Table Of Contents - Norcold NX61 Service Manual

Introduction .................................................................................................. 4
About this Manual ................................................................................... 4
Model Identification ................................................................................. 4
Information Label .................................................................................... 4
Certification and Code Requirements ..................................................... 4
About Installation .................................................................................... 4
Replacement Parts ................................................................................. 4
Technical Assistance ............................................................................... 4
Model Identifi cation ..................................................................................... 5
Cooling Unit Serial Number .................................................................... 5
Safety Awareness ........................................................................................ 6
Safety Notice ........................................................................................... 6
Attention Statements ............................................................................... 6
Safety Statements ................................................................................... 6
Specifi cations .............................................................................................. 7
NX61 / NX81, NX64 / NX84, NXA64 / NXA84 ........................................ 7
Theory of Operation .................................................................................... 8
Overview ................................................................................................. 8
Cooling Unit ............................................................................................ 8
Leveled Operation ................................................................................... 8
Gradual Decrease in Cooling Efficiency ................................................. 8
Gas Absorption System .......................................................................... 9
Electronic Controls ................................................................................ 10
Manual AC Mode .................................................................................. 10
Manual LP Gas Mode ............................................................................11
Manual DC Mode (3-way models only) ..................................................11
Auto Mode ............................................................................................. 12
Theory of Operation -
Auto Modes ......................................................................................... 12
Background Operations ........................................................................ 13
Diagnostic Prechecks ................................................................................ 15
Fault Codes ............................................................................................... 16
NX61 / NX81 Fault Codes ..................................................................... 16
Solid Red Indicator Light .............................................................. 16
Fault / Flash Pattern 1 AC Heater Error ......................................... 17
Fault / Flash Pattern 2 Service Error .............................................. 17
Fault / Flash Pattern 3
Open High Limit ................................................................................ 17
Fault / Flash Pattern 4
AC Relay Error ................................................................................. 17
Fault / Flash Pattern 5
Flame On Should Not Be On ............................................................ 18
Fault / Flash Pattern 8
LOW DC (1) Error ............................................................................. 18
Fault / Flash Pattern 9 LOW DC (2) Error ...................................... 18
Thermistor Fault ............................................................................. 19
Door Fault ....................................................................................... 19
Blank Display .................................................................................. 19
NX64 / NX84, NXA64 / NXA84 Fault Codes ......................................... 22
Diagnostic Mode - NX64 / NX84, NXA64 / NXA84 .................................... 26
Screens and Diagnostic Segments Information .................................... 27
Ventilation .................................................................................................. 29
Roof Exhaust Venting ........................................................................... 29
Air Intake Vent ....................................................................................... 29
Roof Exhaust Vent ................................................................................ 29
Baffles ................................................................................................... 30
Vertical Enclosures ............................................................................... 31
Double Sidewall Venting ....................................................................... 35
Double Side Wall Venting...................................................................... 36
LP Gas System ......................................................................................... 38
Pressure Requirements ........................................................................ 38
2
NX6 / NX8 / NXA Models
CONTENTS
Testing for LP Gas Leaks ...................................................................... 38
Components .......................................................................................... 39
Flame Appearance ................................................................................ 41
Burner Cleaning Procedure .................................................................. 42
Gas Lockout .......................................................................................... 44
Reset a Gas Lockout Condition - All Models ......................................... 44
NX61 / NX81, NX64 / NX84, NXA64 / NXA84 Gas Safety Valve Test: . 44
Electrical Requirements and Components ................................................ 45
DC Voltage Requirements and Polarity ................................................ 45
DC Power Wiring Requirements ........................................................... 45
AC/DC Converter as Power Source ...................................................... 45
AC Power Requirements ...................................................................... 46
12VDC Ventilation Fan .......................................................................... 47
Low Ambient Heater (optional) .............................................................. 48
Cooling Unit ............................................................................................... 48
Cooling System Monitoring ................................................................... 48
Troubleshooting Cooling Faults ............................................................ 49
Refrigerant Leakage ............................................................................. 49
Disposal of Cooling Unit ........................................................................ 49
Cooling System Diagnostic Flowchart .................................................. 50
Electrical Requirements and Components ............................................ 52
Modes of Operation - NX61, NX81 ........................................................... 54
Start Up: ................................................................................................ 54
Shut Down: ........................................................................................... 54
Modes of Operation - NX64 / NX84, NXA64 / NXA84 .............................. 55
Start Up: ................................................................................................ 55
2-way Model Mode Indicators ............................................................... 55
3-way Model Mode Indicators ............................................................... 55
Shut Down: ........................................................................................... 56
NX64 / NX84, NXA64 / NXA84 Display Codes ......................................... 56
Ice Maker ................................................................................................... 57
Wire Harness ........................................................................................ 57
Fill Tube ................................................................................................ 57
Water Valve ........................................................................................... 57
Specifications ........................................................................................ 57
Ice Maker Troubleshooting Chart .......................................................... 58
Replacing the Ice Maker ....................................................................... 58
Cycle Test ............................................................................................. 59
Water Fill Adjustment ............................................................................ 60
Low Ice Yield ......................................................................................... 60
Water Valve Operation Test .................................................................. 60
Water Valve Solenoid Resistance ......................................................... 60
Mold Heater Resistance Check ............................................................ 61
Checking Voltage at Motor Terminals ................................................... 61
Winterizing the Ice Maker Water ........................................................... 61
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