Norcold N61X, N62X, N64X, N64X.3, N81X User Manual

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Service Manual

Gas/Electric Refrigerators

MODELS

N61X/N81X

N62X/N82X

N64X/N84X

N64XIM/N84XIM

N64X.3/N84X.3

WARNING

DO NOT install this refrigerator in below deck marine applications. Do not install this refrigerator in fixed indoor cabin or other dwelling applications. This refrigerator must use only NORCOLD designed and approved outside air intake and exhaust ventilation for correct and safe operation. Any other ventilation could cause lethal combustion exhaust fumes and or/explosive propane gas fumes to be in the living area and/or below deck.

Publication No. 619394E (01-28-04)

Introduction------------------------------------------------------ 1

About this Manual ................................................................. 1

Model Identification............................................................... 1

Information Label .................................................................. 1

Cooling Unit Serial Number .................................................. 1

Certification and Code Requirements ..................................1

About Installation .................................................................. 1

Replacement Parts ............................................................... 1

Technical Assistance.............................................................1

Safety Awareness --------------------------------------------- 3

Safety Notice......................................................................... 3

Attention Statements............................................................. 3

Safety Statements................................................................. 3

Specifications--------------------------------------------------- 4

N61X/N81X Models .............................................................. 4

N62X/N82X Models .............................................................. 5

N64X/N64X.3/N84X/N84X.3 Models .................................... 6

Troubleshooting – Quick Reference Guide ----------- 7 N61X/N81X Displayed Fault Codes ---------------------- 8 N62X/N82X Displayed Fault Codes ---------------------- 9 N64X/N84X Displayed Fault Codes --------------------- 10 Troubleshooting Flowcharts ------------------------------11

Blank Display – Refrigerator does not turn on ................... 11

F/no FL Fault Code – Burner failed to ignite or reignite..... 12

S/Sr Fault Code – Flame sense circuit failure.................... 13

dc LO Fault Code – Low DC voltage .................................. 13

dc HI Fault Code – DC voltage high................................... 14

dc rE Fault Code – DC relay stuck closed .........................14

dc HE Fault Code – DC heater failed open........................ 15

A/no AC Fault Code – No AC power available ................... 16

r/AC rE Fault Code – AC relay stuck closed ...................... 16

AC HI Fault Code – AC voltage high.................................. 17

AC LO Fault Code – AC voltage low .................................. 17

H/AC HE Fault Code – AC heater failed open ................... 18

Food Compartment Lamp Switch ....................................... 19

Lamp Switch Operation.....................................................19

d/dr Fault Code – Door open for more than 2 minutes ...... 19

Lamp Switch Testing Procedure ....................................... 19

Thermistor Failure Fault – Controls in backup operating

system mode....................................................................... 20

Backup Operating System (BOS)....................................... 20

N61X/N81X Backup Operation. ........................................ 20

N62X/N82XN64X/N84X Backup Operation...................... 20

Power Board Resetting Procedure ..................................... 21

n/no co Fault Code – No cooling detected by the controls 21

Ventilation -------------------------------------------------------22

Roof Exhaust Venting ......................................................... 22

Air Intake Vent..................................................................... 22

Roof Exhaust Vent .............................................................. 22

Baffles ................................................................................. 23

Vertical Angled Baffles ...................................................... 23

Double Sidewall Venting..................................................... 24

Air Intake Vent................................................................... 24

Sidewall Exhaust Vent ...................................................... 24

LP Gas System ------------------------------------------------27

Pressure Requirements ...................................................... 27

Testing for LP Gas Leaks ...................................................27

Components........................................................................ 28

Solenoid Gas Valves ......................................................... 28

New Style Solenoid Gas Valve .........................................28

Old Style Solenoid Gas Valve ........................................... 28

Solenoid Gas Valve Connections .....................................28

Orifice ................................................................................29

Burner................................................................................29

Burner Tube ...................................................................... 29

Flue ................................................................................... 30

Heat Deflector ................................................................... 30

Flue Baffle ......................................................................... 30

Flame Appearance..............................................................30

Burner Cleaning Procedure ................................................ 31

Electrical Requirements and Components-----------33

DC Voltage Requirements and Polarity..............................33

Power Board DC Fuse ...................................................... 33

DC Power Wiring Requirements......................................... 33

2-Way Models ................................................................... 33

3-Way Models ................................................................... 33

AC/DC Converter as Power Source ................................... 33

DC Heater–3-Way Refrigerators Only .............................. 33

DC Heater Circuit Fuse..................................................... 33

Lamp Assembly................................................................. 34

Divider Heater ................................................................... 34

AC Heater .........................................................................34

AC Power Requirements .................................................... 34

AC Heater Fuse ................................................................34

AC Power Cord ................................................................. 35

Power Cord for Ice Maker Units........................................35

12 Vdc Ventilation Fan........................................................35

Cooling Unit ----------------------------------------------------37

Description .......................................................................... 37

Heat Absorption ................................................................ 37

Leveled Operation............................................................. 37

Gradual Decrease in Cooling Efficiency............................. 37

Cooling System Monitoring.................................................37

First "No Cooling" Fault Occurrence.................................37

Two Recorded "No Cooling" Fault Occurrences .............. 37

Troubleshooting Cooling Faults..........................................38

Poor or No Cooling on AC Mode ...................................... 38

Poor or No Cooling on LP Gas Mode ............................... 38

Poor or No Cooling on DC Mode – 3-Way Models........... 38

Refrigerant Leakage ........................................................... 38

Disposal of Cooling Unit ..................................................... 38

Cooling System Diagnostic Flowchart................................ 39

Replacing the Cooling Unit ................................................. 41

Removing the Refrigerator from the Enclosure................ 41

Removal of Cooling Unit ................................................... 42

Installation of Replacement Cooling Unit ........................42

Reinstallation of Refrigerator into Enclosure .................... 44

Electronic Components ------------------------------------45

Power Board ....................................................................... 45

Removal–Power Board ..................................................... 45

Installation–Power Board ..................................................46

Optical Control Assembly ................................................... 46

N61X/N81X Wiring Schematic............................................47

N61X/N81X Wiring Pictorial................................................47

N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Pictorial –

Units with serial number 851759 and higher..................... 48

N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Schematic –

Units with serial number 851759 and higher..................... 48

N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Pictorial –

Units with serial number lower than 851759 ...................... 49

N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Schematic –

Units with serial number lower than 851759 ...................... 50

Controls----------------------------------------------------------51

N61X/N81X Optical Control Assembly ............................... 51

Front Box........................................................................... 51

Removal and Installation of Optical Control Assembly..... 51

Modes of Operation ............................................................ 52

Refrigerator Service Manual

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N6XX/N8XX Models

AUTO Mode ...................................................................... 52

No AC Power ..................................................................... 52

AC Power Restored ..........................................................52

No AC and No Flame........................................................ 52

GAS Mode......................................................................... 52

No Flame........................................................................... 52

Backup Operating System .................................................. 52

“Gas Lock-Out” ................................................................... 52

N62X/N82X Optical Control Assembly ............................... 53

Front Box........................................................................... 53

Removal and Installation of Optical Control Assembly..... 53

Modes of Operation ............................................................ 54

AUTO Mode ...................................................................... 54

AUTO AC Operation ......................................................... 54

AUTO LP Gas Operation .................................................. 54

Shift from AUTO LP GAS to AUTO AC ............................. 54

No AC Power and No Flame.............................................54

Troubleshooting a "F"/"no" "FL" and "A"/"no" "AC" Faults 54

AC-Manual Mode .............................................................. 54

LP Gas–Manual Mode ...................................................... 54

No AC Power or Loss of AC Power ..................................55

Troubleshooting a "A"/"no" "AC" Fault..............................55

AC Power Restored ..........................................................55

Flame Fails to Ignite or Flame Goes Out .........................55

Clearing "Gas Lock-Out"................................................... 55

Troubleshooting a "F"/"no" "FL" Fault...............................55

N64X/N84X Optical Control Assembly ............................... 56

Front Box........................................................................... 56

Removal and Installation of Optical Control Assembly..... 56

Modes of Operation ............................................................ 57

AUTO ................................................................................ 57

AUTO AC Operation ......................................................... 57

AUTO LP Operation.......................................................... 57

Shift from AUTO LP GAS to AUTO AC ............................. 57

No AC Power and No Flame............................................. 57

Shift from AUTO LP GAS to AUTO AC ............................. 57

Troubleshooting No Flame and No AC Faults.................. 57

AUTO DC Operation – 3-Way Units Only......................... 58

AC-Manual Mode ................................................................ 58

No AC Power or Loss of AC Power ..................................58

AC Power Restored ..........................................................58

Troubleshooting "no" "AC" Fault....................................... 58

LP-Manual Mode................................................................. 59

Flame Fails to Ignite or Flame Goes Out .........................59

DC-Manual Mode................................................................ 59

No DC Power to DC Heater Circuit .................................. 59

Diagnostic Mode — Models N62X/N82X --------------60

Diagnostic Mode ................................................................. 60

Accessing the Diagnostic Mode ....................................... 60

Changing Screens ............................................................60

Exiting the Diagnostic Mode ............................................. 60

Screens and Diagnostic Segments Information ............... 61

Diagnostic Mode — Models N64X/N84X --------------63

Diagnostic Mode ................................................................. 63

Accessing the Diagnostic Mode ....................................... 63

Changing Screens ............................................................63

Exiting the Diagnostic Mode ............................................. 63

Screens and Diagnostic Segments Information ................. 64

Ice Maker --------------------------------------------------------66

Wire Harness ...................................................................... 66

Fill Tube .............................................................................. 66

Water Valve......................................................................... 66

Specifications...................................................................... 66

Replacing the Ice maker..................................................... 67

Ice Maker Troubleshooting Chart ....................................... 67

Cycle Test ........................................................................... 68

Water Fill Adjustment .......................................................... 69

Low Ice Yield....................................................................... 69

Water Valve Operation Test ................................................ 69

Water Valve Solenoid Resistance ...................................... 69

Mold Heater Resistance Check .......................................... 70

Checking Voltage at Motor Terminals................................. 70

Winterizing the Ice Maker Water ........................................ 70

N64X IM/N84XIM – Wiring Pictorial for Ice Maker Wired to

Refrigerator AC Cord ..........................................................70

N64X IM/N84XIM – Wiring Schematic for Ice Maker Wired to

Refrigerator AC Cord ..........................................................70

N64X IM/N84XIM – Wiring Schematic for Ice Maker Wired to

White AC Power Cord......................................................... 72

N64X IM/N84XIM – Wiring Pictorial for Ice Maker Wired to

White AC Power Cord......................................................... 72

ii Refrigerator Service Manual www.norcold.com/cda N6XX/N8XX Models

INTRODUCTION

About this Manual

This service manual provides maintenance, diagnostic, and repair information for NORCOLD® models N6XX and N8XX (N6XX/N8XX) gas absorption refrigerators. It is a reference tool designed for technicians who are knowledgeable in the theory and operation of gas/ electric absorption refrigerators, liquefied petroleum (LP) gas–propane–systems, and AC/DC electrical systems as installed in a variety of recreational vehicles (RV).

All information, illustrations, and specifications contained in this publication are based on the latest product information available at the time of publication.

NORCOLD® reserves the right to make changes at any

time without notice.

Model Identification

Models N61X, N81X, N62X, N82X, N64X, and N84X are 2-way refrigerators that operate on AC power or LP gas.

Models N64X.3 and N84X.3 are 3-way refrigerators, that operate on AC power , LP gas, or DC power .

Letter(s) appended to the model number identify factory installed accessories. For example, an N821F is a 2-way refrigerator equipped with a factory installed 12 Vdc cooling unit ventilation fan; an N641IM is a 2way refrigerator equipped with an ice maker.

Certification and Code Requirements

NORCOLD® N6XX/N8XX gas/electric absorption

refrigerators are certified under the latest edition of ANSI Z21.19B standards for installation in mobile homes or recreational vehicles, and with the Canadian Standards Association CAN/CGA-1.4-M94.

Electrical components are compliant.

About Installation

Refrigerator installation must conform with the N6XX/ N8XX Installation Manual for the NORCOLD® limited

warranty to be in effect. Installation must also comply with applicable local codes and standards set by the cognizant certification agency .

Replacement Parts

Use only authorized NORCOLD® replacement parts. Generic parts do not meet NORCOLD® specifications for safety , reliability , and performance. The use of unauthorized aftermarket or generic replacement parts voids the refrigerator's limited warranty coverage.

T echnical Assistance

If unable to resolve technical issues using the information provided in this manual, technical support is available through NORCOLD® Customer Service Center:

Information Label

The information label is located in the upper right corner of the fresh food compartment just below the divider. See Figure 1, p age 2. The label provides the following information:

n Serial number. n Model number. n LP gas (propane) pressure. n Btu/h. n AC voltage and amperage. n DC voltage and amperage. n Design certification. n Vent kit requirement.

Cooling Unit Serial Number

The cooling unit serial number appears on the cooling unit bar code label. The label is affixed to the surface of the cooling unit leveling chamber. See Figure 2, page 2.

' Telephone:.................................... 1-800-444-7210.

7 Fax:.............................................. 1-937-497-3183.

; World Wide Web: ......................www.norcold.com.

The following information is required to process technical support requests:

n Model number. n Serial number. n Make, model, and year of recreational vehicle.

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Figure 1. Refrigerator Information Label Location.

Figure 2. Cooling Unit Bar Code Label Location.

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Refrigerator Service ManualN6XX/N8XX Models

Safety Notice

It is not possible to anticipate all of the conceivable ways or conditions under which the refrigerator may be serviced or to provide cautions as to all of the possible hazards that may result. Standard and accepted safety precautions and equipment should be used when working on electrical circuits and handling toxic or flammable materials. Safety goggles and other required protection should be used during any process that can cause material removal, such as when removing a leaking cooling unit and cleaning components.

Attention Statements

The safety alert symbol  followed by the word WARNING or CAUTION identifies potential safety hazards or conditions.

Safety Statements

Do not modify, alter, or equip the refrigerator to the

use of any other fuel (natural gas, butane, etc.). N6XX/ N8XX refrigerators are designed and equipped for the use of LP gas–propane gas–only.

Incorrect installation, adjustment, alteration, or

maintenance of the refrigerator can cause personal injury, property damage, or both.

SAFETY AW ARENESS

The safety alert symbol with the appropriate heading appear on all safety labels posted on the refrigerator and safety awareness notices presented throughout this manual.

WARNING:

The above heading identifies hazards or conditions, which if ignored can cause serious injury , death, and/ or extensive property damage.

CAUTION:

The above heading identifies hazards, which if ignored can cause injury and/or property damage.

Do not use leak test solutions that contain ammonia

or chlorine. Ammonia and chlorine degrade copper and brass components.

The cooling unit is a sealed system under

pressure! Do not try to repair or recharge the cooling unit. Do not bend, drop, weld, drill, puncture, saw, or strike the cooling unit.

Do not smoke, light fires, or create sparks when

working on the propane gas system.

Do not use an open flame for leak testing any of the

propane gas system components. Propane gas is highly flammable and explosive.

Always use two wrenches to tighten or loosen LP gas

connections. Damaged connections, piping, and components create the potential for gas leaks.

All electrical connections and repairs to the

refrigerator must comply with all applicable codes. Refer to the certification and code requirements section of the N6XX/N8XX Installation Manual.

Do not work on live electrical circuits. Turn off AC

power and DC power sources before attempting to remove, service, or repair any of the refrigerator's electrical or electronic components.

Do not modify, bypass, or eliminate any of the

refrigerator's electrical components, electronic circuits, or propane gas system components.

Do not wet or spray liquids on or near electrical

connections or electronic components. Most liquids, including leak detection solutions, are electrically conductive and pose the potential for an electric shock hazard, short electrical components, damage electronic circuits, and/or ignite a fire.

Handle a leaking cooling unit with extreme

caution! The cooling unit contains ammonia, hydrogen, and sodium chromate. Ammonia can cause severe skin and eye burns. Hydrogen is highly flammable, can ignite and burns with an intense flame. Certain chromium compounds, such as sodium chromate, are carcinogenic.

Do not use extension cords. Do not remove the

grounding prong from the refrigerator AC power cord. Do not use a two prong adapter to connect the refrigerator to the AC outlet.

Do not over-fuse electrical circuits. Use specified

fuses and AWG wire sizes. The specification section of this manual provides fuse size information. Refer to the N6XX/8XX Installation Manual for the correct AWG wire size specifications.

Prevent child entrapment! Before disposing of the

refrigerator, remove all doors and fasten all shelves with retainers.

Some of the refrigerator's metal components have

sharp corners and edges. Wear hand protection, such as cut resistant gloves, and exercise extreme care when handling the refrigerator.

Make sure all hardware such as hinges and fasteners

(retaining screws, etc.), are properly fastened.

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SPECIFICATIONS

N61X/N81X Models

Storage volume

N61X --------------------------------------------------------------------------------------------------------------------------------- 6.3 ft3. N81X --------------------------------------------------------------------------------------------------------------------------------- 7.5 ft

Rough opening dimensions (H x W x D) N61X ------------------------------------------------------------------------------------------------------ 52 N81X ----------------------------------------------------------------------------------------------------- 59

in. x 23

1/2

in. x 24 in.

1/2

in. x 24 in.

Decorative panels dimensions

3/16

Thickness--------------------------------------------------------------------------------------------------------------------------Freezer door (H x W, both models)---------------------------------------------------------------------14

17/32

in. x 21

19/32

in.

in. Fresh food compartment (H x W) N61X ------------------------------------------------------------------------------------------------------------- 31 N81X ------------------------------------------------------------------------------------------------------------- 38

5/8

in. x 21

5/8

in. x 21

19/32 19/32

in. in.

Controls

Type ---------------------------------------------------------------------------------------------- Electronic with built-in diagnostics Mode selector switch ------------------------------------------------------------------------------------------ 3-position slide type T emperature switch--------------------------------------------------------------------------------------------- 5-position slide type Temperature settings ---------------------------------------------------------------------------------------------- 1=cold, 5=coldest T emperature sensor ----------------------------------------------------------------------------- Thermistor, fin mounted (10th fin)

Off-level operating limits

Side-to-side------------------------------------------------------------------------------------------------------- 3 degrees-maximum Front-to-back----------------------------------------------------------------------------------------------------- 6 degrees-maximum

DC power

Controls operating voltage ----------------------------------------------------------------------------------------- 10.5 t o 15.4 Vdc Fuse, control circuit (F1 in power board) -------------------------------------------- 5 A (tan color), automotive blade type Fuse, fan (N6XXF/N8XX F models with an in-line fuse)--------------------- 1 A,

in. x 1

in. AGC type fast acting

DC amperage draws (at nominal 12 Vdc) Automatic ignition----------------------------------------------------------------------------------------------------------------- 0.50 A Divider heater ---------------------------------------------------------------------------------------------------------------------- 0.25 A Fresh food compartment lamp ------------------------------------------------------------------------------------------------- 0.46 A Gas valve--------------------------------------------------------------------------------------------------------------------------- 0.146 A Fan (N6XX/FN8XXF models only)---------------------------------------------------------------------------------------------- 0.36 A

AC power

AC heater operating voltage ----------------------------------------------------------------------------------------- 108 to 132 Vac Fuse, AC heater circuit (F3 in power board)---------------------------------- 5 A,

in. x 1

in. AGC type fast acting

AC heater rating ------------------------------------------------------------------ 300 W/2.5 A @ 120 Vac (resistance of 48Ω)

LP gas (propane)

Operating pressure ---------------------------------------------------------------------------------------------- 10.5 to 11.5 in. w.c. Heat output--------------------------------------------------------------------------------------------------1500 Btu/h @ 11 in. w .c. Orifice ---------------------------------------------------------------------------------------------------------------------------------- LP16 Gas ignition---------------------------------------------------------------------------------- Automatic with flame sensing circuit Electrode tip-to-burner air gap---------------------------------------------------------------------------------------- 1/8 to 3/16 in.

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Refrigerator Service ManualN6XX/N8XX Models

N62X/N82X Models

Storage volume

N62X --------------------------------------------------------------------------------------------------------------------------------- 6.3 ft3. N82X --------------------------------------------------------------------------------------------------------------------------------- 7.5 ft

Rough opening dimensions (H x W x D) N62X ------------------------------------------------------------------------------------------------------ 52 N82X ------------------------------------------------------------------------------------------------------ 59

/8 in. x 231/2 in. x 24 in.

in. x 23

in. x 24 in.

Decorative panels dimensions

17/32

in. x 21

/16

19/32

in.

in. Fresh food compartment door N62X --------------------------------------------------------------------------------------------------------------31 N82X --------------------------------------------------------------------------------------------------------------38

in. x 21

/8 in. x 2119/32 in.

/32

in.

Controls

Type --------------------------------------------------------------------------------------- Electronic with built-in diagnostic mode ON/OFF/MODE/TEMP SET switches ------------------------------------------------------------------------ Flush push-button Temperature settings ---------------------------------------------------------------------------------------------- 1=cold, 9=coldest T emperature sensor ----------------------------------------------------------------------------- Thermistor, fin mounted (10th fin)

Off-level operating limits

DC power

Controls operating voltage ----------------------------------------------------------------------------------------- 10.5 to 15.4 Vdc Fuse, control circuit (F1 in power board) -------------------------------------------- 5 A (tan color), automotive blade type Fuse, fan (N6XXF/N8XX F models with in-line fuse) ------------------------- 1 A,

in. x 1

in. AGC type fast acting

AC power

AC heater operating voltage -----------------------------------------------------------------------------------------108 to 132 Vac Fuse AC heater circuit (F3 in power board)----------------------------------- 5 A,

in. x 1

in. AGC type fast acting

AC heater rating

Refrigerators with serial number lower than 854647 -----------------300 W/2.7 A @ 110 V ac (resist ance of 41.25 Ω) Refrigerators with serial number 854647 and higher --------- 300 W/2.5 A/48 Ω @ 120 Vac (resistance of 41.25 Ω)

LP gas (propane)

Operating pressure ---------------------------------------------------------------------------------------------- 10.5 to 11.5 in. w.c. Heat input----------------------------------------------------------------------------------------------------1500 Btu/h @ 1 1 in. w .c. Orifice, new style-------------------------------------------------------------------------------------------------------------------- LP16 Orifice, old style ----------------------------------------------------------------------------------------------------------0.155 jeweled Gas ignition---------------------------------------------------------------------------------- Automatic with flame sensing circuit Electrode tip-to-burner air gap --------------------------------------------------------------------------------------- 1/8 to 3/16 in.

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N64X/N64X.3/N84X/N84X.3 Models

Storage volume

N64X/N64X.3 ----------------------------------------------------------------------------------------------------------------------- 6.3 ft N84X/N84X.3 ----------------------------------------------------------------------------------------------------------------------- 7.5 ft3.

Rough opening dimensions (H x W x D) N64X/N64X.3 --------------------------------------------------------------------------------------------52 N84X/N84X.3 --------------------------------------------------------------------------------------------59

/8 in. x 231/2 in. x 24 in.

in. x 23

in. x 24 in.

Decorative panels dimensions

Thickness---------------------------------------------------------------------------------------------------------------------------

Freezer door (H x W, both models) ---------------------------------------------------------------------14

in. x 21

/32

/16

in. in.

/32

Fresh food compartment door N64X/N64X.3 ----------------------------------------------------------------------------------------------------31 N84X/N84X.3 ----------------------------------------------------------------------------------------------------38

in. x 21 in. x 21

19 19

/32 /32

in. in.

Controls

Type ------------------------------------------------------------------------------------ Electronic with built-in diagnostic function ON/OFF/MODE/TEMP SET switches ---------------------------------------------------------------------- Raised push-button Temperature settings ---------------------------------------------------------------------------------------------- 1=cold, 9=coldest T emperature sensor ----------------------------------------------------------------------------- Thermistor, fin mounted (10th fin)

Off-level operating limits

DC power

Controls operating voltage ----------------------------------------------------------------------------------------- 10.5 to 15.4 Vdc DC fuse (F1 in power board)------------------------------------------------------------ 5 A (tan color), automotive blade type DC heater rating -----------------------------------------------------------------225 W/16 A @14 Vdc (resist ance of 0.87 Ω) DC heater operating voltage (3-way models only) ------------------------------------------------------------------ 12 – 14 Vdc Fuse, DC heater (F2, in power board) ------------------------------------------- 30 A (green color), automotive blade type Fuse, fan (N6XXFw/N8XX F models with in-line fuse holder) -------------- 1 A,

in. x 1

in. AGC type fast acting

DC amp draws (at nominal 12 Vdc) Automatic ignition----------------------------------------------------------------------------------------------------------------- 0.50 A DC heater --------------------------------------------------------------------------------------- 13.79 A @ 12 Vdc/16 A @ 14 Vdc Divider heater ---------------------------------------------------------------------------------------------------------------------- 0.25 A Fresh food compartment lamp ------------------------------------------------------------------------------------------------- 0.46 A Gas valve--------------------------------------------------------------------------------------------------------------------------- 0.146 A Fan (N6XX/FN8XXF models only)---------------------------------------------------------------------------------------------- 0.36 A

AC power

AC heater operating voltage requirements ----------------------------------------------------------------------- 108 to 132 V ac Fuse AC heater circuit (F3 in power board)------------------------------------ 5 A,

in. x 1

in. AGC type fast acting

AC heater rating

Refrigerators with serial number lower than 854647 -----------------300 W/2.7 A @ 110 V ac (resist ance of 41.25 Ω) Refrigerators with serial number 854647 and higher -------------------- 300 W/2.5 A @ 120 V ac (resist ance of 48 Ω)

LP gas (propane)

Operating pressure ----------------------------------------------------------------------------------------------- 10.5 to 11.5 in. w.c Heat input-----------------------------------------------------------------------------------------------------1500 Btu/h @ 11 in. w .c Orifice, new style-------------------------------------------------------------------------------------------------------------------- LP16 Orifice, old style ----------------------------------------------------------------------------------------------------------0.155 jeweled Gas ignition---------------------------------------------------------------------------------- Automatic with flame sensing circuit Electrode tip-to-burner air gap --------------------------------------------------------------------------------------- 1/8 to 3/16 in.

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Refrigerator Service ManualN6XX/N8XX Models

TROUBLESHOOTING – QUICK REFERENCE GUIDE

Problem Possible Cause Checks/Reference

The refrigerator does not turn ON.

The refrigerator does not cool on AC power.

The refrigerator does not cool efficiently on AC power.

3-Way Units Only

The refrigerator does not cool on DC power.

3-Way Units Only

The refrigerator does not cool efficiently on DC power.

No 12 Vdc power to refrigerator. Faulty/loose 12 Vdc connections. F1 fuse in power board open.

No AC power to refrigerator. F3 fuse in the power board open. AC heater failed open.

Ventilation obstructed. AC voltage low.

F2 fuse in power board open. DC heater failed open.

Ventilation obstructed. DC voltage below 12 volts.

See page 11. Check 12 Vdc connections. Check fuse F1, (5 amp) in power board.

See page 16. Check fuse F3, (5 amp) in power board. See page 18.

Check enclosure for air flow obstructions. See page 17.

Check fuse F2 (30 amp) in power board. See page 15.

Check enclosure for obstructed air flow. Check RV 12 Vdc power supply.

The refrigerator does not operate on LP gas.

The refrigerator does not cool efficiently on LP gas.

"no" "co" code.

No LP gas. Incorrect electrode tip-to-burner gap. Faulty spark/sense electrode assembly. Flame sensing circuit failure.

Ventilation obstructed. Incorrect LP gas pressure. Dirty burner. Missing flue baffle. Heat deflector blocked.

Poor ventilation. Off-level operation. DIrty burner. Low AC voltage. Cooling fan inoperative. Improper installation. Incorrect orifice.

Check LP gas supply and valves. See page 12. See page 12. See page 13.

Check enclosure for obstructed air flow. See page 12. See page 12. See page 30. See page 30.

Check enclosure for obstructed air flow. See page 37. See page 31. See page 34. See page 35. See pages 22-26. See page 29.

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N61X/N81X DISPLA YED FAUL T CODES

Problem

ON LED off.

ON LED and GAS LED flashing at one second

intervals.

ON LED on. GAS LED flashes at one second intervals.

ON LED flashes once every three seconds.

Probable Cause

Refrigerator turned off. No 12 Vdc to refrigerator. F1 fuse open.

In AUTO operation: No AC power or LP gas available

GAS operation: Burner failed to ignite or reignite.

"Gas lock-out." Burner failed to ignite or reignite.

Back-up system operation.

Reference

See page 11.

See page 16.

See page 12.

See page 20.

ON LED flashes twice every three seconds.

ON LED flashes three times every three

seconds.

ON LED flashes four times every three seconds.

ON LED flashes five times every three seconds.

Mode switch failure. Refrigerator operating in last selected mode.

AC heater failure.

Controls failure.

No cooling detected by the controls.

Replace optical control assembly.

See page 18.

Replace power board.

See pages 21 & 37.

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Refrigerator Service ManualN6XX/N8XX Models

N62X/N82X DISPLA YED FAUL T CODES

Blank

Display

Screen

Probable Cause

Refrigerator turned off. No 12 Vdc to refrigerator. F1 fuse open.

Burner failed to ignite or reignite.

Flame sense circuit failure.

DC voltage low.

DC voltage high.

ReferenceCode

See page 11.

See page 12.

See page 13.

See page 14.

Flashing

Tem p

Setting

AC relay stuck closed.

No AC power available to refrigerator. AC cord not plugged into power board. F3 fuse open.

AC heater failed open.

Fresh food compartment door open more then 2 minutes. Lamp reed relay switch faulty.

Back-up operating system.

No cooling detected by the controls.

See page 16.

See page 18.

See page 19.

See page 20.

See pages 21 & 37.

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N64X/N84X DISPLA YED FAULT CODES

Code

Blank

Display

Screen

Probable Cause

Reference

Refrigerator turned off. No 12 Vdc to refrigerator.

See page 11.

F1 fuse open.

Audible

Alarm

Audible

Alarm

Audible

Alarm

Audible

Alarm

Audible

Alarm

Audible

Alarm

The burner failed to ignite or reignite.

Flame sense circuit failure.

DC voltage low.

DC relay stuck closed, 3-way models only.

DC voltage high.

DC heater failure, 3-way models only.

No AC power available to refrigerator. AC cord not plugged into power board. F3 fuse open.

AC relay stuck closed.

See page 12.

See page 13.

See page 14.

See page 15.

See page 16.

Flashing

Tem p

Setting

AC voltage low.

AC voltage high.

Audible

AC heater failed open.

Alarm

See page 17.

See page 18.

Audible

Fresh food compartment door open more than 2 minutes. Lamp reed relay switch faulty.

See page 19.

Alarm

Back-up operating system.

Audible

No cooling detected by the controls.

Alarm

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Refrigerator Service ManualN6XX/N8XX Models

See page 20.

See pages 21 & 37.

TROUBLESHOOTING FLOWCHARTS

Blank Display – Refrigerator does not turn on

Before beginning this procedure make sure:

■

The RV DC power system is supplying 10.5 to 15.4 volts to the refrigerator.

■

No other RV appliances or lighting circuits are connected to the refrigerator DC circuit.

■

12 Vdc input to the power board is wired according to the N6XX/N8XX installation manual.

Models and fault indicator displayed.

GAS

check if flashing

N61X/N81X

Measure voltage at power

board 12VDC and GND1 connections.

Check condition of F1 fuse

in power board. See Figure A.

Measure voltage at optical

control harness. See Figure B.

AUTO

N62X/N82X

10.5

15.4 Vdc?

YES

F1 fuse okay?

YES

Voltage

present?

Blank Display Screen

LP GASAC

Blank

Display

Screen

N64X/N84X

1. No DC power input from RV to unit.

2. Faulty wiring or connectors.

Replace fuse. Use a standard 5 amp (tan color) automotive blade type fuse.

Replace power board.

Good= 00.0

Ω

Bad = OL

T E M

00.0

X A M

I M

H L

A M

D 2

F F

AX M A

I T

AX M

M A

U F

Checking DC fuse continuity.

Figure A.

YES

Replace optical control board.

Wire harness optical control display connector

White/violet wire

White/red wire

10.5 to 15.4 Vdc

TRUE RMS MULTI METER

III

MIN MAX RANGE HOLD

HzREL

PEAK MIN MAX

4 1/2 DIGITS

1 Seconds

µA

OFF

COM

mA µA

400mA MAX

CAT II

FUSED

1000V MAX

10A MAX

FUSED

Optical control display wire harness connection voltage measuring points.

Figure B.

www.norcold.com/cda 11N6XX/N8XX ModelsRefrigerator Service Manual

F/no FL Fault Code – Burner failed to ignite or reignite

Before beginning this procedure make sure:

■

RV LP gas tank valve is open.

■

Refrigerator solenoid gas valve manual shutoff is open.

■

LP gas pressure at the solenoid gas valve pressure tap is 10.5.

Models and fault indicator displayed.

GAS

N61X/N81X

Check burner.

GAS LED flashing constantly

AUTO

N62X/N82X

LP GASAC

N64X/N84X

Audible

Alarm

Check that electrode tip-toburner air gap is correct.

Check spark/sense electrode assembly for continuity.

Check gas valve solenoid resistance.

Burner clean?

YES

Air gap

1/8 to 3/16

inch?

YES

Continuity?

YES

79 to 85 Ω?

Clean and service burner. See page 30.

Set electrode-to-burner air gap 1/8 to 3/16 inch.

Replace spark/sense electrode assembly.

Replace gas valve.

Check gas valve solenoid wires for continuity.

Check voltage across power board terminals GV and GV GND.

YES

Continuity?

YES

Voltage?

YES

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Replace gas valve wires.

Replace power board.

Faulty or obstructed gas valve. Replace gas valve.

Refrigerator Service ManualN6XX/N8XX Models

S/Sr Fault Code – Flame sense circuit failure

Models and fault indicator displayed.

LP GASAC

AUTO

N62X/N82X N64X/N84X

Flame sense circuit failure.

Replace power board. See page 44.

dc LO Fault Code – Low DC voltage

Before beginning this procedure:

■

Make sure RV DC voltage to refrigerator is 10.5 to 15.4 volts.

■

Determine if the DC LO fault code displays when the converter is the source of DC power.

■

Make sure no other appliance or lighting circuit is connected to the refrigerator DC circuit.

Models and fault indicator displayed.

N64X/N84X

Check for DC voltage input to power board terminals 12VDC and GND1.

Audible

Alarm

Voltage

lower than

10.5 Vdc?

YES

Check RV 12 Vdc power supply to refrigerator.

See NOTE below to determine and correct low dc LO fault.

NOTE

Electronic controls operate on 12 Vdc. When an AC/DC converter is used to supply DC power, the refrigerator circuit must be connected to the appliance output terminals of the converter (filtered side).

If the refrigerator circuit is connected to the unfiltered side, the AC ripple generated by the converter may cause a dc LO fault code to display .

T o troubleshoot a dc LO fault, connect a charged 12 volt automotive battery to the power board. If the dc LO code clears, the fault was caused by unfiltered DC power.

If the dc LO code does not clear, replace the power board.

www.norcold.com/cda 13N6XX/N8XX ModelsRefrigerator Service Manual

dc HI Fault Code – DC voltage high

Before beginning this procedure:

■

Make sure RV DC voltage to refrigerator is 10.5 to 15.4 volts.

■

Determine if the DC HI fault code displays when the converter is the source of DC power.

Models and fault indicator displayed.

AUTO

LP GASAC

Audib

N62X/N82X

Check for DC voltage input to power board terminals 12VDC and GND1.

If the refrigerator circuit is connected to the unfiltered side, the AC ripple generated by the converter may cause a dc HI fault code to display .

T o troubleshoot a dc HI fault, connect a charged 12 volt automotive battery to the power board. If the dc HI code clears, the fault was caused by unfiltered DC power. If the dc HI code does not clear , replace the power board.

Voltage

higher than

15.4 Vdc?

NOTE

YES

N64X/N84X

Check RV DC power distribution to refrigerator.

See NOTE below to determine and correct low dc HI fault.

Alarm

dc rE Fault Code – DC relay stuck closed

Models and fault indicator displayed

N64X/N84X

DC relay stuck closed.

Audib

Alarm

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Replace power board. See page 44.

Refrigerator Service ManualN6XX/N8XX Models

dc HE Fault Code – DC heater failed open

Before beginning this procedure make sure:

■

The RV DC electrical system is maintaining 10.5 to 15.4 Vdc to the refrigerator.

■

No other appliance or lighting circuit is connected to the refrigerator DC circuit.

Model and fault indicator displayed.

Audible

N64X.3/N84X.3

Check condition of F2 fuse in power board.

Check DC heater resistance. See Figure.

Alarm

F2 fuse

okay?

YES

Resistance

0.81 to 0.91

YES

Ω

Replace fuse. Use a standard 30 amp (green color) automotive blade type fuse.

Replace DC heater.

Replace power board.

DC heater resistance 0.81 to 0.91

www.norcold.com/cda 15N6XX/N8XX ModelsRefrigerator Service Manual

Ω.Ω.

Ω.

Ω.Ω.

A/no AC Fault Code – No AC power available

Before beginning this procedure make sure:

■

No other problem exist with the RV AC power supply.

■

No other appliances or lighting circuits are connected to the refrigerator AC circuit.

■

Extension cords are not being used to supply AC power to the refrigerator.

Models and fault indicator displayed.

GAS

check if flashing

Does not operate on AC when set to AUTO.

N61X/N81X

Measure voltage at power

board AC cord connection.

Check condition of F3 fuse

in power board.

AUTO

N62X/N82X

108

132 Vac?

YES

F3 fuse okay?

YES

Audib

LP GASAC

Alarm

N64X/N84X

1. Check AC power input from RV to unit.

2. Check for faulty AC power cord.

Replace fuse. Use a 5 amp, 1/4" x 11/4" AGC type fuse.

Check that fuse holder clips are making full contact with fuse.

Clips okay?

YES

r/AC rE Fault Code – AC relay stuck closed

Models and fault indicator displayed.

LP GASAC

AUTO

N62X/N82X

Flame sense circuit failure.

Adjust clips to ensure fuse contacts are firm in clips and making full contact.

Replace power board.

Audib

Alarm

N64X/N84X

Replace power board. See page 44.

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Refrigerator Service ManualN6XX/N8XX Models

AC LO Fault Code – AC voltage low

Before beginning this procedure:

■

Determine if a certain AC power source sets the AC LO fault code (generator, shore power, inverter).

■

Make sure no other appliance or lighting circuit is connected to the refrigerator AC circuit.

■

Make sure extension cords are not being used to supply AC power to the refrigerator.

Model and indicator displayed.

Audib

N64X/N84X

Measure voltage at power board AC cord connection.

Alarm

Voltage

lower than

108 Vac?

YES

Fault related to RV AC power distribution

component or circuit supplying AC power to refrigerator.

Replace power board.

AC HI Fault Code – AC voltage high

Before beginning this procedure:

■

Determine if a certain AC power source sets the AC HI fault code (generator, shore power, inverter).

Model and indicator displayed.

N64X/N84X

Measure voltage at power board AC cord connection.

Audible

Alarm

Voltage

higher than

132 Vac?

www.norcold.com/cda 17N6XX/N8XX ModelsRefrigerator Service Manual

YES

Fault related to RV AC power distribution

component or circuit supplying AC power to refrigerator.

Replace power board.

H/AC HE Fault Code – AC heater failed open

Before beginning this procedure make sure:

■

RV AC voltage to the refrigerator is 108 to 132 volts.

■

No other appliance or lighting circuit is connected to the refrigerator AC circuit.

Models and indicator displayed.

Flashin

g 3 tim

es e

very 3 seco

nds

GAS

N61X/N81X

Check AC heater wires for loose or damaged connector.

AUTO

N62X/N82X

LP GASAC

Heater

connections

okay?

YES

N64X/N84X

Repair or replace connectors. If connectors cannot be repaired, replace heater.

Audible

Alarm

Check AC heater resistance. See See Figure.

Resistance

Ω

38 to 53

YES

AC heater resistance 38 to 53

Replace AC heater.

Replace power board.

Ω.

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Refrigerator Service ManualN6XX/N8XX Models

d/dr Fault Code – Door open for more than 2 minutes

Before beginning this procedure make sure:

■

Light/thermistor connector and wire harness connector are fully engaged and locked.

Models and fault indicator displayed.

LAP GASAC

AUTO

N62X/N82X

Check that the door latch striker plate is adjusted correctly.

Striker plate

okay?

YES

N64X/N84X

Adjust striker plate.

Audib

Alarm

Check for correct door installation. See NOTE below.

Was door

swing

changed?

YES

Food Compartment Lamp Switch

The reed relay switch that turns the fresh food compartment light on and off is an integral component of the optical control display board circuitry .

Lamp Switch Operation

The magnetic pull from a permanent magnet located underneath the top door trim maintains the switch contacts open (light off) when the door is fully closed. Opening the door breaks the magnetic pull, which in turn causes the switch contacts close (light on).

NOTE

Always follow the instructions provided in the Owner's Manual to change the refrigerator door swing. The bottom door trim does not have a magnet. Inverting the doors will required non-approved modifications and will cause the fresh food compartment light to remain on when the door is closed.

Test lamp switch operation. See switch

test procedure below.

Check for location of magnet if the door swing was changed. See NOTE.

Move tip

Magnetic tip screwdriver

Lamp Switch Testing Procedure

1. Slide a magnetic screwdriver tip or a small magnet on the underside of the optical control assembly as shown in the figure above.

2. Check the food compartment light as the screwdriver tip is moved under the display , the light:

a. should turn off when the magnetic screwdriver tip or magnet passes under the optical control assembly.

b. turn on when the magnetic screwdriver tip or magnet is distanced from the underside of the optical control assembly.

3. If the light does not turn off when the magnet passes under the optical control display , replace the optical control display assembly .

www.norcold.com/cda 19N6XX/N8XX ModelsRefrigerator Service Manual

Thermistor Failure Fault – Controls in backup operating system mode

Before beginning this procedure:

■

Make sure lamp/thermistor assembly is connected to wire harness.

Models and fault indicator displayed.

Flash

ing

once every 3 seconds

GAS

N61X/N81X

Check lamp/thermistor wire assembly and connector for dirty/broken connections.

Lamp

Connection

Thermistor

Connections

AUTO

Wires and

connector

good?

YES

Temp

Setting

Flashing

LP GASAC

Temp

Setting

Flashing

N64X/N84XN62X/N82X

T IME

MS R

III

I M

I IG

A M

Clean/repair terminals or connector as required. See Figure A.

Check thermistor resistance. See Figure B and procedure below.

Temperature* Resistance* (oF) (k ) 85 8.1– 9.0 80 9.1–10.0 75 10.1–11.0 70 11.1–12.0 60 12.1–13.0 50 15.5–16.5 40 22.5–23.5 35 24.5–25.5 33 28.5–29.5 32 30.0–32.0

Approximate Values

Thermistor

Figure A. Figure B.

Backup Operating System (BOS)

The backup operating system (BOS) is an electronically controlled duty cycle that maintains the refrigerator in operation if the thermistor is disconnected or fails. The BOS maintains cooling by timing the length of time the heat source is energized. When the refrigerator is operating in BOS, the length of the cooling cycle has to be regulated manually using the TEMP switchbutton.

When a colder temperature is desired, changing the temperature setting to a higher number provides additional cooling by lengthening the cooling cycle. For example, if the temperature setting is set to 5, raising the setting to 6 will lengthen the cooling cycle.

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Thermistor packed in ice bath

When a warmer temperature is desired, changing the temperature setting to a lower number shortens the cooling cycle. For example, if the temperature setting is set to 6, lowering the setting to 5 will shorten the cooling cycle.

N61X/N81X Backup Operation.

When the N61X/N81X controls shift to BOS operation, the ON LED (green) flashes once every three seconds.

N62X/N82XN64X/N84X Backup Operation

When the N62X/N82XN64X/N84X controls shift to BOS operation, the temperature setting flashes for ten seconds when the TEMP button is pressed. Af ter ten seconds, the selected operation mode indicator displays.

Refrigerator Service ManualN6XX/N8XX Models

n/no co Fault Code – No cooling detected by the controls

Models and indicator displayed.

ON LED flashing

5 times e

GAS

3 seconds

N61X/N81X

Check for cooling at fin assembly.

very

AUTO

N62X/N82X

Cooling

detected?

YES

LP GASAC

N64X/N84X

1. Check for ventilation obstructions

and leveled operation.

2. Reset power board as shown in figure and described in procedure.

3. Allow unit to operate normally.

Audible

Alarm

Check for completion of cooling cycle after resetting power board.

"no" "co"

code shows

before cycle

end?

YES

Power Board Resetting Procedure

1. Turn OFF the refrigerator .

2. Disconnect the following from power board: a. 12 Vdc positive and negative wires. b. AC power cord. c. Solenoid gas valve wires. d. Spark/sense electrode assembly wires.

3. Remove the power board cover.

4. Reconnect 12 Vdc positive and negative wire.

5. Turn ON the refrigerator.

6. Locate Pin 15 on 16 pin connector (P1). Pin 15 is the empty socket to the right of the white/violet wire on the top row. See Figure C.

7. Using an insulated jumper wire, short Pin 15 to the power board ground lug for 10 - 15 seconds. A click sound will indicate when the controls are reset. See Figure C.

NOTE

A jumper wire to short Pin 15 to ground can be made from a six inch long insulated 22 A WG wire with a 1/2 inch of insulation stripped from each end.

8. Turn OFF the refrigerator .

9. Turn ON refrigerator . If "n" or "no co" code displays, repeat steps 7 - 9.

White/violet wire

Cooling unit is good. Recheck for ventilation obstructions and leveled operation.

Replace cooling unit if "no" "co" shows

before completing a full cooling cycle.

2. Reset power board as shown in figure and described in procedure.

Pin 16

To pin 15

22 AWG with 1/2" long stripped ends

Insulated wire jumper

Figure C. Resetting Power Board.

10. Turn OFF the refrigerator . 1 1. Disconnect the 12 Vdc power positive and negative

wires from the power board.

12. Install the power board cover.

13. Reconnect the following to the power board: a. Spark/sense electrode assembly wire. b. Solenoid gas valve wires. c. AC power cord. d. 12 Vdc positive and negative wires from the

power board.

14. Place refrigerator in service.

Ground Lug

www.norcold.com/cda 21N6XX/N8XX ModelsRefrigerator Service Manual

Errata Sheet, 01/16/04

VENTILATION

Roof Exhaust Venting

NOTE

The general guidelines for intake vents and roof exhaust vents presented in this section do not replace the instructions and/or guidelines provided in the N6XX/ N8XX model refrigerator installation manual and the Ventilation Guidelines For Gas/Electric Refrigerators, part number 622090A (3-01). Refer to the N6/N8 installation manual and Ventilation Guidelines For Gas/ Electric Refrigerators for the latest information on approved vents, installation instructions, and special construction exceptions.

Air Intake V ent

The ventilation and combustion air flow into the enclosure through the air intake vent. See Figure 3 and Figure 4, page 23.

RV front RV rear

Roof exhaust vent

The space between the air intake vent and the rear of the refrigerator must be kept clear at all times. Any obstruction in this area may cause serious ventilation problems. The air intake vent opening is also the access for servicing cooling unit components.

Roof Exhaust Vent

The heat absorbed by ventilation air and combustion gases flow out of the enclosure through the roof exhaust vent. See Figure 3 and Figure 4, page 23.

The roof exhaust vent is equipped with non removable metal mesh screen that prevent leaves, debris, birds or rodents from getting into the enclosure. The roof cap is fastened to the exhaust vent with four screws. The cap is always installed with the slope towards the front of the RV.

Exhaust vent screen

Baffle

Full width of enclosure

to isolate the top of refrigerator

from rejected heat

Condenser

1/8 inch maximum

if wider (see Figure 4)

Absorber coils

1/4 inch or less

1 inch maximum.

If wider, see Figure 5.

Intake vent

Figure 3. Roof Exhaust Venting Arrangement.

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Refrigerator Service ManualN6XX/N8XX Models

Top baffle

Required when the clearance from the underside of the roof to the top of the refrigerato exceeds 1/4 inch.

Condenser

Side wall baffles Required when the clearance between the enclosure side walls and refrigerator exceeds 1/8 inch.

Absorber coils

Intake vent

Figure 4. Rear View–Roof Exhaust Venting.

Baffles

The minimum and maximum clearances for installing the refrigerator or correcting ventilation problems on roof vented units are listed in Table 1. Baffles are required whenever installations exceed maximum clearances listed in Table 1. Figure 4 shows baffle locations.

Vertical Angled Baffles

Vertical angled baf fles are required when the roof exhaust vent is installed inboard of the condenser . Figure 5 shows the angled vertical baffles required on inboard roof vent installations. The horizontal wall baffles are required whenever the distance between the cooling unit and the interior surface of the outside wall exceeds one inch.

Minimum Maximum

Bottom 0 inch 0 inch

Sides (each) 0 inch 1/8 inch

Top 0 inch 1/4 inch

Angled baffles Required when the roof exhaust vent is inboard of the condenser.

1/4 inch

or less

Condenser

Baffles Required when the opening between the outside wall and cooling unit is over 1 inch.

Air intake vent

Rear 0 inch 1 inch

Table 1. Clearances for Roof Vented Installations.

www.norcold.com/cda 23N6XX/N8XX ModelsRefrigerator Service Manual

Figure 5. Baffles Required for an Inboard

Roof Exhaust Vent Inst allation.

Double Sidewall Venting

NOTE

Ventilation Guidelines For Gas/Electric Refrigerators

part number 622090A (3-01). Refer to the N6XX/N8XX installation manual and Ventilation Guidelines For Gas/ Electric Refrigerators for the latest information on approved vents, installation instructions, and special construction exceptions.

With increased installation of refrigerators in RV slide outs. NORCOLD has conducted extensive testing to develop venting guidelines for double sidewall vent applications. This work was done to ensure NORCOLD refrigerators meet the ANSI Z21.19 standards for cooling performance when used in slide out applications.

The challenge with slide out installations is that the "chimney effect" that is present with roof vent installations is not as strong in slide outs. To improve the "chimney effect" side vent installations must have fans and baffles. These fans and baffles direct the air flow through the surfaces of heat rejecting components. NORCOLD has determined that the following three key design considerations optimize heat removal in slide out applications.

An additional challenge with double sidewall venting is the depth of the enclosure. The deeper the enclosure, the greater the impact on the air flow through the rear of the refrigerator. Taking the three key design considerations and the variable depth requirement into account, NORCOLD developed and tested several baffle arrangements for the N6XX and N8XX models versus their ability to meet the ANSI st andards.

As the result of this testing, NORCOLD was able to reduce the baffle configuration down to two baffles for the N6XX and N8XX models. It should be noted that baffle arrangements are different if the enclosure depth is greater or less than 26 inches. The baffle configurations are shown in Figure 6, page 25, and Figure 7, page 26.

Air Intake Vent

The ventilation and combustion air flow into the enclosure through the air intake vent. See Figure 6, page 25 and Figure 7, page 26.

Sidewall Exhaust Vent

The heat absorbed by ventilation air and combustion gases flow out of the enclosure through the sidewall exhaust vent. See Figure 6, page 25, and Figure 7, page 26 for details.

n Refrigerators installed in slide outs must have a fan

or fans to assist air flow. Fan kits and refrigerators with factory installed fan(s) are available from NORCOLD.

n Fresh air must be directed to flow through the

surface areas of the absorber coils, condenser fins, and the outer surface of the canister.

n Corners and structural pockets where heated air

may stagnate must be reduced in size or completely eliminated.

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Refrigerator Service ManualN6XX/N8XX Models

Figure 6. Baffle Arrangement for Enclosures Depths of More than 24 Inches and Less than 26 Inches.

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Figure 7. Baffle Arrangement for Enclosures with Depths of 26 Inches or Greater .

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Refrigerator Service ManualN6XX/N8XX Models

DC connections

Gas valve

Burner tube

LP GAS SYSTEM

Canister

Flue tube

Baffle

Gas inlet fitting

Gas outlet fitting

Pressure

test port

When working on or near the LP gas system:

n Do not smoke or light fires! Extinguish all open

flames!

n Do not use an open flame to leak test any of the

LP gas system components. LP gas is highly flammable and explosive.

Manual shut-off

(shown closed)

WARNING:

LP gas supply

Figure 8. LP Gas System Components.

Electrode

Burner

Orifice assembly

(LP16 orifice shown)

Burner box base

Testing for LP Gas LeaksPressure Requirements

WARNING:

Do not wet or spray liquids on or near electrical connections or electronic components. Many liquids, including leak detection solutions, are electrically conductive and can create an electric shock hazard, short electrical components, and/or damage electronic circuits.

n Do not connect the refrigerator directly to the LP

gas tank. Always use an approved pressure regulator between the LP gas tank and the refrigerator LP gas system.

n To prevent damage to connections, piping, and

components, always use two wrenches to tighten or loosen connections. Damaged connections, piping, and components create the potential for gas leaks.

The refrigerator LP gas system, shown in Figure 8, is for propane gas use only . The system working pressure is 10.5 and 1 1.5 in. water column. Propane gas pressures below 10.5 in. w.c. or above 11.5 in. w.c. will af fect heat output which in turn will af fect cooling efficiency . Propane gas flow control is monitored by electronically by the controls flame sensing circuit. If the flame sensing circuit does not detect a burner flame within 30 seconds after initiating ignition, power to the gas valve is turned off and gas mode is locked out.

CAUTION:

Do not use leak test solutions that contain ammonia or chlorine. Ammonia and chlorine attack copper and brass components.

Leak testing can be accomplished using an electronic leak detector or a commercial grade leak test solution. The use of home made soap and water leak test solution should be avoided if possible. When applying leak test solutions, apply the solution over the entire joint using a small brush or spray applicator.

Due to low system operating pressure, it may take a few minutes for bubbles to appear if the connection is leaking. Hidden joints should be examined thoroughly using an inspection mirror.

www.norcold.com/cda 27N6XX/N8XX ModelsRefrigerator Service Manual

Errata Sheet, 01/16/04

Components

When working on the refrigerator LP gas system:

DC connecti ons

Mounting bracket

n Do not alter or modify the burner tube anti-vibration

loop.

n Do not cross thread fittings. Exercise extreme care

when connecting and disconnecting propane gas components.

n Leak test all of the refrigerator propane gas system

fittings after servicing, replacing, or repairing any LP gas system component.

Solenoid Gas Valves

Units with serial number 657908 or higher (manufactured on or after February 16, 1999) are equipped with the new style solenoid gas valve . See Figure 9.

Units with serial numbers lower than 657908, (models manufactured before February 16, 1999) are equipped with the old style solenoid gas valve. See Figure 10.

The electronic controls automatically operate the solenoid gas valve.

New Style Solenoid Gas Valve

The new style solenoid gas valve manual shut off and pressure tap are integrated in the valve’s body . The valve's manual shut-off is a spring-loaded, quarter turn manually operated valve.

T o manually shut-of f gas to the burner , pull the handle slightly away from the body , then turn it one-quarter turn (90 degrees) counterclockwise.

Old Style Solenoid Gas Valve

Refrigerators with serial numbers lower than 657908, (models manufactured before February 16, 1999) are equipped with the old style solenoid gas valve. See Figure 10.

Solenoi d

Gas inl et

Gas outl et fi tti ng

Gas pressure test port

Manual shut-off

fi tti ng (from RV LP gas)

(shown c l osed)

Figure 9. New Style Solenoid Gas Valve.

Solenoid

Gas valve

DC connections

Gas pressure test port

Gas outlet fitting

Gas inlet fitting (from RV LP gas system)

Use a NORCOLD® gas valve conversion kit, part number 621334, to replace an old style solenoid gas valve assembly .

Solenoid Gas Valve Connections

The solenoid gas valve inlet fitting is 3/8 inch, male threads; the outlet fitting is 1/4 inch, male threads.

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Manual shut-off

(shown open)

Mounting bracket

Figure 10. Old Style Solenoid Gas Valve.

Refrigerator Service ManualN6XX/N8XX Models

Orifice

The orifice controls the flow of propane gas to the burner. When replacing the orifice always use the size orifice specified. Using the wrong size or a damaged orifice will alter the amount of propane flowing to the burner.

N62X/N64X units with serial number 886961 and higher and N82X/N84X units with serial number 889988 and higher are equipped with an LP16 cap type orifice. All other units with serial numbers lower than those listed were originally equipped with an 0.155 jeweled orifice. See Figure 1 1.

WARNING:

Do not separate cap style LP16 orifice from its adapter . Separating the assemblies breaks the seal and causes an LP gas leak.

WARNING:

Do not use compressed air to clean a jeweled type orifice. The air pressure may dislodge the orifice from the adapter.

0.155

0.155 Jeweled orifice assembly

Cap type LP16 orifice assembly

Figure 11. 0.155 and LP16 orifice assemblies.

CAUTION:

Do not install cap style LP16 orifice in a burner that uses a jeweled type orifice or vise versa. The orifice adapter's threads are not compatible. Each orifice must be matched to its burner .

Burner

The burner, see Figure 12, provides primary air access and acts as the fuel mixing chamber to support ignition and the combustion of propane gas. Primary combustion air flows into the burner through three circular openings. Any obstruction blocking any of the three openings will have an effect on the fuel/air mixture. Insufficient combustion air will cause carbon deposits to clog the burner slots. Carbon clogged burner slots along with heavy dirt deposits in the burner are the main cause of no cooling or poor cooling performance when the refrigerator is operating in LP gas mode.

Burner Tube

The burner tube is 1/4 inch OD aluminum tubing with an anti-vibration loop and a double flare at each end. See Figure 13.

Figure 12. Burner.

Burner connection

Gas valve connection

Figure 13. Burner tube.

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Flue

The flue on all N6XX/N8XX terminates a few inches above the canister. See Figure 14. The flue comes equipped with a removable baffle ("spiral baffle") and a metal heat deflector .

The flue and its components should be checked annually . In roof exhaust venting applications, the refrigerator must be removed from the enclosure to check or service the flue or any of its components.

In most sidewall exhaust venting applications, removal of the side wall exhaust vent provides clear access to service the flue or any of its components.

A one inch diameter , loop-handle, twisted wire brush with a 27 inch wire handle is recommended for sweeping clean the flue.

Heat Deflector

The heat deflector, see Figure 14, deflects hot exhaust gases to the sides. It also keeps dirt and debris from getting into the flue. Cooling performance may be affected if the heat deflector is not installed or is not installed correctly .

Spiral Baffle

The spiral baffle, see Figure 14, traps and transfers heat to the cooling unit generator.

Heat deflector

Flue

Baffle retaining wire

Baffle

Burner box

Figure 14. Flue and Components.

Retaining wire

A retaining wire suspends the spiral baffle in the flue just above the flame. See Figure 15. The spiral baffle should be checked annually . To remove the spiral baffle from the flue:

1. Remove the heat deflector.

2. Unclip the baffle retaining wire from the rim of the flue.

3. Pull the baffle out of the flue tube.

CAUTION:

Do not cut or modify the spiral baffle retaining wire! The wire positions the baffle for optimal heat

transfer.

Flame Appearance

The flame should be light blue with sharp blue root cones and a steady burning flame plume. See Figure

16.

A flame that is mostly orange or yellow, is erratic, and unstable, indicates a "dirty" burner . Burner cleaning procedures appear on page 30.

Baffle

Figure 15. Flue Baffle.

Light blue steady flame with sharp blue cones

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Figure 16. Flame Appearance.

Refrigerator Service ManualN6XX/N8XX Models

Burner Cleaning Procedure

WARNING:

Burn hazard! Allow the burner box and burner components to cool before attempting to service the burner assembly or components.

CAUTION:

Do not use compressed air to clean a jeweled type orifice. The air pressure may unseat the jewel orifice insert from the adapter.

1. Turn OFF power to the refrigerator .

2. Close the LP gas tank valve.

Step 3 through Step 5, refer to Figure 17, page 32

3. Close the combination gas control valve manual shut-off.

4. Remove the drip cup.

CAUTION:

To prevent damage to connections, piping, and components, always use two wrenches to loosen the burner tube. A damaged burner tube creates a potential for gas leaks.

5. Remove the burner box cover.

Step 6 through Step 8, refer to Figure 18, page 32

6. Disconnect the burner tube from the orifice assembly.

7. Remove the orifice assembly from the burner.

8. Remove the burner retaining screw.

9. Remove the burner from the burner box frame.

10. Clean the burner .

NOTE

The burner slots may be cleaned with a small flat file. The inner bore of the burner body may be cleaned with a 3/16 in., double-spiral wire brush. Do not damage the threads when cleaning the inner bore of the burner.

11. Visually inspect the orifice. If dirty , wash the assembly with alcohol then allow to air dry. Replace the orifice assembly if the cleaning fails to remove dirt or if the condition of the orifice assembly is questionable.

12. Clean any accumulation of dirt or debris from the burner box base.

13. Reinstall the burner. Do not over tighten the burner's retaining screw.

CAUTION:

To avoid gas leaks and prevent damage to connections, piping, and components, always use two wrenches to tighten the burner tube. A damaged burner tube creates a potential for gas leaks.

14. Install the orifice assembly. First thread the orifice assembly into the burner finger tight, then finish tightening using two wrenches.

15. Connect the burner tube. First thread the fitting finger tight, then finish tightening using two wrenches.

16. Install the burner box cover. Do not overtighten the cover retaining screw.

17. Open the LP gas tank valve.

18. Open the solenoid gas valve manual shut-off.

19. Turn ON the refrigerator and select LP manual mode operation.

20. Leak test LP gas connections during the 30 second trial-for-ignition.

NOTE

Do not insert any type of cleaning tool or wire into the orifice. Do not drill or ream the orifice opening to clean it. Insertion of any type of cleaning tools, reaming, or drills through the opening will alter the volume of LP gas flow to the burner and create a fire hazard potential.

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WARNING:

Do not attempt to repair LP gas leaks with the refrigerator in operation. Before attempting to repair a gas leak:

n Turn OFF the refrigerator . n Close the LP gas valve and the solenoid gas valve

manual shut-off.

Figure 17. Drip Cup and Burner Box Cover.

Baffle

Burner

tube

Orifice adapter with LP16 orifice

Flue

Figure 18. Burner and Components.

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Caniste

Electrode

Burner

Refrigerator Service ManualN6XX/N8XX Models

ELECTRICAL REQUIREMENTS AND COMPONENTS

DC Voltage Requirements and Polarity

Operating controls require 10.5 to 15.4 Vdc to operate. The positive wire lead (+) connects to power board terminal 12VDC; the negative wire lead (–) connects to terminal GND1.

Power Board DC Fuse

WARNING:

Never replace a fuse with a higher amp rated fuse. Always use the specified fuse.

The controls circuit fuse is a standard 5 amp (tan color) automotive blade type fuse. It is located on the power board, terminal F1.

DC Power Wiring Requirements

WARNING:

Never use undersized wires to supply DC power to the power board. The use of undersized wires can cause low voltage and high amp draw conditions. The high amp draw caused by a circuit using undersized wires will cause the wire to overheat and creates an electrical fire hazard.

DC Heater–3-Way Refrigerators Only

WARNING:

Do not wire the heater(s) direct! Wiring heater(s) direct bypasses control safety devices and creates the potential for an electrical fire.

The DC heater, shown in Figure 19, is a cartridge type heater. The DC heater is rated for 225 W atts/16 amps, at a nominal 14 Vdc. Heater resistance should be

0.82 - 0.91 ohms.

NOTE

The AUTO DC and DC-Manual Mode operation maintain refrigeration only .

Stop Bead

2-Way Models

18 AWG is the minimum AWG size wire that can be used for connecting DC power to 2-way models. The size fuse for overload protection must not exceed 6 amps.

3-Way Models

The distance between the RV DC power source and the power board DC power connection terminals dictates the AWG size wire that must be used. If the distance from the DC power source is:

n 20 feet or less – 10 AWG or a larger gauge wire

must be used. The size fuse for circuit overload protection must not exceed 30 amps.

n Over 20 feet – AWG 8 or a larger wire gauge must

be used. The size fuse for circuit overload protection must not exceed 40 amps.

AC/DC Converter as Power Source

The power board must be supplied 12 Vdc only from the filtered output (battery side) of a converter.

Unfiltered voltage (commonly referred to as AC ripple) output of AC/DC converters can cause the electronic controls to set false fault codes. It can also turn off the refrigerator or prevent the refrigerator from turning off.

Y ellow Wire Leads

Figure 19. DC Heater

When AUTO DC or DC-Manual Mode does not maintain refrigeration and ventilation is correct:

n Measure DC voltage input to the power board. n Measure the heater's amp draw. n If amp draw is not as specified, measure the

heater's resistance at ambient temperature.

The DC heater must be inserted into the heater tube until the stop bead makes full contact with the tube's rim. See Figure 20, page 34.

DC Heater Circuit Fuse

WARNING:

Never replace a fuse with a higher amp rated fuse. Always use the specified fuse.

The DC heater circuit fuse is a standard 30 amp (green) automotive blade type fuse. It is located on the power board, terminal F2.

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AC Power Requirements

DC Heater AC Heater

AC Heater Tube DC Heater Tube

Canister Door

Figure 20. AC and DC Heaters (3-way refrigerator)

Lamp Assembly

The operation of the fresh food compartment 12 Vdc lamp is controlled by a magnet activated reed relay switch. The switch is in the optical control circuit board and the magnet is permanently mounted on the underside of the door's top trim piece.

Leaving the door ajar or open for more than two minutes causes the controls to display a "d" or "dr" fault code (depending on unit model). Closing the door turns off the light and clear the "d" or "dr" fault indicator from the display . However , the fault code will be stored in the diagnostic mode nonvolatile memory . For "d"/"dr" troubleshooting procedures. See page 19. As shown in Figure 21, the light assembly harness and thermistor share the same connector. Remove the light cover to access the connector.

WARNING:

Electric shock hazard! The refrigerator is fed power from more than one source. Unplug the AC cord from the RV AC receptacle before servicing electrical or electronic components.

AUTO AC and AC-Manual Mode operation requires 108 to 132 V ac. AC power must be supplied through a 2 pole/3 wire/20 amp grounding type receptacle.

AC Heater

WARNING:

Do not wire the heater(s) direct! Wiring heater(s) direct bypasses control safety devices and creates the potential for an electrical fire.

The AC heater, see Figure 22, is a cartridge type heater. Refrigerators with serial number lower than 854647 heater is rated for 300 Watts/2.7 amps @ 110 V ac and has a resistance of 41.25 ohms. Refrigerators with serial number 854647 and higher heater is rated for 300 Watts/2.5 amps @ 120 Vac. Heater resistance is 48 ohms.

Connector

Clip

Thermistor

Light bracket

Lightbulb

Light cover

N641/N841

Figure 21. Lamp/Thermistor Assembly .

Divider Heater

The divider heater is permanently "foamed" between the divider separating the freezer and fresh food compartment. The controls constantly monitor power board voltage output to the heater through built in diagnostics. Turning the refrigerator on automatically powers the heater.

Stop Bead

Black Wire Leads

Figure 22. AC Heater.

When poor or no cooling in AUTO AC or AC-Manual Mode, operation is present:

1. Measure AC voltage input to the power board.

2. Measure heater amp draw.

3. If amp draw is not as specified, measure the heater's resistance at ambient temperature.

When replacing an AC heater make sure the stop bead rests fully against heater tube rim. See Figure 22.

AC Heater Circuit Fuse

The AC circuit fuse is a fast acting 5 amp

" x 1

AGC type. It is on the power board, terminal F3.

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Refrigerator Service ManualN6XX/N8XX Models

AC Power Cord

The AC power cord shown in Figure 23(a) is used on units without ice maker . On all AC power cords the round side of the plug that connects to the power board faces the left side of the power board. The cord's grounding prong on the AC outlet connector must be left intact and never be modified or cut. The cord's ground wire (green wire) must always be fastened to the refrigerator cabinet metal plate.

Power Cord for Ice Maker Units

The AC power cord shown in Figure 23(b) is used on N64X IM and N84X IM units (IM = ice maker). The cord has two short wire leads originating at the rear of the power board connector plug to connect the ice maker wire harness black and white leads. The short ribbed wire is the line voltage lead, it has a female quickconnect type terminal. The smooth wire is the neutral lead, has a male quick-connect type terminal. Refer to pages 71 and 72 for ice maker wiring pictorials and diagrams.

All N643IM and N843IM units are equipped with an independent AC power cord (white in color) to supply 120 Vac to the ice maker only.

(b)

Smooth black lead

(a)

REFRIGERATORS WITH ICE MAKERS

Ground wire

REFRIGERATORS WITHOUT ICE MAKERS

to black ice maker wire

Ribbed black lead to white ice maker wire

Ground wire

Figure 23. AC Power Cord.

Fan mounting screws

12 Vdc V entilation Fan

The 12 Vdc ventilation fan, shown in Figure 24, enhances ventilation in sidewall venting installations (unit installed in RV slide out enclosures). The letter "F" in a model number is used to identify refrigerators with a factory installed 12 Vdc ventilation fan. All sidewall vented units must be equipped with a ventilation fan to prevent combustion gases and hot ventilation air from stagnating in the enclosure.

Ventilation fans are supplied 12 Vdc through power board connections. Fan operation is automatically controlled by a thermostatic switch mounted on the first condenser fin. See Figure 25. The switch turns the fan on when the temperature on the first condenser fin is approximately 130 °F. The switch turns the fan off when fin temperature falls to approximately 1 15 °F.

NORCOLD® fan kit is wired to the power board 12 Vdc

connections using "Y" type wire connector. The fan circuit is protected by an in-line fuse (included in the kit). The fuse, part of the fan kit wiring is a fast acting

1 amp, pictorial for field installed fan is shown in Figure 27, page 36.

/4” x 11/

” AGC type. See Figure 26. The wiring

Outer bracket and mounting screws

Figure 24. Fan Mounted on Top of Absorber Coil.

+ 12 Vdc input to thermostatic switch

Fan thermostatic switch

+12 Vdc wire to fan connection

Figure 25. Fan Thermostat.

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Red wire to thermal

switch

Red w

Fan thermostatic switch

Red

ire

Wire

THERMOSTAT

Red Wire

Black

Fan Wire

Red

Fan

1AMP FUSE

Red Spliced Wire

Wire

FAN

Black Spliced Wire

Black Wire

1 amp

in-line fuse

+ 12 Vdc connection

- 12 Vdc connection

Installed NORCOLD Fan Kit.

POWER BOARD

12 VDC

GND1

12 Vdc12 Vdc

Figure 27. NORCOLD Fan Kit Wiring Pictorial.Figure 26. Fan with Wiring Arrangement for Field

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Refrigerator Service ManualN6XX/N8XX Models

COOLING UNIT

Description

The cooling unit is a self-contained gravity flow absorption refrigeration system. The refrigerant charge is a solution of water, ammonia, sodium hydroxide, and sodium chromate (a corrosion inhibitor). Refrigeration is accomplished by applying heat energy and venting the heat extracted from the freezer and fresh food cabinet while maintaining the unit leveled.

Heat Absorption

The refrigerant transfers the heat from the freezer and the food cabinet to the absorber coils. At the absorber coils the metal surface absorbs the heat and air flow over the external surfaces of the coils and carries away the heat. A thermal air current created by the rising hot air flows out of the enclosure through the roof exhaust vent or sidewall exhaust vent (depending on installation). The flowing air mass passes over the surface of the condenser fins where it absorbs heat transferred from the ammonia vapors flowing through the condenser.

The thermal airflow process creates a "chimney effect". The "chimney effect" creates a continuous draft of cooling and combustion air. The fresh air drafted by the "chimney effect" though the intake vent removes rejected heat, support combustion, and expels the exhaust gases produced by the combustion process. Obstructions, restrictions, or modifications to vents or the enclosure will affect the heat absorption cycle. Poor cooling unit performance may be due to:

n Loose insulation interfering with the ventilation

process.

n Construction material or debris left in the

enclosure.

n Insect screen covering vents. n Plastic sheeting covering vents. n Items stored in the enclosure. n Modifications to vents or enclosure. n No roof or sidewall exhaust vent opening.

Information pertaining to ventilation and enclosure requirements appears on page 22.

Leveled Operation

The circulation of the refrigerant through the cooling unit is accomplished by gravity flow; therefore, the refrigerator must be operated leveled. Off-level operation affects the flow of the refrigerant through the cooling system. The maximum off-level operation limits are:

n 3 degrees from side-to-side. n 6 degrees from front-to-back.

Exceeding the maximum off-level limits can permanently damage the cooling unit.

The cooling unit or its performance are not affected when the vehicle is in motion

Gradual Decrease in Cooling Efficiency

A gradual decrease in cooling efficiency is not a clear indication of cooling system failure. Other factors that affect cooling efficiency include ventilation, the heat input, off-level operation, lack of service and maintenance, inadequate repairs, or unauthorized field modifications. If any of these factors exist and are not corrected, a replacement cooling unit will also perform inefficiently or fail.

Step-by-step troubleshooting is the best approach when dealing with a gradual decrease in cooling. It is important to consider is that, though not efficiently, the cooling unit is working. Troubleshooting should always begin by checking ventilation, then thoroughly checking the cooling unit, and heat sources. In the majority of reported case, the problem has been related to the installation, which in turn hindered cooling unit ventilation.

Additionally, ambient air temperature plays a significant role if the unit was not installed correctly. Incorrect installation lead to poor ventilation, which in turn relates to poor cooling performance.

The unit's service and maintenance history should be considered when checking a cooling unit for poor cooling performance. The service history and the scope of service work performed may lead directly to cause and resolution of a cooling problem.

The cooling unit has to reach normal operating temperatures before troubleshooting can take place. It takes an average of four hours for the refrigerant to reach normal operating temperatures. The time frame to reach operating temperatures depends on ambient air temperature.

Cooling System Monitoring

The controls monitor cooling system performance when a heat source is active. If the controls sense that

. the system is not cooling, it displays a fault code ("n"/ "no" "co") and locks out all heat energy sources.

First "No Cooling" Fault Occurrence

Users can reset the controls by turning the refrigerator off then back on. The user resetting option can only be accomplished when the controls record the first "no cooling" ("n"/"no" "co") fault occurrence. The completion of a full cooling cycle will remove the recorded first "n"/"no" "co" fault from memory and returns the controls to normal monitoring operation.

T wo Recorded "No Cooling" Fault Occurrences

If the controls detect two consecutive recorded "no cooling" faults , the "n"/"no" "co" fault code displays and the controls will lock out all heat sources (AC/LP/ DC). The power board can then only be reset by an authorized service center after troubleshooting and testing cooling system operation. See Page 21.

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Troubleshooting Cooling Faults

A high percentage of cooling units returned labeled “faulty” are fully operational units. The flowchart on page 38 provides information to troubleshoot cooling unit related faults.

Poor or No Cooling on AC Mode

WARNING:

Do not work on live circuits! Turn off and disconnect AC power and DC power supplies before attempting to remove, service, or repair any of the refrigerator's electrical or electronic circuits or components.

When troubleshooting poor or no cooling in AUT O AC or AC-Manual Mode, first check AC volt age input to the power board, then check voltage output to the heater , and the heater's amperage draw.

AC voltage problems, high or low volt ages, caused by the RV AC power supply circuit. To troubleshoot AC faults, refer to the diagnostic flow charts on pages 16, 17, and 18 of this manual.

Poor or No Cooling on LP Gas Mode

Poor or No Cooling on DC Mode – 3-Way Models

WARNING:

Do not work on live circuits! T urn off AC power and DC power before attempting to remove, service, or repair any of the refrigerator's electrical or electronic circuits or components.

When troubleshooting poor or no cooling in AUT O DC or DC-Manual Mode, always check DC voltage input to the power board, voltage output to the heater , and heater amperage draw. If DC volt age input to the refrigerator is lower than 12 Vdc, the problem is usually related to the DC power supply source. The RV DC power supply source may not be supplying the correct voltage to the power board.

The diagnostic flowcharts on pages 13, 14, and 15 of this manual provide information to troubleshoot DC power faults.

WARNING:

Do not operate the refrigerator if the cooling unit is leaking or leakage is suspected.

WARNING:

LP gas (propane) is highly flammable and explosive! Do not smoke, light fires, or create sparks

when working on the LP gas system.

Do not use an open flame to leak test any propane gas system component.

When troubleshooting poor or no cooling in AUT O LP mode or LP-Manual Mode, always check the burner flame appearance first. Most faults on LP gas operation related to a "dirty burner."

The diagnostic flowchart on page 12 of this manual provides information to troubleshoot the no flame faults.

Refrigerant Leakage

Y ellow powder or liquid deposits at the rear of the refrigerator or ammonia smell inside the refrigerator indicate refrigerant leakage. Exercise extreme care when handling a leaking or a suspected leaking cooling unit. The cooling system refrigerant solution consists of water , ammonia, sodium hydroxide, and sodium chromate.

Disposal of Cooling Unit

Dispose of cooling unit according to local, state, and federal guidelines and regulations. Dispose of any liquid waste or residue, according to pre-emergency planning and all applicable local, state, and federal regulations.

Do not, under any circumstances, release any waste or residue directly into sewers, or surface waters. If any liquid leaks or spills from the cooling unit, contact the nearest environmental services for guidance.

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Refrigerator Service ManualN6XX/N8XX Models

Cooling System Diagnostic Flowchart

Do not bypass or modify the refrigerator’s controls

or components to diagnose the cooling system. Do not wire the heater(s) direct. The heater is supplied power through a fused circuit.

Check cooling unit.

Replace cooling unit.

YES

Any signs of leak?

WARNING:

Do not operate the refrigerator if the cooling unit is leaking or a leak is suspected.

Signs of leak(s):

■

Yellow residue inside or at the rear of the

refrigerator.

■

Ammonia smell.

Correct ventilation to meet

installation requirements

Check (as required):

■

AC heater voltage and amp draw.

■

DC heater voltage and amp draw.

(3-way units only).

■

Burner, orifice, flue, deflector cap, flue baffle.

■

LP gas pressure.

Ventilation as

per installation

instructions?

Correct heat input device to meet specifications

Level refrigerator as outlined in Owner's Manual and specifications.

YES

Check heat input.

Heat input device

operating within

specification?

YES

Refrigerator

operating leveled?

Maximum off-level limits:

■

3 degrees side to side.

■

6 degrees front to back.

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YES

Continued on page 40.

WARNING:

Do not operate the refrigerator if the cooling unit is leaking or a leak is suspected.

From page 40.

Check condition of door gaskets.

Repair/replace door as required.

Replace cooling unit.

Door gaskets

sealing properly?

YES

Recheck cooling unit for leaks.

YES

Any signs of

leakage present?

Test test cooling unit performance.

Visual and audible signs of leak(s):

■

Yellow residue on the rear of the refrigerator.

■

Ammonia smell.

■

Gurgling noise (not always present.

Cooling unit performance test:

1. Disconnect thermistor from the wire harness.

2. Set temperature setting to the coldest setting.

3. Place thermometer in freezer.

4. Allow unit to operate for 3-4 hours.

5. Measure temperature.

Replace cooling unit.

Unit is operating normally.

Cooling detected?

YES

Refrigerator

temperatures

Check thermistor and

power board operation.

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YES

normal

The back of the freezer plate should be cool after 3-4 hours of continuous operation.

Temperatures given below are based on 90 °F ambient temperature, correct ventilation, and operation at coldest

setting for a period of 8-12 hours.

■

Freezer -5 °F to -10 °F.

■

Fin temperature 18 °F to 25 °F.

Refrigerator Service ManualN6XX/N8XX Models

Replacing the Cooling Unit

Condenser

Foam block

Absorber

Canister door

Leveling chamber

Freezer plate

Fin assembly

Cabinet

Heat deflector

Combustion seal

Canister

Burner box

Burner box window

Figure 28. Cooling Unit and Components.

NOTE

This procedure supplements the instructions packaged with N6XX/N8XX models replacement cooling units. Follow the procedure thoroughly to install the cooling unit correctly. Incorrect installation, adjustments, or modifications will affect cooling performance.

Removing the Refrigerator from the Enclosure

Refer to Figure 28 to locate components.

1. Close the LP gas tank valve(s).

2. Disconnect the AC power cord from the R V receptacle.

3. Turn OFF RV DC power to the refrigerator .

4. Disconnect the DC power supply wires from the power board.

DC heater (3-way units only)

AC heater

5. Disconnect the RV LP gas supply line from the gas valve.

N64XIM/N84XIM (ice maker)

a. Close the water supply valve to the ice maker. b. Disconnect the RV water supply line from the ice

maker water valve.

6. Remove two retaining screws from the bottom trim piece, then remove trim piece. See Figure 31, page

44.

7. Remove two retaining screws from the bottom of the cabinet. See Figure 31, page 44.

8. Remove two hole plugs from the top trim. See Figure 32, page 44.

9. Remove two top cabinet retaining screws. See Figure 32, page 44.

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Removal of Cooling Unit

N64XIM/N84XIM (ice maker)

a. Remove the ice maker water line. b. Disconnect the ice maker wire harness wires

(white and brown wires) from the water valve solenoid.

c. Disconnect the ice maker wire harness ground

wire. d. Move the wire harness out of the way. e Remove the water valve.

N62XF/N82XF/N64XF/N84XF (fan models)

• Remove the fan, bracket, thermostat, and wiring

from the cooling unit.

1. Remove the drip cup retaining screw, then remove the cup.

2. Remove the burner box cover retaining screw, then remove the cover.

3. Disconnect the burner tube from the gas valve at the gas valve.

4. Remove the burner retaining screw.

5. Remove the burner tube and burner from the burner box.

6. Disconnect the gas valve wires from the power board.

7. Remove the gas valve assembly (including bracket).

8. Loosen the spark/sense electrode assembly retaining screw and remove the assembly from the burner box.

10. Remove the rear mounting flange screws.

1 1. Pull the refrigerator from the enclosure.

12. Remove the burner box retaining screws, then remove the burner box.

3-way refrigerators (AC/LP/DC)

• Disconnect the DC heater wire leads from power board terminals FLP/DC HEAT and DC_HT GND.

13. Disconnect the AC power cord from the power board.

14. Remove the power board cover retaining screws, then remove the cover.

15. Disconnect the AC heater wires from power board terminals AC_HT -LO1 and AC_HT_HI.

16. Remove the thermistor from the 10th fin.

17. Remove eight retaining screws along with washers from the freezer plate.

15. Remove four retaining screws from the fin assembly.

16. Cut or remove the tape around the edge of the foam plug.

17. Remove two absorber bracket retaining screws.

18. Separate the cooling unit from the refrigerator cabinet. T o separate:

a. Grab the cooling unit by the liquid heat exchanger. b. Pull cooling unit upward at a slight angle to

unseat the foam plug.

19. Remove the condenser retaining screw. See Figure 29, page 43.

20. Pull the cooling unit from the cabinet.

Installation of Replacement Cooling Unit

NOTE

The sealant must be applied correctly to prevent air from being drawn into the cooling unit's high and low evaporators.

1. Clean the old sealant from the back of the evaporator plate, fin assembly , cooling unit, and the cabinet step.

2. Apply a 1/2 inch bead of sealant to the cooling unit low and the high temperature evaporators, and to the foam plug step. See Figure 30.

3. Mate the cooling unit foam plug section with the cabinet step opening. The foam plug must seat evenly against the cabinet step.

4. Fasten the condenser section to the cabinet. Do not overtighten the condenser retaining screw Figure 29, page 43.

5. Fasten the freezer plate to the cooling unit (eight screws with washers). Do not overtighten the

freezer plate screws.

6. Fasten the fin assembly to the cooling unit (four screws). Do not overtighten fin screws.

7. Attach the thermistor to the 10th fin (counting from right to left).

8. Fasten the absorber section of the cooling unit to the cabinet (two screws). Do not overtighten

retaining screws.

9. T ape the edge of the foam plug to the cabinet . Use HV AC metallic t ape or heavy duty duct tape.

3-way refrigerators (AC/LP/DC)

• Remove DC heater (3-way models only). Retain the heater for reinstallation.

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N62XF/N82XF/N64XF/N84XF (Fan models)

• Reinstall the fan bracket, fan, thermostat, and wiring. See wiring diagram on the outer surface of the fan bracket or refer to Figure 27, page 36.

Refrigerator Service ManualN6XX/N8XX Models

N64XIM/N84XIM (ice maker)

Foam plug step 1/2 in. bead of sealant

High temp evaporator 1/2 in. bead of sealant

Low temp evaporator 1/2 in. bead of sealant

a. Reinstall the ice maker water valve. b. Reconnect the ice maker water line. c. Connect the brown and the white wires to the

water valve solenoid terminals.

10. Install the burner box. 1 1. Install the burner tube and burner assembly . Do not

overtighten fittings.

13. Install the gas valve and connect the burner tube to the valve. Do not overtighten fittings.

14. Install the spark/sense electrode assembly. Set electrode-to-burner air gap 1/8 to 3/16 inch.

15. Install the burner box cover.

16. Connect the AC heater wires to power board terminals AC_HT -LO1 and AC _HT _HI.

3-way refrigerators (AC/LP/DC)

a. Install DC heater into tube. b. Connect heater wires to terminals FLP_DC

HEAT and DC_HT_GND.

Condenser retaining screw

/4 in.

Figure 29. Condenser Angle and Retaining Screw.

17. Reinstall the power board cover.

18. Connect the gas valve wires to the power board terminals GV and GV_GND.

19. Plug the AC cord into the power board.

20. Connect the spark/sense electrode assembly to the power board.

Figure 30. Application of Sealant.

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Reinstallation of Refrigerator into Enclosure

WARNING

Do not install the refrigerator if the combustion seal has been damaged. A damaged combustion seal must be replaced. The seal isolates the living area of the vehicle from exhaust gases generated by LP gas combustion. LP gas exhaust gases contain carbon monoxide, which is an odorless, colorless gas that can cause dizziness, nausea, or in extreme concentrations, death

Cabinet retaining screws

Trim retaining screws

Bottom trim piece

1. Check the condition of the combustion seal. Replace seal if damaged. Do not install the refrigerator if the combustion seal is damaged.

2. Place the refrigerator in the enclosure. The combustion seal must seat fully against the enclosure wall.

3. Attach the bottom of the cabinet to the enclosure. See Figure 31.

4. Reinstall the bottom trim piece. See Figure 31.

5. Secure the top of the cabinet with two screws and install hole plugs. See Figure 32.

6. Secure the back of the cabinet to the enclosure floor with two screws.

N64XIM/N84XIM (ice maker)

a. Connect the water supply line to the ice maker

water valve.

b. Open the water supply to the ice maker.

7. Connect the RV LP gas supply line to the gas valve inlet fitting.

8. Open the solenoid gas valve manual shut-off.

9. Plug the refrigerator AC power cord to the R V receptacle.

10. Connect the RV DC power supply wires to power board terminals 12VDC and 12V_GND1.

1 1. Open the LP gas tank valve(s), then leak test LP

gas connection at solenoid gas valve.

12. Leak test the burner solenoid gas valve and orifice assembly burner tube connections.

Figure 31. Bottom trim and retaining screws.

Cabinet retaining screws

Hole plugs

Figure 32. Top retaining screws and hole plugs.

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Refrigerator Service ManualN6XX/N8XX Models

Inputs, outputs, monitoring, and diagnostic functions are managed and controlled by the power board. Inputs, outputs, monitoring information, and diagnostic functions are communicated through the optical control assembly . The wire harness interfacing the power board with the optical control assembly is "foamed" into the cabinet. Wiring pictorials and schematics can be found on page 46, 47 and 48.

ELECTRONIC COMPONENTS

N61X/N81X Power board

Power Board

The power board is seated on an insulated base to prevent the printed circuit from making contact the refrigerator's cabinet metal plate. Power boards seated in bases are shown in Figure 33.

Two, self-tapping 1/4 inch hex head screws hold the power board and base in place. The power board cover is held by three self-tapping 1/4 inch hex head screws. The power board cover and external connections are shown in Figure 34.

Removal–Power Board

1. Turn OFF refrigerator.

2. Turn OFF RV DC power to the refrigerator .

3. Disconnect DC power supply wires from power board terminals 12 VDC and 12_VGND1.

3-way refrigerators (AC/LP/DC)

• Disconnect the DC heater wires from terminal FLP/DC HEAT and DC_HT GND.

4. Unplug the AC power cord from the RV AC receptacle.

5. Unplug the AC cord from the power board.

6. Disconnect the gas valve wires from power board terminals GV and GV_GND.

7. Disconnect the spark sense electrode wire.

5 A Fuse AC Power (F3)

N641/N841: 2-Way Power board

AC Heater Terminals

Wire Harness Connector (P1)

N62X/N82X Power board

AC Heater Terminals

Wire Harness Connector (P1)

5 A Fuse DC Power (F1)

N64XIM/N84XIM (ice maker)

• Loosen the water valve bracket, then move the bracket/water valve assembly out of the way.

8. Remove the three, 1/4 inch self-tapping hex head screws from the power board cover.

9. Remove the power board cover.

10. Disconnect the AC heater wires from power board terminals AC_HI and AC_LO.

1 1. Disconnect the wire harness connector from power

board, terminal P1.

12. Remove two, 1/4” hex head screws, then remove the power board along with its base.

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5 A Fuse AC Power (F3)

AC Heater Terminals

Wire Harness Connector (P1)

N641/N841: 3-Way Power board

5 A Fuse AC Power (F3)

AC Heater Terminals

Wire Harness Connector (P1)

DC Heater Terminals

Figure 33. N6XX/N8XX Power Boards

5 A Fuse DC Power (F1)

30 A Fuse DC Power (F1)

5 A Fuse DC Power (F1)

Installation–Power Board

1. Seat the power board in the base.

2. Attach the power board and base assembly to the refrigerator using two, 1/4 in. self-tapping hex head screws. Do not overtighten screws.

3. Connect the wire harness connector to the power board, terminal P1.

4. Connect the AC heater wires to terminals AC_HI and AC_LO.

5. Position and align the power board cover over the power board. Attach the cover using three, 1/4 in. self-tapping hex head screws. Do not

overtighten screws.

6. Connect the solenoid gas valve wires to terminal GV and GV_GND.

7. Connect the spark/sense electrode wire to the power board high tension terminal.

3-way refrigerators (AC/LP/DC)

• Connect the DC heater wires to power board terminals FLP/DC HEAT and DC_HT GND.

8. Connect the AC power cord to the power board and plug the AC power cord into the R V AC receptacle.

9. Connect positive and the negative DC power wire leads to the power board.

n Positive wire (+) to terminal 12VDC. n Negative wire (–) to terminal 12_VGND1.

Power Cord

DC Heater Wire Leads (3way units only)

AC Heater Wire Leads

+12 Vdc Wire Lead

Solenoid Gas Valve

Wire Leads

-12 Vdc Wire Lead

Spark/Sense

Electrode Assembly

Wire Lead

Figure 34. Power Board, 3-Way with Cover

N61X/N81X Optical Control Assembly

N64XIM/N84XIM (ice maker)

• Reinstall the water valve and bracket assembly.

10. Turn ON the RV DC power to the refrigerator.

1 1. Plug the AC power cord into the refrigerator

receptacle.

12. Turn ON refrigerator, then check all power board control functions before placing in service.

Optical Control Assembly

The optical control assembly is attached to the cabinet divider with two pan head Phillips screws. Optical control assembly removal and installation instructions, according to models, can be found in the following pages:

n Page 52, N611/N81 1 models. n Page 54, N62X/N82X models. n Page 57, N64X/N84X models.

N62X/N82X Optical Control Assembly

N64X/N84X Optical Control Assembly

Figure 35. N6XX/N8XX Optical Control Assemblies

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Refrigerator Service ManualN6XX/N8XX Models

120 VAC 120 VCA

5 Amp Fuse 5 Amp Fond

Display board Exposer le panneau

Divider heater

5 Amp Fuse 5 Amp Fond

AC HT LO1

AC HT HI1

GND

Spark electrode Declencher l’electrode

- 12 VDC / VCC + 12 VDC / VCC

Chauffant de diviseur

Temperature sensor / light assy. Detector de temperature / allume assy.

AC heater CA chauffage

N61X/N81X Wiring Pictorial.

Power board / Panneau de distribution

12V GND1

12VDC

3 11

AC HT HI1

AC HT LO1

12 14

-12 VDC / -12 VCC

RED/ROUGE

BLK/NOIR

RED/RGE

WHT/BLK/BLANC/NR RED/WHT/RGE/BLANC BLK/WHT/NR/BLANC

Temperature sensor / Thermosonde

WHT/RED/BLANC/RGE

Divider heater /

Chauffant de diviseur

BLK/NOIR

BLU/BLEU

GRN/VERT

WHT / VIO/BLANC/VIO

BLK/NOIR

}

Gas solenoid valve / Electrovanne a gaz

+12 VDC /+12 VCC

120 VAC 120 VCA

Gas valve Gazer la soupape

RED/ROUGE

BLK/NOIR

AC heater / CA chauffant

Light / Lampe

Temperature switch

RED/ ROUGE

Ventilateur

Fan / Ventilateur

Fan thermostat

RED/ ROUGE

Ventilateur thermostat

RED/ ROUGE

Fan thermostat / Ventilateur thermostat

Fan Models / Modeles Ventilateur

Display board / Panneau de affichage

Selector switch Selecteur d’alimentation

GAS

OFF

AUTO

Selecteur a la

temperature

Fan

BLK/

NOIR

Microprocessor

BLK/ NOIR

LED/DEL

N61X/N81X Wiring Schematic.

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Models / Modeles N64X, N64X.3, N84X, & N84X.3

Display board overlay / Exposer le panneau de planche Display board / Exposer le panneau Display board / Exposer le panneau

5 Amp Fuse

120 VAC 120 VCA

5 Amp Fond

AC HT LO1

AC HT HI1

30 Amp Fus3 30 Amp Fond

DC HT GND

DC HEATER

GND

Models / Modeles

N62X, N62X.3,

N82X, & N82X.3

3 Amp Fuse (.3 models) 3 Amp Fond (.3 modeles)

Spark electrode Declencher l’electrode

- 12 VDC / VCC + 12 VDC / VCC

Display board overlay / Exposer le panneau de planche

Divider heater / Chauffant de diviseur

Thermostat

Temperature sensor / light assy. Detector de temperature / allume assy.

Water line heater /

Arroser le chauffage de ligne

AC heater

CA chauffage

DC heater (.3 CC chauffage (.3 modeles)

models)

Gas valve / Gazer la soupape

Fan thermostat Ventilateur thermostat

Fan /

Ventilateur

N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Pictorial – Units with serial number

851759 and higher.

Power board / Panneau de distribution

12V GND1

DC HT GND

GV GND

DC HEATER

12VDC

3 11

13 10

12 14

AC HT HI1

AC HT LO1

-12 VDC / -12 VCC

YEL/JAUNE

RED/ROUGE

BLK/NOIR

RED/RGE

WHT/BLK/BLANC/NR RED/WHT/RGE/BLANC BLK/WHT/NR/BLANC

Temperature sensor / Thermosonde

WHT/RED/BLANC/RGE

BLK/NOIR

BLU/BLEU

GRN/VERT

WHT / VIO/BLANC/VIO

BLK/NOIR

+12 VDC /+12 VCC

Divider heater /

Chauffant de diviseur

120 VAC 120 VCA

}

solenoid valve /

Gas

Electrovanne a gaz

AC heater /

CA chauffant

DC heater / CC chauffant

RED/ROUGE

BLK/NOIR

Light / Lampe

Voltage regulator /

Regulateur de tension

RED/ ROUGE

Fan thermostat / Ventilateur thermostat

RED/ROUGE

RED/ ROUGE

BLK/

NOIR

Fan / Ventilateur

Fan Models / Modeles Ventilateur

IM Models / Modeles IM

WHT/ BLANC

LEDs / DELs

Alarm / Alarme

Heater /

Chauffant

Display board / Panneau de affichage

RED/ROUGE

Thermostat

BRN/ BRUN

ON-OFF / MODE / TEMP SET Switches ON-ARRETT / MODE / REGULATEUR TEMP. Commutateur

BRN/ BRUN

Microprocessor / Microprocesseur

Door switch / Porte commutateur

621829

BLK/

NOIR

WHT/

BLANC

BLK/NOIR

N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Schematic – Units with serial number

851759 and higher.

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Refrigerator Service ManualN6XX/N8XX Models

GND

COM

AC HT HI1

AC HT LO1

DC HT GND

DC HEATER

N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Pictorial – Units with serial number lower

than 851759.

N62X/N82X Display overlay

N64X/N84X Display overlay

12 Vdc connections

Gas valve

N62X/N82X Display circuit board

N64X/N84X Display circuit board

Divider heater

Lamp/Thermistor

AC power cord

Fuse, 5 amp/AGC type

Fuse, 5 amp/standard auto type

Spark/sense electrode wire assembly

AC heater

Fuse, 30 amp/auto blade type, 3-way models

DC heater, 3 way models only

Fuse, 3 amp for water line heater

Relay, water line heater

Water line heater

Thermostat, water line heater

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BLANC

BRN/ BRUN

BRN / BRUN

IM Models / Modeles IM

WHT/ BLANC

}

12V GND1

DC HT GND

GV GND

DC HEATER

12VDC

AC HT HI1

AC HT LO1

YEL/JAUNE

3 11

WHT/BLK/BLANC/NR

RED/WHT/RGE/

BLK/WHT/NR/BLANC

WHT/RED/BLANC/RGE

BLK/NOIR

BLU/BLEU

GRN/VERT

WHT / VIO/BLANC/VIO

RED/ROUGE

BLK/NOIR

RED/RGE

BLK/NOIR

N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Schematic – Units with serial number

lower than 851759

Power board

–12 Vdc connection

Gas valve

+12 Vdc connection

Thermistor

Light, fresh food compartment

Divider heater

On/OFF switch

Voltage regulator

Mode switch

TEMP SET switch

Door switch

Microprocessor

Alarm, N64X/N84X units only

7-segment LED N64X/N84X units

LED

120 Vac connection

AC heater

DC heater, 3 way units only

Heater, ice maker water line

Thermostat, ice maker water line

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Refrigerator Service ManualN6XX/N8XX Models

CONTROLS

ON LED

Green LED, indicates the refrigerator is ON. AUTO operation, indicates AC power operation. Flashes fault codes set by the controls.

GAS LED

Amber LED, indicates LP gas operation.

Fl

ashes fault codes set by the controls.

Figure 36. N61X/N81X Optical Control Assembly .

N61X/N81X Optical Control Assembly

The optical control assembly communicates with the power board through a "foamed in" wire harness. Drilling or puncturing the refrigerator rear panels may cause damage to the wire harness. Controls and related features are shown in Figure 36. The optical control assembly with front box attached is shown in Figure 37. The optical control assembly connected to the wire harness is shown in Figure 38.

Mode Selector Switch

3-Position Sli

de Switch:

Slide left to select AUTO operation. Slide right to select GAS operation.

Temperature Setting Selector Switch

5-Position Slide Switch:

Slide right to select a colder setting. Setting range: 1=cold/9= coldest.

3. Reinstall the front box. Do not overtighten the retaining screw.

4. Turn on the refrigerator , then check all of the optical control assembly functions.

Front Box

Two t abs lock the front box to the optical control assembly . A ret aining screw on the hinge side ret ains the front box to the divider. Shifting the refrigerator door swing requires shifting the front box to the selected hinge side.

Removal and Installation of Optical Control Assembly .

T o remove the optical control assembly:

1. Turn off the refrigerator .

2. Remove the front box retaining screw, then remove the front box.

3. Remove the optical control assembly retaining screws.

4. Disconnect the optical control assembly from the wire harness.

To install the optical control assembly:

1. Connect the optical control assembly to the wire harness.

2. Install the optical control assembly on the divider . Do not overtighten the retaining screws.

Figure 37. N61X/81X Optical Control Assembly With

Front Box.

Figure 38. Wire Harness Connection.

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Modes of Operation

AUTO Mode

In AUT O mode, the controls automatically search for A C power first. If AC power is present, the controls automatically select AC operation. The selection of AC power is indicated by the ON LED.

No AC Power

If AC power is not present or is interrupted, the controls automatically switch to LP gas operation. When the controls switch to LP gas operation, the GAS LED illuminates and a 30 second trial for ignition period starts. Both ON LED and GAS LED will remain illuminated. The ON LED indicates the refrigerator is turned ON. The GAS LED indicates the controls selected LP gas because AC power is not available.

AC Power Restored

If AC power is restored the controls automatically revert operation to AUT O AC and the GAS LED turns off. The ON LED will remain illuminated to indicate AUT O AC operation.

No AC and No Flame

If AC power is not present and a flame is not sensed after the controls switch to LP gas, the flame sensing circuit places the controls in "gas lock-out." In turn, the controls command the ON LED and GAS LED to flash at one second intervals.

The "A"/"no AC" flowchart on page 16 provides information to troubleshoot no AC power faults.

The "F"/"no FL" flowchart on page 12 provides information to troubleshoot no flame faults.

GAS Mode

In GAS mode, the controls will only select LP gas for operation. GAS mode operation is monitored by the flame sensing circuit. Normal GAS mode operation is indicated by the GAS LED.

Backup Operating System

The Backup Operating System (BOS) allows cooling to continue if the thermistor should fail. BOS is a duty cycle operation. The duration of the cooling cycle can be regulated by adjusting the temperature setting. The higher the temperature setting number, the longer the cooling cycle operates.

When the controls switch operation to BOS, the ON LED flashes once every three seconds. The flowchart on page 20 provides thermistor troubleshooting information.

“Gas Lock-Out”

"Gas lock-out" prevents the controls from automatically attempting to reignite the burner after the controls have detected an ignition failure. "Gas lockout" may be caused by any or a combination of the following:

n No LP gas available (empty LP gas tank). n Incorrect LP gas pressure (LP gas pressure must

be 10.5 to 1 1.5 inches water column).

n Dirty burner. n Clogged, damaged, or the wrong orifice. n Incorrect electrode-to-burner air gap. n A damaged or grounded spark/sense electrode

assembly. n Damaged or inoperable gas valve. To manually clear “Gas Lock-Out”:

n Turn OFF the refrigerator. n Correct the no flame fault. n Select AUTO or GAS operation.

No Flame

In GAS mode, if a flame does not ignite during the 30 second trial for ignition, or the flame goes out, the flame sensing circuit shuts off power to the gas valve and places the controls in "gas lock-out." In turn, the controls command the GAS LED to flash at one second intervals.

The "F"/"no FL" flowchart on page 12 provides information to troubleshoot no flame faults.

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Refrigerator Service ManualN6XX/N8XX Models

TEMP SET Switch

Press momentarily to view temperature setting Press and hold to select desired temperature

setting.

Settings: 1= cold/9= coldest.

Power Switch

Press momentarily to turn ON refrigerator. Press and release after three seconds to turn

OFF refrigerator.

AUTO

1-COLD

7-Segmet LED Display Shows:

Normal operation on AUTO and LP GAS. Fault codes set by the control system. Temperature setting. Diagnostic information.

Figure 39. N62X/N82X Optical Control Assembly .

N62X/N82X Optical Control Assembly

The optical control assembly communicates with the power board through a "foamed in" wire harness. Drilling or puncturing the refrigerator rear panels may cause damage to the wire harness. Controls and related features are shown in Figure 39. The optical control assembly with front box attached is shown in Figure 40. The optical control assembly connected to the wire harness is shown in Figure 41.

LP GAS

COLDEST-9

TEMP

SET

MODE

OFF

MODE Switch

Press momentarily to display operating

mode.

Press and hold fo select AUTO, AC-Manual,

or LP Manual mode. Release when desired mode displays.

3. Reinstall the front box. Do not overtighten the retaining screw.

4. Turn on the refrigerator , then check all of the optical control assembly functions.

Front Box

Removal and Installation of Optical Control Assembly

T o remove the optical control assembly:

1. Turn OFF the refrigerator .

2. Remove the front box retaining screw, then remove the front box.

3. Remove the optical control assembly retaining screws.

4. Disconnect the optical control assembly from the wire harness.

To install the optical control assembly:

1. Connect the optical control assembly to the wire harness.

2. Install the optical control assembly on the divider . Do not overtighten the retaining screw .

Figure 40. N611/81 1 Optical Control Assembly With

Front Box.

Figure 41. Wire Harness Connection.

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Modes of Operation

All N62X and N82X are designed for 2-way operation.

AUTO Mode

In AUT O mode, AC power is the first heat energy source selected by the controls. If AC power is not present, the controls shift to LP gas (propane), the controls second priority heat energy source.

AUTO AC Operation

When AUTO mode is selected:

1. Mode of operation is indicated by the AUTO LED.

2. The AC LED comes on as the controls search for AC power

AUTO

LP GASAC

availability.

3. The AC LED turns of f when AC power is selected by the controls. Mode operation is indicated by the

AUTO

LP GASAC

AUTO LED. See NOTE 1.

NOTE 1

In AUTO mode, pressing the MODE switchbutton momentarily displays the heat energy source in use. For example, in AUT O AC, the AC LED will come on and stay on for approximately 10 seconds.

AUTO LP Gas Operation

In AUT O mode, the controls shif t to LP gas when AC power is not available or interrupted. The shift to AUTO LP is as follows:

No AC Power and No Flame

When AC power is not present and a flame is not sensed, the controls:

1. Aknowledge both faults after the 30 seconds trialfor ignition is over.

2. Shut power to the solenoid gas valve.

3. Set "gas lock-out". See NOTE 2.

4. Provide a visual warning by flashing alternating A (no AC) and F (no flame) fault codes, shown below . See NOTE 3.

AUTO

LP GAS

Alternating "A" and "F" Codes

AUTO

LP GAS

5. Record and store the no AC and no flame fault s in diagnostics nonvolatile memory fault history .

NOTE 2

In AUTO mode, the controls maintain "gas lock-out" until a full cooling cycle on AUTO AC is completed. Turning the refrigerator OFF and back ON also clears "gas lock-out".

NOTE 3

1. The AUT O LED indicates the unit is on and operating in AUT O mode.

AUTO

2. The AC LED comes on as the controls verify AC power availability .

AUTO

3. Since AC power is not present, the controls shift to LP gas. The LP LED comes on to signal the start of a 30

AUTO

seconds trial-for ignition.

4. The controls sense the flame, turn off the LP GAS LED leave the AUTO LED on to indicate AUTO mode operation.

AUTO

Shift from AUTO LP GAS to AUTO AC

In AUT O mode, the controls shift automatically from AUTO LP GAS back to AUT O AC when the controls detect that AC power has become available.

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LP GASAC

N62X/N82X models with serial number 854467 and lower equipped with the original power board (p/n

619353) and optical control assembly (p/n 619350) will only display fault indicator A.

LP GASAC

Troubleshooting a "F"/"no" "FL" and "A"/"no" "AC"

LP GASAC

Faults

Use the following references to identify , troubleshoot, and correct an ignition failure and/or no AC fault s.

n Page 12, "F"/"no" "FL" fault codes troubleshooting

LP GASAC

flowchart.

n Page 16, "A"/"no" "AC" fault codes troubleshooting

flowchart.

n Page 62, Diagnostic Mode–N62X/N82X Models,

Screen 4.

Refrigerator Service ManualN6XX/N8XX Models

AC-Manual Mode

When the AC-Manual Mode is selected, AC power is the only heat energy source selected by the controls. When the AC-Manual Mode is selected:

LP Gas–Manual Mode

When LP GAS-Manual Mode is selected, LP gas (propane) is the only heat energy source selected by the controls. When the LP GAS-Manual Mode is selected:

1. Mode of operation selected is indicated by the AC LED.

AUTO

LP GASAC

2. The AC LED st ays on as long as the AC–Manual Mode is selected.

No AC Power or Loss of AC Power

When no AC power or AC power is lost, the controls:

1. Provide a visual warning by flashing the A (no AC) fault code.

AUTO

LP GASAC

2. Record and store the no AC fault in diagnostics nonvolatile memory fault history .

Troubleshooting a "A"/"no" "AC" Fault

Use the following references to identify , troubleshoot, and correct a no AC fault.

n Page 16, "A"/"no" "AC" fault codes troubleshooting

flowchart.

n Page 62, Diagnostic Mode–N62X/N82X Model,

Screen 4.

AC Power Restored

When AC power is restored to the power board, the controls:

1. Automatically restore AC–Manual Mode operation.

2. Clear the "A" fault code from the screen. However, the recorded fault history will not be erased from memory .

1. Mode of operation is indicated by the LP LED.

AUTO

LP GASAC

2. The LP GAS LED stays on as the LP GAS– Manual Mode is selected.

Flame Fails to Ignite or Flame Goes Out

If a flame does not ignite or the flame goes out, the controls:

1. Set "gas lock-out" and shut off power to the solenoid gas valve.

2. Provide a visual warning by flashing the F (no flame) fault code.

AUTO

LP GASAC

3. Record and store the no flame fault in diagnostics nonvolatile memory fault history .

Clearing "Gas Lock-Out"

"Gas lock-out" can be cleared by turning the refrigerator OFF and back ON.

Troubleshooting a "F"/"no" "FL" Fault

Use the following references to identify , troubleshoot, and correct an ignition failure fault.

n Page 16, "F"/"no" "FL" fault codes troubleshooting

flowchart.

n Page 62, Diagnostic Mode–N62X/N82X Mode,

Screen 4.

3. Display the AC LED.

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TEMP SET Switch

Press momentarily to view temperature setting. Press and hold to select a temperature setting. Settings: 1= cold/9= coldest.

Power Switch

Press momentarily to turn ON refrigerator. Press and release after three seconds to

turn OFF refrigerator.

1-COLD COLDEST-9

MODE

TEMP

SET

ON-OFF

Two, 7-Segmet LED Display Show:

Operation mode AUTO, AC, LP and DC (3-way models only).

Fault codes and diagnostic information. Temperature setting.

Figure 42. N64X/N84X Optical Control Assembly .

N64X/N84X Optical Control Assembly

The optical control assembly communicates with the power board through a "foamed in" wire harness. Drilling or puncturing the refrigerator rear panels may cause damage to the wire harness. Controls and related features are shown in Figure 42. The optical control assembly with front box attached is shown in Figure 43. The optical control assembly connected to the wire harness is shown in Figure 44.

Front Box

MODE Switch

Press momentarily to display operating mode. Press and hold to select AUTO, AC or LP Manual

Mode, or DC Manual Mode (3-way models only). Release when desired mode displays.

3. Reinstall the front box. Do not overtighten the retaining screw.

4. Turn on the refrigerator , then check all of the optical control assembly functions.

Removal and Installation of Optical Control Assembly

To remove the optical control assembly:

1. Turn off the refrigerator .

2. Remove the front box retaining screw, then remove the front box.

3. Remove the optical control assembly retaining screws.

4. Disconnect the optical control assembly from the wire harness.

To install the optical control assembly.

1. Connect the optical control assembly to the wire harness.

2. Install the optical control assembly on the divider . Do not overtighten the retaining screw .

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Figure 43. N64X/84X Optical Control Assembly With

Front Box.

Figure 44. Wire Harness Connection.

Refrigerator Service ManualN6XX/N8XX Models

Modes of Operation

AUTO

In AUT O mode, AC power is the first heat energy source selected by the controls. If AC power is not present, the controls shift to LP gas (propane), the second priority heat energy source.

AUTO – N64X.3/N84X.3 (3-way units)

In 3-way units, if LP gas if a flame is not sensed, then flame goes out, or an ignition failure occurs, the controls shift to DC power , the third priority heat energy source. For additional information on 3-way units AUT O mode, see page 58.

AUTO AC Operation

When the A UTO mode is selected, the controls:

Shift from AUTO LP GAS to AUTO AC

In AUTO mode, the controls shif t automatically from AUTO LP GAS to AUTO AC any time the controls sense that AC power is available.

No AC Power and No Flame

When AC power is not present and a flame is not sensed, at the end of the 30 seconds trial-for ignition, the controls:

1. Shut off power to the solenoid gas valve.

2. Set "gas lock-out". See NOTE 2.

3. Sound the alarm (an intermittent beeping tone).

1. Display AUTO ("AU") mode operation indicator.

2. Flashes "AU" and "AC" as the search for AC power begins.

o n

3. Turn of f "AU" and "AC" when AC power is selected and displays the ON LED. See NOTE 1.

NOTE 1

In AUTO mode, pressing the MODE switchbutton momentarily displays the heat energy source in use. For example, in AUT O AC, the display alternate flashing

AU and AC for approximately 10 seconds.

AUTO LP Operation

The controls shift to AUT O LP mode any time AC power is not available. The controls shift to AUTO LP as follows:

4. Provide a visual warning by flashing alternating "no" "AC" and "no" "FL" (no flame) fault codes shown below).

5. Record and store the "no" "AC" and "no" "FL" faults in diagnostics nonvolatile memory fault history.

NOTE 2

AUTO LP mode remains in "gas lock-out" until a full cooling cycle on AUTO AC is completed. "Gas lockout" can also be cleared by turning the refrigerator OFF then back ON.

Shift from AUTO LP GAS to AUTO AC

In AUTO mode, the controls shif t automatically from AUTO LP GAS back to AUTO AC when the controls detect that AC power has become available.

1. The AUT O mode operation indicator ("AU") displays.

2. "AU" and "AC" indicator alternate flashing on the display while the controls search for AC power.

3. When AC power is not present, the controls shift to AUTO LP mode. "AU" and "LP" alternate flashing on the display as the controls start a 30 seconds trial-for ignition.

4. The controls sense the flame, turn off the "AU" and "LP", and display the ON LED. See NOTE 1.

Troubleshooting No Flame and No AC Faults

Use the following references to identify , troubleshoot,

o n

and correct an ignition failure and/or no AC faults. n Page 12, "F"/"no" "FL" fault codes

troubleshooting flowchart.

n Page 16, "A"/"no" "AC" fault codes

troubleshooting flowchart.

o n

www.norcold.com/cda 57N6XX/N8XX ModelsRefrigerator Service Manual

n Page 62, Diagnostic Mode–N62X/N82X Models,

Screen 4.

AUTO DC Operation – 3-Way Units Only

In AUTO DC mode, the controls shif t to DC power when AC power is not present and flame is not sensed. The shift to AUTO DC operation does not show on the display . The shift is invisibly performed by the controls. When the controls shift to AU T O DC:

1. The AUTO (" AU") mode operation indicator displays.

2. "AU" and "AC" indicators alternate flashing on the display as the controls search for AC power.

o n

AC-Manual Mode

In the AC-Manual Mode, AC power is the only heat energy source selected by the controls. When the controls shift to AC-Manual Mode:

1. The AC mode indicator ("AC")displays as the controls start the search for AC power.

2. When AC power is selected, the AC indicator turns off. The ON LED displays. See NOTE 3.

NOTE 3

3. When AC power is not present the controls shift to AUT O LP mode. "AU" and "LP" indicators alternate flashing on the display as the controls start a 30 seconds trial-for

o n

ignition.

4 Not sensing a flame causes the controls to shift to

Auto DC power. The shift to DC power is not displayed. See NOTE 1.

5. The ON LED displays. See NOTE 2.

NOTE 1

Pressing the MODE switchbutton will displays the "AU" and "dc" indicators.

NOTE 2

The auto sequence described in steps 1 through 5 is repeated after the completion of each cooling cycle to enable the controls to select a higher priority heat energy source if available.

The control's priorities for selecting a heat energy source are:

n First priority: AC power. n Second priority: LP gas. n Third priority: DC power – 3-way units only.

Pressing the MODE switchbutton displays the "AC" mode indicator.

No AC Power or Loss of AC Power

If the controls do not sense the presence of AC power or when AC power is lost, the controls:

1. Display the "no" "AC" fault code.

2. Sound the audible alarm. The alarm is an intermittent beeping tone. Pressing the mode switchbutton silences the alarm.

3. Record and store the "no" "AC" fault in diagnostics nonvolatile memory fault history .

AC Power Restored

When AC power is restored, the controls:

1. Automatically restore AC-Manual Mode operation; however, the recorded fault history will not be erased from memory .

2. Silence the alarm and clear then "no" "AC" fault code from the display .

Troubleshooting "no" "AC" Fault

Use the following references to identify , troubleshoot, and correct a no AC fault.

n Page 16, "A"/"no" "AC" fault codes

troubleshooting flowchart.

n Page 62, Diagnostic Mode – N62X/N82X Model,

Screen 4.

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Refrigerator Service ManualN6XX/N8XX Models

LP-Manual Mode

In the LP-Manual Mode, LP gas is the only heat energy source selected by the controls. When the controls shift to LP-Manual mode:

DC-Manual Mode

The DC-Manual Mode is the only heat energy source aknowledged and selected by the controls. When the controls shift to DC-Manual mode:

1. The LP mode indicator ("LP") displays and the controls start a 30 seconds trial-for-ignition.

2. The LP mode indicator turns off when the controls sense a flame. The ON LED displays. See NOTE below.

NOTE 4

Pressing the MODE switchbutton displays the "LP" mode indicator.

Flame Fails to Ignite or Flame Goes Out

If the controls do not sense a flame within the 30 seconds trial-for-ignition, the controls:

1. Shut-off power to the solenoid gas valve.

2. Set "gas lock-out." See NOTE 5 below.

3. Display a flashing visual warning, "no" "FL" (shown below).

4. Sound an audible alarm. The alarm is an intermittent beeping tone. Pressing the mode switchbutton silences the alarm.

1. DC mode indicator ("dc") displays as the controls start the seach for DC power.

2. The dc mode indicator turns off when the controls shift to DC power. The ON LED displays. See NOTE below.

NOTE 6

Pressing the MODE switchbutton displays the "dc" mode indicator.

No DC Power to DC Heater Circuit

If the controls do not sense that DC power is available to the DC heater circuit, the controls:

1. Display the "dc" "HE" fault code.

o n

2. Sound the audible alarm. The alarm is an intermittent beeping tone. Pressing the mode switchbutton silences the alarm.

NOTE 5

AUTO LP mode remains in "gas lock-out" until a full cooling cycle on AUTO AC is completed. "Gas lockout" can also be cleared by turning the refrigerator OFF then back ON.

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DIAGNOSTIC MODE — MODELS N62X/N82X

Display

LP GAS

AUTO

1-COLD

Figure 45. N62X0/N82X Optical Control Assembly .

Diagnostic Mode

The Diagnostic Mode uses nine diagnostic channels, commonly known as "screens", to display "live" inputs, outputs, and fault history. Each screen is identified by a number, which shows in the optical control assembly display . See Figure 45.

COLDEST-9

Accessing the Diagnostic Mode

To access the Diagnostic Mode:

TEMP

SET

MODE

1. Press and hold both the buttons at the same time.

OFF

MODE

and

TEMP

SET

The N62X/N82X optical control display uses a single 7segment LED module to display diagnostic information. Information made up of two letter or numbers display in an alternating sequence. Fault history information, "live" inputs, and outputs, are presented using lighted LED segments. The diagnostic LED segments, if present, displays after the screen number turns off. Diagnostic LED segments identification numbers. See Figure 46.

2 3

5 6

Figure 46. Diagnostic LEDs Segments Identification.

2. Release the

MODE

and

TEMP

as soon as

SET

screen displays.

3. A few seconds later, displays.

Changing Screens To change screens, Press

MODE

the button until the

next screen displays.

Exiting the Diagnostic Mode

To exit the Diagnostic Mode:

1. Press and hold the

MODE

and

TEMP

buttons at

SET

the same time.

2. Release the

MODE

and

TEMP

buttons as soon as

SET

the LED segment that represents the selected operation mode appears on the display (AUTO, AC, or LP GAS).

Turning the refrigerator OFF then back ON also exits the Diagnostic Mode

Errata Sheet, 01/16/04

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Refrigerator Service ManualN6XX/N8XX Models

Screens and Diagnostic Segments Information

Screen Diagnostic Mode Active

Screen 1 confirms that the Diagnostic Mode is active. A few seconds after the number displays, all LED segments light. See illustration

If the LED segments do not match the illustration, the fault is in the optical control display .

Replacing the optical control assembly should resolve this fault.

Press the

MODE

button to bring up screen 2.

Screen LED Segments Reliability Check

Screen Thermistor Fin Temperature

Screen 3 shows the actual fin temperature being sensed by the thermistor. This is not the fresh food cabinet air temperature. The illustration shows 30°F fin temperature as displayed in screen 3.

Screen Number

Press the

2 Seconds

MODE

button to bring up screen 4.

1 Second

Blank Screen

(2 second pause)

= 30°F

Screen Stored Fault History

Screen 2 continues to confirm the reliability of the display. The screen should go completely blank after the screen number is displayed.

If an LED segment displays, the fault is in the optical control assembly.

Replacing the optical control assembly should resolve this fault.

Press the

MODE

button to bring up screen 3.

Screen 4 displays stored fault history using lighted LED segments. The illustration provides fault history information and assigned LED segments. If a fault occurred, its assigned LED will light.

Ignition fault

AC mode selected but not available

Press the

Door ajar

MODE

button to bring up screen 5.

5 6

AC heater failed open

DC voltage low

DC voltage high

AC relay stuck closed

Screen Stored Fault History

Screen 5 also displays stored fault history using lighted LED segments. The illustration provides fault history information and assigned LED segments. If a fault occurred, its assigned LED will light.

Thermistor failure.

Flame sense failure

AC voltage low AC voltage high

2 3

5 6

Press the

MODE

button to bring up screen 6.

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Screen Erase Fault History Data

Screen Power Board Outputs

Screen 6 provides a way to erase stored fault history from memory. To erase stored fault history:

1. Press and hold the

TEMP

button when and

SET

display.

2. Release the

TEMP

button when and

SET

display .

3. Wait five seconds.

4. Press and hold the

TEMP

button until and

SET

display again.

Press the

MODE

button to bring up screen 7.

Screen Power Board Inputs

Screen 8 display "live" power board outputs using lighted LED segments. The illustration below provides "live" outputs information and assigned LED segments.

If the power board output is active or "live," the assigned LED will light.

AC power to AC heater

DC power to divider heater

DC power to light switch

Press the

5 6

MODE

button to bring up screen 9.

DC power to gas valve DC power to ignition circuit

Screen Power Board DC Voltage Status

Screen 7 displays "live" power board inputs using lighted LED segments. The illustration below provides "live" inputs information and assigned LED segments. If a

power board input is active or "live", its assigned LED will light.

Food compartment light is off and door is closed

Sensing burner flame

Press the

MODE

button to bring up screen 8.

Thermistor sensing

fin temperature

Screen 9 display power board DC voltage status using lighted LED segments. The illustration below provides DC voltage status and assigned LED segments. If DC

voltage at the power board within normal range (10.5 to 15.4 Vdc), LED segment 4 will be on.

DC voltage higher than 15.4 volts

Press the

MODE

button to return to screen 1.

DC voltage normal

DC voltage lower than 10.5 volts

Errata Sheet, 01/16/04

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Refrigerator Service ManualN6XX/N8XX Models

DIAGNOSTIC MODE — MODELS N64X/N84X

Display

Figure 47. Models N64X/N84X Optical Control Assembly .

Diagnostic Mode

The Diagnostic Mode uses ten diagnostic channels, commonly known as "screens", to display "live" inputs, outputs, and fault history. Each screen is identified by a number, which shows in the optical control assembly display . See Figure 47.

The N64X/N84X optical control display uses a dual 7segment LED module to display the screen number and diagnostic information. Information made up of four letters or digits displays in an alternating sequence. Fault history , "live" inputs, and output s is presented using LED segments. The diagnostic LED segments, if present, display to the right of the screen number. Diagnostic LED segments identification numbers. See Figure 48.

1-COLD COLDEST-9

MODE

TEMP

SET

ON-OFF

Accessing the Diagnostic Mode

To access the Diagnostic Mode:

1. Press and hold both the

MODE

and

the same time.

2. Release the

MODE

and

as soon as screen

TEMP

SET

displays.

3. A few seconds later, displays.

Changing Screens

T o change screens, press and hold the until the next screen displays.

buttons at

TEMP

SET

button

MODE

2 3

5 6

ON Light

Figure 48. Diagnostic LEDs Segments Identification.

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Exiting the Diagnostic Mode

To exit the Diagnostic Mode:

1. Press and hold

MODE

and

buttons at the

TEMP

SET

same time.

2. Release the

MODE

and

buttons as soon as the

TEMP

SET

display shows .

Turning the refrigerator OFF then back ON also exits the Diagnostic Mode.

Screens and Diagnostic Segments Information

Screen Diagnostic Mode Active

Screen 1 confirms that the Diagnostic Mode is active. A few seconds after the screen number appears, all LED segments light. See illustration.

If the screen segments do not match the ones shown in the illustration, the fault is in the optical control assembly. Replacing the optical control should resolve the fault.

Press the

button to bring up screen 2.

MODE

Screen LED Segments Reliability Check

Screen 2 diagnostics continue to confirm the reliability of the display . Af ter a few seconds only the ON light displays. All other LED segment s should be off. See illustration.

Screen Stored Fault History

Screen 4 displays stored fault history using lighted LED segments. The illustration provides fault history information and assigned LED segments . If a fault occurred, its assigned fault history LED will be on.

Door ajar

Screen Number

AC mode selected but not available

Press the

button to bring up screen 5.

MODE

Ignition fault

AC heater failed open

DC voltage low

DC voltage high

AC relay stuck closed

* 3-way models

Screen Stored Fault History

Screen 5 also displays stored fault history using lighted LED segments. The illustration provides fault history information and assigned LED segments . If a fault occurred, its assigned fault history LED will be on.

ON Light

The ON light should be the only LED displayed. If any other LED displays, the fault is in the optical control assembly. Replacing the optical control should resolve the fault.

Press the

button to bring up screen 3.

MODE

Screen Thermistor Fin Temperature

Screen 3 displays the actual fin temperature being sensed by the thermistor. This is not the fresh food cabinet air temperature. The illustration shows 32°F fin temperature as displayed in screen 3.

= 32°F

Flame sense failure

Screen Number

AC voltage low

Press the

MODE

button to bring up screen 6.

5 6

Thermistor failure.

DC relay stuck closed*

DC heater failed open* AC voltage high

* 3-way models

Screen Erase Fault History

Screen 6 provides a way to erase fault history from memory. To erase fault history:

1. Press and hold the on the screen.

2. Release the

TEMP

SET

screen.

3. Wait five seconds.

button when shows

TEMP

SET

button when shows on the

Press the

button to bring up screen 4.

MODE

4. Press and hold the button until show on the screen.

Press the

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button to bring up screen 7.

MODE

Refrigerator Service ManualN6XX/N8XX Models

Screen Power Board Inputs

Screen Power Board DC Voltage Status

Screen 7 displays "live" power board inputs using lighted LED segments. The illustration below provides "live" inputs information and assigned LED segments. If a

power board input is active or "live," its assigned input LED will be on.

Food comparment light

Sensing burner flame

Screen Number

Press the

MODE

button to bring up screen 8.

is off and door is closed

Thermistor sensing

fin temperature

Screen Power Board Outputs

Screen 8 displays "live" power board outputs using lighted LED segments. The illustration below provides "live" outputs information and assigned LED segments.

If a power board output is active or "live," its assigned output LED will be on.

Screen 9 displays DC voltage status using lighted LED segments. The illustration below provides DC voltage status information and assigned LED segments. If DC

voltage at the power board within normal range (10.5 to 15.4 Vdc), LED segment 4 will be on.

DC voltage higher than 15.4 volts

Screen Number

Press the

button to bring up screen 0.

MODE

DC voltage normal

DC voltage lower than 10.5 volts

Screen Power Board AC Voltage Status

Screen 0 displays AC voltage status using lighted LED segments. The illustration below provides AC voltage status information and assigned LED segments. If AC

voltage at the power board within normal range (108 to 132 Vac), LED segment 4 will be on.

DC power to DC heater*

Screen Number

DC power to light switch

Press the

button to bring up screen 9.

MODE

AC power to AC heater

5 6

*3-way models

DC power to divider heater

DC power to gas valve DC power to ignition circuit

Screen Number

Press the

AC voltage higher than 132 volts

button to return to screen 1.

MODE

AC voltage normal

AC voltage lower than 108 volts

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ICE MAKER

The ice maker is a factory installed accessory. The components that support the ice maker are the water valve, water fill line, water fill tube, and the wire harness. The ice maker and components are shown in Figure 49.

Wire Harness

The wire harness, Figure 49(a) has four wires.

n Black–line (L) voltage with thermal fuse for ice

mold overheating protection. It has an insulated female quick-connect terminal.

n White–neutral (N). The insulated male quick-

connect terminal is the 120 V ac neutral (N) conductor .

n Brown–supplies 120 Vac power to the water valve

solenoid during the fill cycle. It connects to water valve solenoid M terminal.

n Green–ground. Connects to the metal cabinet

metal plate along with the 120 V ac power cord ground wire.

Fill T ube

The fill tube is foamed into the top of the cabinet. It is not a replaceable component.

Water V alve

Figure 49(b) shows an ice maker solenoid water valve that has a 12 Vdc water line heater. The 12 Vdc heater is controlled by a thermostatic switch mounted on the valve's mounting bracket.

Figure 49(c) shows an ice maker solenoid water valve without a 12 Vdc water line heater.

Specifications

Cycle ....................... One revolution (eject and water fill)

Water fill capacity ............................ 4.7 fl. oz. (140 mL)

Ice yield ............................3.5 lbs/24 hrs. (approximate)

Cycle duration...................................... 3.5 to 7 minutes

Voltage............................................................... 120Vac

Amp draw

Cycle on/heater on ...............................................1.6 A

Cycle on/heater off ...............................................0.3 A

Cycle off.................................................. No amp draw

Motor .......................................................1.5 W/8800 Ω

Mold Heater ................................................185 W/72 Ω

Shut-Off Arm

Ice Bin

(c)

Water Valve Assembly without water line heater

Ice Maker

Cover

Fill Tube

Black = L White = N Brown = V Green = Ground

(b)

120 Vac Terminals

Foil Type Water Line Heater

Water Valve Assembly

with water line heater

(a)

Thermal Fuse

Wire Harness

Heater Wire Lead

Connector

Errata Sheet, 01/16/04

Figure 49. Ice Maker.

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Refrigerator Service ManualN6XX/N8XX Models

Ice Maker Troubleshooting Chart

Problem Probable Cause Remedy

n No ice in mold/no ice

yield.

A. No AC power to ice maker B. No water available to ice

maker. C. Water valve strainer clogged. D. Water valve failure.

n Ice in mold/no ice yield. A. No AC power available.

B. Shut-off arm in the OFF

position. C. Mold over filled. D. Water valve washer seal

damaged.

n Mold dripping water/

overflowing.

A. Water fill adjustment screw

set incorrectly. B. Water valve washer seal

damaged.

n Ice maker will not cycle,

AC power available.

A. Mold heater failed open. B. Motor failure. C. Mold thermostat failure. D. Wire harness thermal fuse

open.

A. Check AC power supply. B. Check water supply to ice maker water. C. Clean water valve inlet strainer. D. Test water valve operation (see page 69).

A. Check AC power supply. B. Lower the shut-off arm to the ON

position. C. Check position of water valve orifice. D. Replace water valve.

A. Reset the water adjustment screw. B. Replace water valve

A. See page 68. B. See pages 68 and 69. C. See page 68. D. See page 69.

Replacing the Ice maker

T o remove the existing ice maker (see Figure 50):

1. Unplug the refrigerator or ice maker AC power cord from the RV AC power receptacle.

2. Remove the freezer bolts along with the flat washers (two, 1 inch long screws).

3. Remove two upper mounting screws (two, 1/2 inch screws).

4. Unplug the wire harness from the ice maker.

5. Remove two mounting plate screws (two Phillips head screws), then remove the mounting plate.

6. Remove the shut-off arm and install it in the new ice maker.

7. Attach the mounting plate to the bottom of the new ice maker (two Phillips head screws). Tighten screws firmly.

8. Plug the wire harness into the ice maker. Make sure the plug locking tab locks the plug in the connector.

9. Attach the mounting plate to the freezer plate (two, 1 inch long screws with washers)

10. Attach the upper mounting brackets to the freezer plate (two, 1/2 inch screws).

1 1 . Tighten all screws firmly .

12. Plug the AC cord in the RV AC power recept acle.

Cover

Mounting Screws

Bottom Mounting Screws (2 each)

Freezer Plate Screws (2) (1 in. long with washer)

Figure 50. Ice Maker Mounting Hardware.

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Cycle Test

Cycle testing the ice maker will confirm if the mold heater energizes and motor complete a full cycle. However, if the ejector fingers are trapped in the ice allow the ice to partially thaw before cycle testing the ice maker.

DISCONNECT POWER TO REMOVE MODULE

185W-115V-60 HZ

IM # S 106 626649

11 MAY 00

WB1

To cycle test the ice maker:

1. Shut off the water supply to the ice maker water valve.

2. Remove the ice maker cover.

3. Place the shut-off arm in the ON position (down).

4. Make sure 120 VAC is available to the ice maker .

5. Measure voltage across test points L and N. See Figure

51. Voltage reading should be between 108 to 120 V ac. If no voltage present, check the continuity of the ice maker wire harness.

NOTE

Shorting test points T and H will start the cycle. Remove the jumper wire from test points T and H when a click sound is heard or immediately after 15 seconds of shorting terminals T and H.

WARNING:

Burn hazard! The mold heater will heat the bottom of the mold. Handle or grasp the ice maker by its sides when performing a cycle test.

TRUE RMS MULTIMETER

III

MIN MAX RANGE HOLD

HzREL

PEAK MIN MAX

4 1/2 DIGITS

1 Seconds

µA

OFF

COM

mA µA

400mA MAX

CAT II

FUSED

1000V MAX

10A MAX

FUSED

Shut-Off Arm (ON position)

108 to 120 V ac

Figure 51. T est points L and N.

DISCONNECT POWER TO REMOVE MODULE

185W-115V-60 HZ

IM # S 106 626649

WB1

11 MAY 00

Shut-Off Arm (ON position)

6. Short terminals T and H. An insulated jumper wire 14 AWG with 1/2 inch stripped ends is recommended. See Figure 52. The following events should take place during the cycle:

a. The mold heater begins to heat the mold. b. The ice maker ejector starts to cycle. c. About 15 seconds into the cycle, the thermostat

produces a “click” sound.

NOTE

Remove the jumper wire immediately after hearing the "click" sound or 15 seconds after shorting terminals T and H. Failing remove to the jumper wire will cause damage to the heater and/or overheat the mold, which will ruin the ice maker.

d. As the ejector fingers reach the 12 o'clock position

the water valve energizes.

6. If the water valve does not remain energized between 3.5 and 7.5 seconds, see Water Fill Adjustment, page 70.

Insulated Jumper Wire (14 AWG with 1/2" stripped ends)

Figure 52. T est points T and H.

DISCONNECT POWER TO REMOVE MODULE

185W-115V-60 HZ

IM # S 106 626649

WB1

11 MAY 00

Water fill adjustment alignment indicator

Water fill adjustment screw

Figure 53. Water Fill Adjustment Screw and

Indicator.

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Refrigerator Service ManualN6XX/N8XX Models

Water Fill Adjustment

The ice maker water fill adjustment is factory set. T ampering with the water adjustment screw may cause the water valve to close before the mold is filled to normal level or exceed the mold water level. If the valve closes before the mold is filled to capacity, the ice cubes produced will be small and thin. If the water valve remains open longer than 7.5 seconds, the water level in the mold will be above the normal level. The excess water above the normal level tends to form a layer of ice that fuses all the ice cubes. The surface tension created by the extra layer of ice prevents the ejector from removing the ice cubes from the mold.

The water fill adjustment screw location is shown in Figure 53, page 69. Turning the screw 1/4 turn in a clockwise or counterclockwise direction varies the fill by 0.34 fl. oz. (10 mL).

DISCONNECT POWER TO REMOVE MODULE

185W-115 V-60 HZ

IM # S 106 626649

11 MAY 00

WB1

Insulated jumper wire

(14 AWG with 1/2-stripped ends)

Turning the screw varies the location of the adjustable internal copper contact. The small hole in the contact should be in the center of the module housing hole (alignment indicator). With the hole centered, the water valve should remain open approximately 7.5 seconds.

Low Ice Y ield

The thermostat initiates the cycle when the temperature of the mold is approximately 14°F . For the ice maker mold to reach 14°F, the freezer temperature must be maintained at or below 0°F. In gas absorption refrigerators low ice yield may be caused by poor cooling unit ventilation, which will directly affects freezer temperature.

Water V alve Operation T est

T est water valve operation by shorting point s V and L using an insulated jumper wire. See Figure 54. Shorting points V and L energizes the valve's solenoid. When energized, the solenoid will make an audible click and continuous buzzing sound until the jumper wire is removed.

Water Valve Solenoid Resistance

Always disconnect the ice maker AC power cord before taking resistance readings on the water valve solenoid.

To contact test points V and N, the resistance meter's probes must be at least 1/2 inch long. See Figure 55.

n Resistance values: 295 to 360 Ω. n OL: check for loose wire harness connections at

the water valve or an open solenoid coil.

n 00.0 Ω: indicates a short between the ice maker

and the water valve.

Figure 54. Energizing water valve through test

points V and L.

DISCONNECT POWER TO REMOVE MODULE

185W-115V-60 HZ

IM # S 106 626649

WB1

11 MAY 00

4 1/2 DIGITS 1 Seconds

OFF

10A MAX

FUSED

MIN MAX RANGE HOLD

PEAK MIN MAX

mA µA

400mA MAX

TRUE RMS MULTIMETER

III

HzREL

mA A

µA

COM

CAT II

FUSED

1000V MAX

Shut-Off Arm (ON position)

295 to 360 ohms

Figure 55. Measuring water valve solenoid

resistance across points V and N.

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Mold Heater Resistance Check

Unplug the ice maker AC power cord before taking any resistance readings on the ice maker .

To contact test points L and H, the test probes must be at least 1/2 inch long. Connect the multimeter's probes as shown in Figure 56.

DISCONNECT POWER TO REMOVE MODULE

185W-115V-60 HZ

IM # S 106 626649

11 MAY 00

WB1

n Resistance values: 71 to 79 Ω. n Replace the ice maker if the mold heater

resistance is not within 71 and 79 Ω.

Checking V oltage at Motor Terminals

Make sure AC power is available to the ice maker before taking voltage readings across test points N and M.

To contact test points N and M, the test probes must be at least 1/2 inch long. Figure 57 shows the multimeter connections to points N and M to measure voltage. The voltage across points L and M should be 108 to 132 V ac. If no voltage is detected, make sure replace the ice maker.

Winterizing the Ice Maker Water

To winterize the ice maker:

1. Shut off the RV water supply to the ice maker .

2. Lower the ice maker shut-off arm to the off position.

3. Disconnect the garden hose adapter from the water valve.

4. Disconnect the ice maker water supply line from the water valve. Do not unwrap the water line heater wire from the water valve outlet connection.

5. Allow the water to drain from the RV water supply line and the ice maker water line.

6. Protect connections by bagging and taping RV water supply connection, the ice maker water line connection, and the water valve connections

TRUE RMS MULTIMETER

III

MIN MAX RANGE HOLD

HzREL

PEAK MIN MAX

4 1/2 DIGITS 1 Seconds

µA

OFF

COM

mA µA

400mA MAX

CAT II

FUSED

1000V MAX

10A MAX

FUSED

Shut-Off Arm (ON position)

Figure 56. Measuring mold heater

resistance across test points L and H.

DISCONNECT POWER TO REMOVE MODULE

185W-115V-60 HZ

IM # S 106 626649

WB1

11 MAY 00

PEAK MIN MAX

4 1/2 DIGITS 1 Seconds

OFF

mA µA

10A MAX FUSED

III

MIN MAX RANGE HOLD

400mA MAX FUSED

TRUE RMS MULTIMETER

HzREL

mA A

µA

COM

CAT II

1000V MAX

Shut-Off Arm (ON position)

Figure 57. Checking voltage to motor across test

www.norcold.com/cda

points N and M.

Refrigerator Service ManualN6XX/N8XX Models

Green

Solenoid

Water Valve

Black (ribbed)

Ice Maker

Green

White

Brown

White

Thermal

Fuse

Black (smooth)

AC Power Cord

Power Board

Black

N64X IM/N84XIM – Wiring Pictorial for Ice Maker Wired to Refrigerator AC Cord.

Switch

(Shut-off arm)

OFF

Black

Ground

Thermal Fuse

Green

Mold Heater

Thermostat

White

Motor

Fill switch

Brown

Solenoid

(water valve)

Motor switch

N64X IM/N84XIM – Wiring Schematic for Ice Maker Wired to Refrigerator AC Cord.

www.norcold.com/cda 71N6XX/N8XX ModelsRefrigerator Service Manual

Ground

Connection

/ V

Solenoid

Water Valve

Ice Maker

GRN / VERT

BRN BRUN

Thermal

Fuse

WHT / BLANC

BLK / NOIR

AC Power Cord

NEUTRAL (RIBBED) / NEUTRE (À NERVURES)

HOT(SMOOTH)/ CHAUD (PLAT)

WHT / BLANC

N64X IM/N84XIM – Wiring Pictorial for Ice Maker Wired to White AC Power Cord

Switch

(Shut-off arm)

OFF

Black

Ground

Thermal Fuse

Green

Mold Heater

Thermostat

White

Motor

Fill switch

Brown

Solenoid

(water valve)

Motor switch

N64X IM/N84XIM – Wiring Schematic for Ice Maker Wired to White AC Power Cord

www.norcold.com/cda

Refrigerator Service ManualN6XX/N8XX Models

N61X/N81X

Publication No. 619394E (0-28-04)

N62X/N82X

N64X/N84X/N64X.3/N84X.3

NORCOLD®

P. O. Box 4248 Sidney, OH 45365-4248

NORCOLD CUSTOMER SERVICE

Telephone ............................... 1-800-444-7210

Fax ...............................................937-497-3183

World Wide Web........... www. norcold.com/cda

Norcold N61X, N62X, N64X, N64X.3, N81X User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

INTRODUCTION

SAFETY AW ARENESS

SPECIFICATIONS

N61X/N81X DISPLA YED FAUL T CODES

N62X/N82X DISPLA YED FAUL T CODES

N64X/N84X DISPLA YED FAULT CODES

TROUBLESHOOTING FLOWCHARTS

VENTILATION

LP GAS SYSTEM

ELECTRICAL REQUIREMENTS AND COMPONENTS

COOLING UNIT

ELECTRONIC COMPONENTS

CONTROLS

ICE MAKER