Norcold DC-0740S Installation instructions

DC REFRIGERATORS
12/24 VOLTS
INSTALLATION AND OWNER’S
MANUAL
Service Information
Ifserviceorpartsarerequired,contactthenearestNorcoldServiceCenter. Tofindan
authorizedNorcoldServiceCenternearyou,please telephone the NorcoldCustomer
Support Dept. at 800-543-1219 (option-1) or visit our web site at www.norcold.com.
Norcold Customer Support Dept.
Telephone : [phone]
Fax : [phone]
Web Site: www.norcold.com
ModelNo. Serial No.
Printed in Taiwan
6/06
Part No. 622034E

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NORCOLD AC/DC Models - Two Year Limited Warranty Policy
Norcold,Inc. warrantsthat when properlyinstalled and placedundernormal service and
useitsrefrigeration equipment is freefromdefects inmaterialand workmanship for two
years commencing from the original date of purchase of the new equipment.
Limitations of Warranty
1. This Warranty is the only warranty for a NorcoldAC/DC refrigerator. This Warranty
doesnot extend toglassware,electric light bulbs,andreplaceable fuses.
2. This warranty does not apply to parts and assemblies that have been subjected to
misuse,improper installation,abnormalservice, transit damage,rechargingof cooling
system,accident, fire, improperrepair, tamperingorabuse.
3. Irrespective of the nature of the warranty protection offered or claimed, the period of
warranty shall inno case extendbeyond two yearscommencing from theoriginal date
of purchase of the new equipment.
Limitation of Remedy
1.The responsibility of NORCOLD underthisorany warranty is limited to the repairor
replacement(at NORCOLD’S option) of thedefectivepartor assembly.
2. In no event and under no circumstances shall NORCOLD be responsible under this
LimitedWarrantyforanyother charge whatsoever, including but not limitedtocharges
orclaimsforlabor,lost business, lost time, lost profits,loss of use, or any kind of
incidentalor consequentialdamages, however denominated ordescribed. Theremedy
underthis warranty islimitedto repairor replacement.
3. Somestates do notallowthe exclusion or limitationof incidentalor consequential
damages,so the above exclusion may notapplyto you.
Disclaimer of Other Warranties
This Warranty isexpressly in lieu ofall other warranties eitherexpressed or implied. All
otherwarranties, expressed orimplied, including anywarranty of merchantabilityorfitness
fora particularpurpose, arehereby disclaimed and excluded.
Legal Rights
ThisWarrantygivesyou specific legal rights,and you mayhaveother legal rightswhich
varyfrom stateto state.

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Safety Awareness
Readthis manual carefully andunderstand thecontentsbefore youinstall therefrigerator.
Beaware of possible safety hazards whenyousee the safety alert symbol on the
refrigeratorand in this manual. Asignalword follows the safetyalertsymbol and identifies
thedanger of the hazard. Carefully read the descriptions ofthesesignal words to fully
knowtheir meanings. They are for your safety.
WARNING: This signal word means a hazard, which if ignored, can cause
dangerouspersonal injury,death, or much propertydamage.
CAUTION: This signal word means a hazard, which if ignored, can cause small
personalinjury or much property damage.
Model No. and Serial No.
The model and serial number are on a label which is inside the refrigerator on the left
side and on the cover of this manual.
Operation
Thisrefrigeratoris made for refrigerating purposes and operates on a 12/24 volt DC
powersupply when installedas written inthismanual.
CAUTION: Neverstore combustible materials near therefrigerator. Storing
combustiblematerials near therefrigerator creates asafety hazard andalso
decreasesthe ventilation ofthe cooling systemwhichdecreases the refrigerator
performance.
Donottouchtheevaporatororothermetalpartsinside the refrigerator cabinet with
wethands because they can freezetothe refrigerator.
Alwaysdisconnect all power sources from therefrigeratorwhen doing routine
maintenance.Have service workdone only byaqualified servicetechnician.
Therefrigerator temperature is controlled byathermostat, locatedonthe panelabove the
door. Agreen power light, located on the panel comes on when the refrigerator is “ON”.
Number “1” is the warmest and number “5” is the coldest thermostat position. For
efficient operation, change the thermostat according to the types of food stored and the
ambienttemperature.
If you are not going to use the refrigerator for an extended period of time, put the thermo-
stat to the “OFF” position.

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Over Heating Shut-off Device Operation
Operating the refrigerator in high ambient temperatures can over heat the cooling unit and
causepremature failure ofthecompressor.(Seethe label inside therefrigerator.)
Toprotect the coolingunit fromover heating,therefrigerator willautomatically shut-offwhen
the vehicle air temperature is higher than approximately 130° F. If shut off occurs, an
audible alarm tone (an intermittent beeping) operates from the refrigerator.
Tostop the audiblealarmtone and restarttherefrigerator,turn the thermostatcounterclock-
wisetothe“OFF”positionandthenclockwisetothedesiredthermostatposition.
The refrigerator will not restart until the air temperature is lower than approximately
130° F.
Protection System
Your refrigerator has an over current protection system in the electronic circuit to
prevent damage to the inverter which may occur due to a reverse polarity connection.
If the refrigerator does not operate and the green power light does not come on, check
the fuse, which is located on the side of the inverter case, and the polarity of the DC
power supply. If the refrigerator still does not operate, another problem can exist in
the inverter. Have an authorized Norcold Service Center check the refrigerator.
Cleaning and Defrosting
Defrosting
Itis normal for frost to collectonthe freezer plate inside the refrigerator. Excessfrost
decreasesthe cooling performance of therefrigerator. Defrost the refrigeratorasneces-
sary.
CAUTION: Do not use sharp objects, a hair dryer, a heat gun, etc. to defrost the
refrigerator. Damage to the interior of therefrigeratorcanoccur.
- Turn the thermostat to “OFF”.
- Removeallfoodfrom the refrigerator.
NOTE: Defrostingthe refrigerator makesexcesswater inside therefrigerator.
- Putdry towels (etc.) inside the refrigerator toabsorbthe excess water.

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- Put trays of hot water in the freezer until the frost is melted.
- Empty the drip tray.
- Remove the wet towels (etc.) and dry the inside of the refrigerator
- Turn the thermostat to the desired setting.
- Put the drip tray and all food in the refrigerator.
Cleaning
Agood time to clean the refrigerator is just after you defrost it.
Cleanthe inside of the refrigerator as often as necessary to avoidfoododors:
- Removeallfoodfrom the refrigerator.
NOTE: Donot use abrasive cleaners, chemicals, or scouring pads because they can
damagethe inside of therefrigerator.
- Wash the inside of the refrigerator and the door gasket with a solution of liquid dish
detergentand warm water.
- Rinse with clean water and dry.
- After cleaning, put a thin coating of petroleum jelly on the hinge side of the gasket to
keep it soft and to prevent it from rolling.
Battery Maintenance
Over cooling drains your battery
- When the ambient temperature is between 70° and 90° F, keep the thermostat at the “3“
position to avoid an excessive drain of the battery. When making ice, or storing frozen
foods, turn the thermostat to the coldest setting “5“.
Maintain the battery
Ifthe charge of your battery is notsufficient,the coolingperformanceof your refrigerator
decreases.
CAUTION: Only use a “quick charger” on the battery if the thermostat is turned to
“OFF”.

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Installation
Therefrigeratorshould be located and secured on a solid surface in the vehicle.
Beforeinstalling therefrigeratorinto the opening, make suretheDC supply is properly
connected. In many cases, the DC supply can be connected from outside the vehicle
by means of the baggage or access door.
Measurethe opening to determineifyou have proper clearancefor installation.
Additionalinsulation spacearoundtherefrigerator is notnecessary.
Check the Battery charge Level
Afullychargedbatterywill haveaspecific gravityreading of between1.260 and1.280. The
batteryvoltage isbestindicated when the refrigerator is “ON”andthe battery charging sys-
temis “OFF”. Charge the battery when the specific gravityreadingis less than 1.200.
For your reference
The wiring diagram shown below is recommended for dual battery hookup (See
Art01516).
*Recommended source:
Sure Power Industries, Inc.
1-800-845-6269
www.Surepower.com

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Be sure the refrigerator is not in direct sunlight or near a gas stove, a heater, or other
heat-generatingappliances. Avoidinstalling your refrigeratorclose to warmwaterlines
or warm air ducts.
Yourrefrigerator wasthoroughlycleaned before shipment fromthe factory.
Itis advisable, however,to clean the interior once more before using. Wipethe interior
with a cloth and warm water. Then wipe with a dry cloth.
Ventilation
Sufficient ventilation (airflow)over the rear mountedcondenserof the refrigeratoris
necessaryfor the refrigerator tooperate correctly (SeeArt01582).
* NOTE: The fan will operate only when
theambient temperature is
higherthan approximately 95° F.
CAUTION: Do not remove the
bottomrails from therefrigerator
cabinet. Therails supply space
underthe refrigerator that is neces-
saryfor correctventilation.
If you do not make sure that the
ventilationis correct,ashortened
refrigeratorlife expectancy,poor
refrigeration,continuous operation,
acceleratedbattery dischargeanda
voidwarranty willresult.
Installation Options
Install a decorative door panel
NOTE: The decorative door panel must be
4 mm or less in thickness.
1. Remove the door from the refrigerator
by removing the two (2) bolts that attach
the door hinge to the bottom of the
refrigerator(SeeArt01583).
Air inlet
Air outlet
Rails
Fan*
Art01582

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2. Removethe panelretainer by removing
the two (2) screws that attach the panel
retainer (SeeArt01511).
3. Gently pull the door panel out of the
door (Art01512).
4. Push a new door panel into the door
slot.
CAUTION: Do not overtighten the
screwsand bolts.
5. Put the panel retainer in the original
location and attach with two (2) screws.
6. Put the door in the original location and
tighten the two (2) bolts.
Reverse the door swing:
1. Remove the door from the refrigerator
by removing the two (2) bolts that attach
the door hinge to the bottom of the
refrigerator
2. Remove the two (2) bolts that attach the
upperhinge.
3. Remove the bolt that attaches the door
latch plate to the top of the refrigerator
(SeeArt01513).
4. Remove the upper hinge and the door
latchplate from therefrigerator.
5.Attach the upper hinge and the door
latch plate to the opposite sides of the
refrigerator.
Door latch plate
Bolts
Art01513

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6. Move the latch to the opposite side of
the door (SeeArt01514):
- Remove the screw that attaches the
hinge insert to the door.
- Remove the hinge insert, the latch
handle, and the coil spring from the
door.
- Pull the latch handle pin out of the
recessin the latch handle.
- Move the latch handle pin to opposite
side of the latch pin (SeeArt01515).
- Turn the latch handle upside down and
push the latch handle pin into the
recessof the latch handle.
- Make sure the angled top faces
thedoorlatch plate.
- Assemble the coil spring, the latch
handle, and the hinge insert into the
opposite side of the door.
- Install and tighten the screw that
attaches the hinge insert to the door.
7. Put the door onto the refrigerator
8. Install and tighten the two (2) screws
that attach the door hinge to the bottom
ofthe refrigerator.

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Connect the 12 volts DC supply
Thisrefrigerator operates on 12/24 voltsDCcurrentfroma battery.
CAUTION: Onlyconnect the refrigerator directly to the battery. Because they
oftengeneratehighvoltagepulsesand cause transistor defectsinthe inverter,no
otherswitches, lead wires, orelectricalequipment should share thewiring between
therefrigerator and battery.
When using either a converter or a battery charger, make sure that they are connected in
parallel between the battery andtherefrigerator. Do notusea converter or battery charger
to supply the DC power directly to the refrigerator because these two devices do not
supplyfiltered DC power (SeeArt01521).
Asthe distance fromthe vehicle battery to the refrigeratorincreases,the correctAWG wire
sizealso increases. If he wire size is toosmallfor the distance,a voltagedrop occurs.
Thevoltage dropdecreasesthe cooling performance of therefrigerator.
1. Norcold recommends that you use the following wire and fuse sizes:
- Measurethe distancefromthe vehicle battery to therefrigerator:
- If the distance is less than 12 feet, use 16AWG wire and a 10Amp fuse.
- If the distance is between 12 and 20 feet, use 14AWG wire and a 10Amp fuse.
- If the distance is more than 20 feet, use 12AWG wire and a 10Amp fuse.
Art01521
Refrigerator Refrigerator
Refrigerato
r
Refrigerator
INCORRECT INCORRECT
CORRECT CORRECT
Battery charger or
AC/DC converter etc.
Battery charger or
A
C/DC converter etc.
Transisterized
DC power supply
Transisterized
DC power supply

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- Twist the lead wires to reduce the radio interference and induction of a high
voltage surge from the outside (See Art01518).
2. Connect the DC power supply (See
Art01509):
- Remove the two (2) screws that attach
the junction cover.
- Remove the junction cover.
- Put each of the two (2) wires from the
batterythrough the ferrite core.
- Make a loop of the two (2) around and
back through the ferrite core.
- Put the two (2) wires through the
bushing of the junction cover.
- Push the DC input wires onto the DC
inputterminals.
- Refer to the positive (+) and
negative(-) markings to make sure
thattheconnectionsarecorrect.
- Attach the junction cover with the two
(2)screws.
- Put the two (2) wires through the wire
strainrelief.
- Attach the wirestrainrelief to the refrigerator cabinet withthe self-tapping screw.
Art01518
Electrical equipment
INCORRECT CORRECT
Battery Battery
Refrigerator Refrigerator
Twist lead wires

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