Dometic B3300 Series Manual

Read these instructions carefully. These
instructions MUST stay with this product.
TYPE
3341P701
DuraSea Roof Top Air Conditioner
Form No. 3314452.000 7/12
©2012 Dometic, LLC
LaGrange, IN 46761
RECORD THIS INFORMATION FOR FUTURE
REFERENCE:
Model Number
Serial Number
ADB Model Number
ADB Serial Number
Date Purchased
Roof Top Unit
Description Model Type Use With Air Distribution Box (not included)
Model Control
Air Conditioner B3300 3341P 3309278.004 Integral Mechanical
INSTALLATION & OPERATING
INSTRUCTIONS

2
TABLE OF CONTENTS
INTRODUCTION....................................................................................................................................................................2
DOCUMENT SYMBOLS ........................................................................................................................................................3
IMPORTANT SAFETY INSTRUCTIONS................................................................................................................................3
A. Recognize Safety Information ...................................................................................................................................3
B. Understand Signal Words..........................................................................................................................................3
C. Supplemental Directives............................................................................................................................................3
D. General Safety Messages .........................................................................................................................................3
SPECIFICATIONS..................................................................................................................................................................4
A. Table - Unit Data.......................................................................................................................................................4
B. Power Requirements .................................................................................................................................................4
C. Roof Requirements....................................................................................................................................................4
INSTALLATION INSTRUCTIONS ..........................................................................................................................................5
A. Choosing Proper Location For Unit ...........................................................................................................................5
B. Roof Preparation .......................................................................................................................................................5
C. Wiring Requirements .................................................................................................................................................6
D. Placing Unit On Roof .................................................................................................................................................6
E. Installing Unit .............................................................................................................................................................6
F. Wiring System ...........................................................................................................................................................8
G. Air Distribution Box Installation..................................................................................................................................9
OPERATING INSTRUCTIONS.............................................................................................................................................10
A. Controls ...................................................................................................................................................................10
B. “OFF” Position .........................................................................................................................................................10
C. Cooling Operation....................................................................................................................................................10
D. Heating Operation (With Optional Electric Heater Installed) ...................................................................................10
E. Fan Operation..........................................................................................................................................................10
MAINTENANCE ................................................................................................................................................................... 11
A. Air Filter ................................................................................................................................................................... 11
B. Air Distribution Box Housing.................................................................................................................................... 11
C. Fan Motor ................................................................................................................................................................ 11
D. Frost Formation On Cooling Coil ............................................................................................................................. 11
E. Heat Gain ................................................................................................................................................................ 11
F. Condensation .......................................................................................................................................................... 11
SERVICE - UNIT DOES NOT OPERATE.............................................................................................................................12
WIRING DIAGRAMS............................................................................................................................................................12
A. Unit Wiring Diagram ................................................................................................................................................12
B. Air Distribution Box Wiring Diagram ........................................................................................................................12
OWNER'S LIMITED WARRANTY ........................................................................................................................................13
A. What's Covered .......................................................................................................................................................13
B. What's Not Covered ................................................................................................................................................13
C. Coverage Period......................................................................................................................................................14
D. Getting Service ........................................................................................................................................................14
E. Table Of Warranty Periods.......................................................................................................................................15
INTRODUCTION
This air conditioner (hereinafter referred to as “unit,” or “product”) is designed and intended for installation on the roof of a
boat during or after the time the vessel is manufactured.
This unit can be installed by one person with brief help from additional personnel. Use the following procedure to ensure a
properly installed, and properly functioning product.
Dometic, LLC reserves the right to modify appearances and specications without notice.

3
IMPORTANT SAFETY INSTRUCTIONS
This manual has safety information and instructions to help
users eliminate or reduce the risk of accidents and injuries.
A. Recognize Safety Information
This is the safety alert symbol. It is used to
alert you to potential physical injury hazards.
Obey all safety messages that follow this
symbol to avoid possible injury or death.
B. Understand Signal Words
A signal word will identify safety messages and
property damage messages, and will indicate the
degree or level of hazard seriousness.
 indicates a hazardous situation that,
if NOT avoided, could result in death or serious in-
jury.
 indicates a hazardous situation that,
if NOT avoided, could result in minor or moderate
injury.
 is used to address practices NOT
related to physical injury.
C. Supplemental Directives
Read and follow all safety information and
instructions to avoid possible injury or death.
Read and understand these instructions be-
fore [installing / using / servicing / performing
maintenance] on this product.
Incorrect [installation / operation / servicing /
maintaining] of this product can lead to seri-
ous injury. Follow all instructions.
The installation MUST comply with all ap-
plicable ABYC, local or national codes,
including the latest edition of the following
standards:
U.S.A.
●ANSI/NFPA70, National Electrical Code
(NEC)
CANADA
●CSA C22.1, Parts l & ll, Canadian Electri-
cal Code
D. General Safety Messages
 Failure to obey the following warn-
ings could result in death or serious injury:
●This product MUST be [installed / serviced] by a
qualied service technician.
●Do NOT modify this product in any way. Modica-
tion can be extremely hazardous.
●Do NOT add any devices or accessories to this
product except those specically authorized in
writing by Dometic, LLC.
DOCUMENT SYMBOLS
Indicates additional information that is NOT related
to physical injury. Indicates step-by-step instructions.

4
SPECIFICATIONS
A. Table - Unit Data
Type 3341P
A/C OR HP A/C
Nominal Cooling
Capacity (kW) 3.4
Electric Heat
Capacity (kW) 1.6
Electrical Rating 220 - 240 Vac 50 Hz, 1 ph
Full Load Amps
(Compressor / Motor) 5.56 / 1.4
Locked Rotor Amps
(Comp / Motor) 25 / 2.6
Power (kW)
Compressor + Motor 1.38
Power (kW)
Heater 1.6
Refrigerant R410A
Gram / Ounce 822 / 29
Minimum Wire Size Up to 8 meters use 1.5 mm2, Copper.
Consult Regulatory Codes.
AC Circuit Protection
(Installer Supplied)
10 Amp Time Delay Fuse,
or Circuit Breaker
* Generator Size 1 Unit - 3.5 kW
2 Unit - 5.0 kW
Rating Plate 3313169.000
Height 333 mm
Width 759 mm
Depth 886 mm
Weight 46.7 kg
* Dometic Marine gives GENERAL guidelines for genera-
tor requirements. To reduce start-up power draw by up to
65%, consider installing a Dometic SmartStart.
B. Power Requirements
●220 - 240 Vac, 50 Hz, 10 Amp.
●Power when the unit starts must be above 198
Vac and the frequency must be 50 Hz at all
times.
C. Roof Requirements
●A 362 mm x 362 mm (±3 mm) square opening
(hereinafter referred to as “roof opening”) is re-
quired for installing this unit.
●If applicable: Roof construction with rafters/
joists support frames on minimum of 406 mm
centers.
●Minimum of 25 mm and maximum of 102 mm
distance between roof to ceiling.

5
Dimensions Are Nominal
Dimensions Are Nominal
Front
Roof Opening
572 mm
64 mm
508 mm
286 mm 286 mm
70 mm
508 mm
76 mm
286 mm
FIG. 2
B. Roof Preparation
1.  FIRE OR ELECTRICAL SHOCK
HAZARD. Verify there are no obstacles inside
boat’s roof and/or walls (wires, pipes, etc.). Shut
OFF gas supply, disconnect 120 Vac power
from boat, and disconnect positive (+) 12 Vdc
terminal from supply battery BEFORE drilling or
cutting into boat. Failure to obey these warnings
could result in death or serious injury.
2. Carefully mark and cut the required roof open-
ing. See section, "C. Roof Requirements" on
page (4).
3. Using the roof opening as a guide, cut the match-
ing hole in the ceiling.
4.  Maintain structural integrity. Oth-
erwise damage to product and/or boat could
occur.
 NEVER create a low spot on boat
roof. Otherwise, water will pool and could cause
a leak.
The opening created must be framed to pro-
vide adequate support and prevent air from be-
ing drawn from the roof cavity. Framing stock
19 mm or more in thickness must be used.
Remember to provide an entrance hole for
power supplies at the front of the opening. See
(FIG. 3).
INSTALLATION INSTRUCTIONS
A. Choosing Proper Location For Unit
This unit is specically designed for installation on the roof
of a boat. Mount only with front of unit facing the bow (the
vented end should face aft). See (FIG. 4).
When determining your cooling requirements, the following
should be considered:
●Size of boat;
●Window area (increases heat gain);
●Amount of insulation in walls and roof;
●Geographical location where boat will be used;
●Personal comfort level required.
It is preferred that the unit be installed on a relatively at
and level roof section, but up to a 15° tilt is acceptable.
1. After location has been selected:
a. Check for obstructions in the area where unit
will be installed. See (FIG. 1).
Dimensions Are Nominal
Dimensions Are Nominal
Roof Opening
Front
Keep This Area Free Of Obstructions
457 mm
333 mm
886 mm 759 mm
Center Line
Of Unit
FIG. 1
b.  Maintain structural integrity.
Otherwise damage to product and/or boat
could occur.
The roof must be designed to support 60
kg when the boat is in motion. Normally
a 91 kg static load design will meet this
requirement.
c. Check inside the boat’s cabin for air distri-
bution box obstructions (i.e. space for doors
to open, room dividers, curtains, ceiling x-
tures, etc.). See (FIG. 2).

6
381 mm Min. At
Front Of Opening
19 mm Min.
FIG. 3
Do Not Cut Roof
Structure Or
Rafters
Good-Rafters
Supported By
Cross Beams
Good Location-
Between Roof
Rafters
Frame Opening So It
Won't Collapse When
Bolting Down Unit
Leave Access For Power
Supply Wiring
C. Wiring Requirements
1. Route a copper, with ground, 220 - 240 Vac sup-
ply wire from the time delay fuse or circuit break-
er box to the roof opening. The proper size wire
can be determined from chart on page 4.
a. This supply wire must be located in the front
portion of the roof opening.
b. The power MUST be on an appropriately
sized separate time delay fuse or circuit
breaker. The proper protection can be deter-
mined from chart on page 4.
c. Make sure that at least 381 mm of supply
wire extends into the roof opening. This en-
sures an easy connection at the junction box.
d. Protect the wire where it passes into the
opening with approved method.
D. Placing Unit On Roof
1. Remove the unit from the carton and discard
carton.
2.  LIFTING HAZARD. Use proper
lifting technique and control when lifting product.
Failure to obey this caution could result in injury.
Place the unit on the roof.
3.  Do NOT slide unit. Otherwise,
damage to gasket (on bottom of unit) may occur,
and could cause a leak.
Lift and place the unit over the prepared open-
ing using the gasket on the unit as a guide. See
(FIG. 4).
FIG. 4
Front Towards Bow
Lift And Place
Do Not Slide
Front
Rear
4. Place the air distribution box kit (ordered sepa-
rately) inside the boat. This box contains mount-
ing hardware for the unit and will be used inside
the boat.
This completes the outside work. Minor
adjustments can be done from inside the
boat if required.
E. Installing Unit
1. Remove air distribution box and mounting hard-
ware from carton. The upper duct is shipped in-
side the lower duct which is part of the ceiling
template.
2. Check for correct alignment and adjust the unit
as necessary (roof gasket centers over the roof
opening). See (FIG. 5).
Roof Gasket
Center Unit From Below
FIG. 5
3. All models listed in this manual will use a four
(4) bolt pattern for installing the air distribution
box kit.
INSTALLATION INSTRUCTIONS

7
INSTALLATION INSTRUCTIONS
4. Remove upper duct from ceiling template and
locate it over blower discharge.
Edges WITHOUT anges install toward
REAR and SIDE of opening. See (FIG. 6).
FIG. 6
Screw
Front
Lower
Upper Sides Without Tab
To Rear And Side
Of Unit
5. Use two (2) #10 x 10 mm screws to hold duct to
base pan. Screw holes are provided in bottom of
base pan for these screws.
6. Reach up into return air opening of the unit and
pull the unit electrical cord down for later con-
nection. See (FIG. 7).
7. If your installation includes the optional electric
heat kit, install it at this time. Follow the instruc-
tions with the heat package for its installation
procedure.
FIG. 7
Pull Down
Electric Cord
Measure Ceil-
ing Thickness
8. Measure the ceiling to roof thickness:
a. If distance is 25 mm - 51 mm, remove perfo-
rated tabs from both upper and lower ducts.
See (FIG. 7) & (FIG. 8).
FIG. 8
Step a & b
Remove At
Perforation
Step c
Use As
Packaged
Upper Discharge
Air Duct
Lower Discharge
Air Duct
Step a
Remove At
Perforation
b. If distance is 51 mm - 76 mm, remove per-
forated tabs from bottom duct only. See
(FIG. 8).
c. If distance is 76 mm - 102 mm, install ducts
as received. See (FIG. 8).
9. Install ceiling template by sliding lower duct over
upper duct.
10. Hold the ceiling template up to the roof opening.
a. Start each mounting bolt through the ceiling
template and up into the base pan by hand.
See (FIG. 9).
FIG. 9 Mounting
Bolts
Junction
Box
Discharge
Air Duct
Mounting
Bolts
b. Tighten all four (4) bolts until they touch the
template but are not tight.
c. With the ceiling template at against the ceil-
ing install the 6 wood screws (installed sup-
plied) at an angle, so as to stretch and atten
the template. Three (3) across the front and
three (3) across the back of the template.
See (FIG. 10).

8
FIG. 10
Wood
Screws
Knobs
d.  Tighten mounting bolts to
correct torque specications. Overtighten-
ing could damage unit’s base pan or ceiling
template. Not enough torque will allow an in-
adequate roof seal, and could cause a leak.
Tighten all four (4) mounting bolts EVENLY
within 4.5 to 5.6 N·m. See (FIG. 11).
This will compress the roof gasket to
approximately 13 mm.
FIG. 11
Evenly Tighten
The 4 Mounting
Bolts To 4.5 - 5.6
N·M
F. Wiring System
1. 220 - 240 Vac Power Supply Connection
a.  ELECTRICAL SHOCK HAZ-
ARD. Verify 220-240 Vac power is discon-
nected from boat. Failure to obey this warn-
ing could result in death or serious injury.
b.  ELECTRICAL SHOCK HAZ-
ARD. Provide grounding in compliance with
all applicable electrical codes. Failure to
obey this warning could result in death or se-
rious injury.
c. Install Romex connector in junction box. See
(FIG. 13).
d. Route the previously run 120 Vac power sup-
ply wire through Romex connector and into
the junction box. 152 mm leads are suf-
cient for connection to unit wires and ground
screw. See (FIG. 12) & (FIG. 13).
FIG. 12 Corner
Reinforcement
Heater Connection
Unit Electrical
Connection
Discharge Air
Duct
Corner
Nut Retainer
Junction
Box
Mounting
Bolts
Mounting
Bolts
Wood Screw
Thermostat Sensor
Tube Clip
FIG. 13
AC Power Supply
Identied
Earth Screw
Junction Box
Cover Screw
Thermostat
Knob
Heater Connection
(if applicable)
Unit Electrical
Cord
Wood Screw
Romex Connector
e. Connect RED (Active) wire in junction box to
RED wire from supply wire.
f. Connect BLACK (Neutral) wire in junction
box to BLACK wire from supply wire.
g. Connect EARTH wire to identied EARTH
screw in junction box.
h. Tighten the strain relief onto the power sup-
ply wire to hold it rmly in place. Be careful
not to damage the wires.
i. Carefully push all excess wire back into the
junction box and install junction box cover
with two (2) #10 x 10 mm blunt point screws.
See (FIG. 13).
j. Plug heater cord (if applicable) into mating
connector in the control box.
INSTALLATION INSTRUCTIONS

9
INSTALLATION INSTRUCTIONS
k. Plug the unit electrical cord into the mating
connector in the control box. See (FIG. 12).
l. Insure the thermostat sensor tube remains in
the retainer clip. See (FIG. 12).
G. Air Distribution Box Installation
1. Remove return air grille from air distribution box
by pulling in on half-round nger catches. See
(FIG. 14).
FIG. 14
Return Air Grille
Half Round
Catches
2. Hold air distribution box up to ceiling template
and install three (3) #10 x 10 mm screws at air
distribution box mounting point. See (FIG. 15).
FIG. 15
Install 3 Screws In To
Metal Template
3. Snap hole plug into place at rear of air distribu-
tion box. See (FIG. 16).
FIG. 16
Wood
Screw
Hole Plug
Wood
Screw
4. Install four (4) #8 x 16 mm wood screws that
hold air distribution box tight to ceiling. Hand
tighten to prevent stripping of the screw in the
ceiling. Do NOT use a power screw driver. See
(FIG. 16) & (FIG. 17).
FIG. 17
Do Not Use Power Screw Driver To
Tighten Wood Screws
5. Reinstall return air grille and lter into air distri-
bution box.
6. The unit installation is now complete and is
ready for operation. The power supply to the unit
may now be turned on.
7. Verify that all features of the installed system
work. Please read the following operating in-
structions before attempting to run the unit.

10
D. Heating Operation (With Optional
Electric Heater Installed)
This electric heater will NOT replace a fur-
nace for heating your boat in cold weather.
The intent is to remove the chill on cool days
or mornings using a 1.6 kW heater.
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. 18).
2. 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 boat).
3. The heat strip will come on and begin heating.
4. The element will “cycle off” when the thermostat
is satised. The fan will continue to run help-
ing keep the temperature throughout the boat
uniform.
E. Fan Operation
1. This will circulate the air in your boat without
cooling or heating. There are three positions:
HIGH FAN, MED. FAN or LOW FAN to select
from, depending upon personal choice.
A. Controls
1. The Selector Switch has 10 positions including
“OFF”. This controls fan speed, optional heating
mode, and cooling modes. See (FIG. 18).
FIG. 18
2. The thermostat controls the temperature range
at the lter between approximately 18 °C and
32 °C.
B. “OFF” Position
1. This is to turn unit off.
C. Cooling Operation
1. Set the thermostat at the desired temperature
level.
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 aver-
age cooling required.
c. LOW COOL: Selected when room is at de-
sired comfort level and needs to be main-
tained. Normally this speed used for night time
operation.
The blower runs continuously to circu-
late air and maintain an even temper-
ature. The compressor will come on
as cooling is required to maintain the
selected temperature level.
OPERATING INSTRUCTIONS