Dometic DuraSea DCA36D Installation manual

COPYRIGHT © 2013-2017 Dometic Corporation. All Rights Reserved.
No part of this publication may be reproduced, translated, stored in a retrieval system, or transmitted in any form or by any means
electronic, mechanical, photocopying, recording or otherwise without prior written consent by Dometic Corporation. Every precaution
has been taken in the preparation of this manual to ensure its accuracy. However, Dometic Corporation assumes no responsibility for
errors and omission. Neither is any liability assumed for damages resulting from the use of this product and information contained
herein.
RETAIN THESE INSTRUCTIONS FOR
FUTURE REFERENCE
DuraSea Condenser Unit
Installation, Start-Up & Service Manual
DuraSea Condenser Unit
Dometic Corporation
Rev. 20170601
PN 337982
L-3153

L-3153
Table of Contents
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
READ THIS MANUAL BEFORE PROCEEDING . . . . . . . . . 1
HOW ITWORKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Basic Principles . . . . . . . . . . . . . . . . . . . . . . . . 1
The Importance of Outside Air Temperature . . 1
SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . 1
RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS . 1
SAFETY GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . 1
UNPACKING AND INSPECTION . . . . . . . . . . . . . . . . . . 2
R-410A QUICK REFERENCE GUIDE . . . . . . . . . . . . . . 2
MODEL NUMBER NOMENCLATURE . . . . . . . . . . . . . . . . 2
INSTALLATION GUIDELINES . . . . . . . . . . . . . . . . . . . . 3
IMPORTANT SAFETY CONSIDERATIONS . . . . . . . . . . . . 3
Avoid Harmful Vapors . . . . . . . . . . . . . . . . . . . . 3
Electrical Shock Hazard . . . . . . . . . . . . . . . . . . 3
Other Hazards . . . . . . . . . . . . . . . . . . . . . . . . . 4
TOOLS REQUIRED . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CODES AND REGULATIONS . . . . . . . . . . . . . . . . . . . . . 4
CHECK UNIT ELECTRICAL CHARACTERISTICS . . . . . . . 4
PLACEMENT OF THE SYSTEM . . . . . . . . . . . . . . . . . . 4
INSTALLATION CLEARANCES . . . . . . . . . . . . . . . . . . . . 5
RIGGING AND MOUNTING THE UNIT . . . . . . . . . . . . . . . 7
Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
REFRIGERANT PIPING CONNECTIONS . . . . . . . . . . . . . 7
Copper Tubing . . . . . . . . . . . . . . . . . . . . . . . . . 7
Provide Safety Relief . . . . . . . . . . . . . . . . . . . . 7
Determine Refrigerant Line Sizes . . . . . . . . . . . 7
Liquid Lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Suction Riser . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Multiple Evaporators On Single Condenser . . . 9
Install Filter Drier . . . . . . . . . . . . . . . . . . . . . . . 10
Install Liquid Line Solenoid Valve . . . . . . . . . . 10
Selecting an Accumulator . . . . . . . . . . . . . . . . 10
Make Piping Connections . . . . . . . . . . . . . . . . 10
Insulate Suction Lines . . . . . . . . . . . . . . . . . . . 10
Routing of Liquid Line . . . . . . . . . . . . . . . . . . . 10
SERVICE VALVE OPERATION . . . . . . . . . . . . . . . . . . . 10
REPLACEMENT/RETROFIT . . . . . . . . . . . . . . . . . . . . . 10
Existing evaporator coil . . . . . . . . . . . . . . . . . . 11
Acid Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
PRESSURE TEST AND LEAK CHECKING . . . . . . . . . . . 11
EVACUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . 13
Field Power Supply . . . . . . . . . . . . . . . . . . . . . 13
Field Control Wiring . . . . . . . . . . . . . . . . . . . . 13
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
24VAC Controls . . . . . . . . . . . . . . . . . . . . . . . 14
SYSTEM START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
REFRIGERANT CHARGING GUIDELINES . . . . . . . . . . . 15
PRELIMINARY REFRIGERANT CHARGE . . . . . . . . . . . . 15
SYSTEM CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
START UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Compressor & Fan Rotation . . . . . . . . . . . . . . 16
Compressor Overload . . . . . . . . . . . . . . . . . . . 17
Final Charge Adjustment . . . . . . . . . . . . . . . . . 17
System Operation . . . . . . . . . . . . . . . . . . . . . . 18
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
QUARTERLY INSPECTION
(AND 30 DAYS AFTER INITIAL START) . . . . . . . . . . . . . 19
SEASONAL MAINTENANCE . . . . . . . . . . . . . . . . . . . . . 19
ROUTINE CLEANING OF CONDENSER COILS . . . . . . . . 19
ROUTINE CLEANING & PROTECTION OF CABINET . . . . 19
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
REFRIGERATION SYSTEM . . . . . . . . . . . . . . . . . . . . . 20
Servicing Units on Roofs/Decks With Synthetic
Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Liquid Line Filter Drier . . . . . . . . . . . . . . . . . . . 20
Field Refrigerant Access Ports . . . . . . . . . . . . 20
COMPRESSOR PROTECTION . . . . . . . . . . . . . . . . . . . 20
Compressor Over-Temperature Protection (IP) 20
Low-Pressure Switch . . . . . . . . . . . . . . . . . . . . 20
High-Pressure Switch . . . . . . . . . . . . . . . . . . . 20
Low-Ambient Option . . . . . . . . . . . . . . . . . . . . 20
LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Fan Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
GENERAL TROUBLESHOOTING . . . . . . . . . . . . . . . . 21
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 21
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . 23
PRELIMINARY INFORMATION . . . . . . . . . . . . . . . . . . . 23
PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

DuraSea Condenser Installation, Start-Up & Service Manual Read This Manual Before Proceeding
L-3153 1
INTRODUCTION
The Dometic DuraSea Split System is a direct-expansion air-cooled air conditioning system designed for use in marine and
other harsh environments. Its two primary components consist of a condensing unit and an evaporator unit. A complete system
also requires installation of control(s), ducting, and a refrigerant line-set.
READ THIS MANUAL BEFORE PROCEEDING
This manual contains essential information to ensure proper installation, operation and maintenance of your DuraSea Split
System. Improper installation or misunderstood operating procedures can result in unsatisfactory performance and/or
premature failure of these units, so please read this manual completely before proceeding.
It is very important that you read and understand the contents of this manual before using the equipment, and it should be kept
for future reference. If you have questions or require assistance with your DuraSea Condenser, call your Dometic Marine
Service Department at [phone].
HOW ITWORKS
BASIC PRINCIPLES
The basic principle behind an air conditioner is the transfer of heat from one place to another. In an air-cooled air conditioner,
heat is removed from the inside cabin air and transferred to the outside air. The efficiency of the system operation depends on
both outside air and cabin temperatures.
THE IMPORTANCE OF OUTSIDE AIR TEMPERATURE
When cooling, the air conditioner will operate most efficiently in outside air temperatures below 100°F (38°C). At higher air
temperatures the unit will operate, but at a reduced capacity. A high-pressure shutdown may occur at outside ambient air
temperatures near 130°F (54°C).
SAFETY INSTRUCTIONS
RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS
The following symbols and labels are used throughout this manual to indicate immediate or potential safety hazards. it is the
owner’s and installer’s responsibility to read and comply with all safety information and instructions accompanying these
symbols. Failure to heed safety information increases the risk of personal injury, property damage, and/or product damage.
SAFETY GUIDELINES
1. Allow only qualified, experienced technicians to install or service this system.
2. Install the system in accordance with all local codes. If no local codes exist, follow National Codes (NEC in the U.S.,
CEC in Canada).
3. Open the electrical disconnect switch(es) before electrically connecting the unit.
4. Before operating the unit, be certain it is properly grounded.
5. The units contain refrigerant gas under pressure. Avoid puncturing or breaking any tubing.
6. Before operating the system, complete the refrigerant connections.
WARNING
The word “WARNING” indicates hazards or unsafe practices which COULD result in severe personal injury or death.
CAUTION
The word “CAUTION” indicates hazards or unsafe practices which COULD result in minor or moderate personal injury,
product damage, or property damage.
WARNING
To avoid personal injury, shock, or death, ensure the electrical disconnect switch(es) is (are) in the OFF position
before installing, modifying, or servicing the unit. Lock out and tag the switch with a suitable warning label. Wiring
must conform with NEC or CEC and all local codes.

R-410A Quick Reference Guide DuraSea Condenser Installation, Start-Up & Service Manual
2L-3153
UNPACKING AND INSPECTION
Units are securely packed in shipping crates. Upon arrival, carefully check all items against the packing list to ensure all cartons
were received and correct equipment was received. Always keep the unit in the "up" orientation as indicated by the arrows on
each carton.
Check the cartons for external damage, removing the units from the packaging if necessary. If damage is found, file a request in
writing for inspection by the carrier agent immediately. The carrier is responsible for making prompt inspection of damage and
for a thorough investigation of each claim. The distributor or manufacturer will not accept claims from dealers for transportation
damage. If no damage is found, carefully remove all shipping material and properly dispose of it.
After unpacking, keep the units as upright as possible. Laying a unit on its side or top could cause equipment damage.
R-410A QUICK REFERENCE GUIDE
• This system uses R-410A refrigerant.
• R-410A is an environmentally safe hydrofluorocarbon (HFC) refrigerant.
• R-410A refrigerant operates at 50-70% higher pressures than R-22. Ensure that the servicing equipment and
replacement components used are designed to operate with R-410A.
• R-410A refrigerant cylinders are light maroon (pink) in color.
• R-410A refrigerant cylinders have a dip tube which allows liquid to flow out of the cylinder in an upright position.
NOTE: Recovery cylinder service pressure rating must be 400 psig (2758 kPa), DOT RBA400 or DOT BW400.
• R-410A systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold
hose.
• R-410A requires a different set of gauges than those used for R-22.
• Manifold sets should be 800 psig (5516 kPa) high side and 250 psig (1724 kPa) low side with 550 psig (3792 kPa) low
side retard.
• Use hoses with 800 psig (5516 kPa) service-pressure rating.
• R-410A requires matched evaporator and condenser systems.
• Leak detectors should be designed to detect HFC refrigerant.
• R-410A, as with other HFCs, is only compatible with POE or PVE oils.
• POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
• Vacuum pumps will not remove moisture from oil.
• A liquid line filter dryer listed for R-410A is required on every unit.
• Do not use liquid line filter dryers with rated working pressures less than 600 psig (4137 kPa).
• Do not install a suction line filter dryer in a liquid line.
• Wrap all filter dryers and service valves with wet cloth when brazing.
• Do NOT use an R-22 thermal expansion valve (TXV).
• Never open system to atmosphere while it is under a vacuum.
• When system must be opened for service, evacuate then break vacuum with dry nitrogen and replace filter dryers.
• Do not vent R-410A into the atmosphere.
MODEL NUMBER NOMENCLATURE
For an explanation of the model numbers see Figure 1, page 3.

DuraSea Condenser Installation, Start-Up & Service Manual Important Safety Considerations
L-3153 3
Figure 1: Model Number Nomenclature
INSTALLATION GUIDELINES
IMPORTANT SAFETY CONSIDERATIONS
AVOID HARMFUL VAPORS
Consideration should be given to installing a trap in the condensate drain line(s) so that normal discharge of condensate can fill
the trap and prevent the ingress of carbon monoxide (CO) or other potentially harmful vapors.
ELECTRICAL SHOCK HAZARD
WARNING
Never install your air conditioner in the bilge or engine room areas. Ensure that the selected location is sealed from
direct access to bilge and/or engine room vapors.
Do not terminate condensate drain line within three feet (1 meter) of any outlet of engine or generator exhaust
systems, nor in a compartment housing an engine or generator, nor in a bilge, unless the drain is connected properly
to a sealed condensate or shower sump pump.
Failure to comply may allow bilge or engine room vapors to mix with the air conditioner’s return air and contaminate
living areas which may result in injury or death.
WARNING
Electrical shock hazard. Disconnect voltage at main panel or power source before opening any cover. Failure to
comply may result in injury or death.
To minimize the hazard of electrical shock and personal injury, this component must be effectively grounded. Refer to
the installation guidelines for further information.
123456789101112131415
DCA036A4663C0AA
DuraSeaCondensingUnit Options
A=None
RefrigerantType B=Nema4xelectricBox&heatshrunkelectricconnections
A=R410A C=LowambientFanCyclingControl
B=R417A D=PhaseMonitor
E=ValveFanSide(VFS)Ͳstandardon7.5/10tonmodels
NominalTonnage F=VariableFrequencyDrive
030=2.5Tons G=CrankcaseHeater
036=3Tons H=SuctionAccumulator
048=4Tons I=Reservedforfutureuse
060=5Tons J=Reservedforfutureuse
072=6Tons K=CombinationofoptionsB,C,D,G,andH
090=7.5Tons
120=10Tons
DesignRevision
ControlType A=InitialRev
A=NoneͲusewith24VACThermostat
Q=QControl NotUsed
0=NotUsed
Voltage
2361=230V/60/1
2251=220V/50/1 CoilOptions
2363=208Ͳ230V/60/3 A=AlFin/CopperTube
4663=460V/60/3 B=EͲCoatAlFin/CopperTube
3853=380V/50/3 C=CopperFin/Tube
ͲͲͲͲͲͲͲͲ ͲͲͲͲͲͲͲͲͲͲ ͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲ

Tools Required DuraSea Condenser Installation, Start-Up & Service Manual
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OTHER HAZARDS
Installation and servicing of this system can be hazardous due to system pressure and electrical components.
• When working on this equipment, always observe precautions described in the literature, tags and labels attached to
the unit.
• Follow all safety codes.
• Wear safety glasses and work gloves and place a fire extinguisher close to the work area.
TOOLS REQUIRED
Before starting, make sure you have all of the following tools:
• Standard tool box
• Service wrench
• Flaring tool
• Refrigerant gauge manifold (rated for R-410A only)
• Refrigerant tank (rated for R-410A only)
• Nitrogen tank
• Vacuum pump
•Scale
• Micron gauge
• Electronic leak detector (rated for R-410A)
• Drill/hole saw
• Jig saw
• Insulated tape
•Ducttape
• Electrical tape
• Teflon tape
• Hardware to secure unit, pump, grilles, and control panel
CODES AND REGULATIONS
This product is designed and manufactured to comply with national codes. Installation in accordance with such codes,
prevailing local codes/regulations, and National Electrical Code (NEC, U.S.A.) is the responsibility of the installer. The
manufacturer assumes no responsibility for equipment installed in violation of any codes or regulations.
CHECK UNIT ELECTRICAL CHARACTERISTICS
Confirm before installation of unit that voltage, amperage and circuit protection requirements listed on unit data plate agree with
power supply provided.
PLACEMENT OF THE SYSTEM
Selecting a good location for your air conditioner is the most important part of your preparations. Be sure to consider the size of
the area you are cooling, the air distribution needs, and the size of the unit you have chosen.
Keeping in mind that cool air falls, it is highly recommended that you locate the supply air grille as high as possible in the cabin.
CAUTION
United States federal law prohibits the intentional release of refrigerant gases into the environment, including the R-
410A refrigerant used in this air conditioning system. Special care must be taken when installing, charging and
servicing Dometic equipment to prevent any loss of refrigerant.
Dometic does not recommend the practice of using refrigerant to purge air and moisture from the system at
installation. This formerly used practice of purging is in violation of United States federal law.
NOTICE
Contains R-410A fluorinated greenhouse gas in sealed equipment. Refer to the condensing unit's product data plate
label for quantity of refrigerant shown in weight, global warming potential (GWP), and equivalent tonnes of CO2
(tCO2e). Any refrigerant added should be noted on unit label.

DuraSea Condenser Installation, Start-Up & Service Manual Installation Clearances
L-3153 5
Plan all connections which must be made prior to starting installation, including ducting, grilles, copper line set, condensate
drain, electrical power connections, and location of control panel. See Figure 2 for general layout example.
Select a location for the condensing unit and its support system (pad, rails or other) that provides for the minimum clearances
required for safety. This includes the clearance to combustible surfaces, airflow clearance, wiring, refrigerant piping, and service
access below, around and above unit as specified in unit drawings. Check for possible overhead obstructions which may
interfere with unit lifting or rigging. Locate the unit so that the outdoor coil (condenser) airflow is unrestricted on all sides and
above.
Figure 2: General System Layout Diagram
INSTALLATION CLEARANCES
Special considerations must be given to location of the condensing unit(s) in regard to structures, obstructions, other units, and
any other factors that may interfere with air circulation. Where possible, the top of the unit should be unobstructed, however if
vertical conditions require placement beneath an obstruction there should be a minimum of 30 inches (762 mm) between the
top of the unit and the obstruction(s). The specified dimensions meet requirements for air circulation only. Consult all
appropriate regulatory codes prior to determining final clearances.
Another important consideration in selecting location for the unit(s) is the angle to obstructions. Either coil side can be placed
toward the structure with appropriate clearance. It is not recommended for fan side to be placed towards structure. Service
access side of unit should be placed to provide adequate service clearance. Corner installations are strongly discouraged.
Refer to Figure 3 on page 6 and Figure 4, page 6 for mandatory minimum installation clearance requirements.
DO NOT locate the unit:
• Where fresh air supply to the outdoor coil may be restricted or when recirculation from the condenser fan discharge is
possible.
• In a well or next to high walls.
• Where the noise would prove to be a nuisance to the owner (i.e., salons, decks, sleeping cabins, etc.).

Installation Clearances DuraSea Condenser Installation, Start-Up & Service Manual
6L-3153
AVOID:
• Locations that permit water from higher level runoff and overhangs to fall onto the unit.
• Direct tubing contact with water pipes, ductwork, floor joists, floors, and walls.
• Suspending refrigerant tubing from structure with rigid wire or straps that would come in contact with tubing.
DO locate the unit:
• To minimize the length of refrigerant piping required.
• To provide adequate service clearances.
• On a level surface or other sturdy platform.
• Isolated from the structure to avoid transmission of vibrations.
DO:
• Leave slack between structure and unit to absorb vibration.
• When passing refrigerant tubes through the bulkhead, seal the opening with RTV or a pliable silicon-based caulk.
• Ensure that the suction and liquid line tube diameters are appropriate for unit capacity.
• Avoid unnecessary turns and bends by running refrigerant tubing as directly as possible.
• In general, short runs of refrigerant piping are better than long runs. If practical, locate the unit accordingly.
Figure 3: Installation Clearance - DCA 24-72
Figure 4: Installation Clearance - DCA 90-120
METRIC
CONVERSION CHART
inches (") cm
615
12 30
18 45
24 60

DuraSea Condenser Installation, Start-Up & Service Manual Rigging and Mounting the Unit
L-3153 7
RIGGING AND MOUNTING THE UNIT
RIGGING
These units are designed for overhead rigging. Spreader bars or a field-provided H-style frame just above the top edge of unit
are required. All panels and top must be in place when rigging. As further protection for coil faces, plywood sheets may be
placed against the sides of the unit, behind cables. Run cables to a central suspension point so that the angle from the
horizontal is not less than 45 degrees. Raise and set the unit down carefully.
If it is necessary to move the unit into position, mount the unit on longitudinal rails, using a minimum of 3 rollers. Apply force to
the rails, not the unit. If the unit is to be skidded into position, place it on a large pad and drag it by the pad. Do not apply any
force to the unit. Raise from above to lift the unit from the rails or pad when unit is in its final position.
MOUNTING
After the unit is in position, remove all protective coverings. The condensing unit should be secured using mounting hardware
provided to level surface that is designed for the weight of the unit and torsion loads from the vessel's movement. Unit should be
mounted above the deck so it is unaffected by vessel washdown activity.
If mounted in area has debris and clippings, the mounting surface should extend a minimum of 6 inches (150 mm) beyond unit
cabinet. Install a gravel or other apron in front of condenser coil air inlet to prevent grass and foliage from obstructing airflow. If
vibration isolators are required for a particular installation, use the data in Table 2 on page 16 to make the proper selection.
REFRIGERANT PIPING CONNECTIONS
COPPER TUBING
Refrigeration-grade tubing is required to connect the refrigerant circuit from the evaporator to the condensing unit. You must use
tubing with the proper diameter and wall thickness specified for R-410A pressures.
Refrigerant tubing is normally soft drawn and nitrogen purged. All refrigerant lines should be capped to protect against moisture
and dust infiltration. Tubing should always be cut square keeping ends round and free from burrs. Clean the tubing to prevent
contamination.
Extreme care must be taken not to crush or kink any portion of either line set. Use proper tools for line bending, avoiding sharp
bends or kinks. Any kinked or crushed section must be replaced. There should be no vertical loops (oil traps) in the copper lines.
When using multiple evaporators, ensure that the fittings are sized correctly to allow correctly sized tubing to be connected to air
handler fittings and provide proper refrigerant flow to and from each air handler.
PROVIDE SAFETY RELIEF
If local codes dictate an additional safety relief device, purchase locally and install locally. Installation will require the recovery of
the factory shipping charge before the factory tubing can be cut and the supplemental relief device is installed.
DETERMINE REFRIGERANT LINE SIZES
Determine the linear length of interconnecting piping required between the outdoor unit and indoor unit (evaporator). Consider
and identify the arrangement of the tubing path (quantity and type of elbows in both lines), liquid line solenoid size, filter drier
and any other refrigeration specialties located in the liquid line. Refer to the indoor unit installation instructions for additional
details on refrigeration specialties devices.
Select the recommended line sizes for DuraSea unit from Table 1 on page 8. These sizes are suitable for line lengths of 50 feet
(15.24 m) or less. If a run of more than 50 feet (15.24 m) is required, contact Dometic applications team for assistance.
CAUTION
Unit Damage Hazard - Failure to follow this caution may result in equipment damage.
All panels and top must be in place when rigging or moving.

Refrigerant Piping Connections DuraSea Condenser Installation, Start-Up & Service Manual
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Table 1: DuraSea Unit Refrigerant Line Specifications
DURASeaCondensingUnitR410ASPECIFICATIONS
Model DCA36D DCA36E DCA48D DCA48E DCA60D DCA60E DCA72D DCA72E DCA90D DCA90E DCA120D DCA120E NominalCooling(BTU/Hr) 36,000 36,000 48,000 48,000 60,000 60,000 72,000 72,000 90,000 90,000 120,000 120,000
Compressor RLA 10.9 5 12.7 6.6 14.8 7.4 17.9 8.9 25.5 13.4 31.3 15.3 LRA 95 45 120 60 123 70 160 87 235 110 267 142 CondenserFan CFM 6000 6000 6000 6000 6000 6000 6000 6000 6000 6000 10000 10000 MotorFLA 3.6 2.0 3.6 2.0 3.6 2.0 3.6 2.0 3.6 2.0 8.5 4.9 RefrigerationSystem LiquidBaseValve(ID) 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 7/8 7/8 7/8 7/8 SuctionBaseValve(ID) 7/8 7/8 7/8 7/8 7/8 7/8 7/8 7/8 1Ͳ1/8 1Ͳ1/8 1Ͳ1/8 1Ͳ1/8
SuggestedLiqLine(OD)13/8 3/8 3/8 3/8 3/8 3/8 1/2 1/2 1/2 1/2 5/8 5/8
SuggestedSuctLine(OD)13/4 3/4 3/4 3/4 7/8 7/8 7/8 7/8 1Ͳ1/8 1Ͳ1/8 1Ͳ3/8 1Ͳ3/8
MaximumLift(Ft) 25 25 25 25 35 35 35 35 45 45 45 45 FactoryRefrigerantCharge 80 80 80 80 120 120 120 120 160 160 150 150
ElectricalData PowerVolts/Hz/Phase
208Ͳ230/60/3'
460/60/3Y
208Ͳ230/60/3'
460/60/3Y
208Ͳ230/60/3'
460/60/3Y
208Ͳ230/60/3'
460/60/3Y
208Ͳ230/60/3'
460/60/3Y
208Ͳ230/60/3'
460/60/3Y
Min.CircuitAmpacity225 12 30 15 30 20 40 20 50 25 55 30
Max.BreakerProtection335 15 40 20 40 25 55 30 70 30 75 40 Min/MaxVolts 197/253 414/506 197/253 414/506 197/253 414/506 197/253 414/506 197/253 414/506 197/253 414/506
SoundLevel(dbA)484 84 84 84 84 84 84 84 84 84 87 87
UnitWeight(lbs)5290 290 310 310 365 365 375 375 475 475 525 525
1Recommendedlinesizesbasedonlinelengthlessthan50'.ConsultDometicforlongerlinelenghts. 2WiresizeshouldbedeterminedinaccordancewithNationalElectricalCodes,Extensivewirerunsrequirelargerwiresizes 3MustusetimeͲdelayfusesorHACRtypecircuitbreakersofthesizeasnoted 4Soundlevelmeasuredfrom3ftawayfromCondensingunit 5WeightforAluminumfincondensercoilwithcoating.
AlldatasubjecttochangeatDometic'sdiscretionintheinterestofproductimprovement
METRIC
CONVERSION CHARTS
Condenser Fan Flow
Refrigeration System
Unit Weight
CFM CMM
6000 170
10000 283
Fractional
inches mm
1/2 13
7/8 23
1-1/8 29
Feet Meters
25 7.6
35 10.7
45 13.7
Pounds
(lbs) Kilograms
290 131.5
310 140.6
365 165.6
375 170.1
475 215.5
525 238.1

DuraSea Condenser Installation, Start-Up & Service Manual Refrigerant Piping Connections
L-3153 9
LIQUID LIFT
A liquid lift condition exists when the outdoor unit is located below the indoor (evaporator) unit and liquid flows vertically up in a
portion of the liquid line. The vertical column of liquid reduces the available state point subcooling at the evaporator coil's
thermal expansion valve. This effect reduces the length of liquid lift (height of elevation) that a liquid line size can accommodate.
Longer linear tube lengths will also reduce the amount of liquid lift possible.
Mounting the evaporator coil above the condensing unit will require an inverted loop in the suction line adjacent or near the
connection to the evaporator. The top of the loop must be slightly higher than the top of the coil. See Table 1 for maximum liquid
lift capabilities. If cannot provide the required lift distance on this installation, relocate the outdoor unit to reduce the equivalent
line length or the lift requirement.
SUCTION RISER
A suction riser condition exists when the outdoor unit is located above the indoor (evaporator) unit and suction vapor must flow
vertically up to return to the compressor. Oil return is a concern when the suction tube size is too large to produce the minimum
refrigerant velocity to ensure oil return at minimum load conditions.
Mounting the condensing unit above the evaporator coil will require oil traps at equal intervals along the suction line. Install one
oil trap for a height difference of 15 to 25 feet (4.5 to 7.6 m) between indoor and outdoor units. Install two oil traps for a
difference of 26 to 50 feet (7.9 to 15.2 m), three for 51 to 100 feet (15.5 to 30.4 m), and four for 101 to 150 feet (30.7 to 45.7 m).
Consider suction speed riser (reduced tube size for vertical segment only) or double suction riser arrangement if the proposed
suction tube size does not provide necessary minimum flowrates for this riser.
Figure 5: Liquid and Suction Riser Diagram
MULTIPLE EVAPORATORS ONSINGLE CONDENSER
The DuraSea units are designated to be controlled by a single thermostat. When two evaporator coil units are connected to a
single condenser unit the evaporators plumbed in parallel. Piping to each evaporator must be of same size and piping
configuration must be similar in design and of same equivalent length.
EVAPORATOR
EVAPORATOR
DURASEA
CONDENSING
UNIT
DURASEA
CONDENSING
UNIT
LIQUID RISER
SUCTION RISER
PITCH DOWN
TO OUTDOOR
UNIT
PITCH
LOOP TO PREVENT
DRAINAGE DURING
OFF CYCLE
OIL TRAP
(SEE DETAIL OF OIL TRAP)
OIL TRAP
(SEE DETAIL OF OIL TRAP)
LOOP
LIQUID LINE
SUCTION
LINE
SUCTION
LINE
LIQUID LINE
45 DEG ELL
SHORT RADIUS
STREET ELL
45 DEG STREET ELL
LONG RADIUS
STREET ELL
OIL TRAP CONSTRUCTION DETAIL

Service Valve Operation DuraSea Condenser Installation, Start-Up & Service Manual
10 L-3153
INSTALL FILTER DRIER
Every unit MUST have a filter drier in the liquid line.
Locate the filter drier(s) at the indoor unit, close to the evaporator coil's thermal expansion valve (TXV) inlets.
A R-410A rated filter drier is shipped in cartons near the base valves. Remove drier from packaging and install in the liquid
line(s) at the evaporator coil. Do not remove connection fitting plugs until ready to connect and braze the filter drier into the
liquid line position. Ensure the filter drier paint finish is intact after brazing. If the paint of the steel filter drier has been burned or
chipped, repaint or treat with rust preventative.
INSTALL LIQUID LINE SOLENOID VALVE
It is recommended that a solenoid valve be placed in the main liquid line between the condensing unit and the evaporator coil.
Locate the solenoid valve at the outlet end of the liquid line, near the evaporator coil connections, with flow direction arrow
pointed at the evaporator coil. A liquid line solenoid valve is required when the liquid line length exceeds 75 ft [23 m]. This valve
prevents refrigerant migration (which causes oil dilution) to the compressor during the off cycle, at low outdoor ambient
temperatures.
SELECTING AN ACCUMULATOR
Because all DuraSea models use scroll compressors, an accumulator is not required. Long refrigerant line applications may
require use of accumulator to protect compressor from excess charge. If an accumulator is to be added, check the accumulator
manufacturer's literature carefully for indication of its suitability for use with R-410A; look for minimum working pressure of 200
psig (1380 kPa). Select the accumulator first on the basis of its minimum capacity in tons to ensure oil return from the
accumulator, then on tube size or holding capacity.
MAKE PIPING CONNECTIONS
Piping connections at the DuraSea unit are base valves with stub tube extensions. Do not open the unit service valves until all
interconnecting tube brazing has been completed. The stub tube connections include 1/4-in SAE service fittings with Schrader
valve cores. Before making any brazed connections to the unit service valves, remove both Schrader valve caps and cores and
save for re-installation. Connect a source for nitrogen to one of these service fittings during tube brazing to prevent the
formation of copper oxides inside the tubes at brazed joints.
When brazing the field tubing to base valves, TXV valve, or filter drier, wrap the valves in wet rags to prevent overheating. Use
a brazing alloy of 5% minimum silver content. Do not use flux. Purge the refrigerant line with nitrogen during brazing to prevent
the formation of copper-oxide inside the refrigerant lines. After brazing quench the joints with water or a wet cloth to prevent
overheating of valves.
INSULATE SUCTION LINES
Insulation is necessary to prevent condensation from forming and dropping from the suction line. Apply Armaflex (or satisfactory
equivalent) closed-cell tubular insulation with ½" minimum wall thickness to all suction lines between evaporator coil connection
and unit's suction service valve. In severe hot and humid areas thicker wall insulation may be needed. Insulation must be
installed in a manner which protects tubing from damage and contamination.
ROUTING OF LIQUID LINE
The liquid line must be outside the suction line insulation. If part of the liquid line must run through an area that will be hotter
than 120°F (49°C), then that portion of the liquid line must be insulated. Be careful not to kink or dent the refrigerant lines.
Kinked or dented lines will cause poor performance or compressor damage.
SERVICE VALVE OPERATION
The DuraSea condensing unit is equipped with service valves to ensure safe handling of the high-pressure R-410A refrigerant.
The unit is shipped with the valve frontseated (downward position) to contain the factory charge in the unit. Gauge hoses can be
connected and disconnected without the presence of system pressure. The gauge port is isolated from the system if the stem is
backseated. The gauge ports have a standard core valve, which can be removed and replaced while the stem is backseated.
REPLACEMENT/RETROFIT
Replacement/retrofit installations require change-out of outdoor unit, metering device, and filter driers. Change-out of indoor coil
(evaporator) and interconnecting tubing is highly recommended.
CAUTION
Do not leave system open to atmosphere any longer than necessary for installation. The compressor PVE or POE oil
is extremely susceptible to moisture absorption and could cause compressor failure.
Ensure ends of tubing are sealed before and during installation.

DuraSea Condenser Installation, Start-Up & Service Manual Pressure Test and Leak Checking
L-3153 11
EXISTING EVAPORATOR COIL
If the existing evaporator coil is to be re-used, check with the coil manufacturer to verify the coil construction is suitable for
operation with the higher pressures of R-410A. Also determine if the existing TXV valve is compatible with R-410A, replace if
necessary. The minimum factory test pressure rating of evaporator must be 250 psig (1725 kPa). Existing coil will need to be
purged with Nitrogen to remove as much mineral oil as possible to eliminate cross contamination of oils.
ACID TEST
If the existing system is being replaced because of a compressor electrical failure, assume acid is in system. If system is being
replaced for any other reason, use an approved acid test kit to determine acid level. If even low levels of acid are detected,
install a 100 percent activated alumina suction-line filter drier in addition to the replacement liquid-line filter drier. Remove the
suction line filter drier after evaluation period of operation, with a maximum of 72 hours of operation. Recommendation: Install a
ball valve in the line at the filter location when installing a suction filter in the suction line.
Existing refrigeration piping - Reuse of existing refrigerant piping involves three issues: quality (strength) of existing tubing,
cleanliness and tube size. Inspect all tube segments and joints for signs of damage, corrosion or poor brazing. Flush the
interconnecting piping system with dry nitrogen to eliminate as much trace of mineral oil as possible.
INSTALLATION
1. Remove the existing evaporator coil or fan coil and install the replacement coil when appropriate.
2. Drain oil from low points and traps in suction line tubing (and hot gas bypass tubing if appropriate) and Evaporator if
they were not replaced. Removing oil from evaporator coil may require purging of the tubing with dry nitrogen.
3. Unless indoor unit is equipped with a R-410A approved metering device, change the metering device to a thermal
expansion valve (TXV) designed for R-410A.
4. Remove the existing outdoor unit. Install the new outdoor unit according to these installation instructions.
5. Install a new field-supplied liquid-line filter drier at the indoor coil just upstream of the TXV or fix orifice metering device.
6. If a suction line filter drier is also to be installed, install suction line drier downstream of suction line service valve at
condensing unit.
7. Evacuate and charge the system according to the instructions in this installation manual.
8. Operate the system for 10 hr. Monitor the pressure drop across the suction line filter drier. If pressure drop exceeds 3
psig (21 kPa), replace suction-line and liquid-line filter driers. Be sure to purge system with dry nitrogen and evacuate
when replacing filter driers. Continue to monitor the pressure drop across suction-line filter drier. Repeat filter changes
as necessary. Never leave suction-line filter drier in system longer than 72 hr (actual time).
PRESSURE TEST AND LEAK CHECKING
Once the refrigerant line-set connections are made a pressure test and a leak check of the system must be performed.
NOTE: The base valves on the unit are shipped in the frontseated position to retain the refrigerant in the condensing unit. These
valves must not be opened until the system is ready for operation.
Pressure Test
NOTE: It is sometimes assumed that any apparent leakage must originate in the equipment, but in reality leaks can also occur
in the gauge manifold and hoses. Before use, inspect the fittings on the manifold for tightness and replace any damaged hoses
or worn gaskets.
1. Before testing ensure both hand valves on the gauge manifold are closed relative to the center port (i.e., turned IN all
the way).
2. Connect the high- and low-side hoses of your R-410A gauge manifold to the condenser base valves. IMPORTANT: Do
not open the unit service valves.
3. Connect a dry nitrogen cylinder to the center port on the gauge manifold and set the regulator to a maximum pressure
of 500 psig (3447 kPa). IMPORTANT: Compressed air or CO2should not be used as they can add moisture and ether
contaminates to the system! Refrigerant should never be used unless needed for electronic leak detection.
CAUTION
Unit Damage Hazard - Failure to follow this caution may result in equipment damage or improper operation.
Never install a suction-line filter drier in the liquid line of an R-410A system.

Pressure Test and Leak Checking DuraSea Condenser Installation, Start-Up & Service Manual
12 L-3153
4. Open the hand valve a minimal amount on the line coming from the nitrogen cylinder.
5. Once the regulator on the nitrogen tank is set, open the high-pressure valve on the gauge manifold. Pressurize the
refrigerant lines and the evaporator(s) to 500 psig (3447 kPa). To reach 500 psig (3447 kPa), you may need to further
open the hand valve on the nitrogen cylinder.
6. The needle(s) will rise as pressure enters the line set and evaporator(s). Once the point of the predetermined pressure
has been reached, close the gauge valve(s). Monitor the gauge reading(s) after the pressure has stabilized (should be
less than a minute). The pressure should be left in the system for a minimum of 15 minutes.
•If the gauge pressure drops, there is a leak in the system. Refer to “Leak Check” on page 12 to determine the
location of the leak(s).
•If the gauge pressure remains constant, close the valve on the nitrogen cylinder and disconnect it from the
gauge manifold. Proceed to “Evacuation” on page 13.
.
Leak Check
IMPORTANT: Do not use a vacuum as a leak detection technique as moisture could be drawn into the system.
•A rapid drop in gauge pressure indicates a large leak or several small ones.
•A slow drop in gauge pressure indicates small leak(s).
Open both gauge valves and pressurize the system again to maintain a positive pressure on the lines and evaporator while
checking for leaks. Use the following techniques to locate leaks.
• Large leaks can often be detected by listening for a hissing sound or felt by placing your hand around the leaking
fitting. NOTE: If pipe insulation encases a leaking fitting, the escaping nitrogen can be forced down the insulation to a
remote location, giving a false indication of the leak location.
• Apply a soap solution on all connections and joints. Bubbles indicate leaks, so mark these locations. Clean off the soap
solution when leak checking is complete.
• If the leaks cannot be located with the previous methods, an electronic leak detector should be used. For this
procedure, add a trace of R-410A refrigerant to the nitrogen in the system (if permitted by current EPA regulations).
NOTE: Ensure the electronic leak detector you use is capable of sensing HFC-type refrigerants.
Repeat the procedures above until all leaks are found and repaired. After repair, repeat the steps in “Pressure Test” on page 11.
When pressure-testing is completed, remove the nitrogen source at the outdoor unit service valves and re-install the two
Schrader valve cores. Torque the cores to 3 in-lbs (23-34 N-cm).
WARNING
To avoid possible explosion, the line from the nitrogen cylinder must include a pressure regulator and a pressure
relief valve.
CAUTION
Never exceed 800 psi (5516 kPa) due to the possibility of rupturing hoses or line-set connections.
WARNING
When using high-pressure nitrogen in the system, wear safety glasses and gloves.
Secure the hose end to prevent injury to personnel or damage to property. Do not point the hose toward personnel or
property.
To prevent inhalation, the nitrogen should NOT be expelled into a confined space where personnel are working; the
work area should be well ventilated.
If the nitrogen is mixed with refrigerant , contact with an open flame or hot surface could create PHOSGENE GAS,
which can cause respiratory problems or death.
CAUTION
Care must be taken to ensure soap solution does not ingress into a leaking fitting(s) and contaminate the system.

DuraSea Condenser Installation, Start-Up & Service Manual Evacuation
L-3153 13
EVACUATION
If you have confirmed that the system maintains pressure, the line set and evaporator(s) are now ready for evacuation of the
nitrogen (or nitrogen/refrigerant mixture if an electronic leak detector was needed) from the system.
Release nitrogen from system.
Evacuation/Dehydration
Evacuate and dehydrate the connected refrigeration system, excluding the condensing unit, to 200 microns using a two-stage
vacuum pump attached to the service ports on the DuraSea service valves. Close the valve to the vacuum pump. Wait five
minutes, then check the pressure on the thermocouple vacuum gauge.
• If the pressure is not more than 1000 microns, the system is leak-free and properly evacuated. Proceed to “Preliminary
Refrigerant Charge” on page 15.
• If the pressure rises, but holds at about 2000 microns, moisture and noncondensibles are still present. Open the valve
to the vacuum pump, and continue evacuation until moisture is removed.
• If the pressure rises above 5000 microns, a leak is present. Go back to “Pressure Test and Leak Checking” on
page 11. Close the valve to the thermocouple vacuum gauge. Close the valve to the vacuum pump. Shut off the pump.
ELECTRICAL CONNECTIONS
NOTE: Check all factory and field electrical connections for tightness. Field-supplied wiring shall conform with the limitations of
63°F (35°C) rise.
FIELD POWER SUPPLY
When installing units, provide a disconnect switch per NEC or CEC of adequate size.
Disconnect sizing data is provided on the unit informative plate. Locate on unit cabinet or within sight of the unit per national or
local codes. Do not cover unit data plate if mounting the disconnect on the unit cabinet.
All field wiring must comply with NEC and all local codes. Size wire based on MCA (Minimum Circuit Amps) on the unit data
plate. Connect wiring as per diagram located on unit.
Provide a ground-fault and short-circuit over-current protection device (fuse or breaker) per NEC Article 440 (or local codes).
Refer to unit informative data plate for MCB (Maximum Circuit Breaker) device size. Use HACR type circuit breakers or time
delay fuses to assure sufficient time delay to permit the compressor to start.
Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. On 3-phase units,
voltages between phases must be balanced within 2% and the current within 10%. Operation on improper line voltage or
excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would
invalidate any applicable Dometic warranty.
FIELD CONTROL WIRING
DuraSea condenser uses a 24 VAC control voltage provided by air-handler. See Figure 6, page 14 for typical field control
connections and the unit's label diagram for field-supplied wiring details. Route control wires to the DuraSea unit through the
opening in unit's end panel to the connections 24VAC terminal block in the unit's control box.
Remainder of the system controls connection will vary according to the specific construction details of the indoor section (air
handler or packaged fan coil). Plan for field connections carefully and install control wiring correctly per the project plan.
WARNING
Failure to follow this warning could result in personal injury or death.
Disconnect ALL power before servicing. Do not use gas piping as an electrical ground. Unit cabinet must have an
uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should
occur. Wiring must conform with NEC or CEC and all local electrical codes. Undersized wires could cause poor
equipment performance, equipment damage or fire.
WARNING
To avoid risk of fire or equipment damage, use copper conductors.

Electrical Connections DuraSea Condenser Installation, Start-Up & Service Manual
14 L-3153
Figure 6: 24VAC Wiring Diagram
THERMOSTAT
Install an approved accessory thermostat according to installation instructions included with the accessory. Locate the
thermostat accessory on a solid wall in the conditioned space to sense average temperature in accordance with the thermostat
installation instructions. DuraSea unit is a single-stage cooling unit. Use a single stage cooling thermostat. Select a thermostat
cable or equivalent single leads of different colors. Check the thermostat installation instructions for additional features which
might require additional conductors in the cable. For wire runs up to 50 ft. (15 m), use no. 18 AWG (American Wire Gage)
insulated wire (35 C minimum). For 50 to 75 ft. (15 to 23 m), use no. 16 AWG insulated wire (35 C minimum). For over 75 ft. (23
m), use no. 14 AWG insulated wire (35 C minimum). All wire sizes larger than no. 18 AWG cannot be directly connected to the
thermostat and will require a junction box and splice at the thermostat.
24VAC CONTROLS
Most commercial evaporator units include a transformer to provide 24VAC to provide power for thermostat. Dometic Marine
evaporators do not include a 24VAC output. In this instance the optional DuraSea 24VAC control box can be used to provide
24VAC power source to operate the DuraSea condenser fan, compressor, and indoor fan motor contactor (or control relay).
Additional devices may also include a liquid line solenoid valve, supplemental electric heater contactors or control relays and
other devices selected by system designer. Ensure the transformer is sized to handle additional power requirement of
supplemental devices.

DuraSea Condenser Installation, Start-Up & Service Manual Refrigerant Charging Guidelines
L-3153 15
SYSTEM START-UP
Use the “START-UP CHECKLIST” on page 23 to make notes as you go through the start-up procedures.
REFRIGERANT CHARGING GUIDELINES
This unit is designed for use with R-410A refrigerant. Do not use any other refrigerant in this system. R-410A refrigerant is
provided in pink (rose) colored cylinders. These cylinders are available with and without dip tubes; cylinders with dip tubes will
have a label indicating this feature. For a cylinder with a dip tube, place the cylinder in the upright position (access valve at the
top) when removing liquid refrigerant for charging. For a cylinder without a dip tube, invert the cylinder (access valve on the
bottom) when removing liquid refrigerant.
Because R-410A refrigerant is a blend, it is strongly recommended that refrigerant always be removed from the cylinder as a
liquid. Admit liquid refrigerant into the system in the discharge line. If adding refrigerant into the suction line, use a commercial
metering/expansion device at the gauge manifold; remove liquid from the cylinder, pass it through the metering device at the
gauge set and then pass it into the suction line as a vapor. Do not remove R-410A refrigerant from the cylinder as a vapor.
PRELIMINARY REFRIGERANT CHARGE
DuraSea condensing units are pre-charged with refrigerant as per unit data plate. Pre-charge amount is sufficient for
condensing unit plus 15 foot of lineset. Additional charge must be added for the evaporator and linesets longer than 15 feet (4.5
m). The amount of refrigerant to be added can be estimated from Table 2. See example below.
1. Purge gauge lines. Connect service gauge to base valve service ports.
2. Add R-410A liquid refrigerant into the lineset through the liquid service valve.
3. After charge is added open the liquid line and suction line service valves to the top seated position.
WARNING
Failure to follow this warning could result in personal injury, death, and/or equipment damage.
R-410A refrigerant systems operate at highter pressure than standard R-22 systems. Do not use R-22 service
equipment or components on R-410A refrigerant equipment.
WARNING
Refrigerants are heavier than air. They can “push out” the oxygen in your lungs or in any enclosed space. To avoid
possible death or difficulty breathing:
• Never sniff a refrigerant.
• Never purge refrigerant into an enclosed room or space. All refrigerants must, BY LAW, be reclaimed.
• If an indoor leak is suspected, thoroughly ventilate the area before beginning work.
• Liquid refrigerant can be very cold. To avoid possible frostbite or blindness, avoid contact and wear gloves and
goggles. If liquid refrigerant does contact your skin or eyes, get medical help immediately.
• Never burn refrigerant, as poisonous gas will be produced.
• Always follow EPA guidelines.

System Check DuraSea Condenser Installation, Start-Up & Service Manual
16 L-3153
Table 2: R-410A Refrigerant Start-Up Charge
Example:
DCA60 with 40 feet (12.1 m) of refrigerant line:
From Table 2 add 26 ounces (737 g) of R-410A refrigerant.
SYSTEM CHECK
1. The electrical power source must agree with the unit's nameplate rating.
2. Check all air handler(s) and other equipment auxiliary components. Consult the manufacturer's instructions regarding
any other equipment connected to the condensing unit. If the unit has field-installed accessories, be sure all are
properly installed and correctly wired.
3. Check tightness of all electrical connections.
4. Be sure liquid line and low side of the system are properly leak checked and dehydrated.
5. Be sure the unit is properly evacuated, leak checked, and charged.
6. Ensure the liquid line and suction line service valves are set to the top seated position.
7. All barriers and covers must be in place.
NOTE: The units are factory charged with the required amount of oil. If oil recharging is required, call Dometic for proper
amount.
START UNIT
Set the space thermostat to a set point above ambient temperature so that there is no demand for cooling. Close the power
disconnect switch. Reset the space thermostat below ambient temperature so that a call for cooling is ensured.
COMPRESSOR & FAN ROTATION
On 3-phase units with scroll compressors, it is important to be certain that the compressor is rotating in the proper direction.
When a three-phase scroll compressor is operating in reverse it is noisier and its current draw is substantially reduced
compared to rated values. A phase monitor is recommended to indicate reverse power phasing.
The condenser fan should be blowing air toward fan grille.
To correct phase order:
1. Turn off power to the unit, tag disconnect.
2. Reverse any two of the unit power leads.
3. Reapply power, verify correct compressor pressures and condenser air flow.
pg
Usethistabletodeterminestartupchargeofsystem
.
DuraSea R410A systems use Thermal Expansion Valves to optimize system operation and thus cannot be charged using superheat method
A properly operating TXV will maintain Superheat in range of 10 to 25 degrees.
System must be charged by Subcooling method.
Charge in cool mode steady state to acheive 4 to 8 degrees F of subcooling at condenser base valve.
System overcharged with refrigerant can lead to catastrophic failure. Symptoms are high head pressure, high running current, and
high subcooing.
Compressor
Tube Diameter Lineset Maximum Factor
y
Charge in ounces to be added by installer for Lineset in feet of length noted
Unit Liquid Suction Charge/ft Charge(oz) Charge (oz) 15 20 25 30 35 40 45 50
24k 3/8 5/8 0.56 128 80
- 3 6 8 11 14 17 20
30k 3/8 3/4 0.59 128 80
- 3 6 9 12 15 18 21
36k 3/8 3/4 0.59 128 80
- 3 6 9 12 15 18 21
48k 3/8 3/4 0.59 192 80
- 3 6 9 12 15 18 21
60k 1/2 7/8 1.05 192 120
- 5 111621263237
72k 1/2 7/8 1.05 192 120
- 5 111621263237
90k 1/2 11/8 1.14 256 160
- 6 111723293440
120k 5/8 13/8 1.82 272 160
- 9 182736465564
NOTE:Suctionaccumulatorandcrankcaseheatermustbeusedifsystemchargeexceeds"CompressorMaximumCharge".
ConsultDometicApplicationsteam.

DuraSea Condenser Installation, Start-Up & Service Manual Start Unit
L-3153 17
To verify the compressor is rotating in the proper direction:
1. Connect service gauges to the suction and liquid pressure fittings.
2. Energize the compressor.
3. The suction pressure should drop and the liquid pressure should rise, as is normal on any start-up.
COMPRESSOR OVERLOAD
This overload interrupts power to the compressor when either the current or internal motor winding temperature becomes
excessive, and automatically resets when the internal temperature drops to a safe level. This overload may require 60 minutes
(or longer) to reset. If the internal overload is suspected of being open, disconnect the electrical power to the unit and check the
circuit through the overload with an ohmmeter or continuity tester.
FINAL CHARGE ADJUSTMENT
DuraSea R-410A systems use TXVs (Thermal Expansion Valves) to optimize system operation and thus cannot be charged
using the superheat method. System must be charged by Subcooling method.
1. Operate the unit for a minimum of 15 minutes. Ensure that pressure and temperature readings have stabilized.
2. Indoor airflow must be within the unit's normal operating range.
3. Indoor ambient temperature must be in 70°F to 80°F (21°C to 27°C) range.
4. Mount the temperature sensing device on the liquid (small) line close to the liquid line service valve, and insulate it so
that outdoor ambient temperature does not affect the reading.
5. Use a thermometer to measure the outdoor ambient temperature. The outdoor temperature will determine the next
step.
Outdoor Temp 65°F (18°C) or Higher
1. Check subcooling and superheat. Subcooling = Saturated Liquid Temp - Liquid Line Temp. Subcooling should be 6 ±
2°F (3.3 ± 1°C). Superheat = Suction Line Temp - Saturated Suction Temp. Superheat should be 12 ± 4°F (6.6 ± 2°C).
a. If subcooling and superheat are low, adjust TXV to 10°F to 12°F (5.5°C to 6.6°C) of superheat, then check
subcooling.
b. If subcooling is low and superheat is high, add charge to raise subcooling to 6 ± 2°F (3.3 ± 1°C) then check
superheat.
c. If subcooling and superheat are high, adjust TXV valve to 10°F to 12°F (5.5°C to 6.6°C) of superheat, then
check subcooling.
d. If subcooling is high and superheat is low, adjust TVX valve to 10°F to 12°F (5.5°C to 6.6°C) of superheat and
remove charge to lower the subcooling to 6 ± 2°F (3.3 ± 1°C)
5. Disconnect manifold set, installation is complete.
NOTE: Do not adjust charge based on suction pressure unless there is a gross undercharge.
CAUTION
Unit Damage Hazard: Failure to follow this caution may result in equipment damage.
Never charge liquid into the low-pressure side of system. Do not overcharge. During charging or removal of
refrigerant, be sure indoor fan system is operating. Ensure outdoor fan motors are running.

Start Unit DuraSea Condenser Installation, Start-Up & Service Manual
18 L-3153
Figure 7: Blocking Outdoor Coil
Outdoor Temp Less Than 65°F (18°C)
1. When outdoor ambient temperature is below 65°F (18°C) it may be necessary to restrict the condenser air flow to
achieve normal operating pressures in the 325 to 375 psig (2240 to 2585 kPa) range. These pressures are necessary
for checking the charge. Block equal sections of the outdoor coil on all coil sides until the liquid pressure is in the 325
to 375 psig (2240 to 2585 kPa) range (see Figure 7).
2. Charge the unit following the steps listed for “Outdoor Temp 65°F (18°C) or Higher” on page 17.
NOTE: Accurate pressure gauge and temperature sensing devices are required. System overcharge with refrigerant can lead to
catastrophic failure. Symptoms are high head, high running current, low superheat, and high subcooling.
SYSTEM OPERATION
The outdoor unit and indoor blower cycle are on demand from the room thermostat. When the thermostat blower switch is in the
ON position, the indoor blower operates continuously. Ensure that all safety controls are operating, control panel covers are on,
and the service panels are in place.