Bunn Fast Cup Series Service & Repair Manual page 63

LEFT PANEL LEFT PANEL
Water Inline Pressure Sensor (IPS)
Purpose: The water sensor monitors pressure within
the water system. Once system pressure reaches 70
or 120psig; the brewer will momentarily activate the
purge solenoid valve to relieve and maintain system
pressure below 70psig. The very small amount of
water is directed to the drip tray.
TEST INSTRUCTION
Enter Service Technician Mode and Select
Service icon
Step 1: Select and enter the Water System tab. The
water pressure psig can be viewed during
the Water Inline Pressure Sensor voltage
test.
Volt/Ohm Meter - Voltage Check
Step 2: Disconnect or unplug machine from power.
Step 3: Remove right panel to access circuit
boards.
Step 4: Locate J29 connector on the Input/Output
board.
Step 5: Connect power to machine.
Step 6: Set voltmeter on D/C voltage. Install red
meter lead on terminal J29-4 WHI/RED
wire (positive) and black meter lead on
J29-6 WHI/BLK wire (negative) terminal.
Step 7: The reading should be 5.0VDC.
Step 8: Signal Voltage - The voltage reading will
be dependent upon Water System pres-
sure reading. Install red meter lead on
terminal J29-4 WHI/ RED wire (positive)
and the black meter lead on J29-5 BRN/
WHI or Tan wire (negative) terminal.
SERVICE
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