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Bunn H5X - page 1
H10X/H5X H5E/DV PC H5 ELEMENT With Digital Control Board SER VICE MANU AL BUNN-O-MA TIC CORPORA TION POST OFFICE BO X 3227 SPRINGFIELD , ILLINOIS 62708-3227 PHONE: (217) 529-6601 F AX: (217) 529-6644 T o ensure you have the latest revision of the manual or to obtain the illustrated parts catalog, please visit the Bunn-O-Matic website, at www .bunn. ...
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Bunn H5X - page 2
2 BUNN-O-MA TIC COMMERCIAL PRODUCT WARRANTY Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows: 1) All equipment other than as specifi ed below: 2 years parts and 1 year labor . 2) Electronic circuit and/or control boards: parts and labor for 3 years. 3) Compressors on refrigeration equipment: 5 years parts and 1 year ...
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Bunn H5X - page 3
3 WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualifi ed ser vice personnel. Disconnect the dispenser fromthe power source when servicing, except when electrical tests are required and the test procedure specifi cally states to connect the dispenser to the power sour ce. 42311 071310 CONTENTS T ro ...
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Bunn H5X - page 4
4 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 T echnical Ser vice Department. • Inspection, testing, and repair of electrical equipment should be performed only by qu ...
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Bunn H5X - page 5
5 TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Equipment will not operate (cont.) Automatic refi ll will not oper - ate after drawing hot water . Water fl ows into the tank con- tinuously (Dispenser discon- nected from power source). Water fl ows into the tank con- tinuously (Dispenser connect- ed to power source). Water is cold. 2. Saf ...
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Bunn H5X - page 6
6 TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Water boils continuously . Dispenser is making unusual noises. Ready indicator will not light. 1. T emperature control 2. Lime build-up 1. Plumbing lines 3. Water supply 1. T emperature control 2. Ready Indicator LED Refer to Service – electronic controls for testing procedures. Inspect the ...
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Bunn H5X - page 7
7 Faceplate Removal - H5 ELEMENT : After removing top cover , remove the two upper screws securing the faceplate. Carefully lift faceplate straight up until the three lower screws clear the key holes. The check valve, electronic control assembly , safety overfl ow switch, solenoid valve, overfl ow tube tempera- ture sensor and terminal block are ...
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Bunn H5X - page 8
8 SERVICE Electronic Controls FIG. 8a ELECTRONIC CONTROL P4093.35 V oltage present at Solenoid V alve ? V oltage present at Solenoid V alve ? Overflow Cup Full ? Remove Power Disconnect Level Probe Retry Drain cup No Ye s Ye s Ye s Ye s No No No H5E, H5X LIQUID LEVEL CONTROL PROBLEM: Does Not Refill Does Water Flow ? Replace Probe Unplug Ready Lamp ...
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Bunn H5X - page 9
9 SERVICE (cont.) Electronic Controls (cont.) Liquid Level Control T est Procedure 1. Disconnect the dispenser from the power sour ce. 2. Check the voltage across terminals 3 & 4 of the electronic control board with a voltmeter . Connect the dispenser to the power source. The indication must be: a.) 100 to 120 volts ac for 100 to 120 volt model ...
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Bunn H5X - page 10
10 Electronic Controls (cont.) 7. Reconnect the pink wire to terminal 5 of the elec- tronic control assembly . 8. Loosen the compression fi tting, remove the probe from the tank lid, and inspect it for mineral depos- its. Replace it if necessary . Keep the exposed ends of the probe away from any metal surface of the dispenser . 9. Check the voltag ...
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Bunn H5X - page 11
11 SERVICE (cont.) Electronic Controls (cont.) If voltage was present as described, the temperature control of the system is operating properly . If voltage was not present as described, contact Bunn-O-Matic to order an electronic control board and temperature sensor for evaluation and proceed to #9. 6. Replace the electronic control board. 7. Chec ...
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Bunn H5X - page 12
12 SERVICE (cont.) Limit Thermostat Location: The limit thermostat is located on the tank lid. T o test the limit thermostat, access will also be needed to the terminal block located at the rear of the dispenser . If voltage was present as described, reconnect the black wire and proceed to #5. If voltage was not present as described, refer to the W ...
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Bunn H5X - page 13
13 SERVICE (cont.) Safety Overfl ow Switch Location: The safety overfl ow switch is located inside the rear of the dispenser inside the copper overfl ow cup. For testing or removal of the safety overfl ow switch, access may also be needed by removing the two screws attaching the electronic control assembly to its mount- ing bracket. T est Proce ...
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Bunn H5X - page 14
14 SERVICE (cont.) Solenoid Valve (Late Models) Location: The solenoid valve is located inside the rear of the dispenser on the right side near the bottom. T o test the solenoid valve, access will also be needed to the electronic control board. sound after approximately 5 seconds, as the coil magnet attracts the plunger . 8. Disconnect the dispense ...
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Bunn H5X - page 15
15 Solenoid Valve (Early Models) Location: The solenoid valve is located behind the large access panel on the left side of the dispenser . T o test the solenoid valve, access will also be needed to the electronic control board. BUNN 90 psig max operating pressure Strainer/Flow Control # 22300.0750 (Repl. Flow Washer #20526.0750) (Repl. Screen #2372 ...
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Bunn H5X - page 16
16 SERVICE (cont.) T ank Heater Location: The tank heater is located in the tank lid. T est Procedure: 1. Disconnect the dispenser from the power sour ce. 2. Check the voltage across the terminals of the tank heater with a voltmeter . Connect the dispenser to the power source. The indication must be: a.) 100 to 120 volts ac for 100 to 120 volt mode ...
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Bunn H5X - page 17
Steam Sensor (Thermistor) Location: The thermistor is located on the end of the overfl ow tube above the overfl ow cup. T o test the thermistor , access will also be needed to the electronic control board. SERVICE (cont.) P1993 FIG. 17b LOCA TION H 10X P1993 FIG. 17a LOCA TION H 5X T est Procedure: 1. Disconnect the dispenser from the power sour ...
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Bunn H5X - page 18
SERVICE (cont.) Dispense Valve (PC Only) Location: The Dispense Valve is located behind control panel. T est Procedures: 1. Check the valve for coil action. T urn on the valve with the dispense button. Listen carefully in the vicinity of the dispense valve for a click as the coil pulls the plunger in. If no sound is heard as described, proceed to # ...
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Bunn H5X - page 19
42311 071310 19 RELA Y N.O. COM 3 1 5 4 2 F ACTORY J1-1 J1-5 H5-PC NO JUMPER Early H5E, H5X, H10X Install jumper thru ver . 1.04 J3-1 J3-5 J5-1 J4-1 J6-1 NO TE: no jumper used on an y Model star ting with ver . 1.08 J2 J7 MAIN CONTROL BOARD 1 2 3 4 + - + - USED ON H5X ONL Y 120V AC 2 WIRE + GND 120/208V AC 3 WIRE + GND 120/240V AC 3 WIRE + GND SING ...
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Bunn H5X - page 20
42311 071310 20 230V AC 2 WIRE + GND SINGLE PHASE RELA Y N.O. COM 3 1 5 4 2 F ACTORY J1-1 J1-5 H5-PC NO JUMPER Early H5E, H5X, H10X Install jumper thru ver . 1.04 J3-1 J3-5 J5-1 J4-1 J6-1 NO TE: no jumper used on an y Model star ting with ver . 1.08 J2 J7 MAIN CONTROL BOARD 1 2 3 4 + - + - USED ON H5X ONL Y PINK-22 BLK-24 WHI-24 T ANK t° 39333.000 ...
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Bunn H5X - page 21
42311 071310 21 BLU-14 BLK-14 BLK-14 T ANK HEA TER BLK-14 LIMIT THERMOST A T 200-240 VOL TS AC 2 WIRE + GND SINGLE PHASE USED ON H5X ONL Y RELA Y N.O. COM 3 1 5 4 2 F ACT ORY J1-1 J1-5 H5-PC NO JUMPER Early H5E, H5X, H10X Install jumper thru ver . 1.04 J3-1 J3-5 J5-1 J4-1 J6-1 NO TE: no jumper used on any Model star ting with ver . 1.08 J2 J7 MAIN ...
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Bunn H5X - page 22
42311 071310 22 USED ON H5X ONL Y RELA Y N.O. COM 3 1 5 4 2 F ACTORY J1-1 J1-5 H5-PC NO JUMPER Early H5E, H5X, H10X Install jumper thru ver . 1.04 J3-1 J3-5 J5-1 J4-1 J6-1 NO TE: no jumper used on any Model star ting with ver . 1.08 J2 J7 MAIN CONTROL BOARD 1 2 3 4 + - + - 100-120 VOL TS AC or 200-240 VOL TS AC 2 WIRE + GND SINGLE PHASE PINK-22 GRN ...
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Bunn H5X - page 23
42311 050511 23 RELA Y 3 1 5 4 2 J1-1 J1-5 J3-1 J3-5 J5-1 J4-1 J6-1 J7 PINK-22 GRN-18 WHI/BLU-18 T ANK t° MAIN CONTROL BOARD 1 2 3 4 0-13.8V AC 0-3.3VDC 0-3.3VDC GRY GRY t ° + - + - WHI/VIO-14 RED-18 BLU-14 BLU-14 RED-18 BLK-14 BLK-18 BLK-18 L1 L2 RED RED BLK-18 OVERFLOW PROTECTION SWITCH BLK-14 T ANK HEA TER BLK-14 LIMIT THERMOST A T LIMIT THERM ...
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Bunn H5X - page 24
42311 050511 24 RELA Y J1-1 J1-5 J3-1 J2-1 J4-1 J2 MAIN CONTROL BOARD 1 2 3 4 + - + - USED ON H5X ONL Y 100-240V AC 2 WIRE + GND SINGLE PHASE PINK BLK WHI T ANK t° 44657.0000B 05/11 ©2011 BUNN-O-MA TIC CORPORA TION GRY GRY t ° STEAM SENSOR TEMP PROBE + - SCHEMA TIC WIRING DIAGRAM H5 ELEMENT GRN/YEL L1 RED WHI/BLU BRN/WHI WHI/RED T ANK HEA TER L2 ...
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