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Overboard Discharge
The overboard fitting should be located 1 to 2 inches (25-50
mm) above the vessel's water line. This is to facilitate visual
confirmation of water flow, but close enough to the water to
minimize splashing noise. If the overboard discharge fitting
must be installed below the heeled water line, then a
seacock must be installed per ABYC standards.
Seawater Piping
• Use only reinforced marine grade hose or other suitable
piping (PVC, CPVC, cupronickel, or stainless steel).
• Double clamp all hose connections, reversing clamps.
• Use only plastic, bronze, or stainless steel fittings (do not
use brass).
• Avoid loops or dips in the hose runs.
• Make sure enough hose is used to allow future removal of
components.
• Use the correct size hose, fittings, and components.
See the table below for proper sizing. Note that the pump
inlet piping (including through-hull and strainer) may need
to be larger than the outlet pipe size. Do not use pump
connections to determine hose size.
• Use larger hose when the run is longer than 16 feet (5m).
• Required seawater flow rate is 4 gpm per ton (12,000 Btu/
hr) of condensing unit capacity.
Bonding
All metallic parts in contact with seawater must be connected
to the vessel's bonding system. This includes the through-
hulls, strainer, bronze pumps, manifolds, and the condensing
unit(s).
L-0952 Installation
Installing The Cooling/Heating Unit
Safety Warning
A Cruisair cooling/heating unit should never be placed
such that it can circulate carbon monoxide, fuel vapors
or other noxious fumes into the boat's living spaces.
Failure to follow this precaution could result in serious
injury or death.
Ignition Protection Warning
Cooling/heating units do 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.
Safety Warning
Do not terminate air handler condensate drain lines
within 3 feet (1m) of any outlet of engine exhaust
systems, nor in a compartment housing an engine or
generator, nor in a bilge, unless the drain is properly
connected to a sealed condensate or shower sump
pump. Exhaust and/or bilge fumes can travel up a drain
line and mix with the return air blowing into living areas.
Selecting the Site
Typically the unit is located in the cabin under a bunk or in a
locker. The discharge air must be ducted from the cooling
unit to a grill as high as possible (minimum three feet [1m]
above the floor) and away from the return air grill for good air
circulation.
It is not necessary that the coil be placed directly behind the
return air grill, but an unobstructed path must be provided for
the air to get to the coil. A 2" (50mm) space in front of the coil
must be maintained if it is not directly behind the return air
grill.
Site Location Checklist
• Unit is not located in an engine room or near an internal
combustion engine.
• There is no obstruction of airflow from return air grill to
coil.
• Accessible for service and maintenance, including the
return air filter.
• Adequate space for condensate drain connections.
• Flat, horizontal and sturdy mounting location.
• Condensate drain can be run continuously downhill from
unit to overboard fitting or sump.
• Space is sealed from the bilge, engine room, exhaust
fumes or outside air.
• Maximum copper tubing run between condensing unit and
cooling unit is 50 ft. (15m)
9
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