Dometic Duo-Therm 39424.602 Manual

1
USAUSAUSAUSAUSA
SERVICEOFFICE
TheDometicCorp.
509So.Poplar St.
LaGrange,IN46761
219-463-4858
CANADACANADACANADACANADACANADA
DometicDist.
866LangsDr.
Cambridge,Ontario
CANADAN3H2N7
519-653-4390
ForServiceCenterFor ServiceCenterForServiceCenterFor ServiceCenterForServiceCenter
AssistanceCall:AssistanceCall:AssistanceCall:AssistanceCall:AssistanceCall:
800-544-4881
INSTINSTINSTINSTINSTALLAALLAALLAALLAALLATION & OPERATION & OPERATION & OPERATION & OPERATION & OPERATINGTINGTINGTINGTING
INSTRUCTIONSINSTRUCTIONSINSTRUCTIONSINSTRUCTIONSINSTRUCTIONS
RECORD THIS INFORMATION FOR FUTURE REFERENCERECORD THIS INFORMATION FOR FUTURE REFERENCERECORD THIS INFORMATION FOR FUTURE REFERENCERECORD THIS INFORMATION FOR FUTURE REFERENCERECORD THIS INFORMATION FOR FUTURE REFERENCE
BEFOREBEFOREBEFOREBEFOREBEFORE INSTALLING THE UNIT: INSTALLING THE UNIT: INSTALLING THE UNIT: INSTALLING THE UNIT: INSTALLING THE UNIT:
ModelNumber
SerialNumber
DatePurchased
PlaceofPurchase
THIS UNIT IS DESIGNED FOR OEM INSTALLATIONTHIS UNIT IS DESIGNED FOR OEM INSTALLATIONTHIS UNIT IS DESIGNED FOR OEM INSTALLATIONTHIS UNIT IS DESIGNED FOR OEM INSTALLATIONTHIS UNIT IS DESIGNED FOR OEM INSTALLATION
ALL INITIAL INSTALLATIONS MUST BE APPROVED BY THE SALES DEPT.ALL INITIAL INSTALLATIONS MUST BE APPROVED BY THE SALES DEPT.ALL INITIAL INSTALLATIONS MUST BE APPROVED BY THE SALES DEPT.ALL INITIAL INSTALLATIONS MUST BE APPROVED BY THE SALES DEPT.ALL INITIAL INSTALLATIONS MUST BE APPROVED BY THE SALES DEPT.
®®®®®
®®®®®
RRRRROOOOOTTTTTARARARARARY COMPRESSORY COMPRESSORY COMPRESSORY COMPRESSORY COMPRESSOR
SYSTEM MODEL 39424.602SYSTEM MODEL 39424.602SYSTEM MODEL 39424.602SYSTEM MODEL 39424.602SYSTEM MODEL 39424.602
39224.60239224.60239224.60239224.60239224.602
SELF-CONTSELF-CONTSELF-CONTSELF-CONTSELF-CONTAINED AIR CONDITIONER/AINED AIR CONDITIONER/AINED AIR CONDITIONER/AINED AIR CONDITIONER/AINED AIR CONDITIONER/
HEAHEAHEAHEAHEAT PUMP FORT PUMP FORT PUMP FORT PUMP FORT PUMP FOR
RECREARECREARECREARECREARECREATIONALTIONAL
TIONALTIONAL
TIONAL VEHICLESVEHICLESVEHICLESVEHICLESVEHICLES
SYSTEMSYSTEMSYSTEMSYSTEMSYSTEM
MODELMODELMODELMODELMODEL
39424.60239424.60239424.60239424.60239424.602
39224.60239224.60239224.60239224.60239224.602
This Manual should be read andThis Manual should be read andThis Manual should be read andThis Manual should be read andThis Manual should be read and
understood before installation,understood before installation,understood before installation,understood before installation,understood before installation,
adjustment, service or mainte-adjustment, service or mainte-adjustment, service or mainte-adjustment, service or mainte-adjustment, service or mainte-
nance is performed. This unitnance is performed. This unitnance is performed. This unitnance is performed. This unitnance is performed. This unit
must be installed and servicedmust be installed and servicedmust be installed and servicedmust be installed and servicedmust be installed and serviced
by a qualified serviceman. Modi-by a qualified serviceman. Modi-by a qualified serviceman. Modi-by a qualified serviceman. Modi-by a qualified serviceman. Modi-
fication of this appliance can befication of this appliance can befication of this appliance can befication of this appliance can befication of this appliance can be
extremely hazardous and couldextremely hazardous and couldextremely hazardous and couldextremely hazardous and couldextremely hazardous and could
result in personal injury or prop-result in personal injury or prop-result in personal injury or prop-result in personal injury or prop-result in personal injury or prop-
erty damage.erty damage.erty damage.erty damage.erty damage.
Lire et comprendre ce manuel avant deLire et comprendre ce manuel avant deLire et comprendre ce manuel avant deLire et comprendre ce manuel avant deLire et comprendre ce manuel avant de
procéder à l'installation, à desprocéder à l'installation, à desprocéder à l'installation, à desprocéder à l'installation, à desprocéder à l'installation, à des
réglages, de l'entretien ou desréglages, de l'entretien ou desréglages, de l'entretien ou desréglages, de l'entretien ou desréglages, de l'entretien ou des
réparations. L'installation et l'entretienréparations. L'installation et l'entretienréparations. L'installation et l'entretienréparations. L'installation et l'entretienréparations. L'installation et l'entretien
de cet appareil doivent être effectuésde cet appareil doivent être effectuésde cet appareil doivent être effectuésde cet appareil doivent être effectuésde cet appareil doivent être effectués
par un réparateur qualifié. Toute modi-par un réparateur qualifié. Toute modi-par un réparateur qualifié. Toute modi-par un réparateur qualifié. Toute modi-par un réparateur qualifié. Toute modi-
fication de cet appareil peut êtrefication de cet appareil peut êtrefication de cet appareil peut êtrefication de cet appareil peut êtrefication de cet appareil peut être
extrêmement dangereuse et entraînerextrêmement dangereuse et entraînerextrêmement dangereuse et entraînerextrêmement dangereuse et entraînerextrêmement dangereuse et entraîner
des blessures ou dommagesdes blessures ou dommagesdes blessures ou dommagesdes blessures ou dommagesdes blessures ou dommages
matériels.matériels.matériels.matériels.matériels.
FormNo. 3106685.039 8/96
(French3108235.007)
©1996 TheDometic Corp.
LaGrange,IN 46761

2
INDEXINDEX
INDEXINDEX
INDEX
****
****
** TheManufacturergivesonlygeneral
guidelinesforgeneratorrequirements.These
generatorrequirementscomefrom
experiencesconsumershavewithour
equipmentinfieldapplications.Whensizing
thegenerator,thetotal electrical power must
betakenintoconsideration.Keepinmind
thatgeneratorslosepowerbecause of
altitudeincreasesabove sea level , high
outdoortemperaturesandlackofmainte-
nance.
1.1.
1.1.
1. SPECIFICASPECIFICA
SPECIFICASPECIFICA
SPECIFICATIONS,TIONS,
TIONS,TIONS,
TIONS, GENERAL INFORMAGENERAL INFORMA
GENERAL INFORMAGENERAL INFORMA
GENERAL INFORMATION & LOCATION & LOCA
TION & LOCATION & LOCA
TION & LOCATIONTION
TIONTION
TION
SystemModelSystemModel
SystemModelSystemModel
SystemModel 39424 and 3922439424 and 39224
39424 and 3922439424 and 39224
39424 and 39224
NominalBTUCapacity 27,000
Volts/Phase/Hertz(eachcircuit) 115 AC / 1 / 60
RunAmpsComp/Motor [Circuit 1 =8.7/4.1] [Circuit 2 = 8.7 /4.1]
LRACompressor [Circuit 1 = 54] [Circuit 2 = 54]
Normal Min. 1 Unit 5.0 KW
Generator Size ****
****
**
Wire Size Up to 24 ft. -
UseNo. 12 AWG CopperConductors
CircuitProtection 15 Amp Time Delay Fuse or
EachCircuit 15 Amp HACR Circuit Breaker
ControlVoltage 12VDC
Refrigerant R-22
SystemRefrigerantCharge 22.5 oz. (each Circuit)
Size(In Inches) Width Height Depth
44 16.25 21
Installed 185Pounds
Weight
GENERAL INFORMAGENERAL INFORMA
GENERAL INFORMAGENERAL INFORMA
GENERAL INFORMATIONTION
TIONTION
TION
THE 39424 AIR CONDITIONING HEAT PUMP:THE 39424 AIR CONDITIONING HEAT PUMP:
THE 39424 AIR CONDITIONING HEAT PUMP:THE 39424 AIR CONDITIONING HEAT PUMP:
THE 39424 AIR CONDITIONING HEAT PUMP:
Was designed to operate in a MILD GEOGRAPHICALMILD GEOGRAPHICAL
MILD GEOGRAPHICALMILD GEOGRAPHICAL
MILD GEOGRAPHICAL
AREAAREA
AREAAREA
AREA for heating where the heat loss is minimum. The
39424 will operate down to an outside ambient tempera-
ture of 24 degrees. At 24 degrees, the outdoor ambient
sensor will turn off the heat pump circuit and start up the
coach'smain furnace.As longas thetemperature remains
below 24 degrees, the main furnace will heat your home.
As the outside temperature increases to 34 degrees, the
ambient sensor switches back to the heat pump circuit.
The advantages of the 39424 heat pump central air
conditioner are:
1. It's user friendly – only one unit for both heating and
cooling;
2. The heat pump uses the campsite electrical hookup
and saves on trips to refill the LP tanks;
3. An LP furnace is not needed, depending upon coach
size, when used in mild climates where the outdoor
temperature range is 40 degrees or higher.
NOTE: Geographical location usage should be deter-NOTE: Geographical location usage should be deter-
NOTE: Geographical location usage should be deter-NOTE: Geographical location usage should be deter-
NOTE: Geographical location usage should be deter-
mined before omitting a central furnacemined before omitting a central furnace
mined before omitting a central furnacemined before omitting a central furnace
mined before omitting a central furnace.
4. The unit is not exposed to the elements.
THE 39224 CENTRAL AIR CONDITIONING UNIT:THE 39224 CENTRAL AIR CONDITIONING UNIT:
THE 39224 CENTRAL AIR CONDITIONING UNIT:THE 39224 CENTRAL AIR CONDITIONING UNIT:
THE 39224 CENTRAL AIR CONDITIONING UNIT:
Was designed for installation in a basement storage
compartment of the RV. The advantages of the 39224
central air conditioning unit are the unit is not exposed to
the elements, easier to service, and eliminates the need
for two roof mounted air conditioning units.
The39224isdesignedtobeusedexclusivelywithexternal
ductwork for the cold air discharge. There are not provi-
sionsforanelectricheatertobeinstalledaspartoftheunit.
The heating of the RV will be supplied by the central
furnace, if installed.
Since it is necessary to install all or part of the ductwork in
theceilingandsidewallorfloor,itistheresponsibilityofthe
RV manufacturer to assure that structural integrity is
maintained throughout the coach. The RV manufacturer
should review each RV floor plan to determine proper duct
design and register location.
The Dometic Product Engineering and Applications De-
partments are available for recommendations and sug-
gestions.
1. Specifications,GeneralInformation,Location ....................... 2-3
2. CondenserSection ............................................................... 3
A. SupplyAir....................................................................... 3
B. FreeArea ....................................................................... 3
3. Mounting ............................................................................... 3
4. LowTemperatureOperations ............................................... 3
Clearances ........................................................................... 4
5. EvaporatorSection ............................................................... 4
A. InletAir ........................................................................... 4
B. Grills............................................................................... 4
C. OutletAir ........................................................................ 4
D. CondensateDrain .......................................................... 4
6. ElectricalWiring ....................................................................5
7. Dometic Comfort Control Center & CableInstall...................5
8. SystemWiringInstructions ...................................................6
A. ConnectionofLowVoltageWires ..................................6
9. SystemCheckout&Configuration ........................................6
10. AdditionalFeature.................................................................7
11. Maintenance .........................................................................7
12. Service..................................................................................7
— ElectricalBox,JunctionBoxIllustrations...............................8
— WiringDiagram .....................................................................9

3
LOCATIONLOCATION
LOCATIONLOCATION
LOCATION
This system is intended for installation in a recreational
vehicle where the interior is essentially one undivided
space. (See FIG. 1)
A Condenser SectionCondenser Section
Condenser SectionCondenser Section
Condenser Section MUST be installed with DIRECT
access to the out-of-doors.
FIG. 1FIG. 1
FIG. 1FIG. 1
FIG. 1
2.2.
2.2.
2. CONDENSER SECTIONCONDENSER SECTION
CONDENSER SECTIONCONDENSER SECTION
CONDENSER SECTION
A.A.
A.A.
A. SUPPLY AIRSUPPLY AIR
SUPPLY AIRSUPPLY AIR
SUPPLY AIR
The inlet of the condenser coil should be positioned so
that it draws air from outside the vehicle. SPECIALSPECIAL
SPECIALSPECIAL
SPECIAL
CARE MUST BE TAKEN TO PREVENT THE DIS-CARE MUST BE TAKEN TO PREVENT THE DIS-
CARE MUST BE TAKEN TO PREVENT THE DIS-CARE MUST BE TAKEN TO PREVENT THE DIS-
CARE MUST BE TAKEN TO PREVENT THE DIS-
CHARGE AIR FROM RECIRCULATING TO THE IN-CHARGE AIR FROM RECIRCULATING TO THE IN-
CHARGE AIR FROM RECIRCULATING TO THE IN-CHARGE AIR FROM RECIRCULATING TO THE IN-
CHARGE AIR FROM RECIRCULATING TO THE IN-
LET OF THE CONDENSER COIL.LET OF THE CONDENSER COIL.
LET OF THE CONDENSER COIL.LET OF THE CONDENSER COIL.
LET OF THE CONDENSER COIL. Shields should be
added to ensure fresh air supply. (See FIG. 2A).
CAUTIONCAUTION
CAUTIONCAUTION
CAUTION
DONOTINSTALLTHECONDENSERWHERE THEFANDONOTINSTALLTHECONDENSERWHERETHEFAN
DONOTINSTALLTHECONDENSERWHERE THEFANDONOTINSTALLTHECONDENSERWHERETHEFAN
DONOTINSTALLTHECONDENSERWHERE THEFAN
WILL DRAW AIR FROM THE EXHAUST OF THE VE-WILL DRAW AIR FROM THE EXHAUST OF THE VE-
WILL DRAW AIR FROM THE EXHAUST OF THE VE-WILL DRAW AIR FROM THE EXHAUST OF THE VE-
WILL DRAW AIR FROM THE EXHAUST OF THE VE-
HICLE,AMOTORGENERATORSET,TRANSMISSION,HICLE,A MOTOR GENERATOR SET, TRANSMISSION,
HICLE,AMOTORGENERATORSET,TRANSMISSION,HICLE,A MOTOR GENERATOR SET, TRANSMISSION,
HICLE,AMOTORGENERATORSET,TRANSMISSION,
ROAD HEAT ORROAD HEAT OR
ROAD HEAT ORROAD HEAT OR
ROAD HEAT OR ANYANY
ANYANY
ANY OTHER HEAT PRODUCINGOTHER HEAT PRODUCING
OTHER HEAT PRODUCINGOTHER HEAT PRODUCING
OTHER HEAT PRODUCING
SOURCE.SOURCE.
SOURCE.SOURCE.
SOURCE.
The condenser section is a "draw-through" type. When
the face of the coil is positioned behind a louvered or
othertypeofrestrictiveopening,theFREEAREAofthe
opening must be at least 460 square inchesat least 460 square inches
at least 460 square inchesat least 460 square inches
at least 460 square inches.
B.B.
B.B.
B. FREE AREAFREE AREA
FREE AREAFREE AREA
FREE AREA — is the opening that remains in a grill or
louvered panel after the restrictions are taken away.
For example, an opening of 10 x 20 inches has 200
squareinches.Whenthisopeningiscoveredwithagrill
that is 56 percent open, the FREE AREA is (200 x .56),
112 square inches.
Expanded and perforated metal grills in general vary from
30percentto60percentopen. Becertainthat 460square460square
460square460square
460square
inchesinches
inchesinches
inches of FREE AREA is available to the face of the
condenser.
FIELD INSTALLED SHIELD THAT WILL PREVENTFIELD INSTALLED SHIELD THAT WILL PREVENT
FIELD INSTALLED SHIELD THAT WILL PREVENTFIELD INSTALLED SHIELD THAT WILL PREVENT
FIELD INSTALLED SHIELD THAT WILL PREVENT
RECIRCULATIONOFCONDENSERAIR.RECIRCULATIONOFCONDENSERAIR.
RECIRCULATIONOFCONDENSERAIR.RECIRCULATIONOFCONDENSERAIR.
RECIRCULATIONOFCONDENSERAIR.
FIG. 2AFIG. 2A
FIG. 2AFIG. 2A
FIG. 2A
8
82
2
2
1/2
1/2
1/2
1/2
3636
3636
36
6464
6464
64
EXAMPLE OF HOW TO DETERMINE FREE
AREA OR % OPEN AREA:
TOTAL AREATOTAL AREA
TOTAL AREATOTAL AREA
TOTAL AREA =8 X 88 X 8
8 X 88 X 8
8 X 8 ==
==
=6464
6464
64
FREE AREAFREE AREA
FREE AREAFREE AREA
FREE AREA ==
==
=2 X 2 X 9 openings2 X 2 X 9 openings
2 X 2 X 9 openings2 X 2 X 9 openings
2 X 2 X 9 openings
==
==
=3636
3636
36
% OPEN AREA% OPEN AREA
% OPEN AREA% OPEN AREA
% OPEN AREA ==
==
===
==
=56%56%
56%56%
56%
FIG. 2BFIG. 2B
FIG. 2BFIG. 2B
FIG. 2B
NOTENOTE
NOTENOTE
NOTE: Service access must always be supplied either as
clearance or as a defined access panel.
3.3.
3.3.
3. MOUNTINGMOUNTING
MOUNTINGMOUNTING
MOUNTING
The Dual Heat Pump Air Conditioning unit design is for
installation below the floor in an unfinished storage com-
partment. This unit should be mounted in an angle-iron
frame, designed and built for the Dual Compressor Unit.
Optional mounting, with frame rails attached within the
unfinishedcompartment. The unit should bemounted with
a slight tilt toward the condensing section. This will allow
condensationtodrain easilyfromthe unit.Ifframe railsare
used, be careful not to restrict the condenser air discharge
opening.
Vibration pads are factory installed to the unit base at
the corners and the center balance point.
4.4.
4.4.
4. LOLO
LOLO
LOWW
WW
W TEMPERATEMPERA
TEMPERATEMPERA
TEMPERATURE OPERATURE OPERA
TURE OPERATURE OPERA
TURE OPERATIONSTIONS
TIONSTIONS
TIONS
The Dual compressor heat pump has an OUTSIDE AMBI-
ENT SENSOR. The ambient sensor will allow the heat
pump to operate down to an outside temperature of 24
degrees Fahrenheit. At 24 degrees, the sensor will turn
"OFF"theheatpumpandmakeacircuittothegasfurnace.
The gas furnace will provide heat to the coach as long as
theoutside temperatureremains below24 degrees.When
the outside temperature rises above 34 degrees, the
ambient sensor will switch back to the heat pump mode.
POSSIBLE LOCATIONSPOSSIBLE LOCATIONS
POSSIBLE LOCATIONSPOSSIBLE LOCATIONS
POSSIBLE LOCATIONS
NOTE: THE FINS OF THE CONDENSER COIL SHOULD
FACE THE EXTERIOR OF THE VEHICLE.

4
CLEARANCESCLEARANCES
CLEARANCESCLEARANCES
CLEARANCES
The air conditioning unit clearances depend on:
1. Inlet air access used;
2. Discharge air duct arrangement;
3. Return air duct;
4. Storage compartment location and design.
A one (1) inch clearance is required on three (3) sides of
theairconditioner ifthetop returnisused. When usingthe
side access for return, please allow a minimum of eight (8)
inches for the return air duct. Access to the electrical
connections must be provided when making the installation.
5.5.
5.5.
5. EVEV
EVEV
EVAPORAAPORA
APORAAPORA
APORATION SECTIONTION SECTION
TION SECTIONTION SECTION
TION SECTION
A.A.
A.A.
A. INLET AIRINLET AIR
INLET AIRINLET AIR
INLET AIR
The evaporation section must have free access to
room air. A minimum of 128 square inches of FREE
AREA opening is required. Where the return air must
beprovidedthroughlouversor meshscreen,theFREE
AREA percentage of the material used shall be taken
into consideration when making this determination. An
example of how to determine FREE AREA is included
under "2. CONDENSER SECTION".
B.B.
B.B.
B. GRILLS (See Fig. 3)GRILLS (See Fig. 3)
GRILLS (See Fig. 3)GRILLS (See Fig. 3)
GRILLS (See Fig. 3)
NOTE:NOTE:
NOTE:NOTE:
NOTE: The return air grill must have the same square
surface as the return air duct.
1) For each air conditioning system, there must be a
return grill to bring cabin air back into the unit. There
must also be at least four discharge grills per unit.
2) Return grills must be mounted in front of the evapo-
rator. If this is not possible, make sure there is nothing
blocking the air flow from the grill to the evaporator.
3) The unit must have a return filter between the grill
and the unit. This filter must be accessible for periodic
cleaning.
C.C.
C.C.
C. OUTLET AIR (See Fig. 3)OUTLET AIR (See Fig. 3)
OUTLET AIR (See Fig. 3)OUTLET AIR (See Fig. 3)
OUTLET AIR (See Fig. 3)
The air diffusion system, supplied by the installer, must be
sized to maintain a static pressure at the blower outlet
between .4 and 1.2 inches water column.
Allairhandling ductsmustbeproperlyinsulatedtoprevent
condensation forming on their surface during operation. A
vaporbarrier must alsobe supplied on theouter surface of
the insulation to prevent moisture from traveling through
the insulation and condensing on the cold ductwork.
D.D.
D.D.
D. CONDENSATE DRAINCONDENSATE DRAIN
CONDENSATE DRAINCONDENSATE DRAIN
CONDENSATE DRAIN
A.50dia.holeforcondensatedrainageislocatedbetween
the condenser coils. A 1/4" NPT fitting with tubing may be
added to direct condensation.
NOTENOTE
NOTENOTE
NOTE: Drain fitting and tubing must be used if installed in
a finished compartment.
RETURN SYSTEMRETURN SYSTEM
RETURN SYSTEMRETURN SYSTEM
RETURN SYSTEM
Return to be 6 ft. minimum from floor.
Use wall structure for delivery to basement area.
Return grille must be filtered.
Minimum return required per duct sizing for unit to
performwithinEngineeringspecifications.SeeChartbelow:
DUCTSIZEDUCTSIZE
DUCTSIZEDUCTSIZE
DUCTSIZE MINIMUMMINIMUM
MINIMUMMINIMUM
MINIMUM MAX.MAX.
MAX.MAX.
MAX.
40 IN. 2128 IN. 2189 IN. 2
60 IN. 2128 IN. 2189 IN. 2
Electricalboxaccess required.
Each circuit, 15 AMP HACR
breaker
REGISTERREQUIREMENTSREGISTERREQUIREMENTS
REGISTERREQUIREMENTSREGISTERREQUIREMENTS
REGISTERREQUIREMENTS
REQ.SIZE MIN.QTY.
4 X 6 4
4 X 8 4
4 X 10 4
4 X 12 4
ADDITIONALREQUIREMENTSADDITIONALREQUIREMENTS
ADDITIONALREQUIREMENTSADDITIONALREQUIREMENTS
ADDITIONALREQUIREMENTS:
Damperrequiredinfurnace.
Vibrationisolatorsshouldbeused
ateachmountingpoint.
12 VDC required for Comfort
Controloperation.
INSULATED DUCTINSULATED DUCT
INSULATED DUCTINSULATED DUCT
INSULATED DUCT
Minimum Maximum
40 IN. 260 IN. 2
(3 " depth Min.)
SupplyDuctmustbeinsulated.
SupplyDuctfrom air conditioner
must be equal to or greater
in IN.2as the floor ductwork.
Use45 degree angle oninlets
&outlets
Optionalreturnarea.
May be used in
conjunctionwithside
return.
FIG. 3FIG. 3
FIG. 3FIG. 3
FIG. 3
Condenser air outlet ( X2 in bottom)
Must be isolated from condenser inlet air.
Condenserinletair 2 places.

5
6.6.
6.6.
6. ELECTRICAL WIRINGELECTRICAL WIRING
ELECTRICAL WIRINGELECTRICAL WIRING
ELECTRICAL WIRING
See FIG. 6.
NOTE:NOTE:
NOTE:NOTE:
NOTE: All wiring must comply with the NationalAll wiring must comply with the National
All wiring must comply with the NationalAll wiring must comply with the National
All wiring must comply with the National
Electrical Code or CSA Standard C22.1, CanadianElectrical Code or CSA Standard C22.1, Canadian
Electrical Code or CSA Standard C22.1, CanadianElectrical Code or CSA Standard C22.1, Canadian
Electrical Code or CSA Standard C22.1, Canadian
Electric Code, Part 1; and all local codes.Electric Code, Part 1; and all local codes.
Electric Code, Part 1; and all local codes.Electric Code, Part 1; and all local codes.
Electric Code, Part 1; and all local codes.
A.A.
A.A.
A. GENERALGENERAL
GENERALGENERAL
GENERAL
1. All wiring must be at least 12 AWG.
2. Two independent 15 amp circuits must be supplied to
the air conditioner.
3. Two conductors plus a ground must be provided for
each circuit protected by a 15 amp slow-blow fuse or a
15 amp HACR type circuit breaker.
B.B.
B.B.
B. UNIT LINE VOLTAGE (See Fig. 6)UNIT LINE VOLTAGE (See Fig. 6)
UNIT LINE VOLTAGE (See Fig. 6)UNIT LINE VOLTAGE (See Fig. 6)
UNIT LINE VOLTAGE (See Fig. 6)
1. The 39424 Electrical Control Box, and Comfort control
Center was shipped in a separate package.
2. Locate the unit electrical box. Remove the cover from
the electrical box.
A. Using thefour (4)mounting screws supplied,mount
the electrical box high on a wall within the air
conditioner storage compartment.
B. Each electrical circuit terminal block is marked.
CIR. 1 L1 N GR
CIR. 2 L1 N GR
C. Route two independent 15 amp supply circuits to
theairconditionerelectricalbox.Eachsupplyshould
be marked Cir #1 and Cir #2.
D. Circuit #1 should be wired directly from the coach's
main breaker panel.
E. Circuit #2 should be wired through the on-board
generator.
NOTE:Astandard30amphookupwillnotpowerNOTE:Astandard30amphookupwillnotpower
NOTE:Astandard30amphookupwillnotpowerNOTE:Astandard30amphookupwillnotpower
NOTE:Astandard30amphookupwillnotpower
bothCircuit1andCircuit2andthecoach'sotherbothCircuit1andCircuit2andthecoach'sother
bothCircuit1andCircuit2andthecoach'sotherbothCircuit1andCircuit2andthecoach'sother
bothCircuit1andCircuit2andthecoach'sother
major appliances.major appliances.
major appliances.major appliances.
major appliances.
3. Route field supply Cir. #1 to terminal block Cir. #1.
Attach black "HotHot
HotHot
Hot" to "L1L1
L1L1
L1" terminal. Attach White to "NN
NN
N"
terminal and attach the ground wire to the "GRGR
GRGR
GR" termi-
nal. Route field supply Cir. #2 to terminal block Cir. #2.
AttachBlack"HotHot
HotHot
Hot"to "L1L1
L1L1
L1" terminal. Attach Whiteto "NN
NN
N"
terminal and attach the ground wire to the "GR" termi-
nal.
5. Route the nonmetallic liquid-tight tubing with the two 9-
pin connectors and ground wire to the air conditioning
unit.
6. Remove the field connect junction box cover. Remove
lower vent panel. Place pin connectors Cir. #1 and Cir.
#2 and ground wire through bushing in vent panel.
Movebushingdowntubingaboutfour(4)inches.Install
bushing with tubing in vent panel. Place the tubing into
slot at bottom of the junction box with about 3/4 inches
extending into junction box. Install vent panel using
screws removed.
7. Locateground wireandlocategroundscrewinjunction
box. Attach ground wire to junction box using ground
screw.
8. Locate pin connector for Cir. #2. Insert connector into
receptacle marked Cir. #2. Push the connector into
seat. Pull lightly on connector assuring it is attached.
9. Repeat Step 8 using Cir. #1 connector.
FAILURE TO CORRECTLY WIRE THE UNIT WILLFAILURE TO CORRECTLY WIRE THE UNIT WILL
FAILURE TO CORRECTLY WIRE THE UNIT WILLFAILURE TO CORRECTLY WIRE THE UNIT WILL
FAILURE TO CORRECTLY WIRE THE UNIT WILL
CAUSE PRODUCT DAMAGE AND MAY CAUSE PER-CAUSE PRODUCT DAMAGE AND MAY CAUSE PER-
CAUSE PRODUCT DAMAGE AND MAY CAUSE PER-CAUSE PRODUCT DAMAGE AND MAY CAUSE PER-
CAUSE PRODUCT DAMAGE AND MAY CAUSE PER-
SONAL INJURY.SONAL INJURY.
SONAL INJURY.SONAL INJURY.
SONAL INJURY.
7.7.
7.7.
7. DOMETIC COMFORT CONTROLDOMETIC COMFORT CONTROL
DOMETIC COMFORT CONTROLDOMETIC COMFORT CONTROL
DOMETIC COMFORT CONTROL
CENTER™ & CABLE INSTCENTER™ & CABLE INST
CENTER™ & CABLE INSTCENTER™ & CABLE INST
CENTER™ & CABLE INSTALLAALLA
ALLAALLA
ALLATIONTION
TIONTION
TION
A.A.
A.A.
A. LOCATIONLOCATION
LOCATIONLOCATION
LOCATION
1) If the system is to be used WITHOUTWITHOUT
WITHOUTWITHOUT
WITHOUT a RemoteRemote
RemoteRemote
Remote
Temperature SensorTemperature Sensor
Temperature SensorTemperature Sensor
Temperature Sensor, the proper location of the
Comfort Control CenterComfort Control Center
Comfort Control CenterComfort Control Center
Comfort Control Center™ is very important to
ensure that it will provide a comfortable RV tem-
perature. Observe the following rules when se-
lecting a location:
a) Locate the Comfort Control CenterComfort Control Center
Comfort Control CenterComfort Control Center
Comfort Control Center™ 54"
above the floor.
b) Install the Comfort Control Center™Comfort Control Center™
Comfort Control Center™Comfort Control Center™
Comfort Control Center™ on a
partition, not on an outside wall.
c) NEVERNEVER
NEVERNEVER
NEVER expose it to direct heat from lamps,
sun or other heat producing items.
d) Avoid locations close to doors that lead out-
side, windows or adjoining outside walls.
e) Avoid locations close to supply registers and
the air from them.
2) If the system is to be used WITHWITH
WITHWITH
WITH a RemoteRemote
RemoteRemote
Remote
Temperature SensorTemperature Sensor
Temperature SensorTemperature Sensor
Temperature Sensor in ALLALL
ALLALL
ALL zones, the comfort
control Center may be mounted anywhere that is
convenientinthecoach.Trytoavoidhardtoreach
and hard to see areas.
3) A 3/8" diameter hole will be needed to route the
cable through the wall.
B.B.
B.B.
B. CONTROL CABLE INSTALLATIONCONTROL CABLE INSTALLATION
CONTROL CABLE INSTALLATIONCONTROL CABLE INSTALLATION
CONTROL CABLE INSTALLATION
A 4-conductor telephone cable must be routed from the
electronic control box to the Comfort Control CenterComfort Control Center
Comfort Control CenterComfort Control Center
Comfort Control Center™.
1) Choose the shortest, most direct route to the
Comfort Control CenterComfort Control Center
Comfort Control CenterComfort Control Center
Comfort Control Center™ location selected.
Leave 6" of cable extending through the wall.
2) The cable that should be used is a flat, 4-conduc-
tor telephone cable.
3) The cable must be terminated with a telephone
RJ-11connector.Refertothecrimptool manufac-
turer for crimping instructions. Ensure that the
cable is installed into the connector correctly be-
fore crimping. (See FIG. 4).
FIG. 4FIG. 4
FIG. 4FIG. 4
FIG. 4

6
C.C.
C.C.
C. COMFORT CONTROL CENTER™COMFORT CONTROL CENTER™
COMFORT CONTROL CENTER™COMFORT CONTROL CENTER™
COMFORT CONTROL CENTER™
INSTALLATIONINSTALLATION
INSTALLATIONINSTALLATION
INSTALLATION
1) Carefullyremovethebaseplatefromthe ComfortComfort
ComfortComfort
Comfort
Control CenterControl Center
Control CenterControl Center
Control Center™. This may be accomplished by
inserting a small screwdriver under the tab on the
bottom edge of the front cover and gently prying.
(See FIG. 5).
FIG. 5FIG. 5
FIG. 5FIG. 5
FIG. 5
2) Insert the telephone cable through the hole in the
base plate and mount the plate to the wall with the
two screws provided. Check the alignment to
ensure level installation.
3) Install the control cable RJ-11 connector into the
backoftheComfort Control CenterComfortControlCenter
ComfortControlCenterComfortControl Center
ComfortControlCenter™andgently
press onto the base plate.
4) IfaRemoteTemperatureSensoristobeused,the
connector end must be routed to the electronic
relay board.
5) If a furnace is to be controlled by the system, the
two furnace thermostat leads must be routed to
the electrical control box of the air conditioner that
willcontrol it. Makesure at least15" of thefurnace
thermostat wires extend into the electrical control
box.
6) If an Energy Management System – EMS (load
shed)istobeusedwiththecontrol,twowiresmust
be routed to the electrical control box. The signal
required for this function is a normally open relay
contact. When the EMS calls for the compressor
to shut off, the relay contacts should close. Make
sure that at least 15" of the EMS wires extend into
the electrical box.
7) In the event that other A/C's are to be installed
(additional zones), an additional 4-conductor tele-
phone cable must be routed to the other A/C'sother A/C's
other A/C'sother A/C's
other A/C's.
Makesurethat atleast15"ofthewireextends into
each of the electrical control boxes.
8.8.
8.8.
8. SYSTEM WIRING INSTRUCTIONSSYSTEM WIRING INSTRUCTIONS
SYSTEM WIRING INSTRUCTIONSSYSTEM WIRING INSTRUCTIONS
SYSTEM WIRING INSTRUCTIONS
A.A.
A.A.
A. CONNECTION OF LOW VOLTAGE WIRESCONNECTION OF LOW VOLTAGE WIRES
CONNECTION OF LOW VOLTAGE WIRESCONNECTION OF LOW VOLTAGE WIRES
CONNECTION OF LOW VOLTAGE WIRES
1) Route Remote Temperature Sensor cable, if ap-
plicable, and attach it to the matched color on the
main board.
2) Connect the previously run 12V DC to the red and
blackwires from theconnector onthe main board.
This needs to be done at only one board. Connect
+12V DC to the red wire; –12V DC to the black
wire.
3) Connect previously run furnace thermostat wires
(if applicable) to the blue wires extending from the
main board. The polarity of these connections
does not matter.
4) Connect the previously run Energy Management
System wires (if applicable) to the yellow wires
extending from the main board. The polarity of
these wires does not matter.
5) Terminate the 4-conductor telephone cables. The
cable(s) must be terminated with a telephone
RJ-11connector.Refertothecrimptool manufac-
turer for crimping instructions. Ensure that the
cable is installed into the connector correctly be-
fore crimping.
6) Plug the telephone cable(s) into one of the tele-
phone jack(s) protruding through the electrical
box. (It does not matter which one.)
9.9.
9.9.
9. SYSTEM CHECKOUT &SYSTEM CHECKOUT &
SYSTEM CHECKOUT &SYSTEM CHECKOUT &
SYSTEM CHECKOUT &
CONFIGURACONFIGURA
CONFIGURACONFIGURA
CONFIGURATIONTION
TIONTION
TION
Now that the system is installed, it is necessary to check
all operations and then configure the electronics.
Refer to the Operating Manual for a description of the air
conditioner operation.
SYSTEM CHECKOUTSYSTEM CHECKOUT
SYSTEM CHECKOUTSYSTEM CHECKOUT
SYSTEM CHECKOUT: Verify that all features of the
installed system work. Check fan speeds, cooling
mode, furnace (if connected) and heat pump. If the
features do not work, check all wiring and confirm that
the correct options have been selected on the Elec-
tronic Control Box.
SYSTEM CONFIGURATIONSYSTEM CONFIGURATION
SYSTEM CONFIGURATIONSYSTEM CONFIGURATION
SYSTEM CONFIGURATION: If all features are func-
tioning,performthefollowingconfigurationprocedure:
Simultaneously depress UP and DOWN
pushbuttons on the Comfort Control Center for at
least one second. This completes the system
configuration.
FOR COMPLETE COMFORT CONTROL CENTER OP-FOR COMPLETE COMFORT CONTROL CENTER OP-
FOR COMPLETE COMFORT CONTROL CENTER OP-FOR COMPLETE COMFORT CONTROL CENTER OP-
FOR COMPLETE COMFORT CONTROL CENTER OP-
ERATING INSTRUCTIONS, REFER TO FORM NO.ERATING INSTRUCTIONS, REFER TO FORM NO.
ERATING INSTRUCTIONS, REFER TO FORM NO.ERATING INSTRUCTIONS, REFER TO FORM NO.
ERATING INSTRUCTIONS, REFER TO FORM NO.
3106705.XXX.3106705.XXX.
3106705.XXX.3106705.XXX.
3106705.XXX.

7
10.10.
10.10.
10. ADDITIONAL FEAADDITIONAL FEA
ADDITIONAL FEAADDITIONAL FEA
ADDITIONAL FEATURETURE
TURETURE
TURE
A circuit for the furnace blower motor has been added to
enhance both the cooling and heating operation.
NOTE: This circuit will not work with all furnaces.NOTE: This circuit will not work with all furnaces.
NOTE: This circuit will not work with all furnaces.NOTE: This circuit will not work with all furnaces.
NOTE: This circuit will not work with all furnaces.
Before using this circuit, check with the furnace manufac-
turer for proper wire connection to the furnace. Other
components may or may not be required. Read and follow
the instructions provided with the furnace.
INSTRUCTIONS FOR FURNACEINSTRUCTIONS FOR FURNACE
INSTRUCTIONS FOR FURNACEINSTRUCTIONS FOR FURNACE
INSTRUCTIONS FOR FURNACE
CONNECTIONS:CONNECTIONS:
CONNECTIONS:CONNECTIONS:
CONNECTIONS:
THE FOLLOWING FURNACE CONNECTIONTHE FOLLOWING FURNACE CONNECTION
THE FOLLOWING FURNACE CONNECTIONTHE FOLLOWING FURNACE CONNECTION
THE FOLLOWING FURNACE CONNECTION
INSTRUCTIONS ONLY PERTAIN TO ONEINSTRUCTIONS ONLY PERTAIN TO ONE
INSTRUCTIONS ONLY PERTAIN TO ONEINSTRUCTIONS ONLY PERTAIN TO ONE
INSTRUCTIONS ONLY PERTAIN TO ONE
SPECIFIC FURNACE MANUFACTURER,SPECIFIC FURNACE MANUFACTURER,
SPECIFIC FURNACE MANUFACTURER,SPECIFIC FURNACE MANUFACTURER,
SPECIFIC FURNACE MANUFACTURER,
AND MAY NOT APPLY TO YOUR INSTAL-AND MAY NOT APPLY TO YOUR INSTAL-
AND MAY NOT APPLY TO YOUR INSTAL-AND MAY NOT APPLY TO YOUR INSTAL-
AND MAY NOT APPLY TO YOUR INSTAL-
LATION.LATION.
LATION.LATION.
LATION.
1. Runa12voltDCpositiveleadtooneoftheblackwires
in the unit electrical box marked "for furnace blower
motoruseonly",andsecurewithanapprovedconnec-
tor.
2. Run a second lead from the furnace blower motor or
terminal board to the remaining black lead in the unit
electrical box. Secure with an approved connector.
11.11.
11.11.
11. MAINTENANCEMAINTENANCE
MAINTENANCEMAINTENANCE
MAINTENANCE
A.A.
A.A.
A. AIR FILTER:AIR FILTER:
AIR FILTER:AIR FILTER:
AIR FILTER: Your air conditioner will operate more
efficiently with a clean filter. Replace the filter with a
new one every three months.
BB
BB
B. To maintain efficient operation, the exposed CON-CON-
CON-CON-
CON-
DENSER COILDENSER COIL
DENSER COILDENSER COIL
DENSER COIL should be cleaned as often as neces-
sary to keep it free of dirt and debris. Be careful not to
damage the coil fins when cleaning.
12.12.
12.12.
12. SERSER
SERSER
SERVICINGVICING
VICINGVICING
VICING
If service work is needed, contact your dealer or the
nearest authorized service center. When requesting ser-
vice, always give complete model and serial numbers.
These numbers are located on the left side of the con-
denser bulkhead.
BEFORE YOU CONTACT A SERVICEMAN:BEFORE YOU CONTACT A SERVICEMAN:
BEFORE YOU CONTACT A SERVICEMAN:BEFORE YOU CONTACT A SERVICEMAN:
BEFORE YOU CONTACT A SERVICEMAN:
There are several built-in features that may automatically
shut off the unit under abnormal conditions. If your unit
should shut off, here are some things you should check
before you contact a service center:
A. Wait 15 to 30 minutes to see if unit will resume
operation.
B. Check thermostat to see if it is properly set.
C. Check fuses on electrical supply in the vehicle.
D. Check the filter (indoor section) to see if it is clean.
E. Check the condenser coil to be sure it is clean.
(Continued on next page . . .)

8
FIG. 6FIG. 6
FIG. 6FIG. 6
FIG. 6
JUNCTION BOX
CIR 1
CIR 2
9-PIN
PLUGS
TO COMPR
& FAN CIR
1
TO COMPR
& FAN CIR
2
GROUND
SCREW
BUSHING
(PLASTIC
CONDUIT)
TO
ELEC.
BOX
HR2HR2
HR2HR2
HR2
HR1HR1
HR1HR1
HR1

9
WIRING DIAGRAMWIRING DIAGRAM
WIRING DIAGRAMWIRING DIAGRAM
WIRING DIAGRAM