NUVU SUB-123P Installation and operating manual

NU-VU®Model:
SUB-123P
Oven / Proofer
SERVICE AND REPAIR MANUAL
Revised:
Sept 25, 2009
(SUB-123P-ServiceManual-01d)

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TABLE OF CONTENTS
TROBLESHOOTING............................................................................................................1
Oven problems..............................................................................................................1
Proofer problems...........................................................................................................2
Controller problems.......................................................................................................3
WATER FILTER INSTALLATION........................................................................................4
HINGE REVERSAL..............................................................................................................5
Oven Door Hinge Reversal...........................................................................................5
Proofer Door Hinge Reversal........................................................................................6
CALIBRATION INSTRUCTIONS.........................................................................................7
PARTS LIST.........................................................................................................................8
ELECTRICAL SCHEMATICS ................................................................................... 10 - 11

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LIST OF
ILLUSTRATIONS AND SCHEMATICS
Drawing #1 ....................................... Control Header ....................................................... 1
Drawing #2 .........................................Proofer Parts.......................................................... 2
Drawing #3 ................................... Control Adjustments.................................................... 3
Drawing #4 ..................................Water Filter Installation...................................................4
Drawing #5 .............................. Oven Door Hinge Reversal .............................................. 5
Drawing #6 ............................ Proofer Door Hinge Reversal ............................................ 6
Drawing #7 ................................. Calibration Instructions.................................................. 7
Electrical Schematics ............................................................................................... 10 – 11
Exploded Views............................................................................................................ 12-13

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SUB–123P SERVICE AND REPAIR MANUAL TROUBLESHOOTING GUIDE
NU-VU®FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 1 Sales Fax [phone] ♦ Service Fax [phone] [phone]
Troubleshooting Guide
Oven Problems
The oven doesn’t heat up..........................................................................................................................................
Is there an asterisk next to the oven temperature on the display?
Yes – Is the contactor engaged?
Yes – Is the oven fan rotating?
Yes – Check oven elements.
Oven elements OK – Replace contactor
Oven elements not OK – Replace oven element(s)
No – Is the motor wired correctly?
Yes – Replace oven motor assembly
No – Correctwiring problem
No – Check Hi-Limit switch.
Hi-Limit switch OK – Replace contactor
Hi-Limit switch not OK – Replace Hi-Limit switch
No – Is the actual oven temperature on the display higher than the set-point?
Yes – Replace oven temperature sensor
No – Is there a plus sign next to the oven temperature on the display?
Yes – Check oven door switch
The oven motor doesn’t rotate....................................................................................................................................
Is there a plus sign next to the oven temperature on the display?
Yes – Check oven door switch
No – Is the oven motor wired correctly?
Yes – Replace oven motor assembly
No – Correctwiring problem
Drawing 1

TROUBLESHOOTING GUIDE SUB–123P SERVICE AND REPAIR MANUAL
NU-VU®FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 2 Sales Fax [phone] ♦ Service Fax [phone] [phone]
Proofer Problems
The proofer is not heating up
Does the proofer display read “SENSOR” or “SENSOR FAULT”?
Yes – Cycle power to entire unit off then back on
Does the proofer display still read “SENSOR”?
Yes – Replace proofer sensor
No- Is there an asterisk next to the proofer temperature on the display?
Yes – Check proofer heating elements
No – Is the actual proofer temperature on the display higher than the set-point?
Yes – Replace proofer sensor
There is no moisture in the proofer
Is there a water line connected to the unit?
Yes – Is the water line to the unit turned on?
Yes – Is there an asterisk next to the proofer humidity on the display?
Yes – Remove proofer element cover
Is the nozzle spraying water? (It should spray every 20 seconds)
No – Can you hear the solenoid click?
Yes – Clean nozzle
No – Replace solenoid
No - Is the actual humidity on the display higher than the set-point?
Yes – Replace proofer sensor
No – Turn on water supply to the unit
No – Connect a water line to the unit and turn the water supply on
The display reads “CHECK WATER SUPPLY”
To clear the message, press the enter button. After clearing the message, check that the water
supply is connected and is turned on. Also verify that the nozzle is spraying water.
Drawing 2

SUB–123P SERVICE AND REPAIR MANUAL TROUBLESHOOTING GUIDE
NU-VU®FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 3 Sales Fax [phone] ♦ Service Fax [phone] [phone]
Controller problems
The controller displaydoesn’t power up......................................................................................................................
Do the interior lights come on when the power buttons are pressed?
Yes – Adjust the LCD contrast, did this correct the problem?
No – Replace controller
No – Check outputfrom transformer (output voltage should be 20 – 30 VAC)
Output voltage is OK– is there voltage at the power connections on the controller
Yes – Replace controller
No – Check the 15 pin connector for the controller
I don’t want my employees to be able to change the recipe settings........................................................................
Set DIP switch #2 to the off position (to the left)
I want the temperature to be displayed in Celsius......................................................................................................
Set DIP switch # 3 to the on position (to the right)
How do I adjust the volume on the buzzer?................................................................................................................
Turn the volume baffle on the buzzer until the desired volume is achieved
Drawing 3

WATER FILTER INSTALLATION SUB–123P SERVICE AND REPAIR MANUAL
NU-VU®FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 4 Sales Fax [phone] ♦ Service Fax [phone] [phone]
Water Filter Installation
Drawing 4
1. Attach water filter bracket to the rear of the unit using the 10-32 screws the included with the
filter assembly.
2. Run 1/4” OD tubing from the water supply line to the unit location. Allow some slack in the tubing
for final unit positioning and any future service requirements. Avoid any kinks or strains on the
tubing, and position the tubing where it will not be damaged in any way.
3. The tubing end that attaches to the back of the unit and filter must not be damaged or deformed in
any way. The cut end should be cut straight and clean with no deforming of the tubing. All burrs
and sharp or rough edges should be removed to ensure a proper and leak-free connection.
4. Position the tubing so that it runs straight into the intake Water Fitting on the rear of the unit. Be
careful not to kink the tubing if you bend it, and do not bend the tubing within two (2) inches of the
cut end.
5. The two-part compression fitting (tapered collar and nut) is placed approximately 1” onto the end
of the tubing so that the collar is inside of the nut and the threaded opening of the nut is toward
the intake Water Fitting.
6. Push the end of the tubing all the way into the intake Water Fitting (approximately 1/4”) and hold it
there while you thread the compression nut onto the intake Fitting. Tighten the compression nut
with an open-end wrench, but do not over-tighten the fitting! If the joint leaks when tested, and
further gently tightening does not stop the leakage, the compression fitting must be replaced.