Webasto FCF 10 Installation And Operation Manual - page 12
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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 or chafing during vessel operation.
◆
Have all excess ducting lengths trimmed off.
◆
Not be flattened 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 or bulkheads.
4.10 Seawater Pump and Plumbing
Several guidelines should be followed during the installation 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 1’ (305mm) below the water line
regardless of which tack the vessel is on. Pump must always be mounted per manufacturers recommendations,
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 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.
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
installed with an upward incline from the speed scoop & seacock, through the strainer, to the inlet of the pump, next
to the inlet of the A/C unit's condenser coil. The discharge from the A/C unit should run to the seawater outlet
thru-hull fitting that should be located where it can be visually inspected for water flow as close to the waterline to
reduce noise. All hose connections shall be secured using double/reversed stainless steel hose clamps. Use Teflon tape
on all threaded connections.
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 flow seacock on the speed scoop thru-hull inlet.
3
）
Install a seawater strainer below the level of the pump with access to filter.
4
）
Mount the pump above the strainer and at least 1’ (305mm) 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 bottom inlet of the A/C unit's condenser coil with
reinforced marine grade hose. Connect the discharge from the condenser coil to the overboard discharge
thru-hull fitting with 3/4" hose.
7
）
Avoid loops, high spots or the use of 90° elbows with seawater hose (each 90° elbow is equivalent to 2.5'
(762mm) of hose and a 90° elbow on the pump outlet is equivalent to 20' (6.1m) of hose).
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.
Seawater Flow:
Model
6K
10K
12K
16K
20K
25K
Min. Seawater Flow 1.1gal/min
(4.0L/min)
1.6gal/min
(6.0L/min)
2.8gal/min
(10.5L/min)
2.9gal/min
(11.0L/min)
5.3gal/min
(20 L/min)
6.3gal/min
(24.0L/min)
Max. Seawater Flow
2.6gal/min
(10.0L/min)
4.0gal/min
(15.0L/min)
5.3gal/min
(20.0L/min)
6.6gal/min
(25.0L/min)
8.5gal/min
(32 L/min)
9.8gal/min
(37.0L/min)
Rated Seawater Flow
1.6gal/min
(6.0L/min)
2.4gal/min
(9.0L/min)
3.7gal/min
(14.0L/min)
4.2gal/min
(16.0L/min)
6.1gal/min
(23 L/min)
7.4gal/min
(28.0L/min)