BUNN ® D B ISC E R FO ON W E R N P A LA E EC R C RE T E M F N M O R IN E V O N A M G T L P O F OF OW A A E N N R Y Y S C P O O A U M N R P E C O L E N O E R N T! H5E H5X ! G IN RN ter WAt Wa e! ! Ho ar ry h C Ve Wit e Us OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 10420.
CONTENTS Introduction ................................................. 2 Warranty ...................................................... 2 User Notices ................................................ 3 Electrical Requirements ............................... 4 Plumbing Requirements .............................. 4 Initial Set-Up ................................................ 5 Draining the Dispenser ................................ 5 Cleaning .......................................................
USER NOTICES The notices on this dispenser should be kept in good condition. Replace unreadable or damaged labels. 12593.0000 00831.0000 00656.0000 10044.
ELECTRICAL REQUIREMENTS CAUTION - The dispenser must be disconnected from the power source until specified in Initial Set-Up. This dispenser requires 2-wire, grounded service rated 120, 208, or 240 volts ac, 20 amp, single phase. (Refer to the dispenser’s dataplate for exact voltage requirement.) Electrical Hook-Up CAUTION – Improper electrical installation will damage electronic components. WHITE NEUTRAL L1 BLACK 120V.A.C. 1. 2. 3. 4. 5. L2 RED 208 or 240V.A.C. L1 BLACK 6.
INITIAL SET-UP CAUTION - The dispenser must be disconnected from the power source throughout the initial set-up, except when specified in the instructions. 3. 4. 5. 6. DO ! CA UT IO N ON N O N P TICE Un OT til W Tu OFFSTONO ate rn O AD r RE Au Hot W Co n Th tom a me e T a te s F an Co ticall r Sys k ro m O Hea Ac ffee y W tem co pe ter rda Bre hen U s – W w Fa nce W ers nit Is ater ned Swit Fa ch ilu – re ith Th Fill TConn Tank u To e In he ecte Wil cet! W d lF C s N 2.
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.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Automatic refill will not operate 1. No water after drawing hot water. 2. Water strainer/flow control Check plumbing and shut-off valves. (A) Direction of flow arrow must be pointing 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 17. 4.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Water boils continuously. 1. Temperature control Refer to Service – electronic controls for testing procedures. See page 10. 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.
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. DO N O R E S A T D O N P O TI C E O N WAR NING RD LT OU AG S E NNE NCE OR MA RRA NUA 00831 CTE IS USI .
SERVICE (cont.) Electronic Controls .
tronic control assembly. 5. Check the voltage across terminals 1 & 4 of the electronic control assembly with a voltmeter. Connect the dispenser to the power source. The indication must be: a.) 100 to 120 volts ac for 100 to 120 voltmodels or b.) 200 to 240 volts ac for 200 to 240 volt models after a delay of approximately 5 seconds. 6. Disconnect the dispenser from the power source. SERVICE (cont.) Electronic Controls (cont.) Liquid Level Control Test Procedure 1.
SERVICE (cont.) If voltage was present as described, reinstall the probe, the sensing function of the system is operating properly. If voltage was not present as described, check the pink probe wire and the green ground wire for continuity and/or replace the probe. Electronic Controls (cont.) 7. Reconnect the pink wire to terminal 5 of the electronic control assembly. 8. Loosen the compression fitting, remove the probe from the tank lid, and inspect it for mineral deposits. Replace it if necessary.
SERVICE (cont.) Electronic Controls (cont.) to a temperature sensor. Both components MUST be replaced as a set. 10. Check the voltage across the tank heater terminals 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 models or b.) 200 to 240 volts ac for 200 to 240 volt models while the red indicator on the circuit board is on or blinking. 11. Disconnect the dispenser from the power source.
SERVICE (cont.) 8. Reconnect the wires. 9. Review the initial set-up procedures. Electronic Controls (cont.) Electronic Controls Removal and Replacement Triac Assembly Removal and Replacement NOTE - Each electronic control assembly is calibrated to a temperature sensor probe. Both components MUST be replaced as a set. NOTE - Each triac installation requires the use of an approved silicone heat sink compound. Bunn-O-Matic recommends the use of Dow Corning 340 compound or equivalent.
4. Take the temperature of the stream of water immediately below the faucet as it flows from the dispenser with an accurate thermometer. Do not take the temperature of water collected in a container. SERVICE (cont.) Electronic Controls (cont.) Adjustments 5A. TO INCREASE THE TEMPERATURE Turn the potentiometer screw of the temperature range selected in step 2 in a clockwise direction with a small screwdriver. One full turn of the screw will result in an approximate 1°F change.
SERVICE (cont.) Limit Thermostat Location: The limit thermostat is located on the tank lid. To 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 Wiring Diagrams and check the dispenser wiring harness. 5. Check for continuity across the terminals of the limit thermostat.
SERVICE (cont.) Removal and Replacement: 1. Disconnect the black wires from the safety overflow switch. 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.) 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 after approximately 5 seconds, as the coil magnet attracts the plunger. 8. Disconnect the dispenser from the power source. 9. Reconnect the pink wire to terminal 5 of the electronic control assembly. Solenoid Valve Location: The solenoid valve is located inside the rear of the dispenser on the right side near the bottom.
SERVICE (cont.) IC E A D N N BLU to Triac Assy P1772 P OFFSTO T ON N E IO R UT Removal and Replacement: 1. Remove the wires to the tank heater. 2. Remove the 8-32 nuts from the tank heater flange. 3. Remove the tank heater. 4. Inspect the tank heater gasket and replace if necessary. 5. Securely install the new tank heater. Be certain of a watertight seal. 6. Reconnect the wires, FIG. 13.
WIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM H5X L1 N GRN BLK W H HEATER I PNK REFILL PNK G R Y LIMIT THERMOSTAT BLK W H t° I BLK GRY GRY READY G R Y SAFETY SW RED RED 100-120 VOLTS A C 2 WIRE SINGLE PHASE TAN BLU WHI/BRN 7 6 PNK 20 (PROBE) ELECTRONIC5 4 CONTROL 3 ASSY 2 PNK WHI/VIO TANK HEATER TANK HEATER SW GRY PNK POWER TRIAC BLU WHI WHI/BLU 1 SOL WHI GRN G R Y BLK t° 10410.
WIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM H5E L1 N GRN LIMIT THERMOSTAT BLK TRIAC W HEATER H PNKI REFILL PNK G R Y TANK HEATER SW PNK GRY BLK GRY READY SAFETY SW RED RED 100-120 VOLTS A C 2 WIRE SINGLE PHASE L1 BLK W HEATER H PNK I REFILL PNK G R Y 200-240 VOLTS A C 2 WIRE SINGLE PHASE WHI WHI/BLU SOL WHI GRN GRN/YEL LIMIT THERMOSTAT BLK BLU TANK HEATER W H TAN t° I BLU 7 WHI/BRN TANK 6 HEATER SW 5 4 ELECTRONIC 3 CONTROL 2 1 ASSY PNK BLK PNK 20 (PROBE) 10331.
