Brew Pressure Sensor (Transducer) - Bunn Fast Cup Series Service & Repair Manual

LEFT PANEL LEFT PANEL
Brew Inline Pressure Sensor (IPS)
Purpose: The sensor monitors brew pressure during
a brew process. The sensor will input data which
may cause a variation in the brew pump motor rpm
to maintain a flow rate.
TEST INSTRUCTION
Enter Service Technician Mode and Select
Service icon
Step 1: Select and enter the Brew Module tab. The
Brew Piston test buttons will move the
piston to a designated mm position point
when touched.
Step 2: Touch Brew Piston Closed button to move
upper piston into brew chamber, creating a
seal. The Piston Status is displayed at the
bottom of the service screen.
Step 3: Exit Brew Module tab and enter the Water
System tab.
Step 4: Touch the Brew Chamber Fill Valve button.
Step 5: Ensure the Brew Pressure reading on the
display increases in pressure during water
flow test (typically no more than 15.0psig)
and returns back to zero pressure after flow
test is completed.
Yes - Brew sensor is operating correctly.
Brew pressure goes above 50 psig during
this particular test.
This could be an indicator that when water
is entering the bottom of the brew chamber
and is trying to flow through the upper
brew piston screen, through the dispense
valve, tubing and out the coffee nozzle,
that a flow restriction has formed some
where in the dispense path (dirty filter
screens or dispense valve) causing rise in
brew pressure.
SERVICE SERVICE
1
2
3
61
2
71 mm
IN CHAMBER
5
196
13.7 PSI
4
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