Thermal Cut-Off; Timer (Early Models) - Bunn U3 Operating & Service Manual

SERVICE (cont.)
THERMAL FUSES (230V-CE MODELS ONLY)
FIG. 28 THERMAL FUSES
Location:
The thermal fuses are mounted on the tank heater
terminals and the contactor terminals.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the thermal fuse from the tank heater
terminal and the contactor terminal.
3. Check for continuity across the terminals on the
ends of the thermal fuse.
If continuity is present as described, the thermal is
operating properly.
If continuity is not present as described, replace the
thermal fuse.
Removal and Replacement:
1. Disconnect the thermal fuse from the tank heater
terminal and the contactor and discard.
2. Connect the new thermal fuse to the tank heater
terminal and the contactor terminal.

TIMER (Early Models)

P1750.65
Location:
The timer is located on the front center of the
component bracket.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the polarized, three pin connector from
the brewer main harness and rotate the brew timer
dial fully counterclockwise.
3. With a voltmeter, check the voltage across sockets
P2 and P3 (white and black wire or red wire) of
the female connector on the main wiring harness
when the "ON/OFF" switch is in the "ON" (upper)
position. Connect the brewer to the power source.
The indication must be:
a) 120 volts ac for three wire 120/208 volt, 120/240
volt, 380 volt models and 208 or 240 volts ac for
four wire 440 volt models.
b) 208 volts ac for two and three wire 208 volt
models.
c) 240 volts ac for two and three wire 240 volt
models.
d) 230 volts ac for two wire 230 volt CE models.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the Wiring
Diagrams and check the brewer wiring harness.
Page 31
OLD STYLE
FIG. 29 TIMER
P1722.55
10060 080900