vector compact
Installation & Operation
Direct Expansion Systems
Revised: 7-18-05
L-2254
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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
Description of Figures
16
17
27
Distributor Listing
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.
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.
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L-2254
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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:
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.
• 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
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.
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
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L-2254 Introduction
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INSTALLATION
Notice
Unpacking and Inspection
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.
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.
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.
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.
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.
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:
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.
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.
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.
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.
L-2254 Installation
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utilized. This will help to prevent water from standing in
the pan. See item 7 for instructions on connecting two
drain lines.
Minimum Tools Required
• Screws drivers
• Pliers
IMPORTANT! 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.
• Pipe wrenches
• Wire cutters/crimpers
• Drill and assorted bits
• Jig saw
• Duct tape
Blower Assembly
• Electrical tape
With the Vector Compact you can achieve multi-direc-
tional supply air discharge from a single unit by rotating
the blower to the desired location. It is ideal for tight
installations as 130° of rotation are available with which
to position the blower. Its advanced design allows the
blower to be easily removed for rotating or servicing by
removing the two mounting ring screws and the screws
attaching the blower to the drain pan. Rotate the blower
to allow the most direct flow of air to the supply air grille.
Reinstall the mounting screws. Plug any unused screw
holes in the blower to prevent air loss.
• Teflon tape
• Beding compound to seal thru hull fittings
• Hardware to secure unit, pump, strainer, grilles &
control panel
Condensate Drains
The condensate drain pan is 2" high with up to four drain
locations. During conditions of high humidity, condensate
may be produced at a rate of approximately 1/2 gallon
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 a quart of water into the pan
and checking for good flow. See Figure 4.
Mounting Brackets
The a/c unit is supplied with a base pan that also serves
as a condensate pan. Mounting clip brackets are pro-
vided to secure the base pan onto a flat, horizontal
surface. See Figure 5.
For installation of the condensate drain:
Supply & Return Air Grilles
and Transition Boxes
1. Remove the aft facing watertight plug from the base
pan of the a/c unit (see note).
Install the supply air grille as high as possible in a
location that will provide uniform air distribution through-
out the cabin, grille louvers should be directed upward.
The return air grille should be installed as low and close
to the a/c unit as possible to insure direct uninterrupted
airflow to the evaporator. The return air grille should have
a minimum four inches (4") of clearance in front of it,
free from any furniture or other obstructions. In no
instance should a supply air discharge be directed
towards a return air grille, as this will cause the system
to short cycle. Allow for adequate clearance behind the
supply air grille(s) for the transition box and ducting
connection. The table in Figure 8 shows minimum grille
sizes. See the MAINTENANCE section of this manual for
return air filter cleaning instructions.
2. Slip the solid washer and the liquid-seal washer onto
the PVC fitting in that order.
3. Connect the fitting through the exposed hole in the
base pan with the locking nut.
4. Securely tighten with two (2) wrenches to provide a
proper seal.
5. Attach a 5/8" I.D. reinforced hose to the hose barb and
secure with stainless steel hose clamps.
6. Install the condensate drain hose downhill from the
unit and aft to a sump.
7. Two drain fittings may be used and the hoses teed
together provided there is a minimum 2" drop form the
bottom of the base pan to the tee connection.
Ducting
Good airflow is critical for the performance of the
entire system. It is highly dependent on the quality of
the ducting installation. The ducting should be run as
straight, smooth and taut as possible minimizing the
number of 90° bends (two tight 90° bends can reduce
airflow by 25%). The table in Figure 8 shows minimum
Note: The reason to use the "aft facing" drain location is
so that water will tend to drain out of the pan when the
vessel is under way. However, the boat owner should
inspect the pan when the vessel is at rest. If water is
collecting in the pan along an edge other than "aft
facing", then the drain on that edge should also be
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L-2254 Installation
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duct diameters and their corresponding supply and
return air grille minimum area in square inches. If a
transition box is used, the total area of supply air ducts
going out of the box should at least equal the area of
the supply duct feeding the box. To calculate the square
inch area of a round duct, multiply the radius by itself (r2)
and multiply that number by 3.1416(π). See Figure 8.
line and as close to the keel as possible in any
application, but especially on a sailboat, to keep the
intake in the water when the boat heels over so that
air does not get into the system. (See Figure 7 for
proper installation.)
The speed scoop intake must face forward and not be
shared with any other pump. A seawater strainer is
mandatory between the shut off valve (seacock) and the
pump to protect the pump from any foreign matter.
Failure to install a seawater strainer will void the
pump warranty. The seawater system should be in-
stalled with an upward incline from the speed scoop &
seacock, through the strainer, to the inlet of the pump
and then up to the inlet of the a/c unit’s condenser coil.
The discharge from the a/c unit should then run to the
seawater outlet thru-hull fitting which should be located
where it can be visually checked for water flow and as
close as practicable to the waterline to reduce noise. All
hose connections shall be secured by means of double/
reversed stainless steel hose clamps. Use teflon tape on
all threaded connections. The following is a summary of
the seawater system installation:
The following is a summary of proper ducting connections:
1. Pull back the fiberglass insulation exposing the inner
mylar duct hose.
2. Slide the mylar duct hose around the mount ring until
it bottoms out.
3. Screw 3 or 4 stainless steel sheet metal screws
through the duct hose into the transition ring.
Make sure to catch the wire in the duct hose with the
heads of the screws. Do not use band clamps, as the
hose will slide off.
4. Wrap duct tape around the ducting and ring joint to
prevent any air leaks.
5. Pull the insulation back up over the mylar to the ring
and tape this joint.
1. Install the speed scoop thru-hull inlet as close to the
keel and as far below the water line as possible, facing
forward. Bed the scoop with a marine sealant de-
signed for underwater use.
6. Remove excess ducting and use the same connection
method at the supply air grille.
2. Install a bronze, full flow seacock on the speed scoop
thru-hull inlet.
All ducting should:
3. Install a seawater strainer below the level of the pump
with access to filter.
• Be appropriately sized for each application.
• Run as smoothly and taut as possible.
• Have as few bends or loops as possible.
4. Mount the pump above the strainer and at least one
foot below the waterline.
• Be securely fastened to prevent sagging during boat
operation.
5. Connect the seacock and strainer with an uphill run of
reinforced marine grade hose.
• Have all excess ducting lengths trimmed off.
• Not be flattened or kinked.
6. Connect the discharge from the pump uphill to the
bottom inlet of the a/c unit’s condenser coil with 5/8"
hose. Connect the discharge from the condenser coil
to the overboard discharge thru-hull fitting with 5/8"
hose.
• Insulated when located in high heat load areas (hull
side, mechanical compartments, etc.).
• Be properly protected against potential damage
when routed through open areas.
7. Avoid loops, high spots or the use of 90° elbows with
seawater hose (each 90° elbow is equivalent to 2.5' of
hose and a 90° elbow on the pump outlet is equivalent
to 20' of hose).
Seawater Pump and Plumbing
Several guidelines should be followed during the installa-
tion of the seawater system. Since the circulation pump
is centrifugal and not self-priming, it must be mounted so
that it is always at least one foot below the water line
regardless of which tack the vessel is on. Pump may be
mounted horizontally or vertically, however the discharge
must always be above the inlet. Pump head should be
rotated toward the direction of water flow. Install the
seawater speed scoop intake as far below the water
8. Double clamp all hose connections with stainless steel
clamps, reversing the clamps.
9. Use teflon tape on all threaded connections.
10. Connect all metallic parts in contact with seawater
to the vessel’s bonding system including the
speed scoop inlet, strainer, pump and the air
conditioner. Failure to do so will void warranty.
L-2254 Installation
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ABYC standards are available from:
Electrical Connections, Grounding
and Bonding
American Boat and Yacht Council
3069 Solomons Island Rd.
Edgewater, MD 21036
All a/c units have a terminal strip mounted inside the
electric box. The terminal strip is labeled for proper
connections of the electrical supply, ground wires and
pump circuits. A wiring diagram is provided in the
electrical box and in this manual. The wiring diagram in
the electrical box supersedes the one in this manual and
ABYC standards. The correct size circuit breaker should
be used to protect the system as specified on the a/c
unit’s data plate label. A minimum of 12 AWG boat cable
should be used to supply power to the a/c unit and the
seawater pump. All connections shall be made with ring
or captive fork terminals. Turn off a/c power supply
circuit breaker before opening electric box. See
Figures 9 and 10.
Telephone: (410) 956-1050
The a/c unit must be connected to the ship’s bonding
system to prevent corrosion due to stray electrical
current or voltage. All pumps, metallic valves and
fittings in the seawater circuit that are isolated from the
a/c unit by PVC or rubber hoses must be individually
bonded to the vessels bonding system also. This will
help eliminate any possibility of corrosion due to stray
current or voltage.
FAILURE TO PROPERLY GROUND AND BOND THE
SYSTEM WILL VOID WARRANTY!
Each a/c unit installed requires its own dedicated circuit
breaker. If there is only one a/c unit installed, the
seawater pump does not require a circuit breaker; the
wiring from the seawater pump is connected to the
terminal strip in the electric box. If two or more a/c units
use the same seawater pump, the pump wires will be
connected to a pump relay panel (PRP) which in turn
has its own dedicated circuit breaker sized for the pump
(20 amp max). Please see the wiring diagram furnished
with the PRP (NOTE: PRP triac must have its mounting
screw installed in order to dissipate heat). Electrical
connections in the bilge and/or below the waterline
should use heat shrink type butt splices.
3 Phase Notice
It is extremely important to insure that wiring and phase
sequencing of a three phase power source is correct.
Marine wiring standards call for power source phases L1,
L2, and L3 to be color-coded BLACK, WHITE, and RED,
respectively. These must be connected to the unit with
the proper sequence, otherwise, it will not operate
properly. If the wiring sequence is incorrect, the unit’s
compressor (Scroll type only) and pump (if applicable)
will run in the reverse direction at a significantly in-
creased noise level.
Field wiring must comply with ABYC electrical codes.
Power to the unit must be within the operating voltage
range indicated on the data plate. Properly sized fuses
or HACR circuit breakers must be installed for branch
circuit protection. See data plate for maximum fuse/circuit
breaker size (mfs) and minimum circuit ampacity (mca).
All units must be effectively grounded to minimize the
hazard of electrical shock and personal injury.
Manual Control Panel (MCP)
Installation
The MCP should be located within cap tube length of the
a/c unit. The 3 knob MCP is configured either vertically
(shown) or horizontally. The cut out size is 2.5" by 7.0",
see MCP (Figure 6) for orientation. Once the cut out is
made, carefully uncoil the copper cap tube with return air
sensor (copper bulb) and route the control wires and cap
tube through the hole and back to the a/c unit using
caution not to kink the cap tube. Mount the return air
sensor into the clips provided with the Vector Compact
unit. If the return air sensor cannot be mounted on the
evaporator coil, mount it behind the return air grille. The
sensor must be mounted in the return air stream. Make
electrical connections according to the wiring diagram
found in the electric box and/or in this manual. See
Figure 9.
The following are to be observed:
1. AC (alternating current) grounding (green wire) must
be provided with the AC power conductors and
connected to the ground terminal (marked “GRND”) at
the AC power input terminal block of the unit(s), per
ABYC standard E-8, or equivalent.
2. Connections between the vessel’s AC system ground-
ing conductor (green wire) and the vessel’s DC (Direct
Current) negative or bonding system should be made
as part of the vessel’s wiring, per ABYC standard E-9,
or equivalent.
3. When servicing or replacing existing equipment that
contains a chassis-mounted ground stud, the service
person or installer must check the vessel’s wiring for
the existence of the connection required in item 2
above.
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Installation Checklist
Electrical
❑
The wiring diagram is located in the electrical box. If
that diagram is damaged or if you need a copy, please
call Dometic with the unit part number, serial number,
and wiring diagram number, all of which are located on
the unit data plate.
(Review prior to installation)
Note: Refer to the Elite and Passport I/O manuals
for installation and operation of those digital
controls.
❑
❑
❑
❑
All butt connections on pumps wire tightly crimped and
heat shrunk
Seawater Cooling System
AC power source installed and grounded/bonded in
accordance with ABYC standards
❑
❑
❑
Speed scoop located as far below the water line and
as close to the keel as possible
Control wires connected to terminal strip with captive
fork or ring terminals
Shut off valve (sea cock) and speed scoop properly
sealed and tight
Circuit breakers sized according to specifications on
the data plate label
Seawater pump is at least one foot below water line
and securely mounted
❑
❑
Digital display cable is connected at both ends
❑
❑
Strainer mounted below pump with access to filter
Pump Relay Panel (if used) has a dedicated circuit
breaker sized for the pump but not to exceed 20 amps
maximum.
Double/reversed stainless steel hose clamps on all
hose connections
❑
❑
Teflon tape on all threaded connections
Hose runs uphill from speed scoop and sea cock to
strainer, pump and a/c unit, then downhill (if possible)
from a/c unit to overboard discharge
Grilles and Ducting
❑
Supply air grille mounted as high as possible
❑
Return air grille mounted as low and as close to the
a/c unit as possible
❑
❑
❑
Water flowing freely from overboard discharge while
pump is running
❑
❑
Return air grille mounted away from bilge vapors or
exhaust fumes
Pump relay panel, if used, must have its own circuit
breaker sized for the pump (20 amp max)
Ducting is pulled taut, straight, smooth and properly
connected with no excess
All metal fittings should be bonded
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 hold down clips
provided
❑
❑
Condensate drain routed aft and down hill to a sealed
sump (not bilge)
Blower rotated toward supply air grille
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OPERATION
Mechanical Control Panel
Quick Start Operations Checklist
❑
Ensure seawater intake ball valve (sea cock) is open.
(MCP) Operation
1. Ensure seawater intake ball valve (sea cock) is open.
❑
Turn on the a/c circuit breaker. If the seawater pump
has its own circuit breaker, turn that on.
2. Turn SYSTEM SWITCH control knob to OFF.
❑
❑
❑
Turn the system on.
3. Turn on AC circuit breaker. If the seawater pump has
its own circuit breaker, turn that on too. Or, if the pump
is connected to a Pump Relay Panel (PRP), then turn
on that circuit breaker also.
Set the desired cabin temperature (set point).
Check for a steady solid stream of water from the
overboard discharge.
4. Turn the SYSTEM SWITCH control knob to START;
this energizes the fan and seawater pump. Turn
THERMOSTAT control knob to the coolest position by
rotating fully clockwise. If system has reverse cycle,
turn knob counter-clockwise for heat.
❑
❑
Verify that there is steady airflow out of the supply air
grille.
If the unit does not appear to be operating properly,
refer to troubleshooting guide lines.
5. Check for a steady solid stream of seawater from the
overboard discharge.
Note: Do not turn the unit off and immediately turn it
back on. Allow at least 30 seconds for refrigerant
pressure equalization.
6. Turn FAN SPEED control knob clockwise to highest
setting for cooling or counter-clockwise for heating.
7. Verify that the fan is running and that there is steady
airflow out of the supply air grille.
8. Turn the SYSTEM SWITCH to RUN; this will start the
compressor. The indicator light on the control will
illuminate.
9. To set the thermostat, allow sufficient time for the unit
to cool/heat the area to the desired temperature. When
the area is sufficiently cooled/heated, turn the thermo-
stat knob slowly toward the center position until it
clicks once (the indicator light will turn off). The
thermostat is now set to maintain a constant tempera-
ture. While heating, if the ambient temperature is less
than 50°F, set the FAN SPEED control knob to low for
five to ten minutes until the unit begins to heat well,
then increase the fan speed for more heat output and
to prevent the system cycling on high pressure.
The thermostat on the MCP control panel serves to cycle
the compressor on and off and provide an automatic
changeover from cooling to heating (reverse cycle only)
with a 3.5° differential. Rotating the thermostat to the left
after it has been set for cooling will cause the unit to
heat. If you rotate the thermostat to the right, the unit will
cool. If the thermostat is left stationary after being set,
the unit will cycle from cooling to neutral, or heating to
neutral depending on the requirement.
Reverse cycle units have a reversing valve that must be
energized periodically to keep the internal parts moving
freely. To accomplish this, switch the A/C into HEAT for a
few seconds once a month.
Note: Do not turn the unit off and immediately turn it
back on. Wait at least 30 seconds.
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TROUBLESHOOTING
5. Seawater temperature too high for cooling or
too low for heating.
General Troubleshooting
Also see specific digital or mechanical control
troubleshooting sections following these general
guidelines.
Seawater temperature will directly affect a/c unit's
efficiency. This a/c unit can effectively cool your boat
in water temperature up to 90°F and heat (if reverse
cycle option is installed) in water as low as 40°F.
Fault:Will not start.
6. Fan coil is iced (in cooling).
Check your specific control troubleshooting section.
Possible Reason/Correction
7. Fan is not running.
1. A/C circuit breaker is off.
Check your specific control troubleshooting section.
Turn circuit breaker on at ship’s panel.
8. Seawater plumbing is air-locked.
2. Control is not turned on.
Ensure that seawater plumbing is installed per the
guidelines in this manual.
See mechanical control section of this manual for
MCP controls, or see the digital control manual for
Elite or Passport I/O controls.
9. Digital control is programmed for Cool or Heat
only, or mechanical control thermostat is
rotated to far towards either Cooler or Warmer
setting.
3. Wrong wiring at terminal strip.
Check wiring diagram and correct if necessary.
4. Push-on butt connectors became
disconnected during installation.
See digital control manual for reprogramming or see
mechanical control operation section in this manual.
Disconnect power supply and open electric box,
check wiring diagram, correct if necessary
10. High pressure switch open (in cooling) due to
improper seawater flow.
5. Input line voltage is insufficient.
Strainer or intake may be plugged, sea cock may be
closed, check seawater hose for kinks or collapses.
Verify pump operation. Check pump circuit breaker if
applicable
Check power source (shore/generator) for proper
voltage. Check wiring and terminals for proper sizes
and connections. Verify with a volt-meter that the
power at the unit is the same as the power source.
11. High pressure switch open (in heating) due to
improper airflow.
Fault: Fan is not running.
Remove any obstructions in return air stream. Clean
return air filter and grille. Check for crushed or
restricted ducting, ducting must be as straight,
smooth and taut as possible.
Check specific control troubleshooting section
Fault: No cooling or heating.
12. High-pressure switch is open in heating mode.
Possible Reason/Correction
System may cycle on high-pressure if seawater
temperature is above 55°F.
1. Temperature set point is satisfied.
13. Compressor's thermal overload is open due to
either of the above reasons.
Lower or raise set point.
2. Obstructed seawater flow.
Compressor needs to cool down. Turn system off for
a while (it may take up to three hours to reset
thermal overload).
Clean seawater strainer. Check for obstructions at
speed scoop thru-hull inlet. Check for a good steady
flow from the overboard discharge.
3. Seawater pump may be air-locked.
Fault: No heating.
Remove hose from pump discharge to purge air from
line.
Possible Reason/Correction
1. Unit is “cool only”, or if reverse cycle, reversing
valve may be stuck.
4. Loss refrigerant gas.
Check a/c unit for refrigerant oil leakage, call service
technician.
Tap reversing valve lightly with rubber mallet while
unit is in heat mode. Call for service if that does not
correct the problem.
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3. Seawater temperature too high for cooling or to
low for heating.
Fault: Low airflow.
Possible Reason/Correction
1. Airflow is blocked.
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
(if reverse cycle option is installed) in water as low
as 40°F.
Remove any obstructions in return air stream. Clean
return air filter and grille. Check for crushed or
restricted ducting, ducting must be as straight,
smooth and taut as possible.
4. Improper air sensor location.
Check your specific control troubleshooting section.
2. Fan Coil is iced.
See below.
Digital Controls Troubleshooting
Fault: Fan coil is iced.
Possible Reason/Correction
Fault: Digital display panel is not lit.
1. Thermostat set point is too low.
Possible Reason/Correction
Raise set point.
1. 8-pin display cable plugs are not making
contact (unplugged, dirty, bent, or broken
pins).
2. Improper airflow.
Remove any obstructions in return air stream. Clean
return air filter and grille. Check for crushed or
restricted ducting, must be as straight, smooth and
taut as possible. See the Digital Controls Trouble-
shooting section below for reprogramming options.
With POWER OFF at the circuit breaker, remove
connector and inspect. If damaged, replace connec-
tor or entire display cable.
3. Supply air is short-cycling.
Fault: Fan is not running or runs
continuously.
Redirect supply air so that is not blowing into the
return air stream. Seal any air leaks on duct.
Possible Reason/Correction
4. Humidity level too high.
1. Digital control is programmed for either fan
cycling with compressor or continuous fan
operation.
Close hatches and doors.
5. When all else fails.
Elite Control: Press and hold the fan button for 5 sec-
onds to change to "con" so fan will stay on continu-
ously or to "cyc" so the fan cycles with the compressor.
Switch a/c to heat until ice melts or use hair dryer to
melt.
Passport I/O Control: Reprogram parameter P-14.
Fault:Water coil is iced in the heating
mode.
Note: After the compressor cycles off, the fan will
continue to run for 2 minutes in cool mode and 4
minutes in heat mode regardless of parameter
setting.
1. Seawater temperature is below 40°F.
Shut down system to prevent damage to condenser.
Allow coil to defrost.
Fault: Fan is not running but the
compressor is.
Fault: System runs continuously.
Possible Reason/Correction
Possible Reason/Correction
1. Set point temperature is improperly set: too low
for cooling or too high for heating.
1. Failed triac on Passport I/O circuit board.
Send for repair or call local service technician (see
back of book for a listing).
Raise or lower set point.
2. Porthole or hatches open.
Close all port holes and hatches.
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Fault: Fan runs continuously although it
is set to cycle with compressor.
Fault: System runs continuously.
Possible Reason/Correction
Possible Reason/Correction
1. Improper air sensor location.
Verify display head location with criteria found in the
control manual. Install alternate air sensor if neces-
sary.
1. Failed triac on Passport I/O circuit board.
Send for repair or call local service technician (see
back of book for a listing).
Fault:“HPF” is displayed.
Fault: No cooling or heating.
Possible Reason/Correction
Possible Reason/Correction
1. High-pressure switch is open (in cooling) due
to improper seawater flow.
1. Digital control programmed for heat or cool
only.
Strainer or intake may be plugged, seacock may be
closed, check seawater hose for kinks or collapses.
Verify pump operation; check pump circuit breaker if
applicable.
Elite Control: Press and release the Mode button
(bottom right corner of display) until the desired
mode LED is lit.
Passport I/O Control: Reprogram parameter P-1.
2. High-pressure switch open (in heating) due to
improper airflow.
2. "HPF" or "LPF" is displayed.
See below.
Remove obstructions in return air stream. Clean air
filter and grille. Check for crushed or restricted
ducting, ducting must be as straight, smooth and
taut as possible.
Fault: No heat.
Possible Reason/Correction
If problem persists, reprogram Low Fan Speed Limit
for maximum value. Set P-2 to 55 for Elite or set P-3
to 64 for Passport I/O. And, set the Reverse Fan
Speeds During Heating Mode parameter to "rEF"
(P-12 for Elite or P-13 for Passport I/O), or manually
set fan speed to high.
1. Digital Control may be set to Electric Heat, not
Reverse Cycle.
Elite Control: Reprogram parameter P-13
Passport I/O Control: Reprogram parameter P-15
Fault:“LPF” is displayed.
Fault: Unit switches to heat while in cool
mode.
Possible Reason/Correction
1. Low-pressure switch is open due to low seawa-
ter and/or low return air temperatures.
Possible Reason/Correction
1. De-icing feature enabled due to coil icing up.
Try restarting the a/c unit, the optional low pressure
switch has a ten minute shutdown time delay that
may be in affect.
Elite Control: Reprogram parameter P-7
Passport I/O Control: Reprogram parameter P-8
2. Low pressure switch is open due to loss of
refrigerant.
Fault: Fan coil is iced.
Possible Reason/Correction
1. Improper airflow.
Check a/c unit for refrigerant oil leakage, call service
technician.
Fault:“ASF” is displayed.
See the General Troubleshooting section above first,
before reprogramming digital control.
Possible Reason/Correction
Reprogram parameter P-7 for Elite or P-8 for Passport
I/O. If de-icing cycle does not melt ice, switch a/c to
heat until ice melts or use hair dryer to melt ice.
1. Indicates failed face plate air sensor, alternate
air sensor or display cable.
Unplug alternate air sensor if installed or plug in
alternate air sensor if not installed. Try another
display cable.
If problem persists, reprogram Low Fan Speed Limit
for maximum value. Set P-2 to 55 for Elite or set P-3
to 64 for Passport I/O.
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2. Damaged jack/socket in display head or on
circuit board.
Visually check to see that pins inside socket are not
bent or corroded. Repair or replace display or circuit
board if needed.
Fault:“PLF” is displayed (Elite Digital
Control only).
Possible Reason/Correction
1. Indicates that seawater flow through the con-
denser coil is insufficient.
Check for adequate seawater flow. Verify pump
operation. Inspect the condenser coil, it may need
cleaning (see maintenance section). Sensor may be
faulty, replaced if necessary. Call for service tech.
MCP Mechanical Control Panel
Troubleshooting
Fault: Fan is not running.
Possible Reason/Correction
1. MCP system switch is not set properly.
Set MCP system switch to “START” for fan only or
“RUN” for cooling and heating (if reverse cycle).
2. MCP fuse blown.
Replace 10 amp fuse behind MCP panel
3. Wire became disconnected or loosened during
installation.
Reconnect or tighten, verify with wring diagram in
this manual.
Fault: System runs continuously.
Possible Reason/Correction
1. Improper MCP air sensor location.
Verify return air sensing bulb location with criteria
found in this manual.
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MAINTENANCE
Reversing Valves
Return Air Filters
Reverse cycle units have a reversing valve; the valve
must be energized periodically to keep the internal parts
moving freely. To do this, switch the a/c unit into heat for
a few seconds once a month.
Check the return air filter about once a month and clean
as necessary. To clean the filter, remove it from the unit,
rinse with water, air dry and reinstall.
Winterization
Seawater Strainer
There are several methods of winterization, some of
which work better than others. The four various methods
employed using a 50/50 nonpolluting biodegradable
antifreeze/water solution are:
Insure that your pump receives adequate seawater flow
by regularly cleaning the strainer basket. Periodically
check the overboard discharge for a steady stream of
water. Check seawater intake speed scoop for obstruc-
tions. Make sure hoses are not looped, kinked or
crushed.
1. Pumping of antifreeze solution into the overboard thru-
hull fitting, and discharging through the intake thru-hull
fitting.
2. Use of the seawater pump to pump antifreeze solution
through the system and discharging through the
overboard thru-hull fitting. Close sea cock, remove
hose from strainer discharge, raise hose above pump
(so pump does not lose its prime) and pour in anti-
freeze solution. Pump solution through system. The
strainer and hose to sea cock will also need to be
drained of water.
Condenser Coil Cleaning
1. With the system turned off at the circuit breaker on the
ship’s panel, disconnect the inlet and outlet connec-
tions of the condenser coil.
2. Use chemical resistant hoses (MAS white PVC 5/8”
I.D., etc.) to connect the inlet of the condenser coil to
the outlet of a chemical resistant, submersible pump
(MAS P-500 pump, etc.) and let the hose connected to
the coil outlet flow freely into the container mentioned
below.
3. Use of pressurized air injected at the overboard
discharge fitting and the water being discharged
through the seawater intake fitting.
3. Place a strainer or piece of screen over the inlet of the
pump and submerse the pump into a container filled
with a 5% solution of muriatic or hydrochloric acid and
fresh water or use a premixed over-the-counter
solution. Use a large container as possible to hold the
solution (5-25 gallons).
4. Use of pressurized air to force water from the intake
through the overboard discharge.
Any method that causes the antifreeze solution to flow
downward is the method of choice. By this means, the
antifreeze solution will displace any water trapped and
eliminate the possibility of freezing in hidden areas. In
addition, since the seawater pump utilizes a magnetically
driven impeller, the impeller should be removed from the
wet end assembly, wiped with an alcohol solution, and
stored in a warm, dry area until commissioning takes
place.
CAUTION: Avoid spilling or splashing the solution.
Follow all warnings and recommendations given by the
manufacturer of any acids or premixed solutions.
4. Power the pump and circulate the solution through the
condenser coil for 15-45 minutes depending upon the
size of the coils and the extent of the contamination.
Visual inspection of the solution in the container
should indicate when the contamination removal has
stopped.
Note: Collect all discharged liquids and re-
cycle or dispose of in a proper manner.
5. Circulate fresh water through the coil to flush any
residual acid from the system.
6. Restart the system and check operational parameters
to ensure thorough cleaning has taken place. Addi-
tional cleaning may be necessary with extreme
contamination.
WARNING: For the purpose of protecting the environ-
ment, dispose of any contaminated acid solutions in
accordance with federal, state and/or local regulations.
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MANUFACTURERS LIMITED WARRANTY AGREEMENT
The following warranty is extended to cover marine air
conditioners manufactured or supplied by Dometic
Environmental Corporation, and is subject to qualifica-
tions indicated. Dometic warrants for the periods set forth
below that products manufactured or supplied by it will be
free from defects in workmanship and material, provided
such products are installed, operated, and maintained in
accordance with Dometic’s written instruction.
ances for removal and reinstallation of such components
for a period of one (1) year from the date of installation,
but not to exceed two (2) years from the date of manu-
facture at the Dometic factory. OEM installed equipment
warranties begin with the purchase of the vessel, not
from the date of installation. Warranty will be paid in
accordance with our established schedule of allowances.
Compensation for warranty repairs is only made to
Dometic authorized service companies.
ALL IMPLIED WARRANTIES INCLUDING MERCHANT-
ABILITY AND FITNESS FOR A PARTICULAR PURPOSE,
ARE LIMITED TO THE TERMS AND PERIODS OF
WARRANTY SET FORTH BELOW AND, TO THE EX-
TENT PERMITTED BY LAW, ANY AND ALL IMPLIED
WARRANTIES ARE EXCLUDED.
Dometic will repair, or replace at its option, components
found to be defective due to faulty materials or workman-
ship, when such components, examined by an authorized
service dealer or a factory service representative, are
found to have a defect for which the company is respon-
sible. Refer to Manufacturer’s Limited Warranty Policy
for complete coverage and exclusions. Replacement
components are warranted for the duration of the remain-
ing warranty period in effect on the original component.
In the event that a unit has to be returned to the factory,
it must be properly packaged to prevent shipping dam-
ages. If packaging is not available, Dometic will provide it
at no charge. The warranty may be voided on any piece
of equipment or component that is damaged due to
improper packaging.
Warranty with the Elite or Passport I/O digital con-
trols (Coverage applies to units manufactured on or after
03/01/03 and applies only to units equipped with Elite or
Passport I/O digital controls at the Dometic factory.):
Components comprising of the Passport I/O circuit
boards, Elite or Passport I/O digital displays, and associ-
ated cables are warranted for a period of three (3) years
from the date of installation, but not to exceed four (4)
years from the date of manufacture at the Dometic
factory. All other components comprising a complete
system (excluding pumps and pump relay panels) on a
new installation are warranted for a period of two (2)
years from the date of installation, but not to exceed
three (3) years from the date of manufacture at the
Dometic factory. Pumps and pump relay panels are
warranted for a period of one (1) year from the date of
installation, but not to exceed two (2) years from the date
of purchase. OEM installed equipment warranties begin
with the purchase of the vessel, not from the date of
installation.
This limited warranty is extended in lieu of all other
warranties, agreements or obligations, expressed or
implied, concerning Dometic’s components. This warranty
is extended only to the original purchaser and is not
transferable. This warranty shall be governed by the laws
of the State of Florida and gives the original first end
user definite legal rights.
This warranty does not cover damages incidental and/or
consequential to the failure of Dometic’s equipment
including but not limited to; normal wear, accident,
misuse, abuse, negligence, improper installation, lack of
reasonable and necessary maintenance, alteration, civil
disturbance or acts of God.
Warranty with MCP (Mechanical Control Panel) control:
Components comprising a complete system on a new
installation are warranted for a period of one (1) year from
the date of installation, but not to exceed two (2) years from
the date of manufacture at the Dometic factory. OEM
installed equipment warranties begin with the purchase of
the vessel, not from the date of installation.
No person or dealer is authorized to extend any other
warranties or to assume any other liabilities on Dometic’s
behalf, unless made or assumed in writing by an officer
of Dometic.
In addition, Dometic will pay labor costs and travel as
outlined in its Schedule of Limited Warranty Allow-
16
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DESCRIPTION OF FIGURES
Fig 1. Overview of Vector Compact
Fig 2. Placement of Vector Compact
Fig 3. Spacing Allowances & Unit Dimensions
Fig 4. Installation of Condensate Drain
Fig 5. Mounting Brackets
Fig 6. 3-Knob Control
Fig 7. Seawater Pump and Plumbing Configuration
Fig 8. Ducting and Grille Sizing
Fig 9. Wiring Diagrams for Mechanical Controls (VCM5-16 & 24K)
Fig 10. Wiring Diagrams for Mechanical Controls (VCM5-16HV & 24K 230V/3Ph)
Fig 11. Wiring Diagrams for Digital Controls (VCD5-16 & VCD/VHD 24K)
Fig 12. Wiring Diagrams for Digital Controls (VCD5-16HV & VCD/VHD 24K 460V/3Ph)
Fig 13. Wiring Diagrams for Digital Controls (VCD18K-HV & VCM18K-HV)
17
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Fig 1. Overview of Vector Compact
Fig 2. Placement of Vector Compact
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Fig 3. Spacing Allowances & Unit Dimensions
PROPRIETARY NOTE: THE INFORMATION CONTAINED
WITHIN THIS DOCUMENT IS THE PROPERTY OF DOMETIC
CORPORATION. ANY ATTEMPT TO COPY OR DISTRIBUTE
WITHOUT WRITTEN CONSENT FROM DOMETIC
CORPORATION SHALL BE CONSIDERED UNLAWFUL AND
CAN BE CONTESTED IN A COURT OF LAW.
REV
A
B
C
D
DATE
3/7/03
REVISION DESCRIPTION
REVISED TABLE DIMS,CAD200-03
DWG APR
DRR RAP
DKM RAP
DRR RAP
DRR RAP
3/28/03 REVISED DIMS & MODEL NUMBERS,CAD251-03
5/24/04 ADDED VCD/M18K/1-HV TO TABLE,CAD345-04
7/15/05 ADDED 5KHV DIMS,REVISED TO /2 FROM /1,CAD428-05
Dometic Environmental Corporation - Marine Air
VCD/M5-24K (HV), VECTOR COMPACT PSPRT I/O
& MECH SPACING ALLOWANCES AND DIMENSIONS
DATE: 1/21/03 DWG BY: DRR
PARTNN/UAMBER:
M1020049
D
SCALE:
1:10
APR BY: RAP
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Fig 4. Installation of condensate drain
Fig 6. 3-Knob Control
Fig 5. Mounting brackets
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Fig 7. Seawater pump and plumbing configuration
Fig 8. Ducting and Grille Sizing
Model
5K
7K
10K
12K
16K
18K
24K
Duct Diameter (in/mm)
Duct Area (sq in/cm)
R/A Grille (sq in/cm)
S/A Grille (sq in/cm)
4/102
5/127
6/152
6/152
7/178
7/178
8/203
12.6/81 19.6/126 28.3/183 28.3/183 38.5/248 38.5/248 50.3/325
64/413 80/516 100/645 130/839 160/1032 200/1290 240/1548
32/206 45/290
60/387
70/452
80/516
100/645 140/903
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Fig 9. Wiring Diagrams for Mechanical Controls (VCM5-16 & 24K)
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Fig 10. Wiring Diagrams for Mechanical Controls (VCM5-16HV & 24K 230V/3Ph)
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Fig 11. Wiring Diagrams for Digital Controls (VCD5-16 & VCD/VHD 24K)
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Fig 12. Wiring Diagrams for Digital Controls (VCD5-16HV & VCD/VHD 24K 460V/3Ph)
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Fig 13. Wiring Diagrams for Digital Controls (VCD18K-HV & VCM18K-HV)
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Dometic Environmental Corporation
2000 N. Andrews Ave. Ext. • Pompano Beach, FL 33069-1497 USA • Phone: 954-973-2477 • Facsimile: 954-979-4414
For Sales and Service Calls within Europe and the Middle East, please contact +44 (0) 870 330 6101
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