Dometic 620412.331 User manual

1
INSTALLATION
INSTRUCTIONS
USA
SERVICEOFFICE
DometicCorporation
2320IndustrialParkway
Elkhart,IN46515
574-294-2511
CANADA
DometicDistribution
866LangsDrive
Cambridge,Ontario
CANADAN3H2N7
519-653-4390
For Service Center
AssistanceCall:
800-544-4881
Important:TheseInstructions
must stay with unit.
Owner read carefully.
RECORDTHISUNITINFORMATIONFOR
FUTUREREFERENCE:
Model Number
Serial Number
Date Purchased
C
U
S
This manual must be read and un-
derstood before installation, ad-
justment, service, or maintenance
is performed. This unit must be in-
stalled by a qualified service tech-
nician.Modificationofthisproduct
can be extremely hazardous and
could result in personal injury or
property damage.
Lire et comprendre ce manuel avant de
procéderàl'installation,àdesréglages,
de l'entretien ou des réparations.
L'installation de cet appareil doit être
effectuée par un réparateur qualifié.
Toute modification de cet appareil peut
être extrêmement dangereuse et
entraîner des blessures ou dommages
matériels.
MODEL 6204XX
Roof-Top Air Conditioner
THIS UNIT IS DESIGNED FOR OEM INSTALLATION
ALL INITIAL INSTALLATIONS MUST BE APPROVED BY THE SALES DEPT.
Models
620412.331
620415.331
620415.336
620425.331
620425.336
620426.331
620426.336
REVISION:
FormNo.3308970.0152/05
(Replaces3308970.007)
(French3308971.013)
©2005DometicCorporation
LaGrange,IN 46761
used with one of following:
3105007 Return Air Cover
3105935 Quick Cool Return Air Cover
3308120 Genesis Air Filtration System
and
3106995 Analog Wall Thermostat

2
SAFETY INSTRUCTIONS
This manual has safety information and instruc-
tionsto helpusers eliminateor reducethe riskof
accidentsand injuries.
RECOGNIZE SAFETY INFORMATION
Thisisthesafety-alertsymbol.Whenyou see this
symbolinthis manual,bealert tothepotentialfor
personalinjury.
Follow recommended precautions and safe op-
eratinginstructions.
UNDERSTAND SIGNAL WORDS
Asignal word,WARNING ORCAUTION is used
withthesafety-alertsymbol.Theygivethelevelof
riskforpotentialinjury.
indicates a potentiallyhazard-
oussituation which, ifnotavoided, couldresultin
deathorseriousinjury.
indicates a potentially hazard-
ous situation which, if not avoided may result in
minorormoderate injury.
used without the safety alert
symbol indicates, a potentially hazardous situa-
tion which, if not avoided may result in property
damage.
Readandfollowallsafetyinformationandinstruc-
tions.
!
WARNING
!
CAUTION
CAUTION
!
A. Productfeaturesorspecificationsasdescribedorillustrated
are subject to change without notice.
B. This Air Conditioner Is Designed For:
1. Installationonarecreationalvehicleduringthetime
thevehicleismanufactured.
2. Mountingontheroofofarecreationalvehicle.
3. Roof construction with rafters/joists on minimum of 16
inch centers.
4. Minimum of 2.00 inches and maximum of 5.50 inches
distancebetweenrooftoceilingofrecreationalvehicle.
Alternate installation methods will allow for roofs more
than 5.50 inches thick.
C. The ability of the air conditioner to maintain the desired
insidetemperature depends ontheheat gain oftheRV.
Somepreventativemeasurestakenbytheoccupantsofthe
RVcanreducetheheatgainandimprovetheperformanceof
theairconditioner. Duringextremelyhighoutdoortempera-
tures, the heat gain of the vehicle may be reduced by:
1. Parking the RV in a shaded area
2. Usingwindowshades(blindsand/orcurtains)
3. Keepingwindows and doors shut orminimizingusage
4. Avoidingtheuseofheatproducingappliances
Operation on High Fan/Cooling mode will give optimum or
maximum efficiency in high humidity or high outside tempera-
tures.
Starting the air conditioner early in the morning and giving it a
"head start" on the expected high outdoor ambient will greatly
improveitsabilityto maintain thedesiredindoortemperature.
Foramorepermanentsolutiontohighheatgain,accessorieslike
A&Eoutdoorpatioandwindowawningswillreduceheatgainby
removing the direct sun. They also add a nice area to enjoy
companyduringthecooloftheevening.
D. Condensation
Note: Themanufacturerofthisairconditionerwillnotberespon-
siblefor damage caused bycondensedmoisture on ceilingsor
othersurfaces. Aircontainsmoistureandthismoisturetendsto
condenseoncoldsurfaces.WhenairenterstheRV,condensed
moisturemay appearon the ceiling,windows, metal parts,etc.
The air conditioner removes this moisture from the air during
normaloperation.Keepingdoorsandwindowsclosedwhenthis
airconditionerisinoperationwillminimizecondensedmoisture
oncold surfaces.
GENERAL INFORMATION
620412, 620415, 620425 & 620426 Series Installation Instructions

3
620412, 620415, 620425 & 620426 Series Installation Instructions
620412.331 11,000 1530 9.5 53.0 3.5 10.0 335/250 .012/0.65 17.0 20Amp 95 2.5KW/4.0KW
620415.331 13,500 1530 12.4 60.0 3.5 10.0 335/250 .012/0.65 15.2 20Amp 95 3.5KW/5.0KW
620415.336 13,500 1530 12.4 60.0 3.5 10.0 335/250 .012/0.65 15.2 20Amp 95 3.5KW/5.0KW
620425.331 13,500 12.4 60.0 3.5 10.0 335/250 .012/0.65 15.2 20 Amp 95 3.5KW/5.0KW
620415.336 13,500 12.4 60.0 3.5 10.0 335/250 .012/0.65 15.2 20 Amp 95 3.5KW/5.0KW
620426.331 15,000 12.0 64.0 3.3 8.2 380/250 .012/0.65 20.0 20Amp 95 3.5KW/5.0KW
620426.336 15,000 12.0 64.0 3.3 8.2 380/250 .012/0.65 20.0 20Amp 95 3.5KW/5.0KW
SPECIFICATIONS
* For wire length over 24 ft., consult the National Electric Code for proper sizing.
** DometicCorporationgivesGENERALguidelinesforgenerator requirements.Theseguidelinescomefromexperiencespeoplehavehadinactualapplications.
When sizing the generator, the total power usage of your recreational vehicle must be considered. Keep in mind generators lose power at high altitudes
and from lackof maintenance.
*** CIRCUITPROTECTION:TimeDelayFuseorHACRCircuitBreakersRequired.
Model
No. Nominal
Capacity
(BTU/HR)
Cooling
Electrical
Rating
Amps
Heater
Watts Compressor
Rated
Load
Amps
Compressor
Locked
Rotor
Amps
Fan Motor
Locked
Rotor
Amps
Fan Motor
Rated
Load
Amps
SCFM-High
Speed
Max./Min.
W.C.
Total
Static
Max./Min.
Refrigerant
R-22
(Oz.)
Minimum
Wire Size* AC Circuit
Protection
** User
Supplied
Installed
Weight
(Pounds)
Minimun
Generator
Size**
1Unit/2Units
120VAC
60Hz.
1Phase
12AWG
Copper
Up To 24'

4
A. Precautions
Improperinstallationmaydamage equipment,
could endanger life, cause serious injury and/
or property damage.
1. ReadInstallation and Operating Instructions care-
fully before attempting to start your air conditioner
installation.
2. DometicCorporationwillnotbeliableforanydam-
ages or injury incurred due to failure in following
these instructions.
3. InstallationmustcomplywiththeNationalElectrical
Code ANSI/NFPA-70 and CSA Standard C22.1
(latest edition and any State or Local Codes or
regulations.
4. DONOT addanydevicesoraccessoriestothisair
conditionerexceptthosespecificallyauthorizedby
Dometic.
5. This equipment must be serviced by qualified per-
sonnelandsomestatesrequirethesepeopletobe
licensed.
B. Choosing Proper Location For The Air
Conditioner
Thisairconditionerisspecificallydesignedforinstallationon
theroofofarecreationalvehicle(RV).Whendeterminingyour
coolingrequirements,thefollowingshouldbeconsidered:
•Size of RV;
•Windowarea(increasesheatgain);
•Amountof insulation inwalls and roof;
•GeographicallocationwheretheRVwillbeused;
•Personalcomfortlevelrequired.
1. NormalLocation-Theairconditionerisdesignedto
fitoveranexistingroofventopening.
INSTALLATION INSTRUCTIONS
FIG. 1
620412, 620415, 620425 & 620426 Series Installation Instructions
2. Other Locations-When no roof vent is available or
anotherlocationisdesired,thefollowingis recom-
mended:
a. For one unit installation: The air conditioner
should be mounted slightly forward of center
(front to back) and centered from side to side.
b. Fortwounitinstallations:InstalloneAirCondi-
tioner 1/3 and one Air Conditioner 2/3’s from
front of RV and centered from side to side.
1/2L LL
1/3L
2/3L
FIG. 2
Itispreferredthattheairconditionerbeinstalledon
a relatively flat and level roof section measured
withthe RV parkedon a levelsurface.
Note:A8°slanttoeitherside,orfronttoback,isacceptable
for all units.
3. AfterLocation Has Been Selected:
a. Check for obstructions in the area where air
conditioner will be installed. See FIG. 4.
b. The roof must be designed to support 130
pounds when the RV is in motion. Normally a
200lb.staticloaddesignwillmeetthisrequire-
ment.
CAUTION
CAUTION
It is the responsibility of the installer of this
air conditioner system to ensure structural in-
tegrity of the RV roof. Never create a low spot
on the roof where water will collect. Water
standing around the air conditioner may leak
into the interior causing damage to the prod-
uct and the RV.
c. Check inside the RV for return air kit obstruc-
tions (i.e. door openings, room dividers, cur-
tains, ceiling fixtures, etc.) See FIG. 3 & 4.
FIG. 3
Micro-ThermFilterSystem
Micro-ThermFilter System
FILTER
RESET
FILTER
RESET
CLEAN
FILTER
CLEAN
FILTER
9-1/2"
39"
28-3/4"
17"
17"
2"
3/4"
18-1/2"
20-7/8"
Genesis
Standard
Grill

5
FIG. 5
FIG. 6
DoNotCut
RoofStructure
OrRafters
Good-Rafters
SupportedBy
CrossBeams
GoodLocation-
Between Roof
Rafters
Frame Opening So It
Won't Collapse When
Bolting Down Unit
Leave Access For Power
Supply Wiring
15" Min. At
FrontOf
Opening
3/4" Min.
It is the responsibility of the installer of this
air conditioner system to ensure structural
integrity of the RV roof. Never create a low
spot on the roof where water will collect. Wa-
ter standing around the air conditioner may
leak into the interior causing damage to the
product and the RV.
CAUTION
620412, 620415, 620425 & 620426 Series Installation Instructions
C. Roof Preparation
1. OpeningRequirements-Beforepreparingtheceil-
ing opening, the type of system options must be
decidedupon.Readallofthefollowinginstructions
beforebeginningtheinstallation.
Ifaroofventopeningwillnotbeuseda14-1/4"x14-
1/4"(±1/8")openingmustbecutthroughtheroofand
ceiling of the RV. This opening must be located
betweentheroofreinforcingmembers.
The14-1/4"x14-1/4"(±1/8")openingispart of the
returnairsystemoftheAirConditionerandmustbe
finished in accordance with NFPA Standard 501C
Section 2.7.2.
2. RoofVentRemoval
a. Unscrewandremovetheroofvent.
b. Remove all caulking compound around open-
ing.
c. Sealallscrewholesandseamswheretheroof
gasket is located. Use a good grade of all
weathersealant. See FIG.5.
d. Ifthe openingexceeds14-3/8"x14-3/8", itwill
benecessary tore-sizetheopeningto14-1/4"
x14-1/4" (±1/8").
e. If the opening is less than 14-1/8" x 14-1/8", it
mustbeenlarged.
3. NewOpening-(InstallationOtherThanVentOpen-
ing)
a. Marka14-1/4"x14-1/4"(±1/8")square on the
roofand carefullycuttheopening.
b. Using the roof opening as a guide, cut the
matching hole in the ceiling.
c. Theopeningcreatedmustbeframedtoprovide
adequate support and prevent air from being
drawnfromtheroofcavity.Lumber3/4"ormore
in thickness must be used. Remember to pro-
vide an entrance hole for power supplies, fur-
nacewiringandaseven-conductorcable,18to
22 AWG is to be used for analog thermostat
connections.
There may be electrical wiring between the
roof and the ceiling. Disconnect 120 volt AC
power cord and the positive (+) 12 volt DC ter-
minal at the supply battery. Failure to follow
this instruction may create a shock hazard
causing death or severe personal injury.
FIG. 4
14-1/4" x 14-1/4”
(±1/8”) OPENING
21-3/8”
KEEP THESE AREAS
FREE OF OBSTRUCTIONS 12"
REAR
OF
UNIT
4"
4"
4-1/8”
7-1/8”
7-1/8”
Center Line
of Unit
1-1/4"
1-1/2"
1-3/4"
1-1/2"
17"
17"
20-7/8"
3"
2"
2"
18-1/2"
3"
Air Grill Perimeter
14-1/4x 14-1/4
(±1/8")
Opening
Genesis
R
e
a
r
F
r
o
n
t
Standard
Grill
14-1/4x 14-1/4
(±1/8")
Opening

6
It is the responsibility of the installer to insure
the ductwork will not collapse or bend during
andaftertheinstallation.DometicCorporation
will not be liable for roof structural or ceiling
damage due to improperly insulated, sealed
or collapsed ductwork.
CAUTION
Return Air Cover Model 3105007 3308120
3105935 GenesisAir Filtration System
Roof Cavity Depth 2.0 In. Min. - 5-1/2 In. Max. 2.0 In. Min. - 5-1/2 In. Max.
Duct Cross Sectional Area 21.0 Sq. In. Min. 32.0 Sq. In. Min.
Duct Size
Depth 1-1/2 In. Min. - 2-1/2 In. Max. 2.0 In. Min. - 2-1/2 In. Max.
Width 7.0 In. Min. - 10.0 In. Max. 8.0 In. Min. - 10.0 In. Max.
Total Duct Length 15.0 Ft. Min. - 40.0 Ft. Max. 15.0 Ft. Min. - 40.0 Ft. Max.
Duct Length (short run) 1/3 Total Duct Length 1/3 Total Duct Length
Center Duct System (Only)
Depth 2.0" In. Min. - 2.0" Max.
Width 8.0 In. Min. - 8.0 In. Max.
Total Duct Length 15.0 Ft Min. - 40 Ft. Max.
Duct Length (Short Run) 1/3TotalLength
Register Requirements
Number Required Per Run 2 Min. 2 Min.
Register Free Air Area 14.0 Sq. In. 14.0 Sq. In.
Distance From Duct End 5.0 In. Min. - 8.0 In. Max. 5.0 In. Min. - 8.0 In. Max.
Distance From Elbow 15.0In. 15.0In.
Duct Static
Blower at High Speed,
Filter & Grill In Place 0.12 - 0.65 In. W.C. 0.12 - 0.65 In. W.C.
Note: Duct sizes listed are inside dimensions.
AIR DISTRIBUTION
DUCT SIZING & DESIGN CHART
620412, 620415, 620425 & 620426 Series Installation Instructions
4. Air Distribution System Sizing & Design
The Installer of this air conditioner system must
designtheairdistributionsystemfortheirparticular
application. Several requirements for this system
MUST be met for the air conditioner to operate
properly.Theserequirementsareasfollows:
a. The duct material must meet or exceed any
agencyorRVIAStandardthatmaybeinexist-
ence at the time the RV is produced.
b. All discharge air ducts must be properly insu-
latedtopreventcondensationfromformingon
their surfaces or adjacent surfaces during op-
eration of the air conditioner. This insulation
must be R-7 minimum.
c. Ductsandtheirjointsmustbesealedtoprevent
condensation from forming on adjacent sur-
facesduringoperationoftheairconditioner.
d. Returnairopeningsmusthave40squareinches
minimumfreeareaincludingthefilter.
e. Returnairtotheairconditionermustbefiltered
toprevent dirt accumulationonair conditioner
coolingsurface.
5. Air Distribution System Installation
a. Dometic Corporation recommends the basic
configuration shown on page 7, for installing
this air conditioner system. We have found by
testing, that this configuration works best in
most applications of this air conditioner sys-
tem.ItistheresponsibilityoftheInstallerofthis
systemtorevieweachRVfloorplananddeter-
minethefollowing:
•Duct size
•Duct layout
•Registersize
•Registerlocation
•Thermostatlocation

7
Register Required
FIG. 7A
FIG. 7B
Duct Size And Requirements For 3105007 And 3105935 Return Air Cover
Duct Size And Requirements For 33308120 Genesis Air Filtration System Kit
Total Outlet Air Area
Minimum 21.0 Sq. In.
Total Outlet Air Area
Minimum 32.0 Sq. In.
Register Required
Register Required
Register Required
Register Required
Register Required
Register Required
Register Required
Roof
Rafters
Roof
Rafters
Note: Duct Size is Inside Dimensions
Note: Duct Size is Inside Dimensions
Short Duct Run Minimum
1/3 Total Duct Length
Short Duct Run Minimum
1/3 Total Duct Length
Ducts Min. Max.
Depth 1-1/2” 2-1/2”
Width 7.0” 10.0”
Total Length 15.0’ 40.0’
Ducts Min. Max.
Depth 2.0” 2-1/2”
Width 8.0” 10.0”
Total Length 15.0’ 40.0’
14-1/4"x14-1/4" (±1/8")
RoofOpening
14-1/4"x14-1/4" (±1/8")
RoofOpening
Registers
4 Min.-- 8 Max.
(PerUnit)
14Sq. In FreeArea
PerRegister
Registers
4 Min.-- 8 Max.
(PerUnit)
14Sq. In FreeArea
PerRegister
FRAME
14-1/4" (±1/8”)
OPENING
AC POWER
SUPPLY WIRE
DUCT
FRAME DUCT
ROOF
INSULATION
DUCT CEILING
DUCT
14-1/4" (±1/8”)
OPENING
INSULATION
SIDE VIEW
(TOWARD BACK OF RV)
TOP VIEW
(BACK OF RV)
LOW VOLTAGE WIRES:
12VDC
Furnace
Load Shed
Sensors
FRAME
CCC, CONTROL CABLE(S)
or 7-Wire Analog Cable
FIG. 7
620412, 620415, 620425 & 620426 Series Installation Instructions
Theseitemsmustbedeterminedinconjunctionwiththe
AirDistributionSystemandSizingandDesignRequire-
mentslistedin the chartonpage6.Terminatethe start
oftheductatthebackedgeofthe14-1/4"x14-1/4"(±1/
8"). See FIG. 7, 7A, and 7B.
Important: Alternate configurations and methods
may be used which still allow the air conditioner to
operate properly; however, these alternate configura-
tions and methods must be approved by the Dometic
Corporation in writing. The following instructions are
basedupontheuse of3105007 DometicReturn AirKit,
3105935DometicReturnAirKitor3308120GenesisAir
Filtration System and a 3106995 Analog Thermostat.

8
HS
HP
+7.5 GND
HS/HP HI FAN
+7.5 FUR FAN
COOL GND
COOL FUR FAN
FAN
HI
FIG. 8
620412, 620415, 620425 & 620426 Series Installation Instructions
D. Wiring Requirements
1. Route a copper 12 AWG, with ground, 120 VAC
supplylinefromthetimedelayfuseorcircuitbreaker
boxtotheroof opening.
a. This supply line must be located in the front
portionofthe14-1/4"x14-1/4"(±1/8")opening.
b. ThepowerMUSTbeonaseparate20Amptime
delayfuseor HACR circuit breaker.
c. Make sure that at least 15" of supply wire
extendsintotheroofopening.Thisensuresan
easy connection at the junction box.
d. WiringmustcomplywithallNational,Stateand
LocalWiringCodes.
e. Useasteelsleeveandagrommetorequivalent
methodstoprotectthewirewhereitpassesinto
theopening.
2. Routeadedicated12VDCsupplyline(18-22AWG)
fromtheRV'sconverter(filteredterminals)orbattery
totheroofopening.
a. This supply line must be located in the front
portionofthe14-1/4"x14-1/4"(±1/8")opening.
b. Make sure that at least 15" of supply wire
extendsintotheroofopening.
3. Ifafurnaceistobecontrolledbythesystem,thetwo
furnacethermostatleadsmustberoutedtotheroof
opening. Make sure at least 15" of the furnace
thermostatwiresextendintotheroofopening.
4. Routeasevenconductor(18to22AWG)foranalog
thermostatconnections.Makesure15"ofthewires
extendsintotheroofopeningand6"extendfromthe
wallatthethermostatmountinglocation.SeeSec-
tion E-2.
E. Analog Thermostat & Cable Installation
1. AnalogThermostatLocation
Theproper location ofthethermostat is veryimportant
toensurethatitwill provide a comfortable RVtempera-
ture. Observe the following general rules when select-
ing a location:
a. Locate the Analog Thermostat 54" above the
floor.
b. InstalltheAnalogThermostaton a partition,not
on an outside wall.
c. Never exposeitto direct heatfrom lamps, sun
orother heat producingitems.
d. Avoid locations close to doors that lead out-
side,windows or adjoiningoutsidewalls.
e. Avoid locations close to supply registers and
theair fromthem.
f. A3/8"diameterholewillbeneededtoroutethe
seven conductor cable through the wall. See
SectionD-4.
2. SevenConductorCableInstallation.
a. A seven-conductor cable, 18 to 22AWG is to
beusedfor low voltage connections.
b. Choose the shortest, direct route from the 14-
1/4" x 14-1/4" (±1/8") opening to the thermo-
stat location selected.
c. Considerwherescrews,nailsorstaplesmight
contact the cable.
d. Leave approximately 6" of cable extending
through the wall for connection to the thermo-
stat.
e. Leaveapproximately15"ofcableextendinginto
the14-1/4"x14-1/4"(±1/8")openingforconnec-
tion at unit.
3. AnalogThermostatInstallation.
Note:Wirecolorslistedforthesevenconductorcablearethe
most common used in the RV industry. Wire Colors may
vary. Removethecoverfromthethermostatby startingat
onecornerandgentlyliftingitfromthebase.Insert
the seven conductor cable through the hole in the
baseassembly. Cutback the outercable shield 3"
and strip 1/4" of insulation from the inner wires.
Mount the thermostat level on the wall using the
screwsprovided.SeeFIG.8.
a. Connectred/white wire tothe thermostat +7.5
terminal.
b. Connectthegreenwiretothethermostat“GND”
terminal.
c. Connect the yellow wire to the thermostat
“COOL”Terminal.
d. Connect the tan wire to the thermostat “FAN”
terminal.
e. Connect the blue wire to the thermostat “HI
FAN”terminal.
f. Connecttheorangewiretothethermostat“HS/
HP”terminal(ifapplicable).
g. Connectthewhitewiretothethermostat“FUR”
terminal(ifapplicable).
h. Inspectconnectionstomakesuretheyaretight
and not touching any other terminals or wires.
i. Push the wires back through the base into the
wall. Place cover on the thermostat and push
until an audible click is heard.
Make Sure
Connections
Are Tight And
Do Not Touch
Screw Locations
Wiring

9
FIG. 10
FRONT
This unit weighs approximately 100 pounds.
Topreventbackinjury,useamechanicalhoist
to place Air Conditioner on roof.
FIG. 9
Do not slide the unit. This may damage the
roof gasket attached to the bottom and may
create a leaky installation.
CAUTION
FIG. 11 Divider Plate
Ceiling Template Return Air
Cover
Return Air
Grill
620412, 620415, 620425 & 620426 Series Installation Instructions
F. Placing Air Conditioner On The Roof
1. Removetheair conditioner fromthecartonand dis-
card carton. See FIG. 9.
2. Place the air conditioner on the roof.
3. Liftandplacetheunitoverthepreparedopeningusing
the gasket on the unit as a guide. See FIG. 10.
4. Place the Return Air Kit inside the RV. This box
contains mounting hardware for the air conditioner
and will be used inside the RV. See FIG. 9.
Thiscompletestheoutsidework.Minoradjustments
can be done from the inside of the RV if required.
G. Installing The Air Conditioner
Installing Unit with 3105007 or 3105935 Return Air
Kit.ForunitwithGenesisAirFiltrationSystem,see
page 11.
1. InstallationOfCeilingTemplate
a. Check gasket alignment of the air conditioner
over the roof opening and adjust if necessary.
Unit may be moved from below by slightly lift-
ingand moving. SeeFIG. 11.
b. Remove return air cover and ceiling template
fromthe3105007or3105935carton.
c. Locatethefour(8"x1/4-20)unitmountingbolts,
junctionboxcoverandRomex connector in the
3107180bolt kit.
d. Pull down the unit's electrical cord and fasten
the junction box with screws to the framing in
the front of the 14-1/4" x 14-1/4" (±1/8") open-
ing. See FIG. 13.
7Conductor
Thermostat
Cable
Gasket
Pull Electrical
Cord Down
FIG. 13
AC Power
Supply
Fasten Jct. Box To
Front Of Opening
FIG. 12 Center Unit From Below
Roof
Gasket

10
FIG. 15
CAUTION
If bolts are left loose there may not be ad-
equate roof seal or if over tightened, damage
may occur to the air conditioner base or ceil-
ing template. Tighten to specifications listed
in this manual.
FIG. 16
Improper installation and sealing of divider
platewillcausethecompressortoquickcycle
onthe cold control. This may result in fuseor
circuit breaker opening and/or lack of cool-
ing.
CAUTION
FIG. 14
Finger
Tight
Front of Vehicle
Tighten to
compressgasket
to 1/2"
Roof
Gasket
Screws
620412, 620415, 620425 & 620426 Series Installation Instructions
e. InstalltheRomexconnectorin thejunctionbox.
f. Hold the ceiling template up to the 14-1/4" x
14-1/4"(±1/8")opening.Be sure the largeplate
faces the rear of the RV.
g. Starteachmountingboltthroughtheceilingtem-
plate and up into the unit base pan by hand.
Install wood screw (not supplied) in each end
oftheceilingtemplate.Thisinsuresa tight fit of
the return air cover to ceiling. See FIG. 14.
Evenlytightenmountingboltstocompress
gasket to 1/2" this will be a torque of 40 - 50
inch pounds. The bolts are self locking so
over tightening is not necessary. See FIG.
14.
2. InstallationofDividerPlate
a. Measure the ceiling to roof thickness:
• If distance is 2.0" - 3-3/4", remove perfo-
ratedtabfromdividerplate.
• Ifdistanceis3-3/4”-5-1/2”,removenotabs.
b. Remove the backing paper from double sided
tape located on ceiling template. See FIG. 15.
c. Place divider plate up to bottom of air condi-
tioner base pan firmly. The foam tape on the
divider plate must seal to bottom of base pan.
See FIG. 16.
d. Withslightpressurethenpushthedividerplate
against the double sided tape on the ceiling
template.
Note: The adhesive on the insulation is extremely sticky.
Be sure the part is located where desired before pressing
into place.
e. Locatethe1/8”x 7” x 18” self-adhesiveinsula-
tionsuppliedwiththereturnairkit.Removethe
backingpaperfromtheinsulationandcarefully
stick onto the ceiling template divider panel.
See FIG. 17.
•Excess width is intended to seal the di-
viderplate to the sidesofthe 14-1/4" x14-
1/4" (±1/8") opening. This is to help pre-
ventcoldairdischargefrom circulating into
theairconditioner return air opening.
•If the insulation is too high, stick excess
height of insulation to the air conditioner
basepan.Donotcoverupunitrating plate.
FIG. 17

11
FIG. 19
Upside
Down
Foam
Divider
Base Pan
Ceiling
Place Foam Divider in
(14-1/4" x 14-1/4" (±1/8")
CeilingOpening against
Base Pan Bottom
Do Not Peel Tape Off
Adhesive
FoamDivider Ceiling
Level (±1/4")Tear Off
Excess
FIG. 20 Foam Divider
Adhesive
Peel Off Paper - Center Divider - Stick To
Rear Flange On Ceiling Template
If bolts are left loose there may not be ad-
equate roof seal or if over tightened, damage
may occur to the air conditioner base or ceil-
ing template. Tighten to specifications listed
in this manual.
CAUTION
Micro-ThermFilterSystem
Micro-Therm Filter System
FILTER
RESET
FILTER
RESET
CLEAN
FILTER
CLEAN
FILTER
Return Air
Cover
FIG. 18
Grill
Foam
Divider Ceiling
Template
Slider Filter
Handle
Genesis Air Filtration System
Return Air Kit
620412, 620415, 620425 & 620426 Series Installation Instructions
Installing unit with 3308120 Genesis Air Filtration
System Return Air Kit. For unit with 3105007 or
3105935 Return Air Kit, see page 9.
1. AllNon-CenterDuct Installations
Note: TheGenesisAirFiltrationSystem can be installed on
unitsthatuse a center dischargeductthroughthe14-1/4"x
14-1/4"(±1/8") opening. Installingunitswith the centerdis-
chargeduct go to Section1."Center Discharge DuctAppli-
cationInstallation", onpage 12.
a. Check gasket alignment of the air conditioner
over the roof opening and adjust if necessary.
Unit may be moved from below by slightly lift-
ingand moving. SeeFIG. 12.
•Removereturn air cover, ceiling template,
foamdividerandair filter fromthe3308120
carton.
•Locatethefour (8" x 1/4-20)unitmounting
bolts, junction box cover and Romex con-
nector in the 3107180 bolt kit.
•Pulldowntheunits electrical cord andfas-
tenthejunctionboxwithscrewstothefram-
ingin the frontofthe 14-1/4" x14-1/4"(±1/
8") opening. See FIG. 13.
b. MeasuringFoamDivider
•Locate the foam divider and insert it cor-
ner to corner in the 14-1/4" x 14-1/4" (±1/
8")opening with the adhesivetapeup (Do
notremovepapertoexposeadhesive).The
foamdividershouldbelevelwiththe ceiling
(±1/4"). Tear off the excess at the pre-cut
perforationsindivider. See FIG. 19.
c. InstallFoamDivider
•Peel the paper off of the foam divider and
stick it in place on the center of the rear
flangeofthe return air opening ontheceil-
ing template. See FIG. 20.
d. InstallCeilingTemplate
•Start each mounting bolt through the ceil-
ingtemplate and upintothe unit basepan
by hand. EVENLY tighten the four bolts
toatorque of 40 to 50inchpounds.This
will compress the roof gasket to ap-
proximately 1/2". The bolts are self
locking so over tightening is not nec-
essary.

12
If bolts are left loose there may not be ad-
equate roof seal or if over tightened, damage
may occur to the air conditioner base or ceil-
ing template. Tighten to specifications listed
in this manual.
CAUTION
FIG. 22 Stick Weather Strip To Top
Of Ceiling Template
Weather Strip
Ceiling
Template
FIG. 21
Mark And Cut 2” x 8”
Opening For Center Duct
Tape Covered
Adhesive
620412, 620415, 620425 & 620426 Series Installation Instructions
Improper installation and sealing of foam di-
viderwillcausethecompressortoquickcycle
onthe cold control. This may result in fuseor
circuit breaker opening and/or lack of cool-
ing.
CAUTION
FIG. 20 UseAluminumFoil Tape To Sealthe
Foam Divider To The Sides of 14-1/4"
x 14-1/4" (±1/8") Ceiling Opening
Make Sure To Seal
BehindFlange
e. Use Aluminum foil tape (not supplied) to seal
theends of thefoam divider to thesides of the
opening.Makesuretheareabehindtheflange
onthe ceiling template is sealed.See FIG. 20.
2. CenterDischargeDuctApplicationInstallation
Note: Ifusing non-centerduct installation, go to Section1.
"AllNon-Center Duct Installations",onpage11.
Important:Aduct adapter (not supplied) must be installed
betweentheunit dischargeandthe customer installed cen-
ter duct. This duct adapter must be approved by Dometic.
a. Check gasket alignment of the air conditioner
over the roof opening and adjust if necessary.
Unit may be moved from below by slightly lift-
ingand moving. SeeFIG. 12.
•Removereturnair cover, ceilingtemplate,
foamdividerandair filter fromthe3308120
carton.
•Locatethefour(8" x 1/4-20) unit mounting
bolts, junction box cover and Romex con-
nector in the 3107180 bolt kit.
•Pulldowntheunit'selectricalcordandfas-
ten the junction box with screws to the
framinginthefront of the 14-1/4" x14-1/4"
(±1/8")opening. See FIG. 13.
b. SizingFoamDivider
•Cutnotchinthecenter section of the foam
divider to fit (approximately 2 x 8 inches)
snugly around duct. See FIG. 21.
•Placethefoamdividerinthereturnairopen-
ingabove the center ductbeforeinstalling
ceilingtemplate.
c. Install CeilingTemplate
•Applyapieceoffoamweatherstripping(not
supplied) to the upper side of ceiling tem-
plate to make a seal between it and the
duct.Usea softpieceoffoamweatherstrip
1 x 3/4 x 10 inches. See FIG. 22.
•Start each mounting bolt through the ceil-
ingtemplate and upintothe unit basepan
by hand. EVENLYtighten the four bolts
toatorque of 40 to 50inchpounds.This
will compress the roof gasket to ap-
proximately 1/2". The bolts are self
locking so over tightening is not nec-
essary.
Improper installation and sealing of foam di-
viderwillcausethecompressortoquickcycle
onthe cold control. This may result in fuseor
circuit breaker opening and/or lack of cool-
ing.
CAUTION
e. Use Aluminum foil tape (not supplied) to seal
theends of thefoam divider to thesides of the
14-1/4" x 14-1/4" (±1/8") opening. Make sure
the area behind the flange on the ceiling tem-
plate is sealed. See FIG. 20.
f. Cut the opening in the center duct using the
dischargeopening in the ceilingtemplatefor a
pattern.Sealthecenterducttothe ceiling tem-
plate using foil tape, foam insulation or silicon
sealant.
FoamDivider Ceiling
Level (±1/4")Tear Off
Excess

13
FIG. 23 Return Air
Cover
Hole
Plugs Return
Air Grill
CAUTION
Disconnect the positive (+) 12 volt DC termi-
nal at the supply battery. Damage to equip-
ment could occur if the 12 volt DC is not shut
off.
620412, 620415, 620425 & 620426 Series Installation Instructions
H. Wiring The System
Reach up into the return air opening and pull the re-
mainingwiresdown.
1. ConnectionOfLow VoltageWires
Note: If solar panel is installed see instructions packaged
withsolar panel option.
Note: If using the Genesis Air Filtration System steps "a"
and "b" are to be completed when installing the decorative
cover.
Note:Wirecolorslistedforthesevenconductorcablearethe
most common used in the RV industry. Wire Colors may
vary. a. Connect the previously run 12 VDC to the red
and blackwiresprotrudingfromtheunitsreturn
airopening.Connect +12VDCtotheredwire;
–12 VDC to the black wire.
b. Connectthepreviouslyrunfurnacethermostat
wires (if applicable) to the blue/white wires
protruding fromtheunitsreturnairopening.The
polarity of these connections does not matter.
c. Connectred/whitewireprotrudingfromtheunits
return air opening to the seven wire cable
connected at thermostat +7.5 terminal.
d. Connectthegreenwireprotrudingfromtheunits
return air opening to the seven wire cable
connectedatthermostat“GND”terminal.
e. Connect the yellow wire protruding from the
unitsreturnairopeningtothesevenwirecable
connectedatthermostat“COOL”Terminal.
f. Connect thetanwire protruding fromthe units
return air opening to the seven wire cable
connectedatthermostat“FAN”terminal.
g. Connectthebluewireprotrudingfromtheunits
return air opening to the seven wire cable
connectedatthermostat“HIFAN”terminal.
h. Connect the orange wire protruding from the
unitsreturnairopeningtothesevenwirecable
connected at thermostat “HS/HP” terminal (if
applicable).
i. Connectthewhitewireprotrudingfromtheunits
return air opening to the seven wire cable
connectedatthermostat“FUR”terminal(ifap-
plicable).
This product is equipped with a 3-wire
(grounded) system for protection against
shockhazard.Makesurethattheapplianceis
wired into a properly grounded 120 volt AC
circuitandthepolarityiscorrect.Failuretodo
so could result in death, personal injury or
damage to the equipment.
Disconnect120voltAC. Failure to follow these
instructions could create a shock hazard
causing death or severe personal injury.
2. ConnectionOf 120VoltPowerSupply
a. Route power supply line through Romex con-
nectorinto junction boxon sideaway from the
ceilingtemplate.Tightenconnector,beingcare-
ful not to pinch or short wires.
b. Connect white to white; black to black; and
greentogreenorbarecopperwireusingappro-
priate sized twist connectors.
c. Tape the twist wire connectors to the supply
wireto assuretheydon'tvibrateoff.
d. Push the wires into the box.
e. Install the cover onto the junction box.
I. Installing Decorative Inside Cover
Installing unit with 3105007 or 3105935 Return
Air Cover. For Genesis Air Filtration System
Return Air Kit, see page 14.
1. Removethereturnairgrillfromthereturnair cover.
2. Place the return air cover up to the ceiling tem-
plate.
3. Install cover to template with #8 x 3/8” blunt point
Phillipsheadscrewsprovided(6required).
4. Reinstall filter return air grill into return air cover.
Aligntabswithmating notches and snap intoplace
5. Install two hole plugs into screw holes in back of
returnair cover.See FIG.23.
6. Thiscompletestheinstallationoftheairconditioner.
We recommend that power be supplied to the air
conditionerandcheck forproperoperation.Referto

14
620412, 620415, 620425 & 620426 Series Installation Instructions
Micro-ThermFilterSystem
Micro-Therm Filter System
FILTER
RESET
FILTER
RESET
CLEAN
FILTER
CLEAN
FILTER
Return Air
Cover
FIG. 24
Grill
Foam
Divider Ceiling
Template
Slider Filter
Handle
Genesis Air Filtration System
Return Air Kit
OperatingManualor Users Guide for adescription
oftheair conditioner operation.
Installing unit with 3308120 Genesis Air Filtra-
tion System Return Air Kit. For 3105007 or
3105935 Return Air Kit, see page 13.
1. Install the slider in the return air cover and raise it
to the ceiling template. Route the filter indicator
wiresfromthereturnaircoverthroughthe template
slot leaving 3" extended. Place the wires where
theycanbe reached after plasticcoverisinstalled.
Place the front of the return air cover against the
ceiling and slide towards the rear. The flange on
theceiling templatewill catch inthe groove on the
return cover. Adjust the position (right to left) and
install the front two screws. Start and tighten the
remaining screws to hold it in place. Connect to-
getherthewires from thethermostat,unitand filter
indicator.
Note: If solar panel is installed see instructions packaged
withsolar panel option.
a. Connecttheredwirefromtheunit,theredwire
from the filter indicator light with the red DC
positivepower lead.See FIG. 24.
b. Connect the black (-12V) wire from the unit,
theblack wire from thefilter indicator light with
theblack (-12V)power lead.
Note: Number10cabinetscrew(not supplied) can be used
toreplace the twofront screws whenthe ceiling materialis
hard.
2. Tightenthescrewsholdingthereturnaircover.Slide
thefilter from theright side (lookingtowardthe RV
front) over the filter indicator wires. Make sure the
wires are above the filter and are out of its way.
3. Place grill on return air cover and snap in place,
and install decal on end over circuit board.
4. Place slide handle through slots in grill into the
slide posts. Handle will fit in either direction.
5. Thiscompletestheinstallationoftheairconditioner.
We recommend that power be supplied to the air
conditionerandcheck forproperoperation.Referto
OperatingManualorUser’sGuideforadescription
oftheair conditioner operation.
FIG. 25
Route Wires From
Return Air Cover
Through Slot

15
FIELD WIRING DIAGRAM
G/Y
YEL
RED
G/Y
FAN
COMPRESSOR
S
C
R
BLK
MOTOR
WHT
RED
FAN
C
HERM
WHT
BRN
WHT
RUN CAP
RUN CAP
WHT
BLK
RED
T3
T4
K5
K4
RED CON 2
CON 2
COM
COM
NO
NO
T2
T1
CON 1
CON 1
BLU
WHT ORN
GRN
RED/WHT
TAN
YEL
3308032.071
ONLY
CONDUCTORS
USE COPPER
USE COPPER
TO 115 VAC 60 Hz.1O
TO 115 VAC 60 Hz.1O
TO LOW VOLT THERMOSTAT CABLE
TO LOW VOLT THERMOSTAT CABLE
BLU/WHT
BLU/WHT
HEAT ACCESSORY
WHT
BLK
BLK
ELEMENT
LIMIT
31
SWITCH
WHT
BLK
OL
FUSE
SPLICE CAP
SPLICE CAP
WHT
CON 3
CON 3
FREEZE
BLK BLK
NOT AVAILABLE
ON SOME
ON SOME
MODELS
CONTROL
+
BLK
TO FURNACE
TO FURNACE
BLU
SOLAR OR
SOLAR OR
DIRTY FILTER
INDICATOR
IF USED
IF USED
12V
DIELECTRIC
PASSED
MOTOR
STARTER
START CAP
620412, 620415, 620425 & 620426 Series Installation Instructions