American Dryer Corp AD-840 User Manual

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AD-840

Electrical Troubleshooting

Manual

1998

American Dryer Corporation

88 Currant Road

Fall River, MA 02720-4781

Telephone: (508) 678-9010 /Fax: (508)678-9447

E-mail: techsupport@amdry.com

010998WS/tf

ADC Part No. 182731

Retain This Manual In A Safe Place For Future Reference

American Dispensing Company products embody advanced concepts in engineering, design, and safety. If this product is properly maintained, it will provide many years of safe, efficient, and trouble-freeoperation.

ONLY properly licensed technicians should service this equipment.

OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation/operator's manual included with the dryer.

WARNING: UNDER NO CIRCUMSTANCES should the door switch or the heat circuit devices ever be disabled.

We have tried to make this manual as complete as possible and hope you will find it useful. ADC reserves the right to make changes from time to time, without notice or obligation, in prices, specifications, colors, and material, and to change or discontinue models.

Important

For your convenience, log the following information:

DATE OF PURCHASE

 

MODEL NO.

AD-840

DISTRIBUTORS NAME

Serial Number(s)

Replacement parts can be obtained from your distributor or the ADC factory. When ordering replacement parts from the factory, you can FAX your order to ADC at (508) 678-9447or telephone your orders directly to the ADC Parts Department at (508)678-9010.Please specify the dryer model number and serial number in addition to the description and part number, so that your order is processed accurately and promptly.

IMPORTANT

YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA

(Occupational Safety and Health Administration) STANDARDS.

CAUTION

LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING AD-840.WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION.

FOR YOUR SAFETY

THE SYSTEM IS SHIPPED WITH A PRESERVATIVE SOLUTION MADE OF SODIUM BISULFITE AND (IN THE WINTER MONTHS) GLYCERINE. MAKE SURE THE SYSTEM IS THOROUGHLY PURGED BEFORE LETTING ANYONE DRINK THE DISPENSED WATER.

REFER TO THE INSTALLATION SECTION ON PURGING PROCEDURE.

CAUTION

Never look directly into the unprotected parts of the U.V. chamber when there is power to the sterilizer. Serious burns to the eyes and the skin may result. Always unplug power to the sterilizer before working on it.

IMPORTANT

Please observe all safety precautions displayed on the equipment and / or specified in the installation / operators manual included with the AD-840.

IMPORTANT

The wiring diagram for the water vending machine is located behind the coin control door.

Water vending machine(s) must not be installed or stored in an area where it will be exposed to water and / or weather.

 

Table of Contents

 

MICROPROCESSOR FAILURE CODES .......................................................................................

2

1.

Flow Meter .......................................................................................................................................

2

2.

R.O. Filter.........................................................................................................................................

2

3.

Filter .................................................................................................................................................

2

4.

Overflow...........................................................................................................................................

2

5.

Use Other Side .................................................................................................................................

2

6.

Changer Unplug ................................................................................................................................

2

7.

System Refill Please Wait ...................................................................................................................

2

8.

System Purge Do Not Drink ..............................................................................................................

3

ELECTRICAL PROBLEMS ASSOCIATED with MICROPROCESSOR FAILURE CODES ....

4

1.

Flow Meter Error ..............................................................................................................................

4

2.

R.O. Filter Error................................................................................................................................

6

3.

Filter Error ........................................................................................................................................

7

4.

Overflow Error..................................................................................................................................

8

 

A. U.V. Light .................................................................................................................................

8

 

B. Base Float Switch .....................................................................................................................

9

 

C. Containment Tank Overflow Switch ...........................................................................................

9

 

D. Vending Bay Tank Overflow Switch .........................................................................................

10

5.

Changer Unplug Error .....................................................................................................................

11

6.

System Refill Please Wait .................................................................................................................

12

PUMP MOTORS ..............................................................................................................................

12

1.

Dispensing Pump Motor ..................................................................................................................

12

2.

Drain Pump Motor ..........................................................................................................................

13

3.

3/4 hp Motor ..................................................................................................................................

14

ELECTRICAL COMPONENT LIST ..............................................................................................

15

MICROPROCESSOR FAILURE CODES

The microprocessor continually monitors the machine operation. When an error occurs the machine will display a variety of failure codes, which will lead the service technician to the potential problem. The messages displayed do not pinpoint the problem within the wiring of the machine. However, they will indicate one or more possible failures. Reference to the wiring diagram is necessary.

The possible “OUT OF ORDER” failure codes will consist of the following:

1. FLOW METER ... this failure indicates the machine has a dispensing problem. The microprocessor did not detect a flow of water on either side (refer to Item #1 onpage 4).

2. R.O. FILTER ... this failure indicates the R.O. membrane filter is in need of service, or may signify a problem with the R.O. comparator. (refer to Item #2 onpage 6)

3. FILTER ... this failure can indicate a variety of problems: (refer to Item #3 onpage 7)

a. Sediment and/or carbon filters are in need of replacement.

b. High pressure switch has been triggered.

c. Supply water is continuously less than recommended installation specifications.

4. OVERFLOW ... this failure can indicate a variety of problems: (refer to Item #4 onpage 8)

a. U.V. light has failed and is in need of service.

b. Base float switch has been triggered.

c. Tank overflow float switch has been triggered.

d. Vending bay tank overflow switch has been triggered.

e. Relay board failure.

5. CHNGR UNPLUG ... this failure indicates there is a problem communicating with the coin changer. (refer to Item #5 onpage 11)

6. SYSTEM REFILL PLEASE WAIT ... this message indicates the water in the containment tank is low and is in the process of being refilled. The message will automatically be reset when the system has enough water to cover the maximum amount of water that can be dispensed in one purchase. (refer to Item #6 onpage 12)

2

7. SYSTEM PURGE DO NOT DRINK ... this message will appear upon turn on of the machine. It is not actually a failure but an installation safeguard. This routine will flush out the preservatives that keep the R.O. Membrane contaminant free during storage. The flushing will be accomplished by dispensing water for an extended period of time which will stop automatically.

NOTE: With the exception of #6, ALL failure codes can be reset by entering the following key combinations ([6 GAL.] , [5 GAL.] , [1 GAL.] ). If the trigger failure is still present, the code will not reset.

DO NOT RESET THIS SAFETY ROUTINE FOR THE INSTALLATION.

3

ELECTRICAL PROBLEMS ASSOCIATED with

MICROPROCESSOR FAILURE CODES

1.FLOW METER ERROR

The Flow Meter error message could be the result of the following: a. Flow meter failure.

1)Flow meter sensor may need replacement.

2)Flow meter housing may need replacement.

b. A disconnected plug on the microprocessor panel. c. Failures with the dispensing solenoid valves.

d. The trap door switch is defective or misadjusted. e. Defective trap door solenoid.

f.Microprocessor output failure.

g.Faulty dispensing pump.

1)Unplugged dispensing pump.

2)Defective dispensing pump.

3)Defective relay board.

h.Polishing filter is in need of replacement.

4

Photo0029

Photo0017

Photo0036

NOTE: When a complete flow meter is changed some reprogramming is required. The machine is relying on the information provided by the flow meter for accurate vending. The counts per gallon in the program will have to be changed along with the flow meter. If just the sensor element is replaced, the recalibration may not be necessary.

To set just the calibration on both vending bays using teach mode proceed as follows:

Step #1

a. Vend at least 1 gallon to purge out air pockets in the lines prior to calibration. b. Turn the keypad program switch to the program mode.

c. Press the [1 GAL.] selection key then press the [6 GAL.] selection key. Both displays will flash “TEACH MODE GALLON”.

d. Place calibrated 1 gallon containers in the vending bay.

5

e. Press and hold the [4 GAL.] selection key to activate the vending bay.

f.When the gallon has filled completely, release the key.

g.Press the [2 GAL.] selection key. This is necessary to retain the information in memory.

NOTE: After the counts have been derived the microprocessor will not override the previous values that are stored in memory. The microprocessor needs an enter confirmation. By pressing the [2 GAL.] selection key you will confirm the new entries.

i.The display will then show the new values.

j.Turn the keyed program switch back to the run position.

2.R.O. FILTER ERROR

The R.O. Filter Error message could be the result of the following:

a. The R.O. Membrane is in need of replacement or cleaning;

Take a TDS measurement of the inlet and product side of the R.O. membrane.

The product TDS measurement should be 25% or less of the input TDS measurement. The TDS measurement can only be taken after the 3/4 HP pump has rn at least 1 minute.

b. The R.O. Comparator has failed;

Test the R.O. Comparator with an ADC comparator tester.

c. The test cell has failed;

Remove and inspect both test cells for broken leads and corrosion.

(Refer to wiring diagram SECTION A-1throughA-5for electrical reference)

R.O. Comparator

 

Test Cells

Alarm / Power

 

 

Connection

Inlet Test Cell

Outlet Test Cell

 

Photo0031

 

 

 

 

 

 

Photo0032 Photo0033

Inlet Test Cell

Outlet Test Cell

Connection

Connection

6