i
NU-VU
®
Model:
NVT-3/9
Oven / Proofer
SERVICE AND REPAIR MANUAL
Revised:
Aug 14, 2014
(NVT-39-ServiceManual-01c)
ii
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
HUMIDITY SPRAY TIME ADJUSTMENT ........................................................................ 8
PARTS LIST .............................................................................................................. 9-10
ELECTRICAL SCHEMATICS ............................................................................... 11 - 12
EXPLODED VIEWS ................................................................................................ 13-14
iii
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 ............................... Calibration Instructions ............................................... 7
Drawing#7 ........................................ Offset Screen ........................................................ 7
Electrical Schematics .......................................................................................... 11 – 12
Exploded Views....................................................................................................... 13-14
NVT-3/9 SERVICE AND REPAIR MANUAL TROUBLESHOOTING GUIDE
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 1 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
Troubleshooting Guide
Oven Problems
The oven doesn’t heat up ...................................................................................................................................
Is there a period 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 elements
No – Go to next step (The oven motor doesn’t rotate)
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.............................................................................................................................
Does it read “Door Open” on the display?
Yes – Check oven door switch
No – Is the oven motor wired correctly?
Yes – Replace oven motor assembly
No – Correct wiring problem
Drawing 1
TROUBLESHOOTING GUIDE NVT-3/9 SERVICE AND REPAIR MANUAL
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 2 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
Proofer Problems
The proofer is not heating up
Is there a period next to the proofer temperature on the display?
Yes – Check proofer heating elements
Proofer elements OK – Replace control board
Proofer elements not OK – Replace Proofer elements
No– Is the actual proofer temperature on the display higher than the set-point?
Yes – Replace Proofer temperature 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 a period next to the proofer humidity on the display?
Yes – Remove proofer element cover
Is the nozzle spraying water? (It should spray every 45 seconds)
No – Remove nozzle; does water spray?
Yes – Clean nozzle
No – Replace solenoid
No - Is the actual humidity on the display higher than the set-point?
Yes – Replace Humidity Sensor
No – Turn on water supply to the unit
No – Connect a water line to the unit and turn the water supply on
Drawing 2
NVT-3/9 SERVICE AND REPAIR MANUAL TROUBLESHOOTING GUIDE
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 3 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
Controller problems
The controller display doesn’t power up ..............................................................................................................
Does the indicator light on the on/off switch illuminate?
Yes – Are the cooling fans on?
Yes – Open oven door and depress door switch ten times.
Do interior lights come on?
Yes- Replace display
No – Contact Nu-Vu Service for further assistance.
No – Check output from 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
No – Check resettable breaker on rear of equipment and breakers in your electrical box
How do I adjust the volume on the buzzer? ........................................................................................................
Turn the volume baffle on the buzzer until the desired volume is achieved
Open = Louder
Close = Quieter
Drawing 3
WATER FILTER INSTALLATION NVT-3/9 SERVICE AND REPAIR MANUAL
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 4 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
Water Filter Installation
Drawing 4
1. Attach water filter bracket to the rear of the unit using the 10-32 screws 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. Push the end of the tubing all the way into the intake Water Fitting (approximately 3/8”).
NVT-3/9 SERVICE AND REPAIR MANUAL OVEN DOOR REVERSAL
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 5 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
OVEN DOOR HINGE REVERSAL
Drawing 5
Important: disconnect power before beginning
Tools Required:
7/16” socket and ratchet
9/16” wrench or adjustable wrench
Slotted screwdriver
Phillips screwdriver
1. Remove both side panels and access covers (on sides, level with the door switch) using a
slotted screwdriver.
2. Remove the top oven door hinge pin bolts (2) using a 7/16” socket and ratchet.
3. Remove top oven door hinge pin and lift door off of bottom oven door hinge pin.
4. Remove the screws holding the latch onto the door, flip the latch over so that the handle points
to the bottom of the door and re-install the screws.
5. Remove the door switch using a 9/16” wrench. Disconnect wires from the grey connectors
using the orange levers to be able move wires to the opposite side.
6. Remove metal plug from the front face opposite the door switch
7. Install the door switch in the ½” hole that you removed the metal plug from and reconnect the
wires.
8. Install the metal plug that you removed in the old door switch hole.
9. Remove the hinges using a Phillips screwdriver; be sure not to lose the thrust bearing from the
bottom hinge pin.
10. Remove the screws from the front face using a slotted screwdriver and install them in the holes
that you removed the hinge screws from.
11. Remove the screw on the latch strike plate using a Phillips screwdriver. Be careful not to lose
the spacers or lock washers.
12. Install the latch strike plate on the opposite side of the front face. The screws should be
centered top to bottom in the slots.
13. Re-install the hinges on the opposite side of the face. The bottom hinge will now be the top
hinge and the top hinge will now be the bottom hinge.
14. Install the bottom hinge pin, be sure to install thrust bearing on bottom hinge pin and remove
the top hinge pin.
15. Re-install door by placing the door on the bottom hinge pin and installing the top hinge pin.
16. The door should now be tested to insure that it seals properly. (Refer to Door Test Procedure)
HUMIDITY SPRAY TIME ADJUSTMENT NVT-3/9 SERVICE AND REPAIR MANUAL
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 6 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
PROOFER DOOR HINGE REVERSAL
1. The proofer door is reversed using the same procedure as the oven door with the exception of the
steps referring to the door switch as there is no proofer door switch. The proofer handle points up
instead of down as it is on the oven door.
NVT-3/9 SERVICE AND REPAIR MANUAL CALIBRATION INSTRUCTIONS
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 7 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
CALIBRATION INSTRUCTIONS
Drawing 6
1) Place a thermocouple or a reliable thermometer on a pan in the center of each cavity.
2) Turn on the oven and proofer cavities of the unit and select the bread recipe.
3) Allow the temperature in the oven and proofer to stabilize.
Important Note: Allow the oven to cycle at least twice before attempting to
calibrate the unit.
4) Press the program key (PROG) to bring up the numerical keypad, key in 6888 followed by the
enter key (the check mark key).
5) Compare the temperature value on your thermometer and the display.
6) If the values match, your unit is calibrated properly. If the values do not match, press the “+” or
“-“ keys to change the display value to match your thermometer.
7) To exit the calibration screen, press the enter key.
Drawing 7
REPLACEMENT PARTS LIST NVT-3/9 SERVICE AND REPAIR MANUAL
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 8 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
HUMIDITY SPRAY TIME ADJUSTMENT
1. Enter the offset screen (Drawing 7), refer to calibration instructions.
2. Pressing the “+” key next to “On Time” will reduce the spray duration, pressing the “-“
key next to “On Time” will increase the spray duration.
3. The cycle time (the time between sprays) is fixed at 45 seconds and cannot be
changed.
4. The default setting is 500ms which equates to ½ of a second spray time.
NVT-3/9 SERVICE AND REPAIR MANUAL REPLACEMENT PARTS LIST
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 9 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
REPLACEMENT PARTS LIST
(NVT-3/9)
Reference # Description Replacement Part #
ELECTRICAL COMPONENTS - -
1 Power Terminal Block ....................................................................................................... 50-1539
2 Ground Lug ....................................................................................................................... 50-1329
3 Contactor: .......................................................................................................................... 66-2017
4 Touch Screen Panel Assembly .......................................................................................... 112-9187
Touch Screen Only .....................................................................................................66-1189-1
5 Main Control Board ............................................................................................................. 66-1188
6 Oven Temperature Sensor .............................................................................................. 252-3001
7 Oven Heating Element Assembly:
208-volt, 5000-watt total .......................................................................................... 60-0210-A
240-volt, 5000-watt total ........................................................................................... 60-0211-A
380-volt, 5000-watt total ........................................................................................... 60-0213-A
8 Oven Motor and Fan Assembly ....................................................................................... 250-1004
9 Proofer Humidity Sensor .................................................................................................... 66-1146
10 Proofer Temperature Sensor ........................................................................................... 252-3001
11 Proofer Heat Element:
120-volt 600-watt (Automist) (240V, 380V, 415V) .................................................. 60-0001-1-B
104-volt 600-watt (Automist) (208V) ......................................................................... 60-0212-A
12 Proofer Motor and Fan Assembly: ................................................................................... 250-2015
13 Control Transformer ............................................................................................................ 66-9505
14 Oven Door Micro Switch ................................................................................................ 252-2004
15 Alarm ............................................................................................................................. 252-1022
16 High Limit Switch ............................................................................................................... 66-1114
17 Manual Reset Breaker (20 Amp) ......................................................................................... ELB097
18 Cooling Fan .......................................................................................................................... 97525
19 Light Fixture:
Primary Gasket .................................................................................................... 112-0318-A
Bulb:
12-volt, 20-watt ...................................................................................................... 50-1568
Light fixture kit (Socket, Bulb, Globe, and Gasket) .......................................................... 112-9175
20 Water Solenoid Valve ........................................................................................................ 50-1415
21 Oven Lights Transformer Assembly .................................................................................. 112-9208
22 Proofer Lights Transformer Assembly ............................................................................... 112-9209
23 Rocker Switch ..................................................................................................................... 66-3008
DOOR COMPONENTS - -
41 Oven Door (without Hardware): ......................................................................................... 112-9188
42 Proofer Door (without hardware): ....................................................................................... 112-9189
43 Door Hinge set: ................................................................................................................. 254-3041
44 Latch/Catch Assembly:
Proofer ................................................................................................................. 254-2026
Oven ..................................................................................................................... 254-2026
46 Gasket:
Oven ....................................................................................................................... 112-0344-A
Proofer ................................................................................................................... 112-0343-A
REPLACEMENT PARTS LIST NVT-3/9 SERVICE AND REPAIR MANUAL
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 10 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
OVEN INTERIOR COMPONENTS - -
50 Oven Wall Assembly (Right) ............................................................................................ 112-9190
51 Oven Wall Assembly (Left) .............................................................................................. 112-9191
52 Oven Element / Fan Cover Assembly .............................................................................. 112-9192
53 Wire Fan Guard ................................................................................................................ 112-0275
PROOFER INTERIOR COMPONENTS - -
60 Proofer Fan Cover Assembly ........................................................................................... 112-9193
61 Proofer Wall (Right) ......................................................................................................... 112-0335
62 Proofer Wall (Left) ........................................................................................................... 112-0336
65 Wire Shelf ...................................................................................................................... GR17T26
67 Water Nozzle Assembly .................................................................................................... 251-3005
67a Quick-change Humidity Injection Nozzle ........................................................................... 31-0454
67b Quick-change Humidity Injection Nozzle Base ................................................................... 31-0453
GENERAL EXTERIOR COMPONENTS - -
71 Outside Top ............................................................................................................... 112-0338-1-A
72 Drip Trough ...................................................................................................................... 112-9194
75 Caster ............................................................................................................................. 50-0058
76 Water Inlet Adapter ........................................................................................................... 31-0460
77 Drain Pan ......................................................................................................................... 50-0072
78 Side Panel .................................................................................................................. 112-0337-1-A
79 Water Filter Assembly (Automist only) .............................................................................. 112-9166
81 3M Cuno Water filter Cartridge (Automist only) ................................................................... 50-1413
NVT-3/9 SERVICE AND REPAIR MANUAL ELECTRICAL SCHEMATICS
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 11 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
ELECTRICAL SCHEMATICS NVT-3/9 SERVICE AND REPAIR MANUAL
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 12 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
NVT-3/9 SERVICE AND REPAIR MANUAL EXPLODED VIEWS
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 13 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
EXPLODED VIEWS NVT-3/9 SERVICE AND REPAIR MANUAL
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page 14 Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
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