Specifications

7
❖
English
L-2254 Installation
the box. To calculate the square inch area of a round duct,
multiply the radius by itself (r
2
) and multiply that number by
3.1416(π). See Figure 8.
The following is a summary of proper ducting connections:
1. Pullbacktheberglass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 pre
-
vent any air leaks.
5. Pull the insulation back up over the mylar to the ring and
tape this joint.
6. Remove excess ducting and use the same connection
method at the supply air grille.
All ducting should:
•Beappropriatelysizedforeachapplication.
•Runassmoothlyandtautaspossible.
•Haveasfewbendsorloopsaspossible.
•Besecurelyfastenedtopreventsaggingduringboat
operation.
•Haveallexcessductinglengthstrimmedoff.
•Notbeattenedorkinked.
•Insulatedwhenlocatedinhighheatloadareas(hull
side, mechanical compartments, etc.).
•Beproperlyprotectedagainstpotentialdamagewhen
routed through open areas.
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 regard
-
less of which tack the vessel is on. Pump may be mount-
ed horizontally or vertically, however the discharge must
always be above the inlet. Pump head should be rotated
toward the direction of water ow. Install the seawater
speed scoop intake as far below the water 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 man
-
datory 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 installed 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tting
which should be located where it can be visually checked
for water ow 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
threaded seal tape on all threaded connections. The follow
-
ing is a summary of the seawater system installation:
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 designed
for underwater use.
2. Install a bronze, full ow seacock on the speed scoop
thru-hull inlet.
3. Install a seawater strainer below the level of the pump
withaccesstolter.
4. Mount the pump above the strainer and at least one foot
below the waterline.
5. Connect the seacock and strainer with an uphill run of
reinforced marine grade hose.
6. Connect the discharge from the pump uphill to the bot
-
tom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ttingwith5/8”hose.
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).
8. Double clamp all hose connections with stainless steel
clamps, reversing the clamps.
9. Use threaded seal 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.
Electrical Connections, Grounding
and Bonding
All a/c units have a terminal strip mounted inside the
electric box. The terminal strip is labeled for proper con
-
nections 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.