Nu-Vu SUB-123P Service Manual

NU-VU® Model:

SUB-123P

Oven / Proofer

SERVICE AND REPAIR MANUAL

Revised:

Nov 16, 2009

(SUB-123P-ServiceManual-01e)

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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

CALIBRATION INSTRUCTIONS........................................................................................... 7

HUMIDITY SPRAY TIME ADJUSTMENT ............................................................................. 8

ERROR CODES .................................................................................................................... 8

PARTS LIST........................................................................................................................... 9

ELECTRICAL SCHEMATICS ..................................................................................... 11 - 12

EXPLODED VIEWS........................................................................................................ 13-14

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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 ................................................................................................. 11 – 12

Exploded Views ...............................................................................................................13-14

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SUB–123P SERVICE AND REPAIR MANUAL TROUBLESHOOTING GUIDE

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 – Correct wiring 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 – Correct wiring problem

Drawing 1

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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TROUBLESHOOTING GUIDE SUB–123P SERVICE AND REPAIR MANUAL

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

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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SUB–123P SERVICE AND REPAIR MANUAL TROUBLESHOOTING GUIDE

Controller problems

The controller display doesn’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 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

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

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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WATER FILTER INSTALLATION SUB–123P SERVICE AND REPAIR MANUAL

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
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.

bend the tubing within two (2) inches of the

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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SUB–123P SERVICE AND REPAIR MANUAL OVEN DOOR REVERSAL

OVEN DOOR HINGE REVERSAL

Drawing 5

Important: disconnect power before beginning

Tools Required:
5/16” hex key (Allen wrench)
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 oven door hinge bolts (4) using a 5/16” hex key.

3. With the door laying face down on a flat surface, open the inner door panel. Move the hinge and
latch pins (one at a time) (note: the pins in the long slots do not need to be moved) to the holes
next to the ones that they are in. Looking at the door from the front, the pins should be in the
upper holes.

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. Do not disconnect wires from the switch.

6. Remove metal plug from the door jamb opposite the door switch. If there isn’t a hole opposite
the door switch, a ½” hole will need to de drilled. A center punch will be in the jamb to locate the
hole. If a hole must be drilled, remove all metal shavings afterwards.

7. Install the door switch in the ½” hole that you removed the metal plug from.

8. Install the metal plug that you removed in the old door switch hole.

9. Remove the bolts from the front face using a 9/16” wrench and install them in the holes that you
removed the hinge bolts from.

10. Remove the screw on the lath strike plate using a Phillips screwdriver. Be careful not to loose
the spacers or lock washers.

11. Install the latch strike plate on the opposite side of the front face. The screws should be
centered top to bottom in the slots.

12. Re-install the oven door using the hinges bolts that you removed in step 2 earlier.

13. The door should now be tested to insure that it seals properly. (Refer to Door Test Procedure)

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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HUMIDITY SPRAY TIME ADJUSTMENT SUB–123P SERVICE AND REPAIR MANUAL

PROOFER DOOR HINGE REVERSAL

Drawing 6

1. Remove doors, hinges, and strike from the proofer.

2. Install steel plugs in all existing hinge and handle holes.

3. Locate the new hinge holes on the proofer. Ø.136 holes are punched in the jamb to locate where
the holes should be drilled.

4. Drill out each hole with a #30 drill bit. Follow with a 5/32” bit. Tap 10-32.

5. Install new hinges and strike plate.

6. Hang door and make needed adjustments on strike plate.

Tools required:
Phillips screwdriver
3/8” wrench
Reversible drill (corded or cordless)
#30 drill bit (can be ordered from Nu-Vu, P/N 51-0624)
5/32” drill bit (can be ordered from Nu-Vu, P/N 51-0194)
10-32 tap (can be ordered from Nu-Vu, P/N 51-0296)

Parts required:
Hinges (2 required)
11/64” Hole plugs (8 required), Nu-Vu P/N 53-0233

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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SUB–123P SERVICE AND REPAIR MANUAL CALIBRATION INSTRUCTIONS

CALIBRATION INSTRUCTIONS

Drawing 7

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 by pressing the buttons labeled power

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) Note the maximum temperature readings of the thermocouple or thermometer and the

corresponding temperature display.

5) Subtract the maximum temperature of the display from the maximum value of the thermocouple

or thermometer. For example; the maximum temperature on the display was 356 and the
maximum temperature of the thermocouple or thermometer was 351. (351 - 356= -5) The offset
for the oven would be negative five.

6) Press and hold the enter key for approximately 15 seconds until a beep is heard.

7) The offset screen will now be displayed. The recipe buttons (labeled button 1 – button 6 in the

above drawing). Button 1 will decrease the humidity offset by one, button 4 will increase the
humidity offset by one. Button 2 will decrease the proofer temperature offset by one, button 5
will increase the proofer temperature offset by one. Button 3 will decrease the oven temperature
offset by one, button 6 will increase the oven temperature offset by one. Using the above
example; press button 3 five times.

8) After entering the desired offsets press the enter key to exit the offset screen.

9) Allow the temperature to cycle again and observe the maximum temperature as describe in step

4. If the temperatures are the same the unit is properly calibrated and ready for use. If the
temperatures are not the same, repeat the calibration process beginning with step 4.

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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HUMIDITY SPRAY TIME ADJUSTMENT SUB–123P SERVICE AND REPAIR MANUAL

HUMIDITY SPRAY TIME ADJUSTMENT

1. Enter the offset screen, refer to calibration instructions.

2. Pressing the left arrow key will reduce the spray duration, pressing the right arrow key will

increase the spray duration (bottom line label H2O).

3. The cycle time (the time between sprays) is fixed at 20 seconds and cannot be changed.

4. The default setting is 25 which equates to ½ of a second spray time.

ERROR CODES

1. TC ERR = the oven thermocouple leads are reversed or disconnected.

2. DOOR = the door switch has not been open for more than 60 seconds.

3. SENSOR = a communication error has occurred with the RH sensor in the proofer.

4. SENSOR FAULT = a communication error has occurred with the RH sensor in the proofer.

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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SUB–123 SERVICE AND REPAIR MANUAL REPLACEMENT PARTS LIST

REPLACEMENT PARTS LIST

(SUB-123P)

Reference # Description Replacement Part #

ELECTRICAL COMPONENTS - -

1 Power Terminal Block ................................................................................................................. 50-0237

2 Ground Lug ................................................................................................................................. 50-1329

3 Contactor:

120-volt coil, 40-amp (US).................................................................................................... 66-2013

4 Programm able Controller Assem bly...........................................................................................112-9153

5 Oven Temperature Sensor ......................................................................................................... 252-3001

6 Oven Heating Element:

208-volt, 2000-watt ............................................................................................................. 251-1005

240-volt, 2000-watt ............................................................................................................. 251-1002

7 Oven Motor Assembly............................................................................................................... 250-1002

8 Proofer Sensor ..............................................................................................................................66-1146

9 Proofer Heat Element:

120-volt, 255-watt (Manual Fill) ....................................................................................... 60-0002-B

120-volt 600-watt (Automist) ......................................................................................... 60-0001-1-B

10 Proofer Humidity Element Assembly:

120-volt, 650-watt (US) ...................................................................................................... 251-2001

11 Proofer Motor Assembly:

Manual Fill ........................................................................................................................... 250-2004

Automist. ............................................................................................................................. 250-2010

12 Control Transformer (24 VAC output)......................................................................................... 66-9505

15 Oven Door Micro Switch ......................................................................................................... 252-2004

16 Alarm .........................................................................................................................................252-1022

17 Thermal Overload Safety (425°F)................................................................................................ 66-1114

18 Manual Reset Fuse (20 Amp) ....................................................................................................... 66-1097

19 Cooling Fan................................................................................................................................ 250-3001

20 Light Fixture:

Socket .................................................................................................................................... 50-1020

Bulb:

120-volt, 40-watt (US) .................................................................................................... 50-0695

Light fixture kit Oven (Socket, Globe, and Gasket) ................................................................. 252-7004

Light fixture kit Proofer (Socket, Globe, and Gasket) .............................................................. 252-7006

21 Water Solenoid Valve (Automist only) .................................................................................... 50-0308-1

DOOR COMPONENTS - -

41 Oven Door (without Latch):

Hinged Left .......................................................................................................................... 112-9159

Hinged Right ....................................................................................................................... 112-9151

42 Proofer Door (without hardware)................................................................................................. 21-1950

43 Proofer Door Hinge:

Left side ............................................................................................................................... 254-3011

Right side ............................................................................................................................. 254-3012

44 Latch/Catch Assembly:

Proofer ........................................................................................................................... 254-2025

Oven................................................................................................................................254-2026

46 Gasket:

Oven Door............................................................................................................................ 254-1001

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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REPLACEMENT PARTS LIST SUB–123P SERVICE AND REPAIR MANUAL

Proofer Door ..................................................................................................................... 70-0358-A

OVEN INTERIOR COMPONENTS - -

50 Oven Wall Assembly (Right) ..................................................................................................... 112-9067

51 Oven Wall Assembly (Left)........................................................................................................ 112-9066

52 Oven Element / Fan Cover...................................................................................................... 112-0013-B

53 Wire Fan Guard............................................................................................................................112-0275

PROOFER INTERIOR COMPONENTS - -

60 Proofer Element / Fan Cover

Manual Fill ....................................................................................................................112-0031-1-A

Automist ................................................................................................................................112-9027

61 Proofer Wall Assembly (Right) ..................................................................................................112-9023

62 Proofer Wall Assembly (Left) ....................................................................................................112-9024

64 Water Pan (Manual Fill only) ...................................................................................................... 50-0074

65 Wire Shelf .............................................................................................................................. 112-0059-B

67 Quick Change Nozzle Kit........................................................................................................... 251-3005

67a Quick Change Nozzle....................................................................................................................31-0454

67b Quick Change Nozzle Base...........................................................................................................31-0453

GENERAL EXTERIOR COMPONENTS - -

71 Outside Top............................................................................................................................. 112-0075-B

75 Caster ......................................................................................................................................... 50-0058

76 Water Inlet Bulkhead (Automist only)......................................................................................... 31-0058

77 Drain Pan ...................................................................................................................................... 50-0547

78 Side Panel.............................................................................................................................112-0066-1-A

79 Water Filter Assembly (Automist only)......................................................................................112-9166

81 Drip Trough Assembly ................................................................................................................135-9950

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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SUB–123 SERVICE AND REPAIR MANUAL ELECTRICAL SCHEMATICS

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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ELECTRICAL SCHEMATICS SUB–123 SERVICE AND REPAIR MANUAL

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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SUB–123 SERVICE AND REPAIR MANUAL EXPLODED VIEWS

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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EXPLODED VIEWS SUB–123 SERVICE AND REPAIR MANUAL

NU-VU® FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035

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