Norcold Polar N7V, Polar N7X, Polar N8V, Polar N8X, Polar N8LX Service Manual
...
Service Manual
Gas Electric Refrigerators
Improper installation, adjustment, alteration, service or maintenance can cause
personal injury or property damage. Refer
to this manual. For assistance or addition-
al information, contact a qualied installer,
service agency, or the gas supplier.
Polar 7 Series (N7V, N7X, N7LX) Models
Polar 8 Series (N8V, N8X, N8LX) Models
© 2017 NORCOLD, INC. All rights reserved.
Questions? 1-800-444-7210
Part No. 639410 Rev. A 04.17.2018
CONTENTS
SAFETY .......................................................................................4
INTRODUCTION .......................................................................... 5
About this Manual ...........................................................................................5
Certification and Code Requirements .............................................................5
About Installation .............................................................................................5
Replacement Parts ..........................................................................................5
Technical Assistance ....................................................................................... 5
Model Identification .........................................................................................6
Cooling Unit Serial Number .............................................................................6
Refrigerator Model Number .............................................................................6
SPECIFICATIONS ........................................................................ 7
Exploded Views ...............................................................................................8
GENERAL INFORMATION ........................................................ 10
Ventilation .....................................................................................................10
Overview .....................................................................................................10
Enclosure ....................................................................................................10
Baffles .........................................................................................................10
Lower Intake Vent ......................................................................................10
Exhaust Vent ...............................................................................................10
Roof Cap .....................................................................................................10
Propane Gas Connections ............................................................................ 11
Leak Test-Detergent .................................................................................... 11
Electrical Connections ...................................................................................11
120 Volts AC Electrical Connection ............................................................. 11
12 Volts DC Electrical Connection ..............................................................11
Main Control Board (Power Board) Fuses ..................................................12
Electrical Components ..................................................................................12
Interior Light ................................................................................................12
Divider Heater ............................................................................................12
12 Volt DC Fan ............................................................................................12
Low Ambient Heater (optional) ....................................................................12
Temperature Control System ...................................................................... 13
Backup Operating System ..........................................................................13
PREVENTATIVE MAINTENANCE ............................................. 13
Gas Flame Appearance ................................................................................13
Clean the Openings of the Burner Tube ........................................................14
USER INTERFACE (CONTROLS) - N7V AND N8V MODELS . 15
Power ON / OFF Button ................................................................................15
Modes of Operation .......................................................................................15
Air in the Propane Gas Supply Lines ............................................................16
Refrigerator Temperature Settings ................................................................ 16
Diagnostic Prechecks ....................................................................................16
FAULT CODES - N7V AND N8V MODELS ..............................17
Fault Code Flash Patterns - N7V and N8V Models .......................................17
TROUBLESHOOTING FLOWCHARTS - N7V AND N8V MODELS
18
Fault - Code - Solid Red Indicator Light ........................................................18
Fault Code - Flash Pattern 1 .........................................................................20
Fault Code - Flash Pattern 2 .........................................................................21
Fault Code - Flash Pattern 3 .........................................................................21
Fault Code - Flash Pattern 4 .........................................................................21
Fault Code - Flash Pattern 5 .........................................................................22
Fault Code - Flash Pattern 8 .........................................................................22
Fault Code - Flash Pattern 9 .........................................................................22
Fault Code - Flash Pattern 10 .......................................................................23
Fault Code - Thermistor Fault .......................................................................24
Blank Display ................................................................................................25
USER INTERFACE (CONTROLS) - N7X AND N8X MODELS . 26
Power ON / OFF Button ................................................................................26
Mode Button ..................................................................................................26
Temperature Set Button ................................................................................ 26
Temperature Setting Indicators ..................................................................... 26
Gas Mode Operation .....................................................................................26
AC Mode Operation ......................................................................................26
Air in the Propane Gas Supply Lines ............................................................27
Diagnostic Prechecks ....................................................................................27
FAULT CODES - N7X AND N8X MODELS ..............................27
Fault Code Flash Patterns - N7X and N8X Models .......................................27
Fault Code - Flash Patterns ..........................................................................28
TROUBLESHOOTING FLOWCHARTS - N7X AND N8X MODELS
29
Fault Code - Solid Red Indicator Light ..........................................................29
Fault Code - Flash Pattern 1 .........................................................................31
Fault Code - Flash Pattern 2 .........................................................................32
Fault Code - Flash Pattern 3 .........................................................................32
Fault Code - Flash Pattern 4 .........................................................................32
Fault Code - Flash Pattern 5 .........................................................................33
Fault Code - Flash Pattern 8 .........................................................................33
Fault Code - Flash Pattern 9 .........................................................................33
Fault Code - Flash Pattern 10 .......................................................................34
Fault Code - Thermistor Fault .......................................................................35
Blank Display ................................................................................................36
USER INTERFACE (CONTROLS) - N7LX AND N8LX MODELS 37
Power ON / OFF Button ................................................................................37
Mode Button ..................................................................................................37
Temperature Set Button ................................................................................ 37
Gas Operation ...............................................................................................37
Gas Mode ......................................................................................................38
AC Mode .......................................................................................................38
DC Mode (3-way models only) ......................................................................38
Air in the Propane Gas Supply Lines ............................................................38
Diagnostic Pre checks ...................................................................................38
FAULT CODES - N7LX AND N8LX MODELS ........................39
Polar Series N7V, N7X, N7XL / N8V, N8X, N8XL
2
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TROUBLESHOOTING FLOWCHARTS - N7LX AND N8LX
MODELS ....................................................................................40
Fault Code - “no” “FL” with audible alarm .....................................................40
Fault Code - “no” “AC” with audible alarm .....................................................42
Fault Code - “AC” “HE” with audible alarm ....................................................43
Fault Code - “dc” “HE” with audible alarm .....................................................44
Fault Code - “AC” “rE” with audible alarm .....................................................44
Fault Code - “dc” “rE” with audible alarm ......................................................44
Fault Code - “Lo” “dc” ....................................................................................45
Fault Code - “Lo” “dc” with audible alarm ......................................................45
Fault Code - “Lo” “dC” with audible alarm .....................................................45
Fault Code - “HI” “dc” with audible alarm ......................................................45
Fault Code - “no” “dt” with audible alarm .......................................................46
Fault Code - “Sr” with audible alarm .............................................................47
Fault Code - “oP” “LI” with audible alarm ......................................................47
Fault Code - “FL” “- -” with audible alarm ......................................................47
Fault Code - Flashing Temperature Setting ..................................................48
Blank Display ................................................................................................49
DIAGNOSTIC MODE - N7LX AND N8LX MODELS .................50
General Diagnostic Information .....................................................................50
Access Diagnostic Mode ...............................................................................50
Change Screens ...........................................................................................50
Exit Diagnostic Mode ....................................................................................50
Screens and Diagnostic Segments Information ............................................50
SCREEN 1: All Diagnostic Icons ON ..........................................................50
SCREEN 2: All Diagnostic Icons OFF .........................................................50
SCREEN 3: Fresh Food Fin Temperature ..................................................50
SCREEN 4: Stored Fault History ................................................................51
SCREEN 5. Stored Fault History ................................................................51
SCREEN 6. Erasing Fault History ...............................................................51
SCREEN 7. Power Board Inputs ................................................................51
SCREEN 8. Power Board Outputs ..............................................................52
SCREEN 9. Power Board DC Input Voltage Status ....................................52
SCREEN 0. Power Board AC Input Voltage Status .................................... 52
SCREEN A. .................................................................................................52
SCREEN B. .................................................................................................52
Cooling System Diagnostic Flowchart ...........................................................53
Figures
Fig. 1 - Double-wrenching gas fittings ...........................................................5
Fig. 2 - Cooling unit bar code label location. .................................................6
Fig. 3 - Refrigerator information label location .............................................6
Fig. 4 - Exploded front view .........................................................................8
Fig. 5 - Exploded rear view ..........................................................................9
Fig. 6 - Typical roof exhaust venting .........................................................11
Fig. 7 - Fuse locations .................................................................................12
Fig. 8 - Fan wiring .......................................................................................12
Fig. 9 - Burner tube location .......................................................................14
Fig. 10 - Openings of the burner tube .........................................................14
Fig. 11 - N7V and N8V user interface (control) locations ............................15
Fig. 12 - Change mode and temperature setting ........................................15
Fig. 13 - Example fault code flash pattern ..................................................17
Fig. 14 - N7X and N8X user interface (control) locations ............................26
Fig. 15 - N7LX and N8LX user interface (control locations .........................37
Fig. 16 - Wiring diagram .............................................................................55
Fig. 17 - Wiring pictorial ..............................................................................56
Fig. 18 - Fan only wiring ..............................................................................57
Fig. 19 - Cold weather heater only wiring ...................................................57
Fig. 20 - Fan and cold weather heater wiring ..............................................58
Fig. 21 - Ice maker only wiring ....................................................................58
Fig. 22 - Ice maker and fan wiring ...............................................................59
Fig. 23 - Ice maker, fan, and cold weather heater wiring ............................59
WIRING SCHEMATIC ................................................................ 55
ICE MAKER* ...............................................................................................55
WIRING PICTORIAL ..................................................................56
AUXILIARY WIRING CIRCUITS ................................................57
Fan Only ........................................................................................................57
Cold Weather Heater Only ............................................................................57
Fan and Cold Weather Heater ......................................................................58
Ice Maker Only ..............................................................................................58
Ice Maker and Fan ........................................................................................59
Ice Maker, Fan, and Cold Weather Heater ....................................................59
ICE MAKER ...............................................................................60
REMOVE / REPLACE THE REFRIGERATOR .......................... 60
Remove the Refrigerator ...............................................................................60
Replace the Refrigerator ...............................................................................60
Conduct Leak Test ........................................................................................60
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3
SERVICE MANUAL
CAUTION
WARNING
SAFETY
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 ammable
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.
Read this manual carefully and understand the contents before
working on the refrigerator. Be aware of possible safety hazards
when you see the safety alert symbol on the refrigerator and in this
manual. A signal word follows the safety alert symbol and identies
the danger of the hazard. Carefully read the descriptions of these
signal words to fully know their meanings. They are for your safety.
This signal word means a hazard, which if
!
!
ATTENTION
ignored, can cause small personal injury
or much property damage.
This signal word means a hazard, which
if ignored, can cause dangerous personal
injury, death.
Norcold refrigerators are designed and
equipped for the use of propane gas only.
Do not modify, alter, or equip the refrigerator to any other fuel (natural gas, butane,
etc.).
Incorrect installation, adjustment, alteration, or maintenance of the refrigerator
can cause personal injury, property damage, or both.
Do not smoke, light res, or create sparks
when working on propane gas system.
Propane gas is highly ammable and
explosive. Do not use an open ame for
leak testing any of propane gas system
components.
Always use two wrenches to tighten or
loosen propane 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 ap-
plicable codes. Refer to the “Certication
and Code Requirements” section of the
Installation Manual.
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 work on
live electrical circuits.
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 outlets, connections or 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 re.
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.
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 ammable, can
ignite and burns with an intense ame.
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
specied fuses and AWG wire sizes. The
specication section of this manual pro-
vides fuse size information. Refer to the
Installation Manual for the correct AWG
wire size specications.
Prevent child entrapment! Before disposing of the refrigerator, remove all doors
and fasten all shelves with retainers.
Make sure all hardware such as hinges
and fasteners (retaining screws, etc.), are
properly fastened.
Obey the instructions in this manual with
regard to intake and exhaust venting
specications.
Do not install the refrigerator directly on
carpet. Put the refrigerator on a metal or
wood panel that extends the full width and
depth of the refrigerator.
Polar Series N7V, N7X, N7XL / N8V, N8X, N8XL
4
www.norcold.com
CAUTION
Safety, cont’d.
Some of the refrigerator’s metal com-
!
ponents have sharp corners and edges.
Wear hand protection, such as cut resistant gloves, and exercise extreme care
when handling the refrigerator.
Fig. 1 - Double-wrenching gas ttings
NOR000129A-1
INTRODUCTION
About this Manual
This service manual provides maintenance, diagnostic, and repair
information for NORCOLD® N7V, N7X, N7LX, N8V, N8X, and N8LX
Series gas absorption refrigerators. It is a reference tool designed
for technicians who are knowledgeable in the theory and operation
of gas/electric absorption refrigerators, liqueed petroleum (LP)
gas–propane–systems, and AC/DC electrical systems as installed
in a variety of recreational vehicles (RV).
All information, illustrations, and specications 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.
Certication and Code Requirements
NORCOLD® gas/electric absorption refrigerators are certied
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 N7V, N7X,
N7LX, N8V, N8X, and N8LX Series Installation Manual for the
NORCOLD® limited warranty to be in effect. Installation must
also comply with applicable local codes and standards set by the
relevant certication agency.
Replacement Parts
Use only authorized NORCOLD® replacement parts. Generic parts
do not meet NORCOLD® specications for safety, reliability, and
performance. The use of unauthorized aftermarket or generic replacement parts voids the refrigerator’s limited warranty coverage.
Technical Assistance
If unable to resolve technical issues using the information provided
in this manual, technical support is available through NORCOLD®
Customer Service Center:
Telephone: 1-800-444-7210
(
Fax: 1-734-769-2332
3
World Wide Web: www.norcold.com.
8
The following information is required to process technical support
requests:
■ Refrigerator Model Number
■ Refrigerator Serial Number
■ Refrigerator Cooling Unit Serial Number
■ Recreational Vehicle (RV) Make/Model/Year
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5
SERVICE MANUAL
NOTICE
INTRODUCTION, cont’d.
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NORCOLD
x
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Model Identication
Models which include .3 in the model number are 3-way
refrigerators that operate on AC power, propane gas, or DC power.
Models which DO NOT include .3 in the model number are 2-way
refrigerators that operate on AC power or propane gas.
Letter(s) appended to the model number identify factory installed
accessories.
Cooling Unit Serial Number
The cooling unit serial number appears on the cooling unit bar
code label. The label is afxed to the surface of the cooling unit
leveling chamber.
Be sure to have the cooling unit serial
number available if you need technical
support on this component
N000036A-1
1167359
NORCOLD
Fig. 2 - Cooling unit bar code label location.
Refrigerator Model Number
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NORC OLD
A
Serial Number
B
Model Number
Group Code
C
Input Pressure
BTUH
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D
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Fig. 3 - Refrigerator information label location
Refrigerant
x.xx
LBS.
test pressure
E
E
xxx VOLTS - AC xx HZ
x.xx AMPS xxx Watts
xx VDC xx HZ
x.x AMPS xx xx Watts
SA
C
F
G
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S
E
N
D
E
D
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A Serial Number
B Model Number
C Group Code
D BTU / h
E Amount of refrigerant in cooling system
F AC Voltage / Amperage
G DC Voltage / Amperage
Polar Series N7V, N7X, N7XL / N8V, N8X, N8XL
6
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SPECIFICATIONS
N7V, N8V Models - Electronic
• Capacitive Touch - ON/OFF
• Single LED Indicator Light (Multi-Color)
• Self-Diagnostic with Fault Indicators (LED Flash Pattern)
• 2-Way Automatic Operation
• Non-Settable Factory Preset Temperature Setting (With Backup Operating System)
N7X, N8X Models - Electronic
• Capacitive Touch - ON/OFF, Mode, and Temperature Set
• Multiple LED Indicator Lights
• Self-Diagnostic with Fault Indicators (LED Flash Pattern)
• 2-Way Automatic or Manual Operation
• Five (5) Separate Temperature Settings (With Backup Operating System Mode)
• Sleep Mode
N7LX, N8LX Models - Electronic
• Capacitive Touch - ON/OFF, Mode, and Temperature Set
• Backlit LCD Display with Icon, Numerical, and Text Indicators
• Self-Diagnostic with Fault Codes
• 2-Way Automatic or Manual Operation (Standard), 3-Way Automatic or Manual Operation (Optional)
• Nine (9) Separate Temperature Settings (With Backup Operating System Mode)
• Sleep Mode
• 12 Individual Diagnostic Screens
Rough Opening Dimensions (H x W x D)
N7V, N7X, N7LX models ----------------------------------------------------------------------- 52.88 - 53.01 in. x 23.50 - 23.63 x 24.00 - 24.13 in.
N8V, N8X, N8LX models ---------------------------------------------------------------------- 59.88 - 60.01 in. x 23.50 - 23.63 x 24.00 - 24.13 in.
DC (Direct Current) Specications
Electronic Controls DC input voltage requirement --------------------------------------------------------------------------- 10.5 VDC to 16.0 VDC
DC Fuse Requirements
Main Control Board (Power Board) F1-Control Circuit ----------------------------5-Amp, 32V, MINI ® Blade, Automotive Style Fuse
Main Control Board (Power Board) F2-Auxiliary Circuit ------------------------ 7.5-Amp, 32V, MINI ® Blade, Automotive Style Fuse
DC Heater Board F1 (Optional - N7LX, N8LX models only) ---------------- 30-Amp, 32V, ATO/ATC Blade, Automotive Style Fuse
DC Resistance / Amperage Ratings
Divider Heater ------------------------------------------------------------------------------------------43 Ω to 50 Ω, 240mA to 279mA @ 12 VDC
DC Heater (3-Way models only) --------------------------------------------------------------1 each, 6.7 Ω to 7.8 Ω, 16A to 18A @ 12 VDC
Cold Weather Heater (optional) ----------------------------------------------------------------------- 6.7 Ω to 7.8 Ω, 1.5A to 1.8A @ 12 VDC
Ice Maker Water Line Heater (IM models only) ---------------------------------------------------- 6.7 Ω to 7.8 Ω, 1.5A to 1.8A @ 12 VDC
External cooling fan ------------------------------------------------------------------------------------------------------------------430mA @ 12 VDC
Interior Light --------------------------------------------------------------------------------------------------------------------------------------- 180 mA
AC (Alternating Current) Specications
Electronic Controls AC input voltage requirement -------------------------------------------------------------------------- 108VAC to 132VAC
AC Fuse Requirements
Power Board F3 ---------------------------------------------------------------------------------- 8-Amp, 250V Glass FST 5 x 20mm GMA Type
AC Current Draw
AC Heater --------------------------------------------------------1 each, 300W @120VAC, (45.7 Ω to 50.5 Ω), 2.38A to 2.63A @ 120VAC
Ice Maker Water Valve (IM models only) -------------------------------------------------------------------------------------------10W @ 120VAC
Propane gas
Operating pressure ----------------------------------------------------------------------------------------------------------------------- 10.5 - 11.5 inch w.c.
Burner rating (Heat output) ------------------------------------------------------------------------------------------------------ 1750 Btu/h @ 11 in. W.C.
Burner orice size -------------------------------------------------------------------------------------------------------------------- LP18 (not replaceable)
Gas ignition --------------------------------------------------------------------------------------------------------------------- Electronic with ame sensing
Electrode tip-to-burner gap ------------------------------------------------------------------------------------------------------------------- 1/8 to 3/16 inch
Off-level operating limits
Side-to-side-------------------------------------------------------------------------------------------------------------------------------- 3 degrees-maximum
Front-to-back ------------------------------------------------------------------------------------------------------------------------------ 6 degrees-maximum
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7
SERVICE MANUAL
SPECIFICATIONS, cont’d.
Exploded Views
R
B
A
C
G
I
J
Fig. 4 - Exploded front view
B
D
E
N
P
F
Q
S
I
H
O
K
K
L
H
M
NOR000724A
No. Description
A Hinges
B Trim Piece / Foam Tape Assembly
C Ice Cube Tray
D Freezer Wire Shelf
E User Interface Assembly (Control Assembly)
F User Interface Housing (Control Housing)
G Short Wire Shelf
H Full Wire Shelf
I Cut Out Wire Shelf
Polar Series N7V, N7X, N7XL / N8V, N8X, N8XL
J Shelf Tray
K Crisper Cover / Glass Shelf
L Crisper
M Ice Bin
N Hinge Hole Cover
O LED Assembly
P Strike Plate
Q Thermistor
R Top Trim Piece
S Bottom Trim Piece
8
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SPECIFICATIONS - Exploded Views, cont’d.
AF
U
T
AE
AC
AD
AA
AB
Fig. 5 - Exploded rear view
No. Description
T Cooling Unit
U Fins
V AC Heater
W Gas Train Assembly
X Gas Train Support Bracket / Burner Door Assembly
Y Drip Cup
Z DC Board Assembly (3-way models only)
AA Red Input Wire (3-way models only)
AB Black Input Wire (3-way models only)
AC Communication Harness (3-way models only)
AD AC Power Cord
AE Main Control Board Assembly (Power Board Assembly)
AF Fan
V
W
X
Y
Z
NOR000725A
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9
SERVICE MANUAL
WARNING
AVERTISSEMENT
ADVERTENCIA
DANGER
WARNING
GENERAL INFORMATION
To conrm that installation is adequate, check for:
■ Adequate ventilation - refer to "Ventilation Requirements" in the
refrigerator Installation Manual.
■ Both gas and electrical components installed and operating in a
safe condition.
■ Adequate seal between refrigerator mounting ange and cut-out
opening.
■ Installed on a solid oor (not on carpet) and secured.
This refrigerator is not intended to be
!
ATTENTION
operated as a free standing unit (i.e.
where the products of combustion are not
completely isolated from the living area) or
installed in such a way as to conict with
these installation instructions. Unapproved
installations could result in safety risks or
performance problems.
Ventilation
Overview
The installed unit must
!
!
!
!
ATTENTION
ATTENTION
ATTENTION
ATTENTION
Certied installation needs one lower intake vent and one upper
exhaust vent. Install the vents through the side wall of the vehicle
exactly as instructed in the Installation Manual. Any other installa-
tion method voids both the certication and the factory warranty of
the refrigerator.
The bottom of the opening for the lower intake vent, which is also
the service access door, must be even with or immediately below
the oor level. This allows any leaking propane gas to escape to
the outside and not to collect at oor level.
American Gas Association/Canadian Gas Association (AGA/CGA)
certication allows the refrigerator to have zero (0) inch minimum
clearance at the sides, rear, top, and bottom. While there are no
maximum clearances specied for certication, the following maxi-
mum clearances are necessary for correct refrigeration:
Bottom 0 inch min. 0 inch max.
Each Side 0 inch min. 1/4 inch max.
Top 0 inch min. 1/4 inch max.
Rear 0 inch min. 1 inch max.
isolated from the combustion system of the
refrigerator and it must have complete and
unrestricted ventilation of the ue exhaust
which, in gas mode, can produce carbon
monoxide. The breathing of carbon monoxide fumes can cause dizziness, nausea, or
in extreme cases, death.
be completely
Enclosure
The cabinet that encloses the refrigerator is built by the RV manufacturer. Depending on cabinet depth, height, and width certain
bafes may be present when cabinet clearances exceed installation guidelines and specications.
Bafes
Bafes prevent hot air buildup “pocketing” between the refrigerator
cabinet and the enclosure walls and/or ceiling. An enclosure may
be tted with:
■ An absorber bafe and a condenser bafe
■ Side bafes (Fig. 6, A)
■ Vertical top bafe (Fig. 6, B)
■ Vertical angled bafes
■ Box bafe
■ Or a combination of any of the above
For complete detail about any necessary bafe(s), refer to the
refrigerator Installation Manual.
Lower Intake Vent
Ventilation and combustion air ow through the lower intake vent
(Fig. 6, C), which also serves as the service access or door. The
lower intake vent needs be kept clear of obstructions that may
restrict the ow of fresh air into the enclosure.
Exhaust Vent
Warm air and combustion gases ow out of the enclosure through
the exhaust vent. The exhaust vent can be either a roof exhaust
vent (Fig. 6, D) or an upper sidewall exhaust vent.
The roof exhaust vent has a non-removable metal mesh screen
to prevent leaves, birds, rodents and/or debris from entering the
enclosure.
Roof Cap
The roof cap (Fig. 6, E) ts over exhaust vent. The sloped end
always faces the front of the RV. It is held in place by four (4) 2-1/2”
long Phillips head screws.
These clearances plus the lower and upper vents cause the natural
air draft that is necessary for good refrigeration.
Cooler air goes in through the lower intake vent, goes around the
refrigerator coils where it removes the excess heat from the refrigerator components, and goes out through the upper exhaust vent.
If this air ow is blocked or decreased, the refrigerator may not cool
correctly.
Each NORCOLD model is certied by AGA and CGA for correct
ventilation.
Polar Series N7V, N7X, N7XL / N8V, N8X, N8XL
10
www.norcold.com
WARNING
WARNING
WARNING
GENERAL INFORMATION - Roof Cap, cont’d.
E
D
B
Front of RV
■ To avoid possible propane gas leaks, always use two wrenches
to tighten or loosen the propane gas supply line connections.
■ Leaking propane gas can ignite or explode and result in danger-
ous personal injury or death.
Do not allow the leak detecting solution
!
ATTENTION
to touch the electrical components. Many
liquids are electrically conductive and can
cause a shock hazard, electrical shorts,
and in some cases re.
Leak Test-Detergent
Using a solution of liquid detergent and water:
■ Examine the propane gas supply system for leaks: make sure
the propane gas supply line and all gas connections have no
leaks. Do not use any liquid that contains ammonia.
Electrical Connections
A
C
NOR000843A
Fig. 6 - Typical roof exhaust venting
A Side Baffles
B Vertical Top Baffles
C Lower Inake Vent
D Roof Exhaust Vent
E Roof Cap
Propane Gas Connections
The refrigerator operates on propane gas at a pressure of 10.5
inches Water Column min. to 11.5 inches Water Column max.
!
ATTENTION
■ Do not smoke, or use an open ame near the propane gas
system.
■ Do not use an open ame to examine for leaks.
■ Do not connect the refrigerator to the propane gas tank without
a pressure regulator between them.
Be very careful when working on or near
the propane gas system.
120 Volts AC Electrical Connection
The refrigerator is equipped with a three-prong plug for protection
against shock hazard and must be connected into a recognized
three-prong attachment receptacle. The cord must be routed so as
not to come in contact with the burner cover, ue pipe or any other
component that could damage the cord insulation.
Do not remove (cut) grounding plug from
!
ATTENTION
■ Verify AC power cord is in a grounded three-prong receptacle.
■ Verify receptacle is within easy reach of the lower intake vent.
■ Verify power cord does not touch the burner cover, the ue
pipe, or any hot component that could damage the insulation of
the power cord.
the refrigerator AC power cord. Removal
of this prong can result in a severe electrical shock, as well as voiding the refrigera-
tor’s electrical certication and warranty.
12 Volts DC Electrical Connection
The refrigerator controls require 12 volt DC to operate. The minimum control voltage is 10.5 volts DC. The maximum control voltage is 16.0 volts DC.
Polarity
The correct polarity of the DC leads to the main control board
(power board) connections is:
■ The 12 volt DC (positive) supply wire from the battery must be
connected to the terminal marked “12 VDC” of the main control
board (power board). On 3-way models, this connection is made
to the DC control board terminal marked “12 VDC” .
■ The 12 volt DC (ground) supply wire from the battery must be
connected to the terminal marked “GND” of the main control
board (power board). On 3-way models, this connection is made
to the DC control board terminal marked “GND”.
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11
SERVICE MANUAL
GENERAL INFORMATION - Electrical Connections, cont’d.
NOTICE
12 Volt DC Fan
Main Control Board (Power Board) Fuses
There are three (3) fuses located on the main control board (power
board). Two (2) are MINI ® Blade, Automotive Style Fuses used to
protect DC voltage circuits (F1 and F2) and one (1) is a glass body
cartridge style fuse (F3) used to protect AC voltage circuits.
Fuse F1
This is a DCV, 5-Amp, 32V, MINI ® Blade, Automotive Style Fuse.
It is used to protect the DC circuitry / componentry located on the
Main Control Board (Power Board).
Fuse F2
This is a DCV, 7.5-Amp, 32V, MINI ® Blade, Automotive Style
Fuse. It is used to protect DC “loads” connected to the auxiliary
output of the main control board (power board).
Examples of these loads are: External cooling fan, waterline heaters, etc.
Fuse F3
This is an ACV, 8-Amp, 250V, Glass Body Cartridge, FST 5x20mm,
Automotive Style Fuse. It is used to protect the AC circuitry / componentry located on the main control board (power board).
F3 F1
F2
A 12 volt DC fan (Fig. 8, A) increases ventilation of the cooling
system. The fan is located near the condenser on the rear of the
cooling system foam plug. Fan resistance through the fan motor
circuit is approximately 1.8 ohms.
The fan is unidirectional and is controlled by a thermostatic switch
(Fig. 8, B).
The thermostatic switch is located on the rst condenser n (Fig. 8,
C).
The switch turns the fan on and off. The fan comes on when the
temperature of the rst condenser n is about 130° F (54.4° C) and
turn off at about 115° F (46°C).
The DC power is supplied by an auxiliary wire harness (Fig. 8, D)
through to connector pins P1-1 (Fig. 8, E) and P1-6 (Fig. 8, F).
If the vehicle has a roof exhaust vent,
you may need to remove the refrigerator
from the enclosure to test the thermostatic switch. If the vehicle has an upper
side-wall exhaust vent, you can test the
thermostatic switch by removing the upper
sidewall vent.
Low Ambient Heater (optional)
Some models are factory equipped with a low ambient heater.
NOR000815A
Fig. 7 - Fuse locations
Electrical Components
Interior Light
The interior light is located in the top of fresh food compartment.
The light remains on at all times while the refrigerator is ON.
Divider Heater
This heater is controlled by a thermostat. The thermostat allows DC
voltage to the heater only while the refrigerator is turned ON and
only when the ambient temperature is low enough.
B
C
11 10 9
1213141516
P1
5438
1
6
7
2
F E
A
D
NOR000793A
The divider heater is permanently “foamed into” the divider between the freezer compartment and the fresh food compartment.
The divider heater warms this area to prevent condensation from
forming. Powering on the refrigerator automatically powers on the
divider heater. Power to the heater is continuously supplied by the
main control board (power board).
Polar Series N7V, N7X, N7XL / N8V, N8X, N8XL
Fig. 8 - Fan wiring
A Fan
B Thermostatic Switch
C Condenser
D Auxiliary Wire Harness
E P1-1 Auxiliary 12 VDC (ground)
F P1-6 Auxiliary 12 VDC (positive)
12
www.norcold.com
NOTICE
WARNING
GENERAL INFORMATION - Electrical Components, cont’d.
Temperature Control System
Although the refrigerator is not frost-free, it is made to limit frost on
the cooling ns. At regular intervals, the temperature control system
automatically melts most of the frost from the cooling ns. The water from the cooling ns drains into a collection cup attached to the
back of the refrigerator. The heat of the cooling system evaporates
the water from the collection cup.
Backup Operating System
This refrigerator has a backup operating system. The backup
operating system allows the refrigerator to continue to cool if the
thermistor of the refrigerator should fail.
If a failure occurs:
■ The refrigerator automatically changes to the backup operating
system.
■ N7V and N8V models:
• In Auto AC mode, the green power ON / indicator light will
ash OFF once every 20 seconds and repeat until the
thermistor is sensed to be operating correctly.
• In Auto Propane Gas mode, the amber power ON / indicator
light will ash OFF once every 20 seconds and repeat until
the thermistor is sensed to be operating correctly.
PREVENTATIVE MAINTENANCE
An annual maintenance check is strongly recommended:
■ Leak test the gas lines.
■ Check combustion seal; repair or replace, if necessary (visual
check without removing the refrigerator).
■ Inspect or clean the openings of the burner tube.
■ Check/adjust the spark electrode gap to 1/8 - 3/16 inch.
■ Make sure the spark electrode tip is clean and the spark elec-
trode is securely attached to the gas train assembly.
■ Check/adjust AC and DC voltages and propane gas supply
pressure.
■ Make sure that area around the burner and controls is free of
debris, oily rags, etc.
■ Inspect the controls, piping and wiring to insure that they are in
good condition.
THESE MAINTENANCE PROCEDURES
MUST BE PERFORMED BY A QUALIFIED SERVICE PERSON.
NORCOLD CANNOT ACCEPT RESPONSIBILITY FOR REPAIRS, ADJUSTMENT,
OR MAINTENANCE PERFORMED BY
OTHER THAN A QUALIFIED DEALER
OR SERVICE CENTER.
■ N7X and N8X models:
• In ANY mode, the temperature setting will ash ON and
OFF for 10 seconds when the control is “awake”.
■ N7LX and N8LX models:
• In ANY mode, the temperature setting will ash ON and
OFF for 10 seconds when the control is “awake”.
■ The backup operating system can over-freeze or thaw the con-
tents of the freezer and the fresh food compartment.
■ Make sure the temperatures of the freezer and the fresh
food compartment are satisfactory.
Gas Flame Appearance
While in propane gas operation, examine the appearance of the
gas ame:
1. Change the refrigerator controls to the coldest temperature
setting.
2. Open the lower intake vent.
!
ATTENTION
3. Open the burner door and look at the gas ame:
■ The ame should be a darker blue inside and a lighter blue
outside and should be a constant and steady shape.
■ The ame should not be yellow and should not have an er-
ratic and unstable shape.
■ Make sure the ame does not touch the inside of the ue
tube.
4. Close the burner door.
5. Clean the openings of the burner tube as part of routine
maintenance. Follow the instructions in the “Clean the
Openings of the Burner Tube’ section of these instructions.
If the ame is not at peak performance, after the openings of
the burner tube are cleaned, contact Customer Service.
The burner door can be hot. Wear gloves
to avoid burns.
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13
SERVICE MANUAL
WARNING
WARNING
WARNING
PREVENTIVE MAINTENANCE, cont’d.
Clean the Openings of the Burner Tube
Clean the openings of the burner tube annually. To clean:
1. Close the valve at the vehicle propane gas tank(s).
2. Touch and hold the ON/OFF button ( ) for one (1) second
to turn the refrigerator off.
3. Open the lower intake vent.
4. Disconnect the two (2) white wires from the gas train assembly (Fig. 9, A).
!
ATTENTION
5. Disconnect the gas supply line from the gas train assembly.
6. Remove the two (2) screws (Fig. 9, B) that attach the gas
train support bracket/door assembly (Fig. 9, C) to the cooling unit.
!
ATTENTION
7. Remove the gas train assembly from the cooling unit.
To avoid possible propane gas leaks,
always use two (2) wrenches to loosen
and tighten the gas supply line at the gas
train assembly.
Never attempt to operate the gas train
when it is NOT installed in the cooling unit
because of the risk of electrical shock.
NOR000683A-1
B
C
Fig. 9 - Burner tube location
A Gas Train Assembly
B Screws
C Gas Train Support Bracket/Door Assembly
Air
A
When cleaning, do not try to remove
!
ATTENTION
8. Clean the openings of the burner tube with compressed air
only. Blow air into the openings of the burner tube.
9. Put the gas train assembly back onto the cooling unit.
10. Attach the gas train support bracket/door assembly to the
cooling unit.
11. Connect the gas supply line to the gas train assembly.
12. Connect the two (2) white wires to the gas valve of the gas
train assembly.
13. Open the valve at the vehicle propane gas tank(s).
14. Examine all of the gas connections for leaks. Refer to the
“Conduct Leak Test” procedure.
the burner. Removal may can cause a
propane gas leak. Leaking propane gas
can ignite or explode and result in dangerous personal injury or death. Do not try to
clean the burner with anything other than
compressed air.
NOR000683A
Air
Air
Air
Fig. 10 - Openings of the burner tube
Polar Series N7V, N7X, N7XL / N8V, N8X, N8XL
14
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WARNING
USER INTERFACE (CONTROLS) - N7V AND N8V MODELS
change temp setting.
if red
check
NORCOLD
NOR000647A
A B
Fig. 11 - N7V and N8V user interface (control) locations
No. Description
A Power ON / OFF button
B Power ON / Indicator Light
Power ON / OFF Button
Touch the Power ON / OFF button (See Fig. 11, A) to turn on the
refrigerator.
Touch and hold the Power ON / OFF button for one (1) second to
turn off the refrigerator.
Modes of Operation
A precise heat is applied to the boiler area of the cooling unit causing a chemical reaction within the cooling unit that ultimately results
in the refrigerator cooling. The heat is applied by means of:
■ A 120 volt AC heater positioned in a heater well welded to the
surface of the boiler. AC operation requires 108 to 132 volts AC.
To replace the heater, the refrigerator must be removed from the
enclosure.
gas
These heat sources are turned on/off via a factory preset Auto
mode. The unit will attempt to operate the heat source requirements in the following order of priority:
■ 1st Priority Choice - Auto Mode
While in the Auto Mode, the AC cartridge heater is operated to
provide heat to the boiler area of the cooling unit and the power
ON / indicator light (See Fig. 11, B) is solid GREEN.
■ 2nd Priority Choice - Propane Gas Mode
While in the Propane Gas Mode, the propane gas burner is operated to provide heat to the boiler area of the cooling unit and
the power ON / indicator light is solid AMBER.
■ Touch and hold the Power ON / OFF button for between 20-23
seconds to change the mode between Auto Mode and Manual
Propane Gas Mode (See Fig. 12).
■ If the refrigerator is operating in Auto Mode, touch and hold
the ON / OFF button. The green power ON indicator light
will go out. Continue to hold the Power ON / OFF button
for between 20-23 seconds. When the power ON indicator
light comes on solid AMBER, release the Power ON / OFF
button. The refrigerator is now operating in Manual Propane
Gas Mode.
■ If the refrigerator is operating in Manual Propane Gas Mode,
touch and hold the ON / OFF button. The amber power ON
indicator light will go out. Continue to hold the Power ON /
OFF button for between 20-23 seconds. When the power
ON indicator light comes on solid GREEN, release the
Power ON / OFF button. The refrigerator is now operating in
Auto Mode.
■ If the power ON / indicator light is solid RED, there is a problem
and the refrigerator is not cooling. Refer to “Fault Codes N7V
and N8V Models” section.
Burn hazard! Allow canister and heaters
!
ATTENTION
■ A propane gas burner positioned below the boiler such that the
heat from the flame is directed across the surface of the boiler.
The controls energize the solenoid coil to open the gas valve.
Spring pressure closes the valve when the controls stop the flow
of current to the solenoid coil. The controls use an electronic
sparker to ignite the propane gas at the burner.
to cool before attempting to remove and
replace.
Touch and hold.
Green Amber Amber flashing
ON
OFF
Seconds 0 1 through 20 21 22 23 through
Fig. 12 - Change mode and temperature setting
Release here to
change mode.
Release here to
NOR000795A
30 31 32
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15
SERVICE MANUAL
NOTICE
USER INTERFACE (Controls) - N7V and N8V Models, cont’d.
A thermistor is mounted on the n assembly located inside the
fresh food compartment. The thermistor acts as a temperature sensor, reporting the temperature sensed to main control board (power
board) which turns on/off the appropriate heat source accordingly.
The user interface (controls), main control board assembly (power
board assemlby), thermistor, and other components within the
refrigerator are interconnected via a wire harness.
While the Power On indicator light is ashing, touch and release
the Power ON button to change to each of the three (3)temperature
settings, one at a time.
When the desired temperature setting is shown, touch and hold
the Power On button for ten (10) seconds to exit the temperature
setting mode. The Power ON / indicator light will stop ashing and
return to the solid GREEN or AMBER.
Air in the Propane Gas Supply Lines
For safety reasons, the refrigerator electronic controls are designed so that while
operating in Propane Gas Mode, the trial
for ignition (the maximum time that the
gas valve and the igniter can be left on
without a ame present) is limited to 30
seconds. When starting the refrigerator for
the rst time, after storage, or after replac-
ing the propane gas tanks(s), the propane
gas supply lines can have air in them.
Due to the air in the gas supply lines, the
burner may not ignite within the 30 second
time limit. If this happens, the gas valve
and igniter outputs will be turned off, the
propane gas mode will be “locked out,”
and the appropriate fault code will show in
the display.
The gas lock out condition can be reset
by powering the refrigerator OFF and
back ON, at which time a new 30 second
trial for ignition will begin. You may need
to repeat this procedure several times to
remove all of the air from the gas supply
lines.
Refrigerator Temperature Settings
Diagnostic Prechecks
Diagnosing fault codes begins by starting with the basics. In many
cases, the problem can be solved by verifying the unit is operating
in acceptable conditions:
■ The refrigerator is plugged into a known working AC outlet
with a voltage between 108VAC and 132VAC
■ Extension cords are not being used to supply AC power to
the refrigerator
■ The refrigerator is connected to a known working DC power
supply and/or battery supplying between 10.5 and 16.0
VDC
■ Propane gas is available to the refrigerator and is regulated
between 10.5 and 11.5” WC (Inches of Water Column).
The user interface (controls) has three (3) temperature settings.
The temperature setting can be changed within the temperature set
mode of the user interface (controls). To enter the temperature set
mode (See Fig. 12):
■ Touch and hold the ON / OFF button. The power ON indica-
tor light will go out. Continue to hold the Power ON / OFF
button. The power ON indicator light will come on after 20
seconds and go off again after 23 seconds. Continue to
hold the Power ON / OFF button. The power ON indicator
light will come on again after 30 seconds. Release Power
ON / OFF button.
The color of the power ON indicator light shows the current temperature setting of the refrigerator:
■ Green shows the COLD temperature setting.
■ Amber shows the COLDER temperature setting.
■ Red shows the COLDEST temperature setting.
Touch and release the Power ON button and the Power ON / indi-
cator light will ash on and off, which indicates that the temperature
setting can be changed.
Polar Series N7V, N7X, N7XL / N8V, N8X, N8XL
16
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FAULT CODES - N7V AND N8V MODELS
NOR000123A
NOTICE
Fault Code Flash Patterns - N7V and N8V
Models
The user interface (controls) has the ability to recognize various
fault conditions and will display a unique error/fault code accordingly.
Should none of the heat source inputs be available, the power ON/
indicator light (See Fig. 12) will be solid RED.
ALL other fault codes will be displayed using ash patterns. The
term “ash pattern” means the power ON / indicator light is turned
ON and OFF to create a numeric pattern. These ash patterns di-
rectly correspond to particular fault codes. For example, fault code
3 will be indicated by ashing the power ON / indicator light RED
3-times, followed by a 5-second pause, and then repeated as long
as the fault condition is present (See Fig. 13).
Fault Code Flash Pattern Fault Code Meaning Action to Take
The refrigerator is not cooling if the power
ON / indicator light is either on solid RED
or ashes on RED.
NOROOO6123A
Fig. 13 - Example fault code ash pattern
NORCOLD
NORCOLD
NOR000647-
NORCOLD
NORCOLD
NORCOLD
NORCOLD
NORCOLD
NORCOLD
NORCOLD
Flash Pattern Appears Here
Red, on solid.
Red, flashes on one (1) time,
is off five (5) seconds, repeats.
Red, flashes on two (2) times,
is off five (5) seconds, repeats.
Red, flashes on three (3) times,
is off five (5) seconds, repeats.
Red, flashes on four (4) times,
is off five (5) seconds, repeats.
Red, flashes on five (5) times,
is off five (5) seconds, repeats.
Red, flashes on eight (8) times,
is off five (5) seconds, repeats.
Red, flashes on nine (9) times,
is off five (5) seconds, repeats.
The refrigerator tried to operate on the selected energy
source(s) with no success.
Refer to ”Fault - Code - Solid Red Indicator Light” on page 18.
AC heater fault. Refer to “Fault Code - Flash Pattern 1”
on page 20.
Internal control fault. Refer to “Fault Code - Flash Pattern 2”
on page 21.
Internal control fault. Refer to “Fault Code - Flash Pattern 3”
on page 21.
The AC heater relay stuck on. Refer to “Fault Code - Flash Pattern 4”
on page 21.
A flame is sensed at the burner when there should be
none present.
Refer to “Fault Code - Flash Pattern 5”
on page 22.
The DC input voltage to the refrigerator is too low. Refer to “Fault Code - Flash Pattern 8”
on page 22.
The DC input voltage to the refrigerator is too high. Refer to “Fault Code - Flash Pattern 9”
on page 22.
www.norcold.com
NORCOLD
NORCOLD
NORCOLD
NORCOLD
Red, flashes on ten (10) times,
is off five (5) seconds, repeats.
Green, flashes off once every
twenty seconds.
Amber, flashes off once every
twenty seconds.
Communications between the controls have been lost. Refer to “Fault Code - Flash Pattern 10”
on page 23.
The refrigerator is operating on AC electric power. The
thermistor has been sensed as inoperable, so the tem-
Refer to “Fault Code - Thermistor Fault”
on page 24
perature is being controlled via backup operating system.
The refrigerator is operating on propane gas. The thermistor has been sensed as inoperable, so the temperature
Refer to “Fault Code - Thermistor Fault”
on page 24.
is being controlled via a backup operating system.
The refrigerator is OFF. Refer to “Blank Display” on page 25.
17
SERVICE MANUAL
TROUBLESHOOTING FLOWCHARTS - N7V AND N8V MODELS
Fault - Code - Solid Red Indicator Light
Plugged
into working AC
outlet with min.
85 VAC?
YES
AC power
cord in good
working
condition?
YES
Is
8A fuse on
main control
board assy
(pwr board)
intact?
YES
NO
NO
NO
Correct AC outlet.
Replace AC power cord.
Replace fuse.
NORCOLD
Red, on solid.
Possible Cause:
120 VAC power is not available. Refrigerator defaulted to propane gas opera-
tion, but did not establish a ame.(Gas
Lockout).
Turn the refrigerator OFF and then back
ON to reset.
Are all
propane gas
valves open and
supply free of
air?
NO
YES
Is burner clean?
NO
YES
Is burner/
electrode gap
1/8”-3/16”?
NO
YES
Continued on following page.
Correct.
Clean burner.
Correct gap.
NOR000707A
Polar Series N7V, N7X, N7XL / N8V, N8X, N8XL
18
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