Dometic Duo-Therm 59146 Manual

1
RECORD THIS INFORMATION FOR FUTURE REFERENCE
BEFORE INSTALLING THE UNIT:
Model Number
Serial Number
Date Purchased
Place of Purchase
INSTALLATION & OPERATING
INSTRUCTIONS
R
637G
CERTIFIED
LR 23565
®
®
MODEL 59146
Roof-Top Heat Pump
used with
Air Distribution Box Kit
THIS UNIT IS DESIGNED FOR OEM OR AFTER MARKET INSTALLATION
ALL INITIAL INSTALLATIONS MUST BE APPROVED BY THE SALES DEPT.
USA
SERVICE OFFICE
The Dometic Corp.
509 So. Poplar St.
LaGrange, IN 46761
[phone]
CANADA
Dometic Dist.
866 Langs Dr.
Cambridge, Ontario
CANADA N3H 2N7
[phone]
For Service Center
Assistance Call:
800-544-4881
This unit must be serviced by an
authorized serviceman. Modifica-
tion of the appliance can be
extremely hazardous and could
lead to serious injury or death.
Cet appareil doit être réparé seule-
ment par un réparateur autorisé.
Modification de l'appareil pourrait
être extrèmement dangereuse, et
pourrait causer mal ou mort.
Form No. 3107882.007 8/97
©1997 The Dometic Corp.
LaGrange, IN 46761
MODEL
59146
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

2
MODEL NO. 59146
Nominal Capacity (BTU/HR) 15,000
Electrical Rating 115 VAC, 60 Hz., 1 PH.
Compressor Rated Load Amps 12.9
Fan Motor Rated Load Amps 2.5
Compressor Locked Rotor Amps 71.0
Fan Motor Locked Rotor Amps 12.8
Power, Cooling (KW) 1.95
SCFM-High Speed Max./Min. 450/300
Refrigerant (R22) oz. 34.5
Minimum Wire Size *12 AWG Copper Up to 24 ft.
Circuit Protection 20 Amp Time Delay Fuse or
HACR Circuit Breaker
Installed Weight (Pounds) 110
Minimum Generator 1 Unit 3.5 KW
Size ** 2 Units 5.0 KW
SPECIFICATIONS
*
** For distances over 24 ft. consult the National Electrical Code.
The Dometic Corporation gives GENERAL guidelines for generator requirements.
These guidelines come from experiences people have had in actual applications.
Whensizingthegenerator,thetotalpowerusagemustbeconsidered.Alsokeepin
mind generators lose power at high altitudes and from lack of maintenance.
1. GENERAL INFORMATION
A. The roof top heat pump was designed to operate
in a MILD GEOGRAPHICAL AREA for heating
where the heat loss is minimum. The Heat Pump
will operate down to an outside ambient tempera-
ture of 40 degrees. At 40 degrees, the outdoor
thermostat will turn off the heat pump circuit. As
long as the temperature remains below 40 de-
grees,themainfurnacewillheatyourhome.Asthe
outside temperature increases to 45 degrees, the
outdoor thermostat switches back to the heat
pump circuit.
The advantages of the Heat Pump Air Conditioner
are:
1) Userfriendly-onlyoneunitforbothheatingand
cooling.
2) When used in mild climates where the outdoor
temperature range is 40 degrees or higher, an
L.P. furnace is not needed.
3) Heat pump heating uses the campsite electri-
calhookup; therefore,you saveon tripsto refill
L.P. tanks.
NOTE: Geographical location usage should be
determined before omitting a central fur-
nace.
B. This air conditioner is designed for:
1) Installation on a recreational vehicle at the time the
vehicle is manufactured or aftermarket installations.
2) Mounting on the roof of a recreational vehicle.
3) Connection to an air distribution box system.
4) Roof construction with rafters/joists on minimum of
16 inch centers.
5) Minimumof1.75inchesandmaximumof4.50inches
distance between roof to ceiling of recreational ve-
hicle. Alternate installation methods will allow for
roofs more than 4.50 inches thick.
6) Readinstallationandoperatinginstructionscare-
fully before starting your air conditioner
installation.
7) The Dometic Corporation will not be liable for any
damagesor injuryincurred dueto failurein following
these instructions.
8) Installation must comply with the National Electrical
Code and any State or Local Codes or regulations.
9) DO NOT add any devices or accessories to this air
conditioner except those specifically authorized by
Dometic.
10) This equipment must be serviced by qualified
personnel and some states require these people
to be licensed.
2. OPERATING INSTRUCTIONS
A. CONTROLS:
1) The Selector Switch controls fan speed, heating
mode, and cooling modes.
2) The thermostatcontrols thecompressor ON/OFF
operation in a temperature range of 65° to 90°F.
B. COOLING OPERATION:
1) Set the thermostat at the desired temperature
level.
2) Selectthefanspeedthatbestsatisfiesyourneeds:
a) HIGH COOL: Selected when maximum cool-
ing and dehumidification required.
b) LOW COOL: Selected when room at desired
comfort level and needs to be maintained.
Normallythis speedused fornight timeopera-
tion.
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

3
NOTE: The blower runs continuously to circulate air and
maintain an even temperature. The compressor will
come on as cooling is required to maintain the se-
lected temperature level.
AFTERSHUTTINGTHEAIRCONDITIONERDOWN
WITH EITHER SELECTOR SWITCH OR THERMO-
STAT, WAIT AT LEAST TWO (2) MINUTES BE-
FORE RESTARTING. THIS ALLOWS THE RE-
FRIGERANTPRESSURETOEQUALIZEANDCOM-
PRESSOR TO RESTART EASILY. FAILURE TO
FOLLOW THIS INSTRUCTION MAY CAUSE CIR-
CUIT BREAKER OR FUSE TO OPEN.
C. FAN OPERATION:
This will circulate the air in your RV without cooling or
heating. Therearetwo positions: HIGHFANorLOW
FAN to select from, depending upon personal choice
and model.
D. HEATING OPERATION:
NOTE: The heat pump will not replace a furnace for
heating your RV in cold weather. The intent is to
warm the coach during mild winter weather.
1) Turn the selector switch to:
a) High heat
b) Low heat
2) Set the thermostat to your comfort level.
3) The fan and compressor will come on and begin
heating.
4) When the desired temperature level is reached,
the compressor will cycle as required to main-
tain selected temperature. The blower will run
continuously to circulate air and maintain an
even temperature.
E. "OFF" POSITION: This is to turn Unit off.
3. MAINTENANCE
A. AIR FILTER:
Periodically remove the return air filter located above
theremovablepanelintheairbox. Washthefilterwith
soap and warm water, let dry and the reinstall.
NOTE:Neverrun theairconditioner withoutreturnair
filter in place. This may plug the unit evaporator coil
withdirtandmay substantiallyaffect theperformance
of the unit.
B. AIR BOX HOUSING:
Clean air box housing and control panel with a soft
cloth dampened with a mild detergent. Never use
furniture polish or scouring powders.
C. FAN MOTOR:
Factory lubricated and requires no service under
normal use.
D. FROST FORMATION ON COOLING COIL:
Undercertainconditions,frostmayformontheevapo-
rator coil. If this should occur, inspect the filter and
cleanifdirty. Makesureairlouversarenotobstructed.
Airconditionershaveagreatertendencytofrostwhen
theoutsidetemperatureisrelativelylow. Thismaybe
preventedby adjustingthethermostat controlknob to
awarmersetting(counterclockwise). Shouldfrosting
continue, operate on HIGH FAN setting until the
cooling coil is free of frost.
4. REDUCING HEAT GAIN
The ability of the air conditioner to maintain the de-
sired inside temperature depends on the heat gain of
the RV. Some preventative measures taken by the
occupants of the RV can reduce the heat gain and
improve the performance of the air conditioner. Dur-
ing extremely high outdoor temperatures, the heat
gain of the vehicle may be reduced by:
A. Parking the RV in a shaded area
B. Using window shades (blinds and/or curtains)
C. Keeping windows and doors shut or minimizing
usage
D. Avoiding the use of heat producing appliances
Starting the air conditioner early in the morning and
giving it a "head start" on the expected high outdoor
ambient will greatly improve its ability to maintain the
desired indoor temperature.
NOTE
The manufacturer of this air conditioner will not be
responsible for damage caused by condensed mois-
ture on ceilings or other surfaces. Air contains mois-
ture and this moisture tends to condense on cold
surfaces. When air enters the RV, condensed mois-
turemay appearon theceiling, windows,metal parts,
etc. The air conditioner removes this moisture from
the air during normal operation. Keeping doors and
windows closed when this air conditioner is in opera-
tion will minimize condensed moisture on cold sur-
faces.
5. SERVICE - Unit Does Not Operate
If your unit fails to operate or operated improperly,
checkthefollowingbeforecallingyourservicecenter.
A. If RV connected to motor generator, check to be sure
motor generator is running and producing power.
B. IfRV connectedto power supply by aland line,check
to be sure line is sized properly to run air conditioner
load and it is plugged into power supply.
C. Check your fuse or circuit breaker to see if it is open.
D. After the above checks, call your local service center
for further help. This unit must serviced by qualified
service personnel only.
When calling for service, always give the following:
1. Air Conditioner Model and Serial Number found
on rating plate located on base pan of air condi-
tioner bottom.
2. Air Distribution Box Kit Part and Serial Number
found on rating plate located on ceiling template.
Observe this rating plate through the air discharge
louver of Air Distribution Box.
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

4
6. INSTALLATION INSTRUCTIONS
A. PRECAUTIONS
! DANGER
IMPROPER INSTALLATION MAY DAMAGE
EQUIPMENT, COULD ENDANGER LIFE,
CAUSE SERIOUS INJURY AND/OR
PROPERTY DAMAGE.
1) Read Installation and operating instructions care-
fully before starting your air conditioner installa-
tion.
2) The Dometic Corporation will not be liable for any
damages or injury incurred due to failure in follow-
ing these instructions.
3) Installation must comply with the National Electri-
cal Code and any State or Local Codes or regula-
tions.
4) DONOTaddanydevicesoraccessoriestothisair
conditioner except those specifically authorized
by Dometic.
5) This equipment must be serviced by qualified
personnel and some states require these people
to be licensed.
B. CHOOSING LOCATION FOR
THE AIR CONDITIONER
This air conditioner is specifically designed for instal-
lation on the roof of a recreational vehicle (RV).
1) NORMAL LOCATIONS:
The air conditioner is designed to fit over an
existing roof vent opening. When the vent is
removed, it normally creates a 14" x 14" open
ing.
2) OTHER LOCATIONS:
When no roof vent is available or another
locationis desired,thefollowing isrecommended:
For one unit installation: The air conditioner
should be mounted slightly forward of center
(front to back) and centered from side to side.
For two unit installations: Install one air
conditioners 1/3 and one air conditioner 2/3's
from front of RV and centered from side to side.
It is preferred that this air conditioner be installed in a
relatively flat and level roof section measured with the RV
parked on a level surface; however,
a) Up to a 15° slant to either side or front-to-
back is acceptable on 591 Series Heat
Pumps.
3) AFTER LOCATION SELECTION:
a) Check for obstructions in the area where air
conditioner will be installed.
b) The roof must be designed to support 130
pounds when the RV is in motion. Normally a
200lb. staticload designwill meet thisrequire-
ment.
c) Check inside the RV for air box obstructions.
(i.e. door openings, room dividers, curtains,
ceiling fixtures, etc.)
34.4"
12.7"
29.5"
7-3/4"
5-3/8 15"
7-3/4"
REAR
OF
UNIT
11-1/8"
11-1/8"
2-5/8"
4-1/8"
4-1/8"
3-1/8"
KEEP THIS AREA FREE OF OBSTRUCTIONS
19-3/4"
FRONT 14" x 14"
OPENING
18"
19-3/4" 22-1/4"
2-1/2"
14-1/4" X 14-1/4"
OPENING
3107209 AIR
DISTRIBUTION
BOX
3105975 AIR
DISTRIBUTION
BOX
14-1/4" X 14-1/
4"
OPENING
3105975
AIR DISTRIBUTION BOX 3107209
AIR DISTRIBUTION BOX
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

5
C. ROOF PREPARATION
1) ROOF VENT REMOVAL:
a) Unscrew and remove the roof vent.
b) Remove all caulking compound around
opening.
c) Sealallscrewholesandseamswheretheroof
gasketwillbe located. Useagoodgradeofall
weather sealer.
2) NEW OPENING:
(Installations Other Then Vent Openings)
DISCONNECTALLPOWERSUPPLIESANDTHEPOSI-
TIVE(+)TERMINALFORTHESUPPLYBATTERY. FAIL-
URETOFOLLOWTHISINSTRUCTIONMAYCREATEA
SHOCK HAZARD.
a) A14-1/4"x14-1/4"openingmustbecutthrough
the roof and ceiling of the RV. It is recom-
mended this opening be located between roof
reinforcing members.
b) Marka14-1/4"x14-1/4"squareontheroofand
carefully cut the opening.
c) Using the roof opening as a guide, cut the
matching hole in the ceiling.
Theremaybeelectricalwiringbetweentheroofand
ceiling.
3) OPENING PREPARATION:
a) If the opening exceeds 14-1/2" x 14-1/2",
it will be necessary to install spacers.
b) If the opening is less than 14-1/4" x 14-1/4", it
must be enlarged.
c) Route a copper 12 AWG, with ground, supply
line from the fuse or circuit breaker box to the
roof opening.
1. The power supply must be on a separate 20
amp Time Delay Fuse or HACR Circuit
Breaker.
2. Wiring must comply with all National, State
and Local wiring codes.
3. Makesureatleast20"ofwireextendintothe
roof opening. This insures easy air condi-
tioner attachment.
4. If vent fan was removed, the existing wire
maybeusedprovideditisofpropersizeand
correctly fused.
d) The opening must be framed to provide ad-
equate support and prevent air from being
drawnfromtheroofcavity. Lumber3/4"thickor
more and long enough to bridge the opening
must be used. Remember to provide and
entrance hole for the power supply wire.
NEVERcreateaLOWSPOTontheroofwherewaterwill
collect. Waterstandingaroundtheairconditionermay
leak into the RV interior.
e)The 14-1/4" x 14-1/4" roof opening is part of the
return air duct and must be finished in accor-
dance with NFPA standard 501C, Standard for
Recreational Vehicles, Section 2-7.
D. PLACINGTHEAIRCONDITIONERONTHE
ROOF
1) Remove the Air Conditioner from the carton and
discard the carton.
2) Place the air conditioner on the roof.
Use care in lifting.
This unit weighs approximately 100 pounds.
3) Lift and place the unit over the prepared opening
using the gasket as a guide. The condenser coil
goes toward the rear of the RV.
FRAME OPENING SO IT
WON'T COLLAPSE WHEN
BOLTING DOWN AIR
CONDITIONER
LEAVE ACCESS
FOR POWER
SUPPLY WIRING
3/4" MIN.
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

6
GASKET
CENTER A /C
FROM BEL OW
MEASURE
CEILING
THICKNESS PULL DOW N
ELECTRICAL CORD
a)Remove upper duct from ceiling template and
locate it over blower discharge.
NOTE: EdgeswithoutflangesinstalltowardREARand
SIDE of opening.
b)Usetwo(2)sharppointed#10x1/2"sheetmetal
screws (A) to hold duct to base pan. Holes
providedin bottomof basepanfor these screws
to go into.
2) Check for correct alignment and adjust the unit as
necessary (Roof Gasket centers over 14" open-
ing).
3) Reach up into return air opening of the air condi-
tionerandpulltheunitelectricalcorddownforlater
connection.
4) Measure the ceiling to roof thickness:
a)Ifdistanceis1"-2",removeperforatedtabsfrom
both upper and lower ducts.
b)Ifdistanceis2"-3",removeperforatedtabsfrom
bottom duct only.
c) If distance is 3"-4", install ducts as received.
d)If distance is 4"-6", use optional duct adaptor,
Part No. 313606.000 and Bolt Kit, Part No.
3100895.006.
5) Install ceiling template by sliding lower duct over
upper duct.
6) Starteachmountingboltbyhandbeforetightening
any of them. The four (4) threaded inserts in the
base pan can be seen to aid in starting the bolts.
EVENLY TIGHTEN MOUNTING BOLTS TO A
TORQUE OF 40 TO 50 INCH POUNDS.
This will compress the roof gasket to approxi-
mately 1/2". The bolts are self locking so over
tightening is not necessary.
7) Install wood screws (C) in each end of ceiling
templateandintojunctionbox. Thisinsuresatight
fit of air box to ceiling.
F. CONNECTION OF POWER SUPPLY
NOTE: All wiring must comply with the National
Electrical Code and any State or Local Codes
or regulations.
1) Route supply line into junction box thru provided
RomexConnector. Six(6)inchleadsaresufficient
for connection to unit wires and ground screws.
UPPER SIDE WITHOUT
TAB T O R EAR A N
D
SIDE OF A IR
CONDITIONER
A
A
LOWER
FRONT O F
COACH
! CAUTION
DONOTslidetheunit. Thismaydamagetheneoprene
gasket attached to the bottom and create a leaky
installation.
4) Place the Air Box Kit inside the RV. This box
contains mounting hardware for the air condi-
tioner and will be used inside the RV.
This completes the outside work. Minor adjustments can
be done from the inside if required.
E. DISCHARGE DUCT AND CEILING
TEMPLATE
1) Remove air box and mounting hardware from
carton. Theupperductisshippedinsidethelower
duct which is part of the ceiling template.
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

7
DISCHARGE A IR
DUCT
FRONT OF
COACH
MOUNTING
BOLT (B)
CORNER NUT
RETAINER
WOOD SCREW
(C)
MOUNTING
BOLT (B)
CORNER
REINFORCEMENT
(TYP.) MOUNTING BOLT (B)
WOOD SCREW (C)
MOUNTING BOLT
(B)
S
UNIT
JUNCTION
BOX
UNIT
ELECTRICAL
CORD
2) Connect white wire in junction box to white or
neutral wire from supply line.
3) Connect black wire in junction box to black or hot
wire from supply line.
4) Connect supply ground wire to identified ground
screw in junction box.
5) Install junction box cover with two (2) blunt point
screws.
6) Plug unit electrical cord into the mating connector
on control box.
G. INSTALL AIR BOX
3105975 AIR DISTRIBUTION BOX:
1) Removereturn airgrillefromair box bypullingout
on push/pull fasteners.
2) Install air box over two (2) weld studs on ceiling
template and secure with nuts (G).
3) Install machine screw (F) in round air box hole.
4) Install four (4) wood screws (C) that hold air box
tight to ceiling.
5) Reinstall return air grille and snap cover plate (H)
into air box.
6) The air conditioner installation is now complete.
Turn on power to the unit for operational check.
Please read Unit Operating Instructions before
proceeding.
3107209 AIR DISTRIBUTION BOX:
1) Remove return air grille from air box by pulling in
on half-round finger catches.
2) Holdairboxuptoceilingtemplateandinstallthree
(3) #10 x 3/8" screws at air box mounting point.
3) Snap hole plug (E) into place at rear of air box.
4) Install four (4) wood screws (B) that hold air box
tight to ceiling if so desired.
5) Reinstall return air grille and filter into air box.
6) The air conditioner installation is now complete.
Turn on power to the unit for operational check.
Please read Unit Operating Instructions before
proceeding.
3105975 AIR DISTRIBUTION BOX 3107209 AIR DISTRIBUTION BOX
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

8
(Continued on Page 9)
WOOD SCR EW (C)
MACHINE
SCREW (F )
COVER P LATE (H)
PUSH/PULL
FASTENERS
RETURN AIR GR ILLE
WOOD
SCREW (C)
NUT (G)
WOOD SCR EW (C)
CEILING TEMPLATE
WELD STUDS
WOOD SCR EW (C)
3105975 AIR DISTRIBUTION BOX 3107209 AIR DISTRIBUTION BOX
A. (2) #10 x 1/2" long sharp point sheet metal screws.
B. (4) 1/4" — #20 x 7" bolts
C. (7) #8 x 5/8" long sharp point wood screws
D. (4) #10 x 3/8" blunt point tapping screws
E. (1) Romex connector
F. (1) Machine screw, 3/8" long
G. (2) #10 — 24 Hex nuts
H. Cover plate
MOUNTING PARTS
B. (4) #8 x 5/8" long sharp point wood screws
D. (1) Romex connector
E. (1) Hole Plug
MOUNTING PARTS
A. (4) 1/4" - 20 x 7" Bolts
C. (4) #10 x 3/8" blunt point tapping screws
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

9
AIR CONDITIONING UNIT
ELECTRICAL BOX WIRING DIAGRAM
GRN/YEL
ELEC CONN
FROM A/C
3106006.004
THERMOSTAT
BLU
3
2
1
BLU
CONDUCTORS
USE COPPER
60 HZ 1 PH
ONLY
115 VAC
GRY
SWITCH
ROTARY
5
6
2
3
4
RED
YEL
BLK
H
C
L1
1
BLK
FIELD WIRING
FACTORY WIRING
LINE SPLICE
WHT
BLK
AIR BOX WIRING DIAGRAM
AIR BOX PERMANENT
WIRING IN
ROOF OR
RACEWAY
CORD SET
(Type SJOW -A
or Equivalent,
Must be V isible)
UNIQUE PLUG
JUNCTION
BOX
UNIQUE
RECEPTACLE
SO N O O THER
PLUG M AY B E
PUT I NTO T HIS
CIRCUIT
AIR CONDIT IONER
H. INSTALLATION ON TENT CAMPER
ROOF
1) The permanent wiring leading to unit junc-
tion box may originate in a flanged surface
inlet located in roof section near the side
wall.
2) A unique outlet receptacle for air condi-
tioner should be located in the side wall of
vehicle beneath the flanged surface inlet.
3) Acord setfabricatedfrom anoil,water, and
ozone resistant material, such as Type
SJOW-A, shall be used to connect the
flanged surface inlet and the air condition-
ingreceptacle. Thiscordsetshallbevisible
during use and shall not be installed in
raceways or placed behind walls or cabinet
panels.
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

This Manual is Compliments of
Northwest RV Supply
86325 College View Road
Eugene, OR 97405
Local: 541-746-9092
Toll-Free: 866-678-7467
Fax: [phone]
http://www.nwrvsupply.com
[e-mail]
Northwest RV Supply carries a large spectrum of surplus, used, and new
RV parts and components. Please feel free to visit our website for
additional information.
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com