

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TROUBLESHOOTING (cont.) PROBLEM

PROBABLE CAUSE

REMEDY

Dripping from dispense tip

Water flows into tank continuously

2. Dispense solenoid valve (Hot or Cold)

1. Level control board and probe

2. Solenoid valve (Inlet)

Inspect the tank assembly for excessive lime deposits. Delime as required.

Remove the dispense solenoid valve and clear any obstructions. Rebuild or replace the valve if necessary. See page 30 or 31

Refer to

Service -

Level Control Board and Probe for testing procedures. See page 26

Refer to

Service

- Solenoid Valve (Inlet) for testing procedures. See page 32

3. Overflow Protection Switch

Refer to

Service

- Overflow Protection Switch for testing procedures. See page 28

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TROUBLESHOOTING (cont.) PROBLEM

PROBABLE CAUSE

REMEDY

Product overflows container

Weak product

1. Dispense switch

2. Dispense solenoid valve (Hot or Cold)

1. Water temperature

Refer to

Service -

Dispense Switch for testing procedures. See page 18

Remove the solenoid valve and clear any obstructions. Rebuild or replace the valve if necessary. See page 30 or 31

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 thermo-

stat models should be 180°F to 200°F

(see thermostat temperature settings decal in

USER NOTICES

on page 3.

(B) Reading for electronic thermo-

stat should be185°F to 190°F.

Adjust the control thermostat to increase or decrease the water temperature. Replace if necessary.

2. Whipper motor

3. Frother

4. Dispense solenoid valve (Hot or Cold)

5. Auger drive

6. Auger spring

7. Auger motor

Refer to

Service

- Whipper Motor for

testing procedure. See page 20

Refer to

Service

- Frother Compo-

nents. See page 20

Refer to

Service

- Dispense Solenoid Valve for test procedures. See page 30 or 31

Refer to

Service

- Auger Drive Com-

ponents. See page 12

Refer to

Service

- Auger Drive Com-

ponents. See page 12

Refer to

Service

- Auger Drive Com-

ponents. See page 14

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TROUBLESHOOTING (CONT.)

PROBLEM

Dispenser is making unusual noises

Excess dust

PROBABLE CAUSE

1. Plumbing Lines

2. Water Supply

3. Tank Heater

1. Fan

2. Hopper Delay Board

REMEDY

Plumbing lines should not be resting on the counter top.

(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).

Remove and clean lime off the tank heater. See page 33

Refer to

Service

- Fan for testing

procedures. See page 19

Refer to

Service

- Hopper Delay Board for testing procedures. See page 22

Display not lit

3. Transformer (240V 2 Wire Models Only)

1. Lamp

2. Lamp Holder

3. Starter - Lamp

4. Ballast

Refer to

Service

- Transformer for testing procedures. See page 35

Refer to

Service

- Lamp, see page 24 for lamp replacement.

Refer to

Service

- Lamp Holder for testing procedures. See page 24

Refer to

Service

- Starter for testing procedures. See page 25

Refer to

Service

- Ballast for testing procedures. See page 15

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SERVICE

This section provides procedures for testing and replacing various major components used in this dispenser should service become necessary. Refer to

Troubleshooting

cause of any problem. WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. The dispenser should be unplugged when servicing, except when electrical tests are required and the test procedure specifically states to plug-in the dispenser.

COMPONENT ACCESS WARNING - Disconnect the dispenser from the power

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 covers, reflector, dispenser top covers, left and right side covers.

for assistance in determining the

AUGER DRIVE COMPONENTS

Refer to the contents listing for component location.

Contents

Auger Drive Components...................................... 12

Auger Motor ......................................................... 14

Ballast ................................................................... 15

Control Thermostat...............................................16

Dispense Switch ...................................................18

Fan........................................................................19

Frother ................................................................. 20

Hopper Delay Board.............................................. 22

Hot/Cold Switch .................................................... 23

Lamp Holder ......................................................... 24

Lamp .................................................................... 24

Lamp Starter and Socket ...................................... 25

Level Control Board and Level Probe .................... 26

Limit Thermostat .................................................. 27

Overflow Protection Switch .................................. 28

Rinse/Run Switch .................................................29

Solenoid (Cold Drink - Optional) ........................... 30

Solenoid (Dispense) ............................................. 31

Solenoid (Inlet) ..................................................... 32

Tank Heater .......................................................... 33

Tank Heater Switch ............................................... 34

Transformer (240V Models Only) .........................35

Whipper Motor ..................................................... 20

Wiring Diagrams.......................................... 37 & 38

FIG. 1 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 front panel. Refer to Fig. 2 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 white/violet wire for

the right motor, white/blue wire for the center motor or the white/red wire for the left motor and the white/black wire with a voltmeter. Press and hold the appropriate Dispense switch. 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. c) 240 volts ac for two wire 240 volt models.

4. Disconnect the dispenser from the power supply.

P1199.45

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