Bunn H5M User Manual

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BUNN® H5M

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OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: (217) 529-6601 FAX: (217) 529-6644

CONTENTS

Introduction .................................................	2
Warranty ......................................................	2
User Notices ................................................	3
Electrical Requirements ...............................	4
Plumbing Requirements ..............................	4
Initial Set-Up ................................................	5
Draining the Dispenser ................................	5
Cleaning .......................................................	5
Troubleshooting ..........................................	6
Service .........................................................	9
Wiring Schematics.....................................	19

INTRODUCTION

This equipment heats and dispenses water on demand for beverages and cooking purposes. This equipment is for indoor use, either wall-mounted or 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.

2	10267 071900

USER NOTICES

The notices on this dispenser should be kept in good condition. Replace unreadable or damaged labels.

00656.0000
3	10267 071900
3
12593.0000	10044.0000

ELECTRICAL REQUIREMENTS

CAUTION - The dispenser must be disconnected from the power source until specified in Initial Set-Up.

The H5M dispenser requires 2-wire, grounded service rated 120, 208, or 240 volts ac, 20 amp, single phase. The H5MA, 230V-CE dispenser requires 2-wire, grounded service rated 230 volts ac, 40 amp, single phase, 50/ 60Hz. (Refer to the dispenser’s dataplate for exact voltage requirement.)

Electrical Hook-Up

WHITE

NEUTRAL 120V.A.C.

L1 BLACK

L2 RED

208 or 240V.A.C.

L1 BLACK

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.Remove the upper and lower rear panels. Turn the knob of the thermostat to the “OFF” position (fully counterclockwise).

4.Install a strain relief and the proper electrical wiring to the terminal block.

5.Connect the dispenser to the power source and verify the voltage at the terminal block before proceeding. Reinstall both rear panels.

6.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 Set-Up.

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).

Plumbing Hook-Up

1.Flush the water line and securely attach it to the flare fitting on the rear of the dispenser.

2.Turn-on the water supply.

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10267 071900

INITIAL SET-UP

CAUTION - The dispenser must be disconnected from the power source throughout the initial set-up, except when specified in the instructions.

1.Remove the upper rear panel and rotate the control thermostat

	knob fully counterclockwise to the “OFF” position and replace
	the panel.
2.	Connect the dispenser to the power source and turn-on the water
	supply.
3.	Water will automatically flow into the tank to the proper level
	and shut-off. This will take approximately 10 minutes.
4.	Disconnect the dispenser from the power source, remove the
	upper rear panel and place the control thermostat knob fully
	clockwise to the “ON” position, and replace the panel.
5.	Connect the dispenser to the power source and wait approxi-
	mately twenty minutes for the water in the tank to heat.
6.	On models with ready indicator, the indicator will glow when the	P1781
	proper water temperature for use is achieved.

DRAINING THE DISPENSER

CAUTION - The dispenser must be disconnected from the power source throughout these steps.

1.Disconnect the dispenser from the power source.

2.Shut-off and disconnect the incoming water supply

3.Remove the 4-40 screws at the sides of the top panel.

4.Gently remove one of the grommets from the tank lid.

5.Insert a tube to the bottom of the tank and syphon ALL of the water out. Bunn-O-Matic has a syphon assembly available (#12440.0000) for this purpose.

NOTE - The dispenser must be full using the INITIAL SET-UP steps before reconnecting to the power source.

CLEANING

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.

WALL MOUNTED INSTALLATION

If the dispenser is wall mounted, the bottom of the dispenser should be at the same height as a counter or table top. Use B.O.M. part #12542.0000 for side mounted Wall Bracket Kit or # 13125.0001 for front mounted Wall Bracket Kit .

SUPPORT FOR LARGE RECEPTACLES

CAUTION: If the dispenser is to be used with larger receptacles such as pitchers or pots, those receptacles must be adequately supported during dispensing of hot water to avoid spillage of very hot water. This support may be provided by a table or counter top, or use B.O.M. part #12599.0000 Shelf Kit

5	10267 071900

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 – 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 dispenser is heated at all times. Keep away from combustibles.

WARNING

•Exercise extreme caution when servicing electrical equipment.

•Disconnect the dispenser from the power source when servicing, except when electrical tests are specified.

•Follow recommended service procedures

•Replace all protective shields or safety notices

Problem	Probable Cause	Remedy
Equipment will not operate.	1. No power or incorrect voltage	(A) Check the terminal block for the cor-
		rect voltage. It should be:
		a.) 100 to 120 volts ac across the black and
		white terminals for 100 to 120 volt mod-
		els,
		b.) 200 to 240 volts ac across the red and
		black terminals for 200 to 240 volt models
		c.) 230 volts ac across the red and black
		terminals for 230 volt models.
		(B) Check circuit breakers or fuses.
	2. Safety overflow switch	Refer to Service – safety overflow switch
		for testing procedures. See page 11.

6	10267 071900

TROUBLESHOOTING (cont.)

Problem

Probable Cause

Remedy

Automatic refill will not operate 1. No water after drawing hot water.

Check plumbing and shut-off valves.

	2.	Water strainer/flow control	(A) Direction of flow arrow must be point-
			ing towards dispenser.
			(B) Remove the strainer/flow control and
			check for obstructions. Clear or replace.
	3.	Safety overflow switch	Refer to Service – safety overflow switch
			for testing procedures. See page 11.
	4.	Liquid level system	Refer to Service – liquid level board for test-
			ing procedures. See page 15.
	5.	Solenoid valve	Refer to Service – solenoid valve for test-
			ing procedures. See page 12.
Water flows into the tank con-	1. Solenoid valve		Refer to Service – solenoid valve for test-
tinuously (Dispenser discon-			ing procedures. See page 12.
nected from power source).
Water flows into the tank con-	1. Liquid level system		Refer to Service – liquid level board for test-
tinuously (Dispenser connected			ing procedures. See page 15.
to power source).
Water is cold.	1. Control thermostat		Control thermostat must be in the “ON”
			position.
	2.	Safety overflow switch	Refer to Service – safety overflow switch
			for testing procedures. See page 11.
	3.	Limit thermostat	Refer to Service – limit thermostat for test-
			ing procedures. See page 10.

CAUTION – Do not eliminate or bypass limit thermostat. Use only B.O.M. replacement part #23717.0001.

4.	Tank heater	Refer to Service – tank heater for testing
		procedures. See page 13.
5.	Temperature control	Refer to Service – control thermostat for
		testing procedures. See page 14.

7	10267 011599

TROUBLESHOOTING (cont.)
Problem	Probable Cause		Remedy
Water boils continuously.	1.	Temperature control	Refer to Service – control thermostat for
			testing procedures. See page 14.
	2.	Lime build-up	Inspect the tank assembliy for excess lime
			deposits. Delime as required.

CAUTION – Tanks and tank components should be delimed reglarly depending on local water conditions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.

Dispenser is making unusual 1.	Solenoid valve
noises.
2.	Plumbing lines
3.	Water supply

Ready indicator will not light. 1. Temperature control (when temperature is within 4°

of its selected setting.)

2. Ready Indicator LED

The nut on top of the solenoid valve must be tight or it will vibrate during operation.

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 be higher than 90 psi (620 kPa). Install a regulator if necessary to lower the working pressure to approximately 50 psi (345 kPa).

Refer to Service – control thermostat for testing procedures. See page 14.

Replace the indicator LED.

8	10267 011599

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.

Component Access

WARNING – Disconnect the dispenser from the power source before the removal of any panel or the replacement of any component.

The limit thermostat, liquid level probe, tank heater, and temperature sensor are located at the top of the dispenser. Access is gained by removing the top lid, attached with three 4-40 slotted-head screws.

WARNING – Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. Disconnect the dispenser from the power source when servicing, except when electrical tests are required and the test procedure specifically states to connect the dispenser to the power source.

Contactor ............................................................	17
Limit Thermostat ................................................	10
Liquid Level Board ..............................................	15
Safety Overflow Switch .......................................	11
Solenoid Valve ....................................................	12
Tank Heater ........................................................	13
Control Thermostat .............................................	14

H!CON

TFR1

SERVICE (cont.)

Solenoid Valve

Location:

The solenoid valve is located inside the rear of the dispenser on the right side near the bottom.

6.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 after approximately 5 seconds, as the coil magnet attracts the plunger.

7.Disconnect the dispenser from the power source.

If the sound was heard as described and water will not pass through the solenoid valve, there may be a blockage in the water line before or after the solenoid valve or the solenoid valve may require inspection for wear and removal of waterborne particles.

If the sound was not heard as described, replace the solenoid valve.

Removal and Replacement:

1.Remove all wires from the solenoid valve coil.

2.Turn-off the water supply to the dispenser.

3.Disconnect the water lines to and from the solenoid valve.

4.Remove the two 8-32 slotted-head screws holding the solenoid valve and mounting bracket to the component bracket.

5.Lift-out the solenoid valve.

6.Remove the two 10-32 slotted-head screws holding the solenoid valve to its mounting bracket.

7.Securely install the new solenoid valve to its mounting bracket. The direction of flow arrow must be pointing towards the tank lid.

8.Attach the solenoid valve and mounting bracket to the component bracket.

9.Securely fasten the water lines to and from the solenoid valve.

10.Reconnect the wires, FIG. 6.

B L U

W H I

F I G .

				12	10267 011599
				12
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PBLKFIGTLocation:SERVICEestmoval.

SERVICE (cont.)

Thermostat

Location: The mechanical thermostat is located inside the upper rear panel. To test the thermostat, access will also be needed to the terminal block located inside the bottom access panel.

Test Procedure:

1.Disconnect the dispenser from the power source.

2.Check the voltage across the black wire on the thermostat and the white or red wire at the terminal block with a voltmeter. Connect the dispenser to

BLU/BLK to Limit Thermostat

BLK to Terminal Block	P1782

FIG. 10 THERMOSTAT WIRING

SERVICE (cont.)

Liquid Level Board

FIG. 11 LIQUID LEVEL BOARD

Location:

The liquid level board is located inside the lower panel.

Test Procedure:

1.Disconnect the dispenser from the power source.

2.Remove the blue wire from terminal 1 and the pink wire from terminal 4 of the circuit board.

3.Check the voltage across terminals 2 and 3 with a voltmeter. Connect the dispenser to the power source. Turn the thermostat knob to the “ON” position (fully clockwise). The indication must be: a.) 100 to 120 volts ac for 100 to 120 volt models, b.) 200 to 240 volts ac for 200 to 240 volt models, c.) 230 volts ac for 230 volt models.

4.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to the wiring diagrams and check the wiring harness.

SERVICE (cont.)

Liquid Level Board (cont.)

15.Move the probe's flat end to the dispenser housing. The indication must be 0.

16.Move the probe's flat end away from the dispenser housing. The indication should again be:

a.) 100 to 120 volts ac for 100 to 120 volt models, b.) 200 to 240 volts ac for 200 to 240 volt models, c.) 230 volts ac for 230 volt models.

17.Disconnect the dispenser from the power source.

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.

Removal and Replacement:

1.Remove all wires from the level control board.

2.Remove two #8-32 screws holding level control board and mounting bracket to the component bracket.

3.Install the new level control board and mounting bracket to the component bracket.

4.Refer to FIG. 12 when reconnecting the wires.

BLU to Solenoid (T-1)

BLK to Overflow Safety Switch (T-2)

WHI to Terminal Block (T-3)

PNK to Level Probe (T-4)

P1784

FIG. 12 LIQUID LEVEL BOARD WIRING

16	10267 071900

SERVICE (cont.)

Contactor

P1785

FIG. 13 CONTACTOR

Location:

The contactor is located on the component bracket inside the lower rear panel.

Test Procedures:

1.Disconnect the dispenser from the power source.

2.Disconnect the black wire from the contactor coil to the limit thermostat and black wire from the red wire on the main harness on two wire 240V models.

3.Check the voltage across the red wire and black wire with a voltmeter. The indication must be:

a.) 240 volts ac for 240 volt models, b.) 230 volts ac for 230 volt models.

4.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to #5.

If voltage is not present as described refer to the Wiring Diagrams and check the wiring harness.

5.Check for continuity between the left and right terminals on the contactor coil.

If continuity is present as described, reconnect the wires and proceed to #6

If continuity is not present as described, replace the contactor.

6.Check the voltage across the upper left terminal and the upper right terminal on the contactor with a voltmeter. Connect the dispenser to the power source. The indication must be:

a.) 240 volts ac for 240 volt models, b.) 230 volts ac for 230 volt models.

7.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to #8.

If voltage is not present as described, refer to the wiring diagrams and check the wiring harness.

8.Check for continuity across the terminals on the left side of the contactor by manually closing the contacts. Continuity must not present when the contact is released.

9.Check for continuity across the terminals on the right side of the contactor by manually closing the contacts. Continuity must not be present when the contact is released.

If continuity is present as described, the contactor is operating properly.

If continuity is not present as described, replace the

SERVICE (cont.)

Contactor (cont.) contactor.

Removal and Replacement:

1.Disconnect all the wires from the contactor.

2.Remove the two #8-32 screws securing the contactor to the contactor mounting bracket, remove contactor and protective shield. Discard

contactor.

3.Install new contactor with shield between mounting bracket and contactor and secure with two #8- 32 screws

4.Refer to Fig. 14 and reconnect the wires.

	RED to Terminal Block(L2)
BLK to left Tank	BLK to Terminal
Heater	Block (L1)
RED to Right
Tank Heater
BLK to Limit	RED from Main Harness
Thermostat
	P1725
FIG.14 CONTACTOR WIRING
	18	10267 011599
	18

WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM H5M

OPTIONAL

READY INDICATOR

BLK

SW&

LIMIT

GREEN

THERMOSTAT

BLK

BLU/BLK

BLK

TANK HEATER

WHI

LIQUID

OVERFLOW

LEVEL

BOARD

PROTECTION SWITCH

BLU

WHI

BLK

RED

BLK

SOL

WHI

120 VOLTS A C

2 WIRE

(PROBE)

SINGLE PHASE

10243.0000D 1/99

SCHEMATIC WIRING DIAGRAM H5M

GREEN

BLK

N.O.

BLK

RED

N.O.

RED

OPTIONAL

TANK HEATER

READY INDICATOR

BLK

RED

SW&

LIMIT

THERMOSTAT

BLK

THERMOSTAT

BLK

BLU/BLK

BLK

RED

LIQUID

LEVEL

OVERFLOW

BOARD

PROTECTION SWITCH

BLU

RED

SOL

BLK

RED

BLK

RED

208 or 240 VOLTS A C

2 WIRE

(PROBE)

SINGLE PHASE

10262.0000C

1/99

19	10267 011599

WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM H5MA, 230V CE

GREEN

THERMAL

N.O.

FUSE

N.O.

BLK

BLK-12

RED-12

RED

TANK HEATER

SW&

LIMIT

THERMOSTAT

BLK

THERMOSTAT

BLU/BLK

BLK

RED

LIQUID

LEVEL

OVERFLOW

BOARD

PROTECTION SWITCH

BLU

RED

SOL

BLK

RED

BLK

RED

N.C.

230 VOLTS A C

(PROBE)

2 WIRE

SINGLE PHASE

10262.0001A

20	10267 071900