Bunn OL Installation & Operating Manual Download

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Page 13

FIG. 1 ACCESS PANELS

SERVICE

This section provides procedures for testing and replacing various major components used in this brewer

should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any

problem.
Component Access

WARNING - Disconnect the brewer from the power

source before the removal of any panel or the replace-

ment of any component.

The control thermostat, solenoid valve and relay

are located under the top cover or top warmer hous-

ing, FIG. 1, attached with three #8-32 slotted-head

screws.

The base warmer(s), switch(es), indicator lamp,

start switch, tank “keep warm” heater and terminal

block are located in the base. Access is gained by

removing the rear panel, FIG. 1 attached with two

#8-32 slotted-head screws

The limit thermostat and tank heater are located

on the tank assembly. Access is gained by removing

the rear panel, FIG. 1 attached with two #8-32 slotted

head screws.

On the model OL, the upper warmer, switch, and

associated indicator lamp are located on the removable

top warmer housing, FIG. 1.

WARNING - Inspection, testing, and repair of electri-

cal equipment should be performed only by qualified

service personnel. The brewer should be disconnected

from the power source when servicing, except when

electrical tests are required and the test procedure

specifically states to connect the brewer to the power

source.

Contents

Control Thermostat ............................................... 13

Warmer(s)

OL:

Brew Station & Upper ..............................................

RL:

Left Rear, Left Front, Brew Station,

Right Rear & Right Front ............................................

Warmer Switch(es)

OL:

On/Off Brew Station & Upper ...................................

RL:

On/Off Brew Station .................................................

RL:

Left Rear, Left Front, Right Rear

& Right Front Rotary ..................................................

Start Switch .......................................................... 17

Indicator Lamp(s) ................................................. 18

Limit Thermostat ................................................... 19

Solenoid Valve ...................................................... 20

Relay .................................................................... 21

Tank Heater ........................................................... 22

Over Flow Safety Switch ....................................... 23

Master ON/OFF Switch .......................................... 24

Wiring Schematics .............................................. 25

P1712

P1713

32430 010308

Summary of Contents for OL

Page 1: ...he latest revision of the Operating Manual or to view the Illustrated Parts Catalog Programming Manual or Service Manual please visit the Bunn O Matic website at www bunn com This is absolutely FREE and the quickest way to obtain the latest catalog and manual updates For Technical Service contact Bunn O Matic Corporation at 1 800 286 6070 32430 0000D 05 12 1999 BUNN O MATIC CORPORATION ...

Page 2: ...ions 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 If BUNN determines in its sole discretion that the equipment does not conform to the warranty BUNN at its exclusive op tion while the equipment is under warranty shall either 1 provide at no cha...

Page 3: ... thermostat or connecting appliance to power source Use only on a properly protected circuit capable of the rated load Electrically ground the chassis Follow national local electrical codes Do not use near combustibles FAILURE TO COMPLY RISKS EQUIPMENT DAMAGE FIRE OR SHOCK HAZARD READ THE ENTIRE OPERATING MANUAL BEFORE BUYING OR USING THIS PRODUCT THIS APPLIANCE IS HEATED WHENEVER CONNECTED TO A P...

Page 4: ...has been hooked up the brewer is ready for Initial Set Up MODELS OLA RLA OL35B RL35B require 2 wire ground ed service rated 240 volts ac or 200 volts ac 20 amp single phase 50 Hz MODEL OL25B requires 2 wire grounded service rated 100 volts ac 20 amp single phase 50 Hz 32430 051512 L2 RED L1 BLACK 200 230 or 240V A C CE REQUIREMENTS This appliance must be installed in locations where it can be over...

Page 5: ... of the hole made in the supply line by this type of device may restrict water flow As directed in the International Plumbing Code of the International Code Council and the Food Code Manual of the Food and Drug Administration FDA this equipment must be installed with adequate backflow pre vention to comply with federal state and local codes For models installed outside the U S A you must comply wi...

Page 6: ...er source 8 Remove the top panel 9 Rotate the control thermostat knob fully clock wise to the ON position and replace the panel 10 Connect the brewer to the power source and wait approximately twenty minutes for the water in the tank to heat to the proper temperature Some water will drip from the funnel during this time this is due to expansion and should not occur thereafter 11 Place an empty dec...

Page 7: ...the switch in the upper position supplies power to the upper warmer Placing the switch in the lower position cuts power to the upper warmer E Upper Warmer Indicator Lamp Glows whenever the upper warmer switch is in the upper position showing that the warmer is on F Left Rear Warmer Rotary Switch Rotating the knob to the ON position supplies power to the left rear warmer Rotating the knob to the OF...

Page 8: ...rounds and filter CLEANING 1 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 2 Check and clean the sprayhead The sprayhead holes must always remain open 3 With the sprayhead removed insert the deliming spring provided all the way into the sprayhead tube When inserted properly no more than two inches of spri...

Page 9: ...s have 120 volt ac voltage on their terminals Shorting of terminals or the application of external voltages may result in equipment failure Intermittent operation of electronic equipment is unlikely Component failure will normally be permanent If an inter mittent condition is encountered the cause will likely be a switch contact or a loose connection at a terminal or crimp Solenoid removal require...

Page 10: ...Brew Station Warmer Switch for testing procedures See page 15 Refer to Service Start Switch for testing procedures See page 17 Refer to Service Relay for testing procedures See page 21 Refer to Service Solenoid Valve for testing procedures See page 20 Refer to Service Solenoid Valve for testing procedures See page 20 Refer to Service Start Switch for testing procedures See page 17 Refer to Service...

Page 11: ...ed to wrong voltage 1 Improper water pressure 2 Syphon system 1 Syphon system 2 Solenoid Valve Remedy Refer to Service Control Thermo stat for testing procedures See page 13 Inspect the tank assembly for ex cessive lime deposits Delime as required Refer to Electrical Requirements Page 4 Check the operating water pressure to the brewer It must be between 20 and 90 psi Water should flow freely from ...

Page 12: ...er filter should be centered in the funnel and the bed of coffee leveled by gentle shaking Place a funnel over an empty de canter on the warmer beneath the sprayhead Place the On Off brew station warmer switch in the upper position press the start switch and check the water temperature immediately below the sprayhead with an accurate thermometer The reading should not be less than 195 F Adjust the...

Page 13: ...on the tank assembly Access is gained by removing the rear panel FIG 1 attached with two 8 32 slotted head screws On the model OL the upper warmer switch and associated indicator lamp are located on the removable top warmer housing FIG 1 WARNING Inspection testing and repair of electri cal equipment should be performed only by qualified service personnel The brewer should be disconnected from the ...

Page 14: ...source The indication must be as described in step 2 Voltage must not be indicated across these terminals when the thermostat is turned OFF fully counterclockwise 5 Disconnect the brewer from the power source If voltage is present as described the control thermo stat is operating properly If voltage is not present as described replace the control thermostat Removal and Replacement 1 Remove the top...

Page 15: ...to the splice or indicator lamp using the chart below If continuity is present as described proceed to 6 If continuity is not present as described refer to the Wiring Diagrams and check the brewer wiring har ness 6 Check for continuity across the two terminals on the warmer If continuity is present as described the warmer is operating properly If continuity is not present as described replace the ...

Page 16: ...rom the switch terminals 3 Refer to FIG 9 when reconnecting the wires 4 Push the new switch firmly into the opening Location These switches are located beneath and to the left of their associated warmers as viewed from the front FIG s 7 and 8 Test Procedure 1 Locate the switch terminal with black wires that do not go to the nearby indicator lamp 2 Check the voltage across this terminal and the ter...

Page 17: ...erminal 1 and the white or red wire on the terminal block with a voltmeter when the switch is in the ON position Connect the brewer to the power source The indication must be as described in step 1 Voltage must not be present across these terminals in the OFF positions 4 Disconnect the brewer from the power source If voltage is present as described the switch is operat ing properly If voltage is n...

Page 18: ...the lower position Continuity must not be present across these terminals in the upper position If continuity is present as described reconnect the wires the switch is operating properly If continuity is not present as described replace the switch Removal and Replacement 1 Remove all wires from the switch terminals 2 Compress the clips inside the housing and gently push the switch through the openi...

Page 19: ...black wire from the switch to the indicator lamp 2 Check continuity of the white or red wire from the indicator lamp to the terminal block If continuity is present proceed to 3 If continuity is not present refer to Wiring Diagrams and check brewer wiring harness 3 Check for voltage across the indicator lamp ter minals Connect the brewer to the power source The indication must be a 120 volts ac for...

Page 20: ...The limit thermostat is located on the back of the tank assembly FIG 18 Test Procedure 1 Disconnect the brewer from the power source 2 Check voltage across the black wire from the limit thermostat and the white or red wire on the tank heater terminal Connect the brewer to the power source The indication must be a 120 volts ac for two wire 120 volt models b 200 or 240 volts ac for two wire 200 volt...

Page 21: ...d valve and save to mount the new valve 8 Securely install the new solenoid valve to the mounting bracket with two 10 32 screws Check the direction of flow arrow on the valve It must be pointing toward the tank inlet tube 9 Securely attach the valve and bracket to the com ponent bracket using the two 8 32 screws 10 Securely fasten the water lines to and from the solenoid valve 11 Refer to FIG 21 w...

Page 22: ...inal from the relay to the solenoid jumper wire Check the voltage across the pins of the black wire P3 and white wire P2 on the relay with a voltmeter when the On Off brew station warmer switch is in the upper ON position Connect the brewer to the power source The indication must be as described in step 1 6 Disconnect the brewer from the power source 7 Check the voltage across the pins of the blue...

Page 23: ...the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid 15 Refer to FIG 24 when reconnecting the wires 16 Refer to Initial Setup to refill the tank Location The tank heater is located in the bottom of the tank assembly FIG 23 Test Procedure 1 Check the voltage across the black and white or red wires on the tank heater with a voltmeter when the ...

Page 24: ... the float is lowered again 7 Check for continuity across the water level switch pink wires only until the plastic float is raised and check that continuity returns when the float is lowered again If continuity is present as described reconnect the wires as shown in FIG 30 the switches are operating properly If continuity is not present as described replace the failed switch Removal and Replacemen...

Page 25: ...s on the switch at L2 RED and RED to Main Harness when it is held in the lower position Continuity must not be present across these terminals in the upper position If continuity is present as described reconnect the wires the switch is operating properly If continuity is not present as described replace the switch Removal and Replacement 1 Remove all wires from the switch terminals 2 Remove the tw...

Page 26: ...C 3 WIRE GND SINGLE PHASE 60 HZ RED TANK HEATER BLK BLK BLK WHI P3 WHI P2 WHI KEEP WARM HEATER WHI WHI WHI BLK SAFETY SW LEVEL SW PNK BLU SOL K1 P3 P1 P2 WHI BLK BLU WHI P3 P1 P2 BLU WHI K1 N O PNK PNK BLK PNK BLK BLK BLK BLU UPPER WARMER BREW STATION WARMER SOL BLK WHI VIO BR RECT OPTIONAL LOW WATER PRESSURE VALVE P1 P2 P3 ARE PINS OF A POLARIZED THREE PIN CONNECTOR BLK L1 L2 BLK RED N MAIN ON OF...

Page 27: ...VOLTS AC 2 WIRE SINGLE PHASE 50 60 HZ RED TANK HEATER BLK BLK BLK RED P3 WHI P2 RED KEEP WARM HEATER WHI WHI WHI BLK SAFETY SW LEVEL SW PNK BLU SOL K1 P3 P1 P2 RED BLK BLU WHI P3 P1 P2 BLU WHI K1 N O PNK PNK BLK PNK BLK BLK BLK BLU UPPER WARMER BREW STATION WARMER SOL BLK WHI VIO BR RECT OPTIONAL LOW WATER PRESSURE VALVE P1 P2 P3 ARE PINS OF A POLARIZED THREE PIN CONNECTOR 32430 121699 ...

Page 28: ...P2 WHI BLK LEVEL SW PNK BLU SOL K1 P3 P1 P2 BLK BLU WHI P3 P1 P2 BLU WHI K1 N O PNK PNK BLK PNK BLK BLK BLK BLU P1 P2 P3 ARE PINS OF A POLARIZED THREE PIN CONNECTOR UPPER WARMER BREW STATION WARMER BLK BLU LIMIT THERMOSTAT L1 BLK GRN YEL N TANK HEATER SW THERMOSTAT K2 K2 N O K2 N O BLK 12 BLK 12 10639 0000C 10 98 1991 Bunn O Matic Corporation HEATER INDICATOR T1 L1 L2 T2 OVERFLOW PROTECTION SW 324...

Page 29: ...K BLK BLK P3 P2 RED WHI BLK SAFETY SW LEVEL SW PNK BLU SOL K1 P3 P1 P2 RED BLK BLU WHI P3 P1 P2 BLU WHI K1 N O PNK PNK BLK PNK BLK BLK BLK BLU P1 P2 P3 ARE PINS OF A POLARIZED THREE PIN CONNECTOR UPPER WARMER BREW STATION WARMER SOL BLK WHI VIO BR RECT OPTIONAL LOW WATER PRESSURE VALVE SW IND WHI RED IND SW BLU READY INDICATOR BLK SW THERMOSTAT WHI NOT A PURCHASED SCHEMATIC FOR REFERENCE ONLY BLK ...

Page 30: ... HZ WHI VIO BREW SW BLK BLK BLK WHI WHI WHI BLK SAFETY SW LEVEL SW PNK BLU SOL K1 P3 P1 P2 WHI BLK BLU WHI P3 P1 P2 BLU WHI K1 N O PNK PNK BLK PNK BLK BLK BLK BLU P1 P2 P3 ARE PINS OF A POLARIZED THREE PIN CONNECTOR BREW STATION WARMER SOL BLK WHI VIO BR RECT OPTIONAL LOW WATER PRESSURE VALVE KEEP WARM HEATER WHI WHI OFF ON OFF ON L1 1 OFF ON OFF ON L1 1 OFF ON OFF ON L1 1 BLK BLK RIGHT REAR WARME...

Page 31: ... BLK BLK PNK BR RECT VIO WHI VIO SOL BLK WHI OPTIONAL LOW WATER PRESSURE VALVE WHI BLK SAFETY SW LEVEL SW PNK BLU SOL K1 P3 P1 P2 RED BLK BLU WHI P3 P1 P2 BLU WHI K1 N O PNK BLK PNK BLK BLK BLU BREW SWITCH RED BLK RED BLK RED BLK LEFT REAR WARMER OFF ON OFF ON L1 1 BLK LEFT FRONT WARMER OFF ON OFF ON L1 1 BLK RIGHT FRONT WARMER OFF ON OFF ON L1 1 BLK RED BLK RIGHT REAR WARMER OFF ON OFF ON L1 1 BL...

Page 32: ...PHASE 60 HZ BREW SW BLK BLK BLK RED RED WHI BLK SAFETY SW LEVEL SW PNK BLU SOL K1 P3 P1 P2 RED BLK BLU WHI P3 P1 P2 BLU WHI K1 N O PNK PNK BLK PNK BLK BLK BLK BLU P1 P2 P3 ARE PINS OF A POLARIZED THREE PIN CONNECTOR TANK HEATER BREW STATION WARMER BLU READY INDICATOR BLK SW THERMOSTAT LEFT REAR WARMER LEFT FRONT WARMER RIGHT FRONT WARMER IND OFF ON OFF ON L1 1 OFF ON OFF ON L1 1 OFF ON OFF ON L1 1...

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