Mars Air Systems L-2254 - Manual (Page 6)

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English L-2254 Installation
Minimum Tools Required
• Screws drivers
• Pliers
• Pipe wrenches
• Wire cutters/crimpers
• Drill and assorted bits
• Jig saw
• Duct tape
• Electrical tape
• 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.
For installation of the condensate drain:
1. Remove the aft facing watertight plug from the base
pan of the a/c unit (see note).
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.
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
utilized. This will help to prevent water from standing in
the pan. See item 7 for instructions on connecting two
drain lines.
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.
Blower Assembly
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.
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.
Supply & Return Air Grilles
and Transition Boxes
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.
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