Dometic 3241.301 Manual

Important: These Instructions must
stay with unit. Owner read carefully.
INSTALLATION & OPERATING
INSTRUCTIONS
Type
3241.301
3242.301
SERVICE OFFICE
Dometic, LLC
For Information
Contact:
www.dometic.com
REVISION
Form No. 3312937.018 5/10
(Replaces 3312937.000)
©2010 Dometic, LLC
LaGrange, IN 46761
Note: Air Distribution Box installation requires a #2 Phillips screwdriver
with a 7 mm maximum diameter x 35 mm minimum length.
RECORD THIS UNIT INFORMATION
FOR FUTURE REFERENCE:
Type Number
Product Number
Serial Number
ADB Number
ADB Serial Number
Date Purchased
This manual must be read and
understood before installation,
adjustment, service, or mainte-
nance is performed. This unit must
be installed by a qualied service
technician. Modification of this
product can be extremely hazard-
ous and could result in personal
injury or property damage.
Roof Top Unit
Description Model Type Use With Air Distribution Box
Model Control
Air Conditioner
W/Electric Heat
B3200 3241 3310895.028 Integral Mechanical
Heat Pump B3200 3242 3311669.018 Integral Mechanical

2
SAFETY INSTRUCTIONS
This manual has safety information and instruc-
tions to help users eliminate or reduce the risk
of accidents and injuries.
RECOGNIZE SAFETY INFORMATION
This is the safety-alert symbol. When you see this
symbol in this manual, be alert to the potential
for personal injury.
Follow recommended precautions and safe op-
erating instructions.
UNDERSTAND SIGNAL WORDS
A signal word , WARNING OR CAUTION is used
with the safety-alert symbol. They give the level
of risk for potential injury.
indicates a potentially hazard-
ous situation which, if not avoided, could result
in death or serious injury.
indicates a potentially hazard-
ous situation which, if not avoided, may result in
minor or moderate injury.
used without the safety alert
symbol indicates, a potentially hazardous situa-
tion which, if not avoided, may result in property
damage.
Read and follow all safety information and in-
structions.
GENERAL INFORMATION
A. Product features or specications as described or il-
lustrated are subject to change without notice.
B. This Air Conditioner/Heat Pump (hereinafter referred
to as the "unit" Is Designed For:
1. Installation on a Caravan during or after the time
the Caravan is manufactured.
2. Mounting on the roof of a Caravan.
3. Roof construction with rafters/joists support frames
on minimum of 406 mm centers.
4. Minimum of 25 mm and maximum of 140 mm
distance between roof to ceiling of Caravan.
C. Basic Requirements
1. Installation opening. Cut through the roof and ceil-
ing.
2. 220-240 VAC, 50 Hz. 10 Amp.
3. Power when the unit starts must be above 198 VAC
and the frequency must be 50 Hz at all times.
D. The ability of the air conditioner to maintain the de-
sired inside temperature depends on the heat gain of
the Caravan.
Some preventative measures taken by the occupants
of the Caravan can reduce the heat gain and improve
the ability of the air conditioner to cool the Caravan.
During extremely high outdoor temperatures, the heat
gain of the Caravan may be reduced by:
1. Parking the Caravan in a shaded area
2. Using window shades (blinds and/or curtains)
3. Keeping windows and doors shut or minimizing
usage
4. Avoiding the use of heat producing appliances
Operation on High Fan/Cooling mode will give optimum
or maximum efciency in high humidity or high outside
temperatures.
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.
For a more permanent solution to high heat gain, ac-
cessories like an outdoor patio and window awning will
reduce heat gain by removing the direct sun. They also
add a nice area to enjoy company during the cool of
the evening.
E. Condensation
Note: The manufacturer of this unit will not be responsible
for damage caused by condensed moisture on ceilings or
other surfaces. Air contains moisture and this moisture
tends to condense on cold surfaces. When air enters the
Caravan, condensed moisture may appear on the ceiling,
windows, metal parts, etc. The air conditioner removes
this moisture from the air during normal operation. Keep-
ing doors and windows closed when this air conditioner
is in operation will minimize condensed moisture on cold
surfaces.

3
A. Precautions
INSTALLATION INSTRUCTIONS
B. Choosing Proper Location For The Unit
This unit is specically designed for installation on the roof
of a Caravan. When determining your cooling requirements,
the following should be considered:
• Size of Caravan;
• Window area (increases heat gain);
• Amount of insulation in walls and roof;
• Geographical location where the Caravan will be
used;
• Personal comfort level required.
1. Normal location-The unit is designed to t over an
existing roof vent opening.
2. Other locations - When no roof vent is available or
another location is desired, the following is recom-
mended:
a. For one unit installation: The unit should be
mounted slightly forward of center (front to
back) and centered from side to side.
b. For two unit installations: Install one unit 1/3
and one unit 2/3’s from front of Caravan and
centered from side to side.
1/2L LL
1/3L
2/3L
FIG. 1
It is preferred that the unit be installed on a relatively at
and level roof section measured with the Caravan parked
on a level surface, but up to a 8° tilt is acceptable.
3. After location has been selected:
a. Check for obstructions in the area where unit
will be installed. See FIG. 2.
Improper installation may damage equipment,
could endanger life, cause serious injury and/
or property damage.
1. Read Installation and Operating Instructions care-
fully before attempting to start this unit installa-
tion.
2. The manufacturer will not be liable for any dam-
ages or injury incurred due to failure in following
these instructions.
3. The equipment shall be installed in accordance
with national wiring regulation per IEC 335-2-40, CI,
7.12.1. Installation must comply with all applicable
codes and/or regulations.
4. DO NOT add any devices or accessories to this
unit except those specically authorized in writing
by Dometic, LLC.
5. This equipment must be serviced by qualied
personnel and some localities require these people
to be licensed.
* The manufacturer gives GENERAL guidelines for genera-
tor requirements. These guidelines come from experiences
people have had in actual applications. When sizing the
generator, the total power usage of your Caravan must be
considered. Keep in mind generators lose power at high
altitudes and from lack of maintenance.
Specications
Type 3241 3242
A/C OR H/P A/C H/P
Nominal Cooling
Capacity (KW)
3.0 3.0
Electric Heat
Capacity (KW)
1.6 N/A
Electrical Rating 220 - 240 VAC 50 Hz., 1 Ph
Full Load Amps
(Compressor / Motor)
5.46 / .92 5.46 / .92
Locked Rotor Amps
(Comp / Motor)
27 / 2.3 27 / 2.3
Power (KW)
Compressor + Motor
1.34 1.33
Power (KW)
Heater
1.5 N/A
Refrigerant R410A
Grams / Oz.
525 / 18.5 695 / 24.5
Minimum Wire Size Up to 8 meters use 1.5 mm2, Copper.
Consult Regulatory Codes.
Circuit Protection 10 Amp Time Delay Fuse,
or Circuit Breaker
* Generator Size 1 Unit - 3.5 KW
2 Unit - 5.0 KW
FIG. 2
241 mm
737 mm
1016 mm
Dimensions Are Nominal
Keep These Areas
Free Of Obstructions
305 mm
102 mm 102 mm
Dimensions Are Nominal
362 mm x 362 mm
(± 3 mm) Opening
Front

4
b. The roof must be designed to support 65
Kg. when the Caravan is in motion. Normally
a 100 Kg. static load design will meet this
requirement.
c. Check inside the Caravan for air distribution
box obstructions (i.e. door openings, room
dividers, curtains, ceiling xtures, etc.). See
FIG. 3.
FIG. 4
C. Roof Preparation
1. Opening requirements - Before preparing the ceil-
ing opening, read all of the following instructions
before beginning the installation.
If an existing roof vent opening will not be used
a 362 mm x 362 mm (± 3 mm) opening must be
cut through the roof and ceiling of the Caravan.
This opening must be located between the roof
reinforcing members.
It is the responsibility of the installer of this
system to ensure structural integrity of the
Caravan roof. Never create a low spot on the
roof where water will collect. Water standing
around the unit may leak into the interior
causing damage to the product and the Cara-
van.
There may be electrical wiring between the
roof and the ceiling. Disconnect 220 - 240
VAC power cord and the positive (+) 12 VDC
terminal at the supply battery. Failure to follow
this instruction may create a shock hazard
causing death or severe personal injury.
FIG. 3
Dimensions Are Nominal
Dimensions Are Nominal
70 mm
(overall
depth)
635 mm
508 mm
Front
76 mm
125 mm
130 mm
76 mm
362 mm x 362 mm
(± 3 mm) Opening
152 mm
139 mm
75 mm
233 mm
The 362 mm x 362 mm (± 3 mm) opening is part
of the return air system of the unit and must be
nished in accordance with all applicable national
and local codes and/or regulations.
2. Roof vent removal
a. Unscrew and remove the roof vent.
b. Remove all caulking compound around open-
ing.
c. Seal all screw holes and seams where the roof
gasket will be located. Use a good grade of all
weather sealant. See FIG. 4
d. If the opening exceeds 365 mm x 365 mm, it
will be necessary to re-size the opening to 362
mm x 362 mm (± 3 mm).
e. If the opening is less than 359 mm x 359 mm,
it must be enlarged to 362 mm x 362 mm (± 3
mm).
3. New opening - (Installation other than vent open-
ing)
a. Mark a 362 mm x 362 mm (± 3 mm) square
on the roof and carefully cut the opening.
b. Using the roof opening as a guide, cut the
matching hole in the ceiling.
c. The opening created must be framed to provide
adequate support and prevent air from being
drawn from the roof cavity. Framing stock 19
mm or more in thickness must be used. Re-
member to provide an entrance hole for power
supplies at the front of the opening. See FIG.
5.

5
It is the responsibility of the installer of this
system to ensure structural integrity of the
Caravan roof. Never create a low spot on the
roof where water will collect. Water standing
around the unit may leak into the interior
causing damage to the product and the Cara-
van.
D. Wiring Requirements
1. 220 - 240 VAC Supply Wire
Route a copper, with ground, 220 - 240 VAC sup-
ply wire from the time delay fuse or circuit breaker
box to the roof opening. The proper size wire can
be determined from chart on page 3.
Note: If vent fan was removed, the existing wire may be
used provided it is of proper size, location and correctly
fused.
a. This supply wire must be located in the front
portion of the 362 mm x 362 mm (± 3 mm)
opening.
b. The power MUST be on an appropriately sized
separate time delay fuse or circuit breaker. The
proper protection can be determined from chart
on page 3.
c. Make sure that at least 381 mm of supply wire
extends into the roof opening. This ensures an
easy connection at the junction box.
d. Wiring methods must comply with all national
and local wiring codes and/or regulations.
e. Protect the wire where it passes into the open-
ing with approved method. See paragraph "d"
above.
Note: These power supply connections may be replaced
with type Y attachments if done by qualied personal.
This unit weighs approximately 45 Kilograms.
To prevent back injury, use a mechanical hoist
to place unit on roof.
Do not slide the unit. This may damage the
roof gasket attached to the bottom and may
create a leaky installation.
FIG. 6
FRONT
E. Placing Unit On The Roof
1. Remove the unit from the carton and discard car-
ton.
2. Place the unit on the roof.
3. Lift and place the unit over the prepared opening
using the gasket on the unit as a guide. See FIG.
6.
4. Place the air distribution box kit inside the Caravan.
This box contains mounting hardware for the unit
and will be used inside the Caravan.
This completes the outside work. Minor adjustments can
be done from the inside of the Caravan if required.
F. Installing The Unit
1. Remove air distribution box and mounting hardware
from carton.
2. Check for correct alignment and adjust the unit as
necessary (Roof gasket centers over the 362 mm
x 362 mm (± 3 mm) opening.
3. Reach up into the return air opening and pull the
unit electrical cord and heater cord (if applicable)
down for later connection. See FIG. 7.
FIG. 5
Do Not Cut
Roof Structure
Or Rafters
Good-Rafters
Supported By
Cross Beams
Optional Metal
Frame
Frame Opening So It
Won't Collapse When
Bolting Down Unit
Leave Access For
Power Supply Wiring
381 mm Min. At
Front Of opening
19 mm Min.
FIG. 7 ReachInTheReturnAirOpening,
Pull Down The Unit Electrical
Cords
Lift And Place
Do Not Slide

6
FIG. 11
Install 2 Screws In Tabs
Duct Adapter Screw
Holes Must Line Up
If Necessary Rotate
1/2 A Turn.
Fit DuctAdapter
Inside Duct
If bolts are left loose there may not be an ad-
equate roof seal or if over tightened, damage
may occur to the unit base or ceiling template.
Tighten to torque specications listed in this
manual.
d. EVENLY TIGHTEN MOUNTING BOLTS TO A
TORQUE OF 4.5 TO 5.6 NM (Newton Meters).
This will compress the roof gasket to approxi-
mately 13 mm. The bolts are self locking so
further tightening is not necessary. See FIG.
10.
6. Template/Duct adapter
a. Pull duct down through the template open-
ing.
b. Cut the duct 13 mm to 25 mm below the tem-
plate opening. See FIG. 10.
c. Align the template duct adapter with the tem-
plate duct hole making sure the screw holes
line up (if not, rotate 1/2 turn). Insert template
duct adapter into duct. Leave one loop of wire
below the duct adapter groove. Do not insert
adapter tabs inside the duct.
d. Snap duct adapter into template and install 2
screws through the duct adapter tabs into the
ceiling template. See FIG. 11.
3 Pin Heater Connector
(If Electric Heat Installed)
FIG. 9
9 Pin Connector
Control Box
Return Air
Opening
Discharge
Opening
Remove Liner
From Foam
Tape
Front
FIG. 8
Screw
FIG. 10
Start 3
Mounting
Bolts By
Hand
Trim Duct 13 mm To
25 mm Below Ceiling
Template
Ceiling
Template
Do Not Disturb
Thermostat Bulb
Mounting Bolt
Mounting Bolt
4. Base Pan Duct Adapter
a. Remove the liner from the foam tape and posi-
tion on the base so screw hole and air openings
are aligned. Place ange of duct on right hand
side when facing front. See FIG. 8.
b. Install # 10 screw to help hold the duct adapter
to base pan if desired.
5. Ceiling template installation
Note: The large center hole in the ceiling template goes
to the rear. Insure that the thermostat bulb is not moved
during installation. See FIG. 10.
a. Plug the nine pin cord from the unit and three
pin (if available on unit) heater cord into the
control box on the ceiling template. See FIG.
9.
b. Route the previously run 220 - 240 VAC power
supply wire into the junction box on the ceiling
template.
c. Start each mounting bolt by hand before tight-
ening them. The 3 threaded inserts in the base
pan can be seen to aid in starting the bolts. See
FIG. 10.

7
Disconnect 220 - 240 VAC. Failure to follow
these instructions could create a shock haz-
ard causing death or severe personal injury.
FIG. 12
Terminal
Block
G. Wiring The System
Important: The electrical installation must be done
by an authorized electrician. In some areas electricians
must be licensed.
1. 220 - 240 VAC power supply connection
a. Connect the power supply line to the unit at
the terminal block provided in the junction box.
Connect to red, black and green/yellow wire
(Active, Neutral and respectively). See FIG.
12.
FIG. 13
Snap Cover
In Place After
Wires Are
Connected
Install
Screw
FIG. 14
Position
ADB Walls
Inside And
Against End
Of Template
Walls
Raise Back
End Of ADB
To Ceiling
Push Here To Engage
Latches, Then Remove Labels
Auxiliary Screw Locations
Auxiliary Screw
Locations
FIG. 15
Install 2 Primary
Mount Screw First
Strain
Relief
b Tighten the strain relief onto the power supply
line to hold rmly in place. Be careful not to
damage wires. See FIG. 12.
c. Carefully push all excess wire back into the
junction box. Place cover edge under tabs and
snap cover in place and secure with screw.
See FIG. 13.
H. Air Distribution Box Installation
Important: The inner walls of the ADB go inside the
walls of the ceiling template during installation.
1. Working from the rear looking forward with the
rear tipped down 80 mm place the air distribution
box inner walls against the inside of the template
walls. Pull the air distribution box backwards until
it touches the template. Raise the air distribution
box to the ceiling. See FIGS. 14 & 15.

8
2. Push up on the ADB at the locations indicated
by the paper labels to engage the snap locks.
There will be a quiet click heard when each latch
engages.
3. Hold the air distribution box to the ceiling with one
hand and install two coarse threaded 3.5 mm X 19
mm sharp pointed screws in the location shown
in FIG. 15. Do not use electric driver as you may
strip the holes in the plastic.
4. Auxiliary screws may be installed at the locations
shown. These are NOT required to secure the ADB
to the template, but may be desired for aesthetic
purposes in some ceiling geometries. See FIG. 15.
Again, do not use an electric driver as you may
over tighten the screws.
5. Filter installation. Slide lters into slots in air dis-
tribution box. The outward curved side of the lter
handle faces the ceiling. See FIG. 19.
6. Knob installation. Install the two knobs provided
on the ends of the thermostat and selector switch
shafts. Align slot in the knob with the alignment
post on shaft and push into position.
7. The power supply to the unit may now be turned
"ON".
8. Your unit is now installed and ready for operation.
Read the following operating instructions before
attempting to run the unit.
OPERATING INSTRUCTIONS
A. Controls
1. The selector switch has ten positions including
"OFF". This controls fan speed, heating mode,
and cooling modes. See FIG. 16.
2. The thermostat controls the compressor ON/OFF
operation for a temperature range from approx.
18.5° C to 32.5° C at the ADB inlet depending on
the knob position. See FIG. 16.
Important: When the unit is turned on and the ther-
mostat calls for cooling, the compressor will start.After
shutting the unit down manually by either the selec-
tor switch or the thermostat, always wait 2-3 minutes
before turning on the unit. This allows the refrigerant
pressures in the unit system to equalize so the com-
pressor may restart.
B. Cooling Operation (Blue Graphic)
1. Set the thermostat at the desired temperature level.
See FIG. 17.
2. Select the fan speed that best satises your
needs:
a. HIGH COOL: Selected when maximum cool-
ing and dehumidication required.
b. MED COOL: Selected when normal or average
cooling required.
c. LOWCOOL: Selecttomaintain roomatdesired
comfort level. Normally this speed is used for
night time operation.
The compressor will cycle off when the thermostat is satis-
ed. The fan runs when the compressor is off to help keep
the temperature uniform throughout the Caravan.
C. Fan Only Operation (Gray Graphic)
1. This will circulate the air in your Caravan without
cooling or heating.There are three positions: HIGH
FAN, MED FAN or LOW FAN to select from, de-
pending upon personal choice. See FIG. 17.
D. HeatingOperation(RedGraphic)(HeatStrip
or Heat Pump)
Note:The heat modes of operation will not replace a furnace
for heating your Caravan in cold weather. The intent is to
remove the chill on cool days or mornings.
1. Turn the selector switch to "HEAT".There are three
positions: HIGH FAN, MED FAN or LOW FAN to
select from , depending upon personal choice. See
FIG. 16.
Use low fan speed with the electric heat strips (use
of higher speeds will make the outlet air feel cool,
but all heating speeds deliver the same watts of
electric heat to the Caravan).
2. Theblower will come onimmediately.Theheatfunc-
tion will start if the thermostat is not satised.
3. The compressor, if a heat pump, or element if re-
sistance heat will "cycle off" when the thermostat
is satised. The fan will continue to run helping
keep the temperature throughout the Caravan
uniform.
E. "OFF" Position (Selector Switch )
1. This is to turn unit off.
FIG. 16
Selector Switch Thermostat
Blue Graphic
Cooling
Red Graphic
Heating
FIG. 17 Gray Graphic
Fan
Colder

9
MAINTENANCE
A. Air Filter
1. Periodically (a minimum of every 2 weeks of opera-
tion) slide out the return air lters located on the
end of the air distribution box. Wash the lters with
soap and warm water, let dry and then reinstall.
Note: To insure easy future removal the lters need to be
replaced with the domed side of their handle positioned
towards the ceiling.
Note: Never run the unit without both return air lters in
place.This will plug the unit evaporator coil with dirt and may
substantially degrade the performance of the unit over time.
B. Air Distribution Box Housing
1. Clean air distribution box housing and control panel
with a soft cloth dampened with a mild detergent.
Never use furniture polish or scouring powders.
C. Fan Motor
1. The blower motor is factory lubricated and requires
no service.
D. Frost Formation On Cooling Coil
1. Frost on a small portion of the coil is not unusual.
Under certain conditions, ice may form on the
evaporator coil.This is indicated by very cold output
at very low air speed and the icing can be seen
through the air inlet holes with the lters removed. If
this should occur, inspect the lter and clean if dirty.
Make sure air vents are open and not obstructed.
Units have a greater tendency to frost when the
outside temperature is relatively low. This may be
prevented by adjusting the thermostat control knob
to a warmer setting (counter clockwise). Should
frosting continue, operate on any FAN ONLY setting
until the cooling coil is free of frost; then resume
normal operation. If frost condition persist, contact
your local service center for assistance.
2. On Outdoor Coil While Heating
a. Operation at low outdoor temperatures causes
low coil temperatures. This can result in ice
formingontheout door coil incertainconditions.
This is indicated by reduced heat output and
could fully stop fan rotation in extreme condi-
tions. To avoid this the system controls turn off
the compressor if out door temperature
drops below 5.6° C. and returns heating when
the temperature raises 2.8° C.
SERVICE-UNIT DOES NOT OPERATE
If your unit fails to operate or operates improperly, check
the following before calling your service center.
A. If Caravan connected to motor generator, check to
be sure motor generator is running and producing
power.
B. If Caravan connected to power supply by a land line,
check to be sure line is sized properly to run unit load
and it is plugged into power supply.
C. Check your fuse or circuit breaker to see if it is open.
Insure fuse is not burnt, or circuit breaker is "ON" and
not activated.
D. After the above checks, call your local service center
for further help. This unit must be serviced by qualied
service personnel only.
E. If any wiring or supply cord is damaged and
needs to be replaced, it must be replaced by the
manufacturer or its service agent or a similarly quali-
ed person.
F. When calling for service, always give the following:
1. Unit type and serial number found on identication
label located on base pan of unit bottom. (Remove
lter and view through network of holes)
2. Air distribution box model and serial number found
on rating plate located on ceiling template. Observe
this rating plate through the air distribution box right
side vent opening.
G. Heater Element thermal reset (Type 3241 only) may
be performed by qualied personal with an electrically
insulated probe. See FIG. 18. The unit is disassembled
from above to facilitate this. The unit should be reviewed
at the time of reset to insure air ow is not blocked and
motor is functioning properly. Disconnect the 220 - 240
VAC power supply prior to performing this reset.
Disconnect 220 - 240 VAC. Failure to follow
these instructions could create a shock haz-
ard causing death or severe personal injury.
FIG 18

10
ROOF MOUNT ASSEMBLY
Rear
Air Conditioner/Heat Pump
(AC/HP)
Discharge Duct
Ceiling Template
With Metal Brackets
Mounting Bolts
Air Distribution Box
(ADB)
Roof Opening
FIG. 19
Duct Adapter
Vents
Filter(s)

11
WIRING DIAGRAM
3310895.028 Air Distributation Box Wiring Diagram
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3241 Unit Wiring Diagram

12
WIRING DIAGRAM
3311669.018 Air Distribution Box Wiring Diagram
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3242 Unit Wiring Diagram