Bunn OT Service Manual

OT & RT10021.0000G 7/00 © 1989 BUNN-O-MATIC CORPORATIONBUNN-O-MATIC CORPORATIONPOST OFFICE BOX 3227SPRINGFIELD, ILLINOIS 62708-3227PHONE:

Page 10TROUBLESHOOTING (cont.)ProblemSpitting or unusual steaming fromsprayhead.Inconsistent beverage level in de-canter.Consistently high or low beve

Page 11TROUBLESHOOTING (cont.)ProblemBeverage overflows decanter.Weak beverage.Brewer is making unusual noises.Probable Cause1. Beverage left in decan

Page 12FIG. 1 ACCESS PANELSSERVICEThis section provides procedures for testing and replacing various major components used in this brewershould servic

Page 13FIG. 2 BREW TIMERFIG. 3 BREW TIMER WIRINGSERVICE (cont.)Brew Timer (Early Models)Location:The brew timer is located behind the front panelto th

Page 14TL5TL4TL3TL2TL1J2SET LOCKLOCKSETJ1DIGITAL BREW TIMER (Late Models)P2201FIG. 4 DIGITAL BREW TIMERLocation:The timers are located inside the

Page 153. Remove all wires from the timer.4. Attach all wires to the replacement timer boardprior to installation to the component mountingbracket. R

Page 16FIG. 6 CONTROL THERMOSTATFIG. 7 THERMOSTAT WIRINGSERVICE (cont.)Control ThermostatLocation:The control thermostat is located behind the frontpa

Page 17FIG. 8 WARMERSFIG. 9 WARMERS FIG. 10 WARMER WIRINGSERVICE (cont.)Warmer(s)OT: Brew Station & UpperRT: Left Rear, Left Front, Brew Station,

Page 18FIG. 11 THREE HEAT WARMERFIG. 12 THREE HEAT WARMER WIRINGSERVICE (cont.)WarmerRT: Right Rear Three HeatIf continuity is present as described, p

Page 19FIG. 13 WARMER SWITCHESFIG. 14 WARMER SWITCHESFIG. 15 WARMER SWITCH WIRINGSERVICE (cont.)Warmer Switch(es)OT: On/Off Brew Station & UpperRT

Page 2CONTENTSIntroduction ... 2User Notices ...

Page 20FIG. 16 WARMER SWITCHESFIG. 17 WARMER SWITCH WIRINGSERVICE (cont.)Warmer Switch(es)RT: Left Rear, Left Front, & Right FrontLocation:These w

Page 21FIG. 18 THREE HEAT WARMER SWITCHFIG. 19 THREE HEAT WARMER SWITCH WIRINGSERVICE (cont.)Warmer Switch(es)RT: Right Rear Three Heat Rotary5. Check

Page 22FIG. 22 INDICATOR LAMP WIRINGFIG. 20 INDICATOR LAMP - MODEL OTFIG. 21 INDICATOR LAMP - MODEL RTSERVICE (cont.)Indicator Lamp(s)c) 100 volts ac

Page 23FIG. 23 LIMIT THERMOSTATFIG. 24 LIMIT THERMOSTAT WIRINGSERVICE (cont.)Limit Thermostat4. Check for continuity across the limit thermostattermin

Page 24FIG. 25 SOLENOID VALVEFIG. 26 SOLENOID VALVE WIRINGSERVICE (cont.)Solenoid Valve4. Check the solenoid valve for coil action. Con-nect the brew

Page 25FIG. 28 START SWITCH - MODEL RTFIG. 27 START SWITCH - MODEL OTFIG. 29 START SWITCH WIRINGSERVICE (cont.)Start SwitchLocation:The start switch i

Page 26FIG. 30 TANK HEATERFIG. 31 TANK HEATER WIRINGSERVICE (cont.)Tank HeaterRemoval and Replacement:1. Remove the wires to the tank heater and limit

Page 27Thermal Cut-offLocation:The thermal cut-off is located on the tank heater, FIG.32.SERVICE (cont.) Test Procedures:1. Disconnect the brewer fro

Page 28WHI/GRNWHI/BLUBLKBREW STATION WARMERWHIBLU BLU/BLKWHI WHIBREWTIMERBLKBLKP1P3P2SCHEMATIC WIRING DIAGRAM OTBLKBLKBLKWHIP1, P2, & P3 ARE PINS

Page 29BLKPNKGRYBLKBLKBLULIMITTHERMOSTATNL1BLKBREW STATION WARMER130WWHIBLU BLU/BLKWHIWHIBLKBLKP1P3P2GREENSCHEMATIC WIRING DIAGRAM OTBLKL2BLKBLKWHIP1,

Page 300656.000000688.0000WARNING!HIGH HEAT WARMERDO NOT BOIL DECANTER DRYKEEP COMBUSTIBLES AWAYFAILURE TO COMPLY RISKSGLASS FAILURE/HOT LIQUIDBURNS A

Page 30BLKBLKBLKBLULIMITTHERMOSTATSW. &THERMOSTATL1BLKBREW STATION WARMERBLU BLU/BLKBLKBLKP1P3P2GRN/YELBLKL2BLKBLKP1, P2, & P3 AREPINS OF APOL

Page 31BLKBLKBREW STATION WARMERBLU BLU/BLKBLKBLKP1P3P2SCHEMATIC WIRING DIAGRAM OT25BBLKBLKBLKP1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNE

Page 32BLKBLKBLKBLULIMITTHERMOSTATL1BLKBREW STATION WARMERBLUBLU/BLKBLKBLKP1P3P2GRN/YELSCHEMATIC WIRING DIAGRAM OT35BBLKL2BLKBLKP1, P2, & P3 AREPI

Page 33BLKWARMERWHIBLKSCHEMATIC WIRING DIAGRAM RTBLKWHI"KEEP WARM" HEATERWHI10277.0000D 7/00 © 1988 BUNN-O-MATIC CORPORATION120/240

Page 34BLKBLULIMITTHERMOSTATSW. &THERMOSTATTANK HEATERBLKL1BLKWARMERBLUBLKBLKP310283.0000C 7/00 © 1988 BUNN-O-MATIC CORPORATIONGRN/YELSCHE

Page 35BLKWARMERBLUBLKBLKP3SCHEMATIC WIRING DIAGRAM RT25BBLKBLKBLKP1, P2, & P3 AREPINS OF APOLARIZEDTHREE-PINCONNECTOR. BLK BLKBLK BLKBLK BLKLEFT

Page 36BLKBLULIMITTHERMOSTATTANK HEATERBLKL1BLKWARMERBLUBLKBLKP3GRN/YELSCHEMATIC WIRING DIAGRAM RT35BBLKL2REDBLKBLKP1, P2, & P3 AREPINS OF APOLARI

Page 4MODELS OT15 & 20 require 2-wire, grounded service rated120 volts ac, 15 or 20 amp re-spectively, single phase, 60 Hz.Model 15 has an attache

Page 5PLUMBING REQUIREMENTS (Cont.)Plumbing Hook-UpModel OT15 has an attached water strainer, proceed to step 2.Models OT20, OT35, & RT35, proceed

Page 6MODEL RTCAUTIONDISCARD DECANTERIF:. CRACKED. SCRATCHED. BOILED DRY . HEATED WHEN EMPTY. USED ON HIGH FLAME. OR EXPOSED ELECTRIC ELEMENTSFAILURE

Page 7MODELS OT & RTA. On/Off Brew Station Warmer SwitchPlacing the switch in the upper position suppliespower to the brew station warmer and enab

Page 8ProblemEquipment will not operate.Brew cycle will not start.Probable Cause1. No power or incorrect voltage1. No water2. Water Strainer3. Flow Co

Page 9TROUBLESHOOTING (cont.)ProblemBrew cycle will not start. (cont.)Water flows into tank continuously(On/Off brew station warmer switch"OFF&qu