Table Of Contents - Bunn U3 Operating & Service Manual

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.
WARNING - Inspection, testing, and repair of electri-
cal equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are re-
quired and the test procedure specifically states to
plug in the brewer.
COMPONENT ACCESS
WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replace-
ment of any component.
All components are accessible by the removal of
the swing spout, front cupola cover, rear cupola cover
and the cupola.
Disconnect the swing spout nut from the swing
spout base fitting. Remove swing spout.
Remove the four #8-32 screws, two on the front and
rear, securing front and rear cupola covers to the
cupola.
Slip cupola off of the component bracket.
Circuit Breaker .....................................................14
Contactor ..............................................................15
Control Thermostat ...............................................17
Fuse and Fuse Holder ...........................................18
Limit Thermostat ...................................................19
Liquid Level Board and Level Probe .................... 20
ON/OFF Switch ......................................................22
Pump ....................................................................23
Relay ................................................................... 24
Selector Switch (Half Batch) .................................26
Solenoid ...............................................................27
Start Switch (Brew) ...............................................29
Tank Heater(s) .......................................................30
Thermal Cut-off ................................................... 31
Timer (Early Models).............................................31
Digital Timer (Late Models) ...................................33
Transformer ..........................................................35
Master ON/OFF Switch (Late Models) ...................36
Wiring Diagrams ...................................... 37 thru 42
FIG. 1 COMPONENT ACCESS
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Contents
P1317.30
10060 011708