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© 2013 NORCOLD, INC. All rights reserved.
Gas / Electric Refrigerators
DO NOT install this refrigerator in below deck marine applications. Do not
install this refrigerator in fi xed 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.
Service Manual
MODELS
NX61 / NX81
NX64 / NX84
NXA64 / NXA84
NX64XIM / NX84XIM
NXA64XIM / NXA84XIM
NX64.3 / NX84.3
NXA64.3 / NXA84.3
!
WARNING
Publication No. 636104B (27.01.2015)
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Table of Contents
Troubleshooting
Related Manuals for Norcold NX61
Summary of Contents for Norcold NX61
- Page 1 DO NOT install this refrigerator in below deck marine applications. Do not install this refrigerator in fi xed 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.
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Page 2: Table Of Contents
About Installation ..................4 Reset a Gas Lockout Condition - All Models ......... 44 Replacement Parts ................. 4 NX61 / NX81, NX64 / NX84, NXA64 / NXA84 Gas Safety Valve Test: . 44 Technical Assistance ................4 Electrical Requirements and Components ..........45 Model Identifi... - Page 3 Fig. 40 - Cooling System Diagnostics ..........50 Fig. 41 - Wiring - NX61 / NX81, NX64 / NX84, NXA64 / NXA84 ..52 Fig. 42 - Wiring - NX61 / NX81, NX64 / NX84, NXA64 / NXA84 ..53 Fig.
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Page 4: Introduction
Model Identifi cation Replacement Parts Models NX61, NX81, NX64, NXA64, NX84 and NXA84 are Use only authorized NORCOLD replacement parts. ®... -
Page 5: Model Identifi Cation
Serial Number / Model Number Location G. DC Voltage/amperage Fig. 1 - Refrigerator Information Label Location Explanation N = Norcold X = Sequence number indicating custom features 6 or 8 = Approximate storage volume in cubic feet X = Sequence number indicating custom features Models available. -
Page 6: Safety Awareness
(retaining screws, etc.), are properly fastened. 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 fi re. NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 7: Specifi Cations
Upper panel ---------------------------------------------------------------------------------------------15 11/16 in. x 21 19/32 in. Fresh food compartment (H x W) NX61 / NX64 / NXA64 ------------------------------------------------------------------------------ 32 25/32 in. x 21 19/32 in. NX81 / NX84 / NXA84 ------------------------------------------------------------------------------- 39 25/32 in. x 21 19/32 in. -
Page 8: Theory Of Operation
• Insect screen covering vents • Plastic sheeting covering vents • Items stored in the enclosure • Modifi cations to vents or enclosure • No roof or sidewall vent openings NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 9: Gas Absorption System
(liquefi es) into pure liquid ammonia (LA). The liquid ammonia, via gravity, drops into the tubular coil of the freezer and cabinet evaporators and wets the internal surface of the tubes. Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 10: Electronic Controls
• 3rd Priority Choice – (3-way models only) - DC • NX61 / NX81 = Power ON indicator is Solid RED Electric (DC cartridge type heater) • NX64 / NX84 = "no AC" with audible alarm/beeper •... -
Page 11: Manual Lp Gas Mode
• NX61 / NX81 = Power ON indicator light fl ashes If for some reason the fl ame goes away while there is a call RED once, OFF for 5-seconds, repeats for cooling, at the request of the optical display board, the •... -
Page 12: Auto Mode
Automatically default back to the Auto AC mode and wait for AC voltage to return, displaying the following fault code • NX61 / NX81 Models: Solid RED power indicator light • NX64 / NX84 Models: "no AC" "no FL" with audible alarm/beeper •... -
Page 13: Background Operations
• NX61 / NX81: Solid RED power indicator light optical display board. The thermistor, a temperature device whose internal resistance goes down as the temperature goes •... -
Page 14: Table 1: Temperature Set Points Nx61 / Nx81
LP gas burner, until the thermistor value reaches 38°F. Coldest Once the 38°F requirement is met the optical display will exit the defrost mode, reset the 49 hour timer, and continue normal Table 1: Temperature Set Points NX61 / NX81 operation. NX6 / NX8 / NXA Models www.norcold.com/cda... -
Page 15: Diagnostic Prechecks
The refrigerator is connected to a known working DC power supply and/or battery supplying between 10.5 and 15.4VDC LP gas is available to the refrigerator and is regulated between 10.5 and 11.5”WC (Inches of Water Column) Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 16: Fault Codes
NX61 / NX81 Fault Codes Manual LP Mode: A fl ame was NOT established or a fl ame was NOT sensed The NX61/NX81 model refrigerators have the ability to recognize various fault conditions and will display a unique Verify: error/fault code accordingly. With the exception of the •... -
Page 17: Fault / Flash Pattern 1 Ac Heater Error
NX61 / NX81 Fault Codes - cont’d Fault / Flash Pattern 3 Fault / Flash Pattern 1 Open High Limit AC Heater Error Power ON indicator light flashes ON once, OFF for 5-seconds, repeats Power ON indicator light flashes ON three times, OFF for 5-seconds, repeats... -
Page 18: Flame On Should Not Be On
NX61 / NX81 Fault Codes - cont’d Fault / Flash Pattern 9 LOW DC (2) Error Fault / Flash Pattern 5 Flame On Should Not Be On Power ON indicator light flashes ON nine times, OFF for 5-seconds, repeats Power ON indicator light flashes ON five times, OFF for 5-seconds, repeats... -
Page 19: Thermistor Fault
NX61 / NX81 Fault Codes - cont’d is monitored by the optical display board and communicated Thermistor Fault back to the power board which in turn activates the interior light output accordingly. Because the switch operates via the proximity of the magnet, it is important that the door alignment is correct. - Page 20 NX61 / NX81 Fault Codes - cont’d Note: K3 is a latching relay. Once the relay coil is energized the contacts close and remain closed even when the 12VDC is removed, hence the term “latching relay”. With the K3 contacts now closed, 12VDC is...
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Page 21: Fig. 6 - Nx61 / Nx81, Nx64 / Nx84, Nxa64 / Nxa84 Continuous 12-Volt
AC_HT_LO BU/BL GN/VE ON-OFF (Exaggerated view) WH-VT/BC-VT Vreg WH/BC DISPLAY BOARD POWER BOARD Fig. 6 - NX61 / NX81, NX64 / NX84, NXA64 / NXA84 Continuous 12-Volt 12VDC/VCD (BAT POS) 12VDC 12VDC/VCD (BAT NEG) YL-GN/JN-VE GN/VE BK/NR LIMIT_OUT LIMIT_IN AC_HT_HI_2... -
Page 22: Nx64 / Nx84, Nxa64 / Nxa84 Fault Codes
"Wiring Pictorial" on page 3/16” 53 for proper connection. • The spark-sense igniter wire is installed correctly and in • If yes, contact Customer Service for further instructions. good operating condition NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... - Page 23 Verify DC heater resistance measures between 0.65Ω and 0.75Ω: • No - replace DC heater • Yes - Replace power board • If voltage is in range, replace power board. Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models...
- Page 24 Verify: • That the battery charging equipment of the vehicle is operational • That the AC/DC converter is operational (if applicable) • If voltage is within range, replace power board NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual...
- Page 25 For example, if the temperature setting is set to 5, adjusting the temperature setting to the NORCOLD next colder setting of 6 will lengthen the cooling cycle. When a warmer temperature is desired, changing the temperature setting to a warmer setting shortens the cooling cycle.
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Page 26: Diagnostic Mode - Nx64 / Nx84, Nxa64 / Nxa84
DIAGNOSTIC MODE - NX64 / NX84, NXA64 / NXA84 NORCOLD Art02397 Fig. 8 - NX64 / NX84, NXA64 / NXA84 Display Board 30 - Power On/Off Button 280 - LCD (Liquid Crystal Display) 31 - Mode Button 278 - Temperature Setting... -
Page 27: Screens And Diagnostic Segments Information
The illustration below shows the fi n temperature to be 20°F Diagnostic Screen 3 (Second View) Diagnostic Screen 3 (Initial View) MODE Press the button to bring up screen 4. Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... - Page 28 AC voltage higher than 132 volt active or "live," its assigned output LED will be on. Not used Not used AC voltage normal Not used Not used AC voltage lower than 85 volts NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual...
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Page 29: Ventilation
Roof Exhaust Vent The heat absorbed by ventilation air and combustion gases • Installation Manual for NX61, NX81 fl ow out of the enclosure through the roof exhaust vent. See • Installation Manual for NX64 / NX84, NXA64 / NXA84 Figs. -
Page 30: Baffles
1/8 inch 0 inch 1/4 inch Rear 0 inch 1 inch Fig. 12 - Baffl es Required for an Inboard Roof Exhaust Vent Installation Table 3: Clearances for Roof Vented Installations NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 31: Vertical Enclosures
E nclos ure depths of 24 in. Vent even or below enclosure floor. or more an d les s than 25 in. Fig. 13 - Vertical Enclosure Depth of 24 > 26 Inches Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 32: Fig. 14 - Vertical Enclosure Depth Of 26 > Inches
. E nclos ure de pths of 26 in. or more Vent ev en or below e nclosure floor. Fig. 14 - Vertical Enclosure Depth of 26 > Inches NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 33: Fig. 15 - Offset Vertical Enclosure Depth Of 24 > 25 Inches
24 in. or more a nd les s than 25 in. Vent ev en or below enclosure f loor. Fig. 15 - Offset Vertical Enclosure Depth of 24 > 25 Inches Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 34: Fig. 16 - Offset Vertical Enclosure Depth Of 26 > Inches
E nclos ure de pths of 26 in. or more Vent ev en or below enclosure floor. Fig. 16 - Offset Vertical Enclosure Depth of 26 > Inches NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 35: Double Sidewall Venting
• Installation Manual for NX61, NX81 As the result of this testing, NORCOLD was able to reduce • Installation Manual for NX64 / NX84, NXA64 / NXA84 the baffl e confi guration down to two baffl es for the NX6X and •... -
Page 36: Double Side Wall Venting
E nclos ure depths of more than 24 in. and less than 26 in. Vent ev en or below enclosure floor. Fig. 17 - Double Side Wall Enclosure Depths of 24 > 26 Inches NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 37: Fig. 18 - Double Side Wall Enclosure Depth Of 26 > Inches
N1 09X - 24.8 in Vent even or below enclosure floor. E nclosure depths of 2 6 in. or more Fig. 18 - Double Side Wall Enclosure Depth of 26 > Inches Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 38: Lp Gas System
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. NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 39: Components
Fig. 20 - Solenoid Gas Valve. Solenoid Gas Valve Connections The solenoid gas valve inlet fi tting is 3/8 inch, male threads; the outlet fi tting is 1/4 inch, male threads. Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 40: Fig. 21 - Lp15 Orifice Assemblies
LP gas mode. Burner Tube The burner tube is 1/4 inch OD aluminum tubing with an anti- vibration loop and a double fl are at each end. See Fig. 23. NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 41: Flame Appearance
A fl ame that is mostly orange or yellow, is erratic, and unstable, indicates a "dirty" burner. Burner cleaning procedures appear on page 32. page 42 Fig. 26 - Flame Appearance Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 42: Burner Cleaning Procedure
LP gas • Close the LP gas valve and the solenoid gas valve fl ow to the burner and create a fi re hazard potential. manual shut-off. NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 43: Fig. 27 - Drip Cup And Burner Box Cover
Solenoid gas valve manual shut-off Drip Cup Fig. 27 - Drip Cup and Burner Box Cover Canister Flue Baffle Electrode Burner Orifice adapter with LP15 orifice Fig. 28 - Burner and Components Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 44: Gas Lockout
NX61 / NX81, NX64 / NX84, NXA64 / NXA84 Gas Safety Valve Test: Conditions That Cause Air in Gas Supply Lines Open lower intake vent at refrigerator rear. -
Page 45: Electrical Requirements And Components
Always use the specifi ed fuse. the refrigerator from turning off. The DC heater circuit fuse is a standard 30 amp (green) automotive blade type fuse. It is located on the DC board, labeled F1. Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 46: Ac Power Requirements
Canister Door Fig. 30 - AC and DC Heaters (3-way refrigerator) Connector Light bracket Stop Bead Lightbulb Light cover NX61 / NX81, NX64 / NX84 Black Wire Leads NXA64 / NXA84 Fig. 32 - AC Heater. Thermistor Clip When poor or no cooling in AUTO AC or AC-Manual Mode, is present: Measure AC voltage input to the power board. -
Page 47: 12Vdc Ventilation Fan
130 °F. The switch turns the fan off when fi n temperature falls to approximately 115 °F. fan kit is wired to the power board 12VDC NORCOLD ® Outer bracket and mounting screws connections using "Y" type wire connector. The fan circuit is protected by an in-line fuse (included in the kit). -
Page 48: Low Ambient Heater (Optional)
- 12 Vdc connection + 12 Vdc connection 12 Vdc 12 Vdc Fig. 36 - Fan with Installed NORCOLD Fan Kit Fig. 37 - NORCOLD Fan Kit Wiring Pictorial Low Ambient Heater (optional) Models NXA641.3, NXA6421.3F, NXA841.3, and NXA841.3F are equipped with a low ambient heater. -
Page 49: Troubleshooting Cooling Faults
Do not work on live circuits! Turn off AC power and authorized Norcold Service technician. DC power before attempting to remove, service, or repair any of the refrigerator's electrical or electronic Troubleshooting Cooling Faults circuits or components. -
Page 50: Cooling System Diagnostic Flowchart
Heat input device operating within meet specifications specification? Level refrigerator as outlined Refrigerator in Owner's Manual and operating leveled? specifications. Continued on following page Fig. 40 - Cooling System Diagnostics NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... - Page 51 Unit is operating normally. setting for a period of 8-12 hours. normal ■ Freezer -5°F to -10°F. ■ Fin temperature 18°F to 25°F. Contact Customer Service Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models...
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Page 52: Electrical Requirements And Components
TEMP WH-VT/BC-VT Vreg 120VAC MICRO 120VCA WH/BC BETTER DISPLAY BOARD/ MIEUX CARTE D’AFFICHAGE POWER BOARD Fig. 41 - Wiring Pictorial - NX61 / NX81, NX64 / NX84, NXA64 / NXA84 NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 53: Fig. 42 - Wiring - Nx61 / Nx81, Nx64 / Nx84, Nxa64 / Nxa84
AC_HT_LO AC_HT_LO_2 AC_HT_HI AC_HT_HI_2 LIMIT_IN LIMIT_OUT 5 AMP 12VDC HTR_GND -12VDC/VCD +12VDC/VCD DC_HTR 30 AMP Fig. 42 - Wiring Pictorial - NX61 / NX81, NX64 / NX84, NXA64 / NXA84 Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 54: Modes Of Operation - Nx61, Nx81
MODES OF OPERATION - NX61, NX81 MODE NORCOLD COLD COLDEST Fig. 43 - NX61, NX81 Display Board Art02393 30 - Power On/Off Button 185 - Power On Indicator 31 - Mode Button 277, 278, 279 - Application Mode Indicator 32 - Temperature Set Button... -
Page 55: Modes Of Operation - Nx64 / Nx84, Nxa64 / Nxa84
MODES OF OPERATION - NX64 / NX84, NXA64 / NXA84 NORCOLD Fig. 44 - NX64 / NX84, NXA64 / NXA84 Display Board 30 - Power On/Off Button 280 - LCD (Liquid Crystal Display) 31 - Mode Button 278 - Temperature Setting... -
Page 56: Shut Down
AC indicator is on. Green POWER ON indicator is on. The refrigerator is operating in Manual propane gas mode. GAS indicator is on. Table 6: NX64 / NX84, NXA64 / NXA84 Display Codes NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 57: Ice Maker
120 Vac Terminals Heater Foil Type Wire Lead Water Line Heater Water Valve Assembly Water Valve Assembly without water line heater with water line heater Fig. 45 - Ice Maker Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 58: Ice Maker Troubleshooting Chart
11. Tighten all screws fi rmly. (2 each) 12. Plug the AC cord in the RV AC power receptacle. Freezer Plate Screws (2) (1 in. long with washer) Fig. 46 - Ice Maker Mounting Hardware NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 59: Cycle Test
H. Failing remove jumper wire will cause damage Water fill to the heater and/or overheat the mold, which will ruin adjustment screw the ice maker. Fig. 49 - Water Fill Adjustment Screw and Indicator. Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 60: Water Fill Adjustment
PEAK MIN MAX 1 Seconds μA mA μA 295 to 360 ohms 400mA MAX CAT II 10A MAX FUSED 1000V MAX FUSED Fig. 51 - Measure water valve solenoid resistance NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual... -
Page 61: Mold Heater Resistance Check
RANGE HOLD 4 1/2 DIGITS PEAK MIN MAX 1 Seconds μA mA μA 400mA MAX CAT II 10A MAX FUSED 1000V MAX FUSED Fig. 53 - Check voltage to motor Refrigerator Service Manual www.norcold.com/cda NX6 / NX8 / NXA Models... -
Page 62: Fig. 54 - Nx64Im / Nx84Xim, Nxa64Im / Nxa84Xim - Ice Maker Wired To Refrigerator Ac Cord
Green Ground Wiring Schematic Solenoid Fill switch (water valve) Brown Motor Motor switch Fig. 55 - NX64IM / NX84XIM, NXA64IM / NXA84XIM – Ice Maker Wired to Unit Refrigerator Cord NX6 / NX8 / NXA Models www.norcold.com/cda Refrigerator Service Manual...
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