Bunn OT Service Manual Page 12
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- TROUBLESHOOTING
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Page 12
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 brew timer, and control thermostat are lo-
cated behind the front panel, FIG. 1 located beneath
the brew funnel, attached with four #8-32 slotted-head
screws.
The base warmer(s), switch(es), indicator lamp,
start switch, tank "keep warm" heater, terminal block,
and solenoid valve, 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 lid. Access is gained by removing the top
lid, FIG. 1 attached with three #8-32 slotted head
screws. On the model OT, the upper warmer, switch,
and associated indicator lamp are located on this re-
movable top lid.
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
Brew Timer (Early Models) ...................................13
Digital Timer (Late Models) .................................. 14
Control Thermostat...............................................16
Warmer(s)
OT:
Brew Station & Upper ............................................. 17
RT: Left Rear, Left Front, Brew Station, & Right Front ... 17
RT:
Right Rear Three Heat ............................................. 18
Warmer Switch(es)
OT: On/Off Brew Station & Upper .................................. 19
RT:
On/Off Brew Station ................................................ 19
RT: Left Rear, Left Front, & Right Front Rotary.............. 20
RT:
Right Rear Three Heat Rotary ................................. 21
Indicator Lamp(s) ................................................. 22
Limit Thermostat .................................................. 23
Solenoid Valve ......................................................24
Start Switch ..........................................................25
Tank Heater ........................................................... 26
Thermal Cut-off ................................................... 27
Wiring Schematics............................................... 28
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P1687
P1688
10021 071700
- OT & RT 1
- CONTENTS 2
- INTRODUCTION 2
- WARRANTY 2
- USER NOTICES 3
- PLUMBING REQUIREMENTS 4
- ELECTRICAL REQUIREMENTS 4
- INITIAL SETUP 5
- ADJUSTING BREW VOLUMES 6
- OPERATING CONTROLS 6
- COFFEE BREWING 7
- CLEANING 7
- TROUBLESHOOTING 8
- 10021 071700 10
- Wiring Diagrams 14
- 120 VOLTS AC 2 WIRE 28
- 120/240 VOLTS AC 3 WIRE 28
- SINGLE PHASE 28
- SCHEMATIC WIRING DIAGRAM OT 29
- 240 VOLTS AC 30
- 50-60 HZ 30
- 100 VOLTS AC 31
- SCHEMATIC WIRING DIAGRAM RT 33
- SCHEMATIC WIRING DIAGRAM RTA 34
- 200 VOLTS AC 36
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