Mars Air Systems L-2254 Owner's manual

Direct Expansion Systems
Revised: 7-18-05
L-2254
vector compact
Installation & Operation

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L-2254
TABLE OF CONTENTS
Table of Contents
IF YOU HAVE A DIGITAL CONTROL ......................................................................................................... 3
Introduction
How It Works ............................................................................................................................................... 4
Installation
Unpacking and Inspection .......................................................................................................................... 5
Safety Considerations ................................................................................................................................ 5
Placement of System ................................................................................................................................. 5
Condensate Drains..................................................................................................................................... 6
Blower Assembly ........................................................................................................................................ 6
Mounting Brackets ...................................................................................................................................... 6
Supply & Return Air Grilles and Transition Boxes...................................................................................... 6
Ducting........................................................................................................................................................ 6
Seawater Pump and Plumbing .................................................................................................................. 7
Electrical Connections, Grounding and Bonding ....................................................................................... 8
Manual Control Panel (MCP) Installation ................................................................................................... 8
Installation Checklist (Review prior to installation) ..................................................................................... 9
Operation
Mechanical Control Panel (MCP) Operation ............................................................................................ 10
Quick Start Operations Checklist ............................................................................................................. 10
Troubleshooting
General Troubleshooting .......................................................................................................................... 11
Digital Controls Troubleshooting .............................................................................................................. 12
MCP Mechanical Control Panel Troubleshooting ....................................................................................14
Maintenance
Winterization ............................................................................................................................................. 15
Manufacturers Limited Warranty Agreement 16
Description of Figures 17
Distributor Listing 27
Copyright 2005 Dometic Environmental Corporation, All Rights Reserved - Every precaution has been taken in the preparation of this manual to insure its accuracy. However, Dometic
assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of this product and information contained herein.
IF YOU HAVE A DIGITAL CONTROL
Please refer to either the Elite Control manual (L-2230) or the Passport I/O Control manual (L-2231) for installation and
operation of those digital control panels. Mechanical control information and wiring diagrams for both types of controls
are in this manual.

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L-2254 Introduction
INTRODUCTION
Congratulations on the purchase of your Marine Air
Systems’ Vector Compact
®
air conditioner. No matter
which of the following features was the reason for your
purchase of this air conditioner, we are sure it will meet
your needs and will give you many years of efficient and
trouble free use. The Vector Compact self-contained
direct expansion air conditioners are designed for marine
applications incorporating the following features:
• Patented compact design with the condenser coil in
the evaporator shroud
• High efficiency rotary compressor or scroll (24K)
compressors
• Cupronickel condenser coil
• Enhanced fin designed evaporator coil
• 2" deep drain pan with multiple condensate drain
locations
• Anti-vibration base pad
• Pre-charged and pre-wired systems for easy
connections
• Rotatable blower assembly
• Charge Guard® ensures environmental protection
and system integrity
This manual is intended to provide the information
necessary to ensure proper installation, operation, and
maintenance of the unit. The figures that are referenced
throughout this manual can be found immediately after
the warranty section. Improper installation or misunder-
stood operating procedures can result in unsatisfactory
performance and/or premature failure of these units, so
before proceeding
please read this manual completely.
The Vector Compact units are covered under the existing
Dometic Environmental Corporation (Dometic) warranty
policy contained in this manual. In the interest of product
improvement, Dometic’s specifications and design are
subject to change without prior notice.
Clean Air Act Amendments of 1990
[Title VI - Section 608(C-1)]
“Effective July 1, 1992, it shall be unlawful for any
person, in the course of maintaining, servicing, repairing,
or disposing of an appliance or industrial process
refrigeration, to knowingly vent or otherwise knowingly
release or dispose of any Class I* or Class II** sub-
stance used as a refrigerant in such appliance (or
industrial process refrigeration) in a manner which
permits such substance to enter the environment. De
minimis releases associated with good faith attempts to
recapture and recycle or safely dispose of any such
substances shall not be subject to the prohibition set
forth in the proceeding sentence.”
* Class I substances include CFC-12
** Class II substances include HCFC-22
Marine Air Systems
Marine Air Systems (MAS) is a product of Dometic
Environmental Corporation. Dometic is a recognized
leader in the design and manufacture of high-perfor-
mance comfort control systems, refrigeration products
and battery charging products for demanding environ-
ments, including commercial and recreational marine
craft, vehicles and other applications. We offer an
unparalleled scope of products, dealer networks, applica-
tions support, engineering resources and production
capabilities throughout the world. Our team has many
years of experience in the design, manufacture, applica-
tion and support of our products. Our practical experi-
ence and design capability allows our application
engineers and sales representatives to offer optimum
solutions for your environmental control requirements.
Product lines also include well known Cruisair, Grunert,
and Sentry.
How It Works
Your self-contained air conditioner consists of four main
components and a refrigerant gas circulating through the
system. The BLOWER draws warm cabin air across the
fins on the EVAPORATOR where the heat from the air is
transferred to the refrigerant in the evaporator coil. As
the refrigerant evaporates from a liquid into a gas it
absorbs the heat from the cabin air. The COMPRESSOR
then compresses the refrigerant gas and pumps it
through the outer tube in the CONDENSER COIL. The
seawater pump circulates cool seawater through the
inner tube in the condenser coil, this cools the refriger-
ant and condenses it into a liquid. The heat from the
refrigerant is exchanged to the seawater and discharged
overboard. The liquid refrigerant is then passed through
the EVAPORATOR COIL and the cycle repeats. Remov-
ing heat from the cabin air lowers its temperature. The
cooled air is blown through the ducting and out the
supply air grille(s). For reverse cycle heating, the refriger-
ant flows in the opposite direction through the reversing
valve. Heat is transferred from the seawater in the
condenser coil to the refrigerant and then to the air
blowing through the evaporator into the cabin. Seawater
temperature will directly affect the a/c unit’s efficiency.
This a/c unit can effectively cool your boat in water
temperatures up to 90°F and heat in water temperatures
as low as 40°F. See Figure 1.

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L-2254 Installation
Unpacking and Inspection
When the equipment is received, all items should be
carefully checked 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.
CAUTION: When unpacking and installing the 3-knob
control (if mechanical option is used), care must be
taken not to kink or break the copper cap tube when
uncoiling the sensing bulb. The cap tube is hollow and
kinking or sharp bends will inhibit system operation.
Safety Considerations
VERY IMPORTANT: Never install your air conditioner
in the bilge or engine room areas. Insure that the
selected location is sealed from direct access to
bilge and/or engine room vapors. Do not terminate
condensate drain line within three (3) 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.
Installation and servicing of this system can be hazard-
ous 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. The following is a summary of
the labels on the unit:
Danger
Electrical shock hazard. Disconnect voltage at main
panel or power source before opening any cover.
Failure to comply may result in injury or death.
Warning
This component does not meet federal require-
ments 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.
INSTALLATION
Notice
This component is charged with hydrochloro-fluorocarbon
(HCFC) refrigerant R22. Effective July 1, 1992 it shall be
unlawful for any person to knowingly vent or otherwise
knowingly release any class 1 (CFC) or class 2 (HCFC)
substance as a refrigerant in a manner which permits
such substance to enter the atmosphere per the clean
air act of 1990. Public law 101-549 Title IV Section 608-
C. Failure to comply may result in severe penalties,
including fines and imprisonment.
Warning
To minimize the hazard of electrical shock and
personal injury, this component must be effectively
grounded. Refer to the installation guidelines for
further information.
Caution
High compressor temperature is normal.
Do not touch.
Placement of 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 has a tendency to
fall, it is highly recommended that you locate the supply
air grille as high as possible in the cabin. See Figures 2
and 3.
The Vector Compact unit should be installed as low as
possible, BUT NEVER IN THE BILGE OR ENGINE
ROOM AREAS. INSURE THAT THE SELECTED LOCA-
TION IS SEALED FROM DIRECT ACCESS TO BILGE
AND/OR ENGINE ROOM VAPORS. Installing the unit as
low as possible (such as under a V-berth, dinette seat or
bottom of a locker) and ducting the supply air as high as
possible, creates an ideal airflow condition. This type of
installation will prevent short or premature cycling.
The unit should be positioned on a firm, level, horizontal
surface and the condensate drain line should run
downward from the unit to a suitable drain location. Plan
all connections which must be made 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.