Dometic EnviroComfort ECD User manual

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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 Marine. Every precaution has
been taken in the preparation of this manual to ensure its accuracy. However, Dometic Marine 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.
EnviroComfort (ECD)
INSTALLATION MANUAL
EnviroComfort Kit
Dometic Marine
Rev. 20111108
L-2657 English

L-2657 ENGLISH
Table of Contents
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
THIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
THIS PRODUCT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
How It Works . . . . . . . . . . . . . . . . . . . . . . . . . . 1
The Effect of Seawater Temperature . . . . . 1
Kit Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Tools Required for Installation . . . . . . . . . . . . . 2
UNPACKING AND INSPECTION . . . . . . . . . . . . . . . . . . . 2
INSTALLATION PROCEDURES . . . . . . . . . . . . . . . . . . 3
VERY IMPORTANT SAFETY CONSIDERATIONS . . . . . . . . 3
Avoid Harmful Vapors . . . . . . . . . . . . . . . . . . . . 3
Electrical Shock Hazard . . . . . . . . . . . . . . . . . . 3
Other Hazards . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION CHECKLIST . . . . . . . . . . . . . . . . . . . . . . 3
Air Conditioner Unit Mounting . . . . . . . . . . . . . . 3
Grilles and Ducting . . . . . . . . . . . . . . . . . . . . . . 4
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Seawater Cooling System . . . . . . . . . . . . . . . . 4
PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Placement Of System . . . . . . . . . . . . . . . . . . . . 4
Installation Notes . . . . . . . . . . . . . . . . . . . . 6
Ducting Route . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Spacing Allowances & Unit Dimensions . . . . . . 7
INSTALLING THE MOUNTING BRACKETS . . . . . . . . . . . . 8
INSTALLING THE CONDENSATE DRAINS . . . . . . . . . . . . 8
Installing a Trap . . . . . . . . . . . . . . . . . . . . . . . . 9
ROTATING THE BLOWER . . . . . . . . . . . . . . . . . . . . . . . 9
Horizontal Discharge . . . . . . . . . . . . . . . . . . . . 9
Vertical Discharge . . . . . . . . . . . . . . . . . . . . . . . 9
INSTALLING THE ELECTRICAL BOX . . . . . . . . . . . . . . 10
INSTALLING THE AIR GRILLES . . . . . . . . . . . . . . . . . . 10
INSTALLING THE DUCTS . . . . . . . . . . . . . . . . . . . . . . 10
INSTALLING THE CONTROL PANEL . . . . . . . . . . . . . . 11
Digital Control Panel . . . . . . . . . . . . . . . . . . . . 11
ELECTRICAL CONNECTIONS, GROUNDING & BONDING 11
Terminal Strip . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . 11
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Electrical ABYC Standards . . . . . . . . . . . . . . .12
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . 13
INSTALLING SEAWATER PUMP AND PLUMBING . . . . . . 14
Circulation Pump . . . . . . . . . . . . . . . . . . . . . . .14
Mounting Requirements. . . . . . . . . . . . . . 14
Seawater Speed Scoop . . . . . . . . . . . . . . . . . .14
Seawater Strainer . . . . . . . . . . . . . . . . . . . . . . 14
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
REVIEW THE INSTALLATION CHECKLIST . . . . . . . . . . . 15
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
OPERATION OF THE DIGITAL CONTROL PANEL . . . . . .16
Initial Startup . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
TROUBLESHOOTING GUIDELINES . . . . . . . . . . . . . . . . 16
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
REVERSING VALVES . . . . . . . . . . . . . . . . . . . . . . . . . 17
SEAWATER STRAINER . . . . . . . . . . . . . . . . . . . . . . . . 17
CONDENSER COIL CLEANING . . . . . . . . . . . . . . . . . . . 17
RETURN-AIR FILTERS . . . . . . . . . . . . . . . . . . . . . . . . 18
WINTERIZATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
OWNERS LIMITED WARRANTY . . . . . . . . . . . . . . . . .18
SECTION I - WHAT’SCOVERED . . . . . . . . . . . . . . . . . 18
SECTION II - WHAT’SNOT COVERED . . . . . . . . . . . . . 19
SECTION III - COVERAGE PERIOD . . . . . . . . . . . . . . . 20
SECTION IV - GETTING SERVICE . . . . . . . . . . . . . . . . 20
TABLE OF WARRANTY PERIODS . . . . . . . . . . . . . . . . . 21

EnviroComfort Installation Manual This Manual
L-2657 ENGLISH 1
INTRODUCTION
THIS MANUAL
This manual provides proper installation information for the EnviroComfortTM air conditioning system. Where applicable, be sure
to follow the instructions that pertain to your model. Improper installation procedures can result in unsatisfactory performance
and/or premature failure of the air conditioning unit.
Before proceeding, read this manual completely. If there are any statements or procedures in this manual that you do not
understand, contact the Applications Department of Dometic Marine for assistance. Phone [phone] Monday through
Friday, 8:00am - 5:00pm Eastern Time. After hours (evenings and weekends) technical support is offered through Dometic's
24/7 Hotline at [phone], or by fax at 954-973-2477, or by email at sal[email protected].
In the interest of product improvement, Dometic’s specifications and design are subject to change without prior notice.
THIS PRODUCT
The EnviroComfort air conditioning system provides year-round comfort on your boat with both cooling and heating capabilities.
A compact Dometic Digital Display temperature control operates the system. For flexibility in connecting to ductwork, the high-
velocity blower is rotatable to either a horizontal or vertical position. The compact, space-saving design is contained in a
stainless-steel drain pan, and the pre-installed air filter is easily removable and cleanable. The plastic electrical box is remote-
mountable for added convenience.
HOW ITWORKS
The basic principle of an air conditioning system is a liquid absorbs heat as it turns into a gaseous state (evaporates) and
releases heat as it turns back into a liquid state (condenses). The system consists of five main components:
•Evaporator - Absorbs heat from air flowing across the coil.
•Fan or Blower - Blows air across the evaporator coil.
•Condenser - Releases heat to the seawater.
•Compressor - Drives the refrigerant through the loop.
•Metering Device - Meters the flow of refrigerant to the evaporator.
The air conditioner’s refrigerant compound has a very low boiling point. It flows in a closed loop between an evaporator and a
condenser, alternately absorbing and releasing heat. The heat absorbed by the refrigerant is transferred to the seawater. This
process cools and dehumidifies a space by removing heat and moisture, replacing hot moist air with cool dry air. The moisture it
removes condenses and drips into a collection pan, where it drains away. There should be a temperature difference of 15 to 20
degrees from the return air to the supply air.
A water pump circulates seawater through the inner tube in the condenser coil, which cools the refrigerant in the outer tube and
condenses it from a gas into a liquid. The heat from the refrigerant is exchanged to the seawater and discharged overboard.
The liquid refrigerant is then pumped through the evaporator coil and the cycle repeats.
When in Heating Mode, a reversing valve in the refrigerant line reverses the flow and the evaporator and condenser change
roles. Heat is absorbed from seawater and released into conditioned space.
The Effect of Seawater Temperature
Whether in Cooling Mode or Heating Mode, the temperature of the seawater affects the air conditioner’s efficiency and capacity.
In Cooling Mode, the system is most efficient when the water temperature is 55-80°F (13-27°C). At water temperatures above
90°F (32°C), the water’s ability to absorb heat diminishes, so the capacity of the system decreases. Also, when water
temperature increases above 90°F (32°C), the system could sustain a high-pressure shutdown to protect the compressor.
In Heating Mode, the system is most efficient when the water temperature is above 50°F (10°C). At water temperatures of 40°F
(4.4°C) or below, the water’s ability to provide heat diminishes, so the capacity of the system decreases. Also, as the water
temperature decreases, the system could sustain a low-pressure shutdown to protect the compressor.
CAUTION
Extreme care should be taken in operating any unit below seawater temperatures of 40°F (4.4°C). The seawater could
freeze in the condenser tubing, possibly causing it to burst, which is not covered by the warranty.

Unpacking and Inspection EnviroComfort Installation Manual
2L-2657 ENGLISH
KIT CONTENTS
EnviroComfort is a complete marine air conditioning kit that includes everything needed for a professional installation. Each kit
includes:
• Air conditioning unit with electrical box
• Dometic Digital Display temperature-control device
• Ducting
• Supply-air grille
• Return-air grille
• Seawater pump
• Strainer
• Speed scoop thru-hull
• Overboard fitting
• Seawater hose
• Fittings for pump and strainer
TOOLS REQUIRED FOR INSTALLATION
• Screwdrivers - both types
• Pliers
• Pipe wrench
• Wire cutters/crimpers
• Drill & 7/8" bit
• Power screwdriver
• Jig saw
• Hull saw
•Ducttape
• Electrical tape
• Teflon tape
• Marine-grade waterproof (below waterline) bedding compound to seal thru-hull fittings
• Hardware to secure unit, pump, strainer, grilles, electrical box and control panel
UNPACKING AND INSPECTION
Before attempting to install your new air conditioning system, you must read this installation manual completely.
Failure to perform certain tasks in the proper sequence could result in an inoperative system as well as a voided warranty.
If, upon opening your new system, you discover any parts are missing, contact your dealer immediately. Check all items
carefully against the packing list to ensure all cartons have been received. Move units in the normal “up” orientation as indicated
by the arrows on each carton. Examine cartons for shipping damage, removing the units from the cartons if necessary. If the unit
is damaged, the carrier should make the proper notation on the delivery receipt acknowledging the damage.

EnviroComfort Installation Manual Very Important Safety Considerations
L-2657 ENGLISH 3
INSTALLATION PROCEDURES
VERY IMPORTANT SAFETY CONSIDERATIONS
This manual contains essential safety information concerning the safe and proper installation and operation of the
EnviroComfort direct-expansion air conditioner. It is very important that you read and understand the contents of this
manual thoroughly before attempting to install any Dometic equipment.
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
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.
INSTALLATION CHECKLIST
Review this list prior to and after installation.
AIR CONDITIONER UNIT MOUNTING
• Not in engine room or bilge areas, must be sealed away from exhaust or fumes.
• Proper spacing allowed around unit.
• Attached to solid, level platform with four hold-down clips provided.
• Condensate drain line routed aft and down hill to a sealed sump (not bilge), and should have a trap.
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 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
This component does not meet Federal requirements for ignition protection. Do not install in spaces containing
gasoline engines, tanks, LPG/CPG cylinders, regulators, valves or fuel line fittings. Failure to comply may result in
injury or death.
CAUTION
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.
NOTE
United States federal law prohibits the intentional release of refrigerant gases into the environment, including the
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.

Preparation EnviroComfort Installation Manual
4L-2657 ENGLISH
GRILLES AND DUCTING
• Supply-air grille mounted as high as possible.
• Return-air grille mounted as low and as close to the unit as possible.
• Return-air grille mounted away from exhaust and bilge vapors.
• Ducting is pulled taut, straight and properly connected with no excess.
ELECTRICAL
• If pump wires need to be extended by butt connections, make sure they are tightly crimped and heat shrunk.
• AC power source installed and grounded/bonded in accordance with ABYC standards.
• Connect control wires to terminal strip with ring terminals.
SEAWATER COOLING SYSTEM
• Speed scoop located as far below the water line and as close to the keel as possible, with the scoop’s strainer facing
the bow. (See section C of Figure 1: Kit Installation Diagram, page 5.)
• Shut-off valve and speed scoop properly sealed and tight.
• Seawater pump at least one foot (305mm) below water line and securely mounted.
• Strainer mounted below pump with access to filter.
• Double/reversed stainless steel hose clamps on all hose connections.
• Teflon tape on all threaded connections.
• Hose runs uphill from speed scoop to strainer, pump and air conditioning unit.
• Water flowing freely and steadily from overboard discharge while pump is running.
PREPARATION
PLACEMENT OFSYSTEM
Selecting a good location for your air conditioner is the most important part of your preparation. 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.
Install the unit as low as possible (such as under a V-berth, dinette seat or in the bottom of a locker) and duct the supply air as
high as possible to create an ideal air-flow condition. This type of installation prevents short or premature cycling.
Position the unit on a firm, level, horizontal surface and run the condensate drain line downward from the unit to a suitable drain
location.
Plan all connections, including ducting, condensate drain, seawater in and out, electrical power connections, location of control,
and seawater pump placement, to assure easy access for routing and servicing.
If your kit is supplied with a filtered return-air grille, the filter attached to the unit’s evaporator must be removed. Two filters are
not better than one, as the reduced air flow will decrease performance and possibly freeze the evaporator coil.
See Figure 1: Kit Installation Diagram, page 5 for an overview of the entire installation and Table 1: List of Parts Referenced in
Kit Installation Diagram, page 6.
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 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.

EnviroComfort Installation Manual Preparation
L-2657 ENGLISH 5
Figure 1: Kit Installation Diagram
See Table 1: List of Parts Referenced in Kit Installation Diagram on page 6.
Read “Installation Notes” on page 6.
A: DUCT KIT INSTALLATION
B: SEAWATER KIT INSTALLATION C: SEAWATER INTAKE DETAIL
Seawater Intake
(see detail at right)
AB
C
D
EF
G
HI
J
K
L
M
N
O
P
Q
R
S
Condensate drain to sump
Seawater inlet
Seawater outlet
NOTE:
Blower is rotated
to vertical position.
GL
H
Speed scoop
mounting nut
Backing plate
(not included)
Bedding compound for use
below water line (not included).
(Apply liberally to both sides
and inside the hole.)
Hull
(forward)

Preparation EnviroComfort Installation Manual
6L-2657 ENGLISH
Installation Notes
Duct Kit Installation
1. Do not install air conditioner in bilge or engine room areas. Do not terminate condensate drain line in bilge or any area
that may be exposed to engine or generator exhaust fumes.
2. Install return-air grill low and supply-air grille high; supply-air grille should not blow toward return-air grille.
3. Install ducting as smooth and taut as possible, trim any excess, avoid any unnecessary bends or loops.
Seawater Kit Installation
Refer to Figure 8: Seawater Pump & Plumbing Diagrams, page 15.
1. Seawater system must have a steady upward flow from inlet to air conditioner, as shown in Figure 8, page 15.
2. Hoses must not have kinks, loops, or high spots where air can be trapped.
3. Pump and strainer must be below water line.
Table 1: List of Parts Referenced in Kit Installation Diagram
LEGEND AMOUNT DESCRIPTION
A 12.5’ (3.8m) Insulated Ducting
B 1 Supply-Air Grille (the smaller grille in kit)
C 1 Return-Air Grille, filtered (the larger grille in kit)
D 4 Mounting Bracket (see Figure 3, page 8)
E 1 Thru-Hull, plastic 5/8”
F 25’ (7.62m) Seawater Hose, 5/8”
G 1 Air Conditioning Unit
H 3 Adapter, PVC 1/2” MPT x 1/2” HB
I (Pump
PML 250) 2 Adapter, PVC 1/2” FPT x 1/2” HB
I (Pump
PML 500) 1 Adapter, PVC 1/2” FPT x 1/2” HB
1 Adapter, PVC 3/4” MPT x 1/2” HB
1 Coupling, PVC 3/4” FPT x 3/4” FPT
J 1 Strainer with Bracket (1/2” FPT)
K 1 Hose Barb Drain Kit (see Figure 4, page 9)
L 1 Remote Electrical Box
M 1 Seawater Pump, PML250 (6K-12K units) or PML500 (16K units)
N 17 Hose Clamp
O 1 Ball Valve, bronze 1/2”
P 1 Speed Scoop, bronze 1/2”
Q 1 Digital Control Panel
R 1 Electrical Harness
S 1 Pump Power Harness

EnviroComfort Installation Manual Preparation
L-2657 ENGLISH 7
4. Speed scoop should be installed as far below the water line and as close to the keel as possible, facing forward.
5. Avoid or minimize 90-degree bends or elbows as much as possible. Rotate pump head toward direction of water flow.
6. Electrical connections for power to unit and pump are to be made by qualified personnel only.
DUCTING ROUTE
Good airflow is critical for the performance of the entire system.
Plan the ducting route to run as straight, smooth, and taut as possible, minimizing the number of 90-degree bends. (Two tight
90-degree bends can reduce airflow by 25 percent.)
SPACING ALLOWANCES & UNIT DIMENSIONS
The following space allowances are suggested minimums. Always allocate enough space for installation and serviceability. See
Table 2: Unit Dimensions, page 7 and Figure 2: Spacing Allowances & Unit Dimensions for Mounting, page 8.
Plan for these space allowances when mounting the unit:
1. Allow a minimum of 6" (152mm) around the perimeter of the unit in the area of the seawater and condensate drain
piping.
2. Allow a minimum of 3" (76mm) of air space in front of the evaporator coil for the return-air intake if it is adjacent to a
bulkhead.
3. Allow a minimum of 3" (76mm) of air space for the electric blower motor ventilation.
4. For flexible ducting connection, allow 2" (51mm) for the duct ring, 1" (25mm) for the duct bend radius, and add
diameter of the ducting to get the total clearance distance (2" [51mm] + 1" [25mm] + duct diameter) as measured from
the blower outlet (this also applies to clearance needed behind the supply-air grille).
NOTE
United States federal law prohibits the intentional release of refrigerant gases into the environment, including the
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.
Table 2: Unit Dimensions
DIMENSIONS
UNIT CAPACITIES
6,000 BTU
IN/MM
10,000 BTU
IN/MM
12,000 BTU
IN/MM
16,000 BTU
IN/MM
A - Duct Size 4.0/102 6.0/153 6.0/153 6.0/153
B - Base Depth 8.0/204 8.75/223 8.75/223 10.25/261
C - Overall Depth 9.0/229 9.63/245 9.63/245 11.25/286
D - Width 16.0/407 22.0/559 22.0/559 22.0/559
E - Height 11.25/286 13.50/343 13.50/343 13.5/343

Installing The Mounting Brackets EnviroComfort Installation Manual
8L-2657 ENGLISH
Figure 2: Spacing Allowances & Unit Dimensions for Mounting
For specific measurements, see Table 2: Unit Dimensions, below .
INSTALLING THE MOUNTING BRACKETS
The air conditioning unit is supplied with a base pan that also serves as a condensate pan. Use the mounting-clip brackets and
screws (4) to secure the base pan onto a flat, horizontal surface. See Figure 3: Mounting Bracket, below.
Figure 3: Mounting Bracket
INSTALLING THE CONDENSATE DRAINS
The condensate drain pan is 2.0” (51mm) high with two drain locations. During conditions of high humidity, condensate may be
produced at a rate of approximately one-half gallon (1.9 liter) per hour. With this in mind, it is important to route condensate
drains downward to a sump pump. It is not recommended to route condensate drains to the bilge.
After the condensate drain installation is complete, test the installation by pouring one quart (liter) of water into the pan and
checking for good flow.
To install the condensate drain:
1. Remove the aft-facing watertight plug from the base pan of the air conditioning unit.
2. Slip the solid washer and the liquid-seal washer onto the PVC fitting in that order. (See Figure 4: Condensate Drain Kit,
page 9.)
3. Connect the fitting through the exposed hole in the base pan with the locking nut.
4. Securely tighten using two (2) wrenches to provide a proper seal.
3” (7.62 cm) Space allowance for
return-air intake if adjacent to
bulkhead Refrigerant connection
(allow space for access)
EVAPORATOR &
CONDENSER COIL
DUCT
RING
ELEC
BOX
ROTARY
COMP
TOP VIEW
SIDE VIEW BACK VIEW
6” (15.2 m) Space
allowance for
seawater piping
3” (7.62 cm) Space
allowance for electric
blower-motor ventilation
A) Duct
size
1” (2.54cm)
2” (5.08 cm)
Total
min
clearance
Standard
blower position
as shipped
Possible
drain line
location
Remove 7 screws to
rotate blower
BLOWER
D) Width
E) Height
B) Base depth
C) Overall depth
NOTE:
Blower shown in
vertical position
EnviroComfort Unit
Base pan
Mounting bracket