MABRU POWER SYSTEMS SC4.2, Installation Manual

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Several guidelines should be followed during the installation of
the seawater system..
If 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
tank the vessel is on. Pump may be mounted horizontally or vertically.
The following is a summary of the Seawater System installation:
- Install the seawater 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 uses.
- Install a bronze, full fl ow seacock on the seawater scoop thru-hull inlet.
- Install a seawater strainer below the level of the pump with access to fi lter.
- Mount the pump above the strainer and at least one foot below the
waterline.
- Connect the seacock and the strainer with an uphill to run of reinforced
marine garde hose.
- Connect the discharge from the pump uphill to the bottom inlet of the A/C
unit’s condenser coil with 5/8” (15.9mm) reinforced marine garde hose.
- Connect the discharge from the condenser coil with overboard discharge
thru-hull fi tting with 5/8” (15.9mm) reinforced marine grade hose.
- Avoid loops, high spots or the use of 90° elbows with seawater hose (each
90° elbow is equivalent to 2.5’ (0.762m) of hose and a 90° elbow on the
pump outlet is equivalent to 20’ (61m) of hose).
- Double clamp all hose connections with two stainless steel clamps, reversing
the clamps.
- Use threaded seal tape on all threaded connections.
- 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.