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.

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4. Verify the Ethernet cable is not damaged. Bypassing the installed ethernet cable with a known/functioning
ethernet cable would be easiest way to check. Replace the Ethernet Cable if this resolves the problem.
5. If Ethernet Cable is undamaged and issue persists, update the software. Refer to Appendix E: Software Update
Instructions.
6. Replace PCB if communication is still down after a software update.
7. Replace Screen if PCB replacement does not resolve the issue.
Symptom 5: No Product Flow
1. If lockout screen is seen, run cleaning cycle. See Symptom 7: Lockout if issue persists.
2. Verify the keg is connected and the pressure relieve valve on the keg is closed allowing keg to build pressure.
3. Verify the keg has product in it.
4. Verify the filter is cleaned.
5. Check product line for any blockage.
6. Depressurize the unit and Remove faucet nozzle and check restrictor plate for blockage. See Figure 19.
7. Remove the Rear Enclosure Cover and verify that the solenoid is not stuck close. If the solenoid is stuck close
there will be no product past the Solenoid. Visually inspect the tube immediately after the solenoid for presence
of product (black coffee). See Figure 20.If no coffee is present the tube will appear clear (blue or white
depending on which tube was used). If there is a solenoid failure, verify if it is mechanical (more likely) or
electrical:
Flow
Corrector
Restrictor
Plate
Nozzle
O-Ring
Nozzle
Faucet O-Ring
Faucet Body
Check for
presence of
product here
Figure 19: Faucet anatomy.
Figure 20: Flowmeter Solenoid Assembly.

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a. If the solenoid is stuck close due to mechanical failure, the solenoid will be cold. Replace the
Flowmeter/Solenoid Module. Refer to Appendix G: Flowmeter Solenoid Module Replacement for
procedure.
b. If the solenoid is stuck close due to electrical failure the solenoid will be hot. You can verify this further by
probing the solenoid quick connects with a DVOM to see if it is getting power:
i. Verify if the cleaning cycle has been run (you will see LOCKOUT error if cleaning cycle is due) then
replace the Solenoid Harness. See Symptom 7: Lockout.
ii. See If issue persists, update the software. Refer to Appendix F: Software Update.
iii. If software update does not solve the issue, replace the PCB.
Symptom 6: Low Pressure Warning:
1. Verify the keg is connected and the pressure relieve valve on the keg is closed.
2. Verify the filter is cleaned.
3. Check if the pressure readings are updating on the Touch Screen:
a. Select Machine Info from the Home Page to see the pressure readings from the Pressure Transducers. See
Figure 21a and Figure 21b.
b. Turn the Regulator Knobs on top of the Rear Enclosure while monitoring the touch screen. See Figure 21c.
c. If pressure is not changing on the screen when adjusting, refer to Appendix I: Verify Pressure Transducer
Functionality to check if the Pressure Transducers are malfunctioning.
4. Check product line for any blockage:
a. If coffee ground is found inside the lines, all lines will have to be cleaned:
i. Clean Filter inside the Refrigerated space. Remove the Filter Cap and Filter Screen and clean thoroughly.
Figure 21b: Pressure Readings on INFO
Screen shown.
Figure 21a: Home Screen with Machine
Info Circled.
Figure 21c: Pressure Regulator Knobs on the
Rear Enclosure.
Regulator
Knobs
Figure 22a: Filter Cap Removed.
Figure 22b: Filter Screen Removed.

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ii. Connect a keg with water to the system and run water through the lines by opening both faucets and
letting the water run.
iii. Remove the faucet nozzle and clean the restrictor plate. See figure 23. Remove the O-Ring with an O-
Ring Pick, Clean the restrictor Plate and reassemble. Be careful not to lose any components. See Figure
19 for Nozzle Components.
iv. Connect a keg with product and verify proper foam levels to ensure system does not still have clogs. See
Symptom 8: Incorrect Foam Level.
b. If blockage is found if the form of frozen coffee build-up within the beverage lines, fill a spare coffee keg
with warm water and connect it to the system. Flush warm water through system until warning goes away.
c. If warning continues after extensive warm water pour, follow step below to adjust the pressure delta:
i. Press ‘SETTINGS’ on the main menu screen.See Figure 24a.
ii. Enter code 2186 and press the green ‘ENTER’ icon.See Figure 24b.
iii. Press ‘PRODUCTION TOOLS’.See Figure 24c.
iv. Enter same code 2186 and press the green ‘ENTER’ icon.See Figure 24b.
v. The ‘DELTA FILTER PRESSURE FAULT’ will be factory set at 15psi. Press the ‘UP’ arrow on the right side of
the setting 2x to raise the delta to 25 psi. See Figure 24a.
vi. ONCE ADJUSTED, PRESS THE ‘BACK’ BUTTON ON FOLLOWING SCREENS UNTIL THE ‘MAIN MENU’ IS
REACHED. Adjustment complete. See Figure 24a.
Figure 24a: Settings tab shown.
Figure 24b: PIN Required Screen Shown.
Figure 24c: Production Tools Tab shown.
Figure 24d: Delta Filter Pressure Fault Adjustment shown.
Figure 23: Restrictor Plate Clog.

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Symptom 7: Lockout:
1. Run weekly cleaning cycle. If cleaning cycle fails to complete go to Symptom 2: Unit Stuck in Cleaning Cycle.
2. If issue persists, update the software and run another weekly cycle. Refer to Appendix E: Software Update
Instructions.
3. If updating the software does not resolve the issue, replace the Touch Screen.
4. If replacing the Touch Screen does not resolve the issue, replace the PCB.
5. If previous steps do not resolve the issue, manually reset data through settings. This will get the unit up and
running until root problem is found out or replacement unit is sent:
a. From Home Screen select Settings. See Figure 25a.
b. Enter passcode 2186.
c. Select PRODUCTION TOOLS. See Figure 25b.
d. Enter passcode 2186.
e. Select LOAD DEFAULTS. See Figure 25c.
f. Select RESET STATS. See Figure 25c.
g. Select BACK. See Figure 25c.
h. Select BACK. See Figure 25b.
i. Wait until READY indicator appears at top of screen. See Figure 25a.
Symptom 8: Incorrect Foam Level
1. If foam level is too high/low, check the pressure setting and set it to the settings as shown in table 1. If the foam
height is between ¼”- ½” then the system is functioning properly. If customer requests more foam still, adjust
the nitrogen pressure up. If the customer requests less foam still, adjust the nitrogen pressure down. See Figure
26:
Pressure Setting
Nominal Range(psi)
Pre-Filter
38-42
Post Filter
36-42
Nitrogen
7-10
a. Select Machine Info from the Home Page to see the pressure readings from the Pressure Transducers. See
Figure 26a and Figure 26b.
b. Turn the Regulator Knobs on top of the Rear Enclosure while monitoring the touch screen until proper
pressures are seen. See Figure 26c.
c. If pressure is not changing on the screen when adjusting, refer to Appendix I: Verify Pressure Transducer
Functionality to check if the Pressure Transducers are malfunctioning.
Figure 25b: Settings Screen with Production
Tools Circled.
Figure 25c: Production Tools Screen with
Load Defaults and Reset Stats Circled.
Figure 25a: Home Screen with Settings Circled.
Figure 26: Nitrogen Range.

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2. If the Post Filter range is inside the nominal range, and Foam level is too HIGH then clean the filter screen and
run cleaning cycle to clean possible blockages slowing down the flow rate. See Symptom 6: Low Pressure
Warning if the flow rate is slow with too much foam and low-pressure warnings are seen.
3. If the settings are within nominal settings and the drink Foam Level is too LOW and rapidly disappearing, remove
the faucet nozzle and clean the restrictor plate. See figure 27. Remove the O-Ring with an O-Ring Pick, Clean the
restrictor Plate and reassemble. Be careful not to lose any components. See Figure 19 for Nozzle Components.
4. If foam level is too LOW, pressure settings are nominal, and restrictor plate is clean; then check the Check Valve
at the tower. See Figure 28a.If the Check Valve is accessible without removing the tower do so, if the tower has
to be removed, refer to Appendix I: Disassembling The Tower. Verify that the Arrow on the Check Valve is
facing the up towards the Venturi. If the Arrow was facing the wrong way, correct the orientation and check if
foam level is corrected. See Figure 28b. If the Arrow is facing the correct way to begin with, replace the Check
Valve.
Figure 27: Restrictor Plate Clog.
Figure 28a: Check Valve Shown.
Check Valve
Arrow
Pointing
Upwards
Figure 28b: Check Valve direction shown.
Figure 26b: Pressure Readings on INFO
Screen shown.
Figure 26a: Home Screen with Machine
Info Circled.
Figure 26c: Pressure Regulator Knobs on the
Rear Enclosure.
Regulator
Knobs

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5. If foam level is too LOW, verify that the nitrogen line solenoid is not stuck shut by removing the rear enclosure
cover:
a. Verify that the Nitrogen supply line is active.
b. Disconnect the keg.
c. Select MACHINE INFO. See Figure 29a.
d. Select MANUAL VALVE CONTROL See Figure 29b.
e. Enter passcode 2186. This will close the solenoid.
f. Open both faucets and verify there is no flow from the faucets. See Figure 30.
g. Select GAS VALVE CLOSED on touchscreen. This will change the selection to GAS VALVE OPEN which indicates
that the valve is now open. Verify that there is Nitrogen flowing through the Faucet. See Figure 31.
h. If Nitrogen is flowing through the faucet then the Solenoid is fully functional. If there is no Nitrogen Flowing,
replace the Nitrogen Line Solenoid. Refer to Appendix H: Nitrogen Line Solenoid Replacement for procedure.
6. If there is no clog found(coffee grounds or ice formation), Nitrogen Pressure can be adjusted(the readings on the
Touch Screen respond to adjustments), Nitrogen Solenoid is functional, Check Valve is functional, Faucet
Restrictor Disk is clean, and all pressure readings are at or near nominal values, there may be a clog inside the
Figure 29b: Machine Info Screen with Manual
Valve Control Circled.
Figure 29a: Home Screen with Machine Info
Circled.
Figure 30: Tower Faucets in OPEN Position.
Tower Faucets
in OPEN
Position
Figure 31: Manual Control Screen with Gas Valve Closed
circled.

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Tower Tubing Assembly. Change out the Tower Tubing Assembly. See Appendix H: Disassembling the Tower for
instructions on how to replace the Tower Tubing Assembly.
Symptom 9: Liquid Leaks Inside Refrigerated Space/Rear Enclosure
1. If leak is from a barbed joint:
a. Verify that the Oetiker clamp is completely closed by viewing the gap size at the clamp actuator. If a gap
exists, use Oetiker pliers to tighten clamp. See Appendix A: Oetiker Clamp Application for reference.
b. If Oetiker Clamp is incorrectly installed or incorrect Oetiker Clamp is installed, cut off the barbed fitting and
replace it with a new barbed fitting with the appropriate Oetiker Clamp. If the length of the tube is too
short, then replace the entire length of the tubing cut to match the original tubing length. See Appendix A:
Oetiker Clamp Application for reference.
c. Connect a keg filled with water and pressurize system to verify the leak has stopped.
2. If leak is from a push to connect fitting:
a. Push the tube/stem further into the push to fit fitting.
b. If the tubing/stem pushes in further, then connect a keg filled with water and pressurize system to verify
the leak has stopped.
c. If fitting is leaking still, replace the fitting. See Appendix D: John Guest Speed Fit Guide for reference.
3. If leak is from filter, open the filter cap and verify all sealing O-Rings are installed. There should be one O-Ring on
the filter cap and one O-Ring on the filter screen. If either O-Ring is missing, replace it before reinstalling the
Filter Screen back into the unit. See Figure 32.
4. If leak is coming from Flowmeter-Solenoid Module (product line), replace the entire module Refer to Appendix
G: Flowmeter Solenoid Module Replacement for procedure.
Symptom 10: Tower Leaks
1. If leak is from locknut on the faucet (See Figure 33), tighten the locknut and verify the leak has stopped. If leak
does not stop then check for O-Ring:
Filter Screen
O-Ring
Filter Cap
O-Ring
Figure 32: Filter O-Rings.

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a. Remove the Faucet to verify that the Faucet has a O-Ring in it. If no O-Ring is present, then install a new O-
Ring or a new Faucet depending on availability. See Figure 34.
b. Use the Faucet Wrench to tighten the Faucet securely in place. Ensure that the nozzle opening is facing
downwards. Insert the pin on the Faucet Wrench in the opening on the Shank Nut and apply leverage to
tighten the Shank Nut. See Figure 35.
Figure 35:Install Faucet with Nozzle facing downwards.
Tighten the Shank Nut with Shank Wrench
Nozzle
Opening
pointing
Downwards
Faucet
Wrench
Ensure O-
Ring is
Present
Figure 34: Faucet O-Ring.
Leak from
this
Connection
Figure 33: Locknut on Faucet shown.

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2. Replacing the Faucet Diaphragm:
a. If the faucet is leaking right below the Faucet Handle near the Black Spacer, there is a torn diaphragm inside
the Faucet.
b. Identify that the leak is coming from the Black Spacer. See Figure 36.
c. Remove the Faucet from the tower.
d. Rotate the Silver Threaded Collar directly beneath the Black Spacer to disassemble the Faucet. See Figure 37.
e. Pull the Faucet apart. See Figure 38.
Replace faucet
diaphragm if leak
is coming from
this location
Figure 36: Black Spacer Shown.
Rotate Silver
Threaded Collar
Figure 37: Silver Threaded Collar Shown.
Figure 38: Faucet pulled apart and Diaphragm shown.
Faucet
Diaphragm

Page | 20
f. Identify and remove the Diaphragm using a flat head screwdriver or a pick. See Figure 39.
g. Replace the Diaphragm with a new diaphragm. Ensure that the Black Plastic Collar inside the Faucet does not
get lost. See Figure 39.
h. Screw the Faucet back together and install it back onto the tower by rotating the Silver Threaded Collar. See
Figure 39. Use the Faucet Wrench to tighten the Faucet securely in place. Ensure that the nozzle opening is
facing downwards. Insert the pin on the Faucet Wrench in the opening on the Shank Nut and apply leverage
to tighten the Shank Nut. See Figure 40.
3. Leak Inside Tower: Refer to Appendix I: Disassembling The Tower to see how to disassemble and reassemble the
Tower if necessary. Refer to Figure 41 to help identify fittings. After a fix, before reassembling the Tower, it is
recommended that you test the tower assembly outside the tower. Hook up a keg filled with water and
pressurize system to verify the leak has stopped. The fittings inside the Tower besides the Check Valve) are not
replaceable parts. If leaks inside the Tower cannot be fixed with existing fittings, replace the entire Tower Tubing
Assembly.
Faucet Diaphragm
removed
Figure 39: Faucet Diaphragm shown.
Black Plastic Collar
Figure 40:Install Faucet with Nozzle facing downwards.
Tighten the Shank Nut with Shank Wrench
Nozzle
Opening
pointing
Downwards
Faucet
Wrench