Wunderbar JoeTap NITCOM Operating instructions

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JT-TFN20M07-110
JoeTap NITCOM Repair
Manual-110V
JoeTap NITCOM Repair Manual -110V Rev C

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TABLE OF CONTENTS
Symptom 1: Screen Blackout Page: 3
Symptom 2: Unit Stuck in Cleaning Cycle Page: 6
Symptom 3: Invalid Voltage Page: 8
Symptom 4: Communication Down Page: 10
Symptom 5: No Product flow Page: 11
Symptom 6: Low Pressure Warning Page: 12
Symptom 7: Lockout Page: 14
Symptom 8: Incorrect Foam Level Page: 14
Symptom 9: Liquid Leaks Inside Refrigerated Space/Rear Enclosure Page: 17
Symptom 10: Tower Leaks Page: 17
•Replacing the Faucet Diaphragm Page: 19
•Replacing the Check Valve Page: 23
Symptom 11: Gas Leak/Generator keeps Turning on Page: 23
Symptom 12: Temperature Reading Out of Acceptable Range Page: 27
•Verify Setpoint Temp Page: 27
•Verify Calibration Setting is correct Page: 27
•Run Built-In Self-Test Page: 29
•Recalibrate NITCOM Fridge Settings Page: 29
•Verify Inverter Is Working/Replace Inverter Page: 31
•Verify Correct Refrigerant Charge Page: 37
Symptom 13: Fridge Light OFF Page: 39
Symptom 14: Fridge Door Coming Off Page: 42
Symptom 15: Fridge LED UI Not Working Page: 42
Appendix A: Oetiker Clamp Application Page: 54
Appendix B: John Guest Troque Settings Page: 54
Appendix C: JoeTap NITCOM Wiring diagram Page: 55
Appendix D: John Guest Speed Fit Guide Page: 56
Appendix E: Software Update Instructions Page: 57
Appendix F: Flowmeter/Solenoid Module Replacement Page: 59
Appendix G: Nitrogen Line Solenoid Replacement Page: 61
Appendix H: Disassembling the Tower Page: 63
•Removing/Uninstalling the Tower Page: 64
•Disassembling the Tower Page: 64
•Disassembling the Elbow Shanks Page: 65
•Reassembling the Tower Page: 67
•Reinstalling the Tower Page: 73
Appendix I: Verify Pressure Transducer Functionality Page: 75
Appendix J: Fridge Functionality, Maintenance, and Troubleshooting Guide Page: 79
•Control Function Guide Page: 79
•Refrigeration System Diagnosis Guide Page: 79
•Refrigeration System Wiring Diagram Page: 81
Appendix K: Fridge Controller Board Replacement Procedure Page: 82
Appendix L: Fridge Thermistor Replacement Procedure Page: 85
NITCOM DISPENSING SYSTEM TROUBLESHOOTING
NITCOM REFRIGERATION SYSTEM TROUBLESHOOTING
APPENDIX

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JoeTap NITCOM Dispensing System Troubleshooting
Symptom 1: Screen Blackout
1. Verify if the rest of the unit is getting power. Open fridge door and check if light/fan/ fridge controller is on:
a. If the entire unit is not getting power (Fridge light/fan/ Touch Screen is OFF):
i. Verify fridge is plugged in.
ii. Check that the wall receptacle has power using DVOM.
iii. Check the High Voltage Power Supply Harness to verify it is connected as per Figure 1a. Remove two
screws from the fridge power plug to check the connections to the plug as seen in Figure 1b.Refer to
Appendix C: JoeTap NITCOM Wiring Diagram for full wiring diagram.
b. If the system is getting power (Fridge light/fan/fridge controller is on and the screen is OFF):
i. Open the door and remove the screen cover and foam to verify that the Display Power Supply Harness is
plugged in. See Figure 2a.If the Display Power Supply Harness is under a lot of tension, cut the cable tie
and remove the tension. The P-Clamp, seen in Figure 2b, at the exit (bottom of door) might need to be
loosened accommodate this. Refer to Appendix C: JoeTap NITCOM Wiring Diagram for full wiring
diagram.
Figure 1a: Power Supply Harness Diagram.
Figure 1b: Main Power Plug.

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ii. If the Screen does not turn on with the Display Power Supply Harness plugged in, verify that there is
24VDC by unplugging the harness and probing the green power connector with a DVOM.
•If there is no power, then remove the Rear Enclosure Panel and check the Power Supply to
ensure the Spade Connectors at the end of the Display Power Supply Harness is screwed into
the Power Supply output as seen in Figure 3a and Figure 3b. Refer to Appendix C: JoeTap
NITCOM Wiring Diagram for full wiring diagram. If loose or disconnected, reconnect and power
the unit to see if the screen is turning on.
•If there is 24VDC at the Power Supply output but no voltage at green connector, the Display
Power Supply Harness is damaged and needs to be replaced.
•If screen is getting power, plug the Display Power Supply Harness back in power cycle the unit. If
the screen does not respond (nothing is seen on the screen), then replace the screen.
•If the screen is initially turning on then going to a black screen (appears to be off but is actually
on with a black screen), there may be an issue with the Ethernet Cable or there is a Software
bug. If all the wires are plugged correctly (and not damaged), verify that the ethernet cable is
undamaged. Bypassing the installed ethernet cable with a known/functioning ethernet cable
would be easiest way to check. If issue persists, update the software. Refer to Appendix F:
Software Update.
Ethernet
Cable
Display
Power Supply
Harness
USB Cable
Loosen P-Clamp if
necessary
Display Power
Supply Harness
Spade Connectors into
Power Supply output
Cable
Tie
Ethernet Cable
Figure 3a: Electrical Compartment- Old USB Location.
Figure 2a: Screen Wiring shown.
Figure 2b: P-Clamp Location.
USB Port
Display Power
Supply Harness
Spade Connectors into
Power Supply output
Ethernet Cable
USB Port
Figure 3b: Electrical Compartment- New USB Location.

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2. If the Display Power Supply Harness is connected and undamaged, verify if the PCB is also not receiving power
(LED lights on the PCB will be lit if it is working):
a. If PCB is NOT receiving power, verify the rest of the connections to the Power Supply seen in Figure 4. The
Brown Wire from the High Voltage Power Supply should be connected to L socket on the Power Supply. The
Blue Wire from the High Voltage Power Supply should be connected to the N socket on the Power Supply.
The Green Wire from the High Voltage Power Supply should be connected to the Ground Socket in the
Power Supply.
b. If the PCB lights are off, a DVOM can also be used to verify that the Power Supply output (-V and +V) have a
24VDC output. See Figure 5.
c. Verify the power input terminal on the PCB itself. If there is power at the Power Supply Output but not at
the PCB, the harness is damaged and needs to be replaced See Figure 5.
d. If the Power Supply output does not have power, check the Power Supply input by probing between the L
and N terminals on the Power Supply. If the reading between the L and N terminals is at wall
output(115VAC-127VAC) but the output has no voltage, the Power Supply is damaged and needs to be
replaced. See Figure 5.
Display Power
Supply Harness
PCB Power
Supply Harness
Figure 4: Power Supply Cables Schematic.
High Voltage
Power Supply
Harness
Probe Here for
24VDC
Probe Here for
120VAC
Figure 5: Probe locations shown.
Probe Here for
24VDC

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e. If the input does not have ~120VAC, remove the Bottom Rear Panel using 5/16-inch Hex Socket Drive to
access the High Voltage Supply Harness (Can be identified by its Blue, Brown, and Green/Yellow wire
strands). Verify that the Harness is not damaged (pinched, pierced, or cut) through the length of the harness
from the black power plug through the Foam Channel under the Rear Enclosure. See Figure 6. You may have
to remove the Black Power Plug to fully inspect the harness. Refer to Appendix C: JoeTap NITCOM Wiring
Diagram for full wiring diagram. Replace the High Voltage Power Supply if damaged.
3. If all the wires are plugged correctly (and not damaged) and the screen is the only electronic component that
does not have power (PCB will have LED lights on), verify that the ethernet cable is undamaged. Bypassing the
installed ethernet cable with a known/functioning ethernet cable would be easiest way to check.
4. If ethernet cable is functional and the screen is getting the power, then replace the screen.
Symptom 2: Unit Stuck in Cleaning Cycle:
1. Remove Rear Enclosure Cover panel by removing the four screws holding it to the Rear Enclosure (two on either
side).
2. Verify that the Solenoid Harness is plugged in correctly. Refer to Appendix C: JoeTap NITCOM Wiring Diagram
for full wiring diagram. The BEVERAGE SOLENOID should have the BLUE and ORANGE quick connects attached
and the NITROGEN SOLENOID should have the BROWN and ORANGE quick connects attached. See Figure 7a and
Figure 7b.
3. Identify the Flow Meter and verify it is plugged in on both ends. One end into the flowmeter, the other on the
PCB. See Figure 7a and Figure 7b. Also verify all other harnesses inside the Rear Enclosure are connected in
proper locations. Refer to Appendix C: JoeTap NITCOM Wiring Diagram for full wiring diagram.
Black
Power Plug
Foam
Channel
High Voltage
Power Supply
Figure 6: High Voltage Power Supply shown with Bottom Rear Panel removed.

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4. Verify that the Flowmeter is functioning:
a. Select MACHINE INFO. See Figure 8a.
b. Open product tap and verify that the TOTAL DISPENSED and DISPENSE RATE readings are changing. See
Figure 8b.
5. If Flowmeter is not reading on the screen, verify that the Flowmeter Harness is correct. The three wires (White,
Black, and Gray) should be in the same sequence on both ends of the connector. If the wire color sequence
differs on both connectors are not the same, replace the Flowmeter Harness and verify the functionality of the
Flowmeter again.
6. If Flowmeter is still not reading, update the software. Refer to Appendix E: Software Update Instructions.
7. If Flowmeter is not reading on the screen after a software update, replace the Flowmeter Solenoid Module and
verify the functionality of the Flowmeter again. Refer to Appendix F: Flowmeter/Solenoid Module Replacement
for procedure.
8. Verify that the Flowmeter is functioning as seen in step 4 above. If the TOTAL DISPENSED AND DISPENSE RATE
readings are changing, verify the problem is fixed by running the cleaning cycle again.
9. If updating the software, Solenoid Harness is plugged in correctly, and replacing the Flowmeter Harness and
Flowmeter Solenoid assembly does not resolve the issue, the problem is with the PCB; replace the PCB.
Flowmeter
Harness into
Flowmeter
Flowmeter
Harness
into PCB
Figure 8b: Machine Info Screen with Total
Dispensed and Dispense Rate circled.
Figure 8a: Home Screen with Machine Info
Circled.
Figure 7a: Flowmeter Harness Shown-Old Configuration.
Figure 7b: Flowmeter Harness Shown-New Configuration.
Flowmeter
Harness into
Flowmeter
Flowmeter
Harness
into PCB
BLUE and
ORANGE
BROWN and
ORANGE
BROWN and
ORANGE
BLUE and
ORANGE

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Symptom 3: Invalid Voltage:
1. If Invalid Voltage is accompanied with Communication Down check that the Ethernet Cable is plugged in. See
Symptom 4: Communication Down for more details.
2. Verify if the correct voltage is read:
a. Navigate Display Screen to Manual Valve Control.
i. Select MACHINE INFO. See Figure 10.
ii. Select MANUAL VALVE CONTROL. See Figure 11.
iii. Enter passcode 2186 and select enter.
b. Verify reading on touchscreen of “24V, 5V, 3.3V” Supply is within tolerances on. See Figure 12 and Figure
13. If all voltages are within tolerance, restart the Fridge (Unplug and plug back in) and check the voltage
again. If issue persists, update the software. Refer to Appendix F: Software Update.
c. If there is a voltage reading but is on incorrect setting, remove the Rear Enclosure Cover Panel and locate
the potentiometer on the power supply. Turn the potentiometer with a Phillips Head Screwdriver to adjust
the voltage to 24V with a tolerance of +/- 0.5V. See Figure 14.
Voltage Setting
Value
Tolerance
Units
Probe Points
24V power
24
+/- 0.5
Volts
Screen Harness - Green Connector
Power Supply - Output Terminals
PCB Power Input - Green Terminal
5V power
5
+/- 0.2
Volts
Pressure Transducer - Black and Red Pins in Connector
Flowmeter Harness - Black and Gray Pins in Connector
3.3V power
3.3
+/- 0.2
Volts
N/A (Board Level)
Figure 11: Machine Info Screen with Manual
Valve Control Circled.
Figure 12: Voltage readings Circled.
Figure 10: Home Screen with Machine Info
Circled.
Figure 9: Invalid Voltage Screen.
Figure 13: Voltage values and tolerance.

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3. If the voltage does not change by use of the potentiometer on the power supply, use a DVOM to check the
voltage output at the Power Supply (-V and +V) to verify it is at 24VDC. See Figure 15. Follow the harness to the
board and verify that the PCB is also getting 24VDC. See Figure 15.
a. If the voltage output on the DVOM is approximately at 24VDC, the issue is with the PCB or the software,
update the software. Refer to Appendix E: Software Update Instructions. If a software update does not
resolve the issue, replace the PCB.
b. If the voltage output on the DVOM is not at approximately 24VDC, the Power Supply may be damaged and
needs to get replaced. Verify the input is getting approximately 120VAC with use of DVOM and follow the
High Voltage Power Harness to ensure it is not damaged if input does not have correct voltage coming in.
See Figure 15. Refer to Symptom 1: Screen Blackout Step 2 to verify the Power Supply is malfunctioning and
replace if necessary.
c. If board is verified to be getting correct voltage and is still displaying INVALID VOLTAGE error, the problem is
with the PCB; replace the PCB.
Potentiometer
Figure 14: Potentiometer Location shown.
Probe Here for
Power Supply
Output (24VDC)
Probe Here
for PCB Power
input (24VDC)
Figure 15: Probe locations shown.
Probe Here for Power
Supply input(120VAC)

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Symptom 4: Communication Down:
1. Open the door and remove the screen cover and foam to verify that the Ethernet cable, USB cable and Power
Supply cable are all plugged in. Plug in a loose connection See Figure 17.
2. Remove the Rear Enclosure Cover to verify the Ethernet Cable is plugged into the PCB. See Figure 18a and
Figure 18b.
3. Next verify that the PCB has LED Lights on, if it is not on, check the harness from the power supply to the PCB is
not broken. This can be verified by probing the Power Supply Output and the PCB Power Input Terminal. See
Figure 15.
Ethernet Cable
Figure 18a: Ethernet Cable Shown-Old
Configuration.
Figure 16: Communication Down Screen.
Figure 18b: Ethernet Cable Shown-New
Configuration.
Ethernet Cable
Ethernet
Cable
Display
Power Supply
Harness
USB Cable
Figure 17: Screen Wiring shown.