Installing Seawater Pump and Plumbing EnviroComfort Installation Manual
14 L-2657 ENGLISH
INSTALLING SEAWATER PUMP AND PLUMBING
Refer to Figure 1: Kit Installation Diagram, page 5 for an overview of the pump and plumbing installation, and refer to Figure 8:
Seawater Pump & Plumbing Diagrams, page 15 for proper and improper installation techniques.
CIRCULATION PUMP
Mounting Requirements
Since the circulation pump is centrifugal and not self-priming, it must be mounted so it is always at least one foot (305mm)
below the water line regardless of which tack the vessel is on.
The pump may be mounted horizontally or vertically, however the discharge must always be above the inlet. The pump head
should be rotated toward the direction of water flow. See Figure 8: Seawater Pump & Plumbing Diagrams, page 15.
SEAWATER SPEED SCOOP
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 submerged so air does not get into the system when the boat heels over.
The speed scoop intake must face forward and not be shared with any other pump. See Table 1: Kit Installation Diagram, page
5.
SEAWATER STRAINER
A seawater strainer is mandatory between the shut off valve (seacock) and the pump to protect the pump from any foreign
matter.
PROCEDURE
Install the seawater system with an upward incline from the speed scoop and seacock, through the strainer, to the inlet of the
pump and then up to the inlet of the air conditioning unit’s condenser coil.
The discharge from the air conditioning unit should run to the seawater outlet thru-hull fitting, which should be located where it
can be visually checked for water flow and as close as practicable to the waterline to reduce noise.
Secure all hose connections with two stainless-steel hose clamps per fitting as close together as possible by putting the screws
of the two clamps on opposite sides. Use teflon tape on all threaded connections.
For an installation overview, refer to Figure 1: Kit Installation Diagram, page 5. For more plumbing details, see Figure 8:
Seawater Pump & Plumbing Diagrams, page 15.
Follow these steps to install the seawater system:
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 one foot (305mm) below the waterline. (See Figure 8: Seawater Pump
& Plumbing Diagrams, page 15 for correct pump-head orientation positions.)
5. Connect the seacock and strainer with an uphill run of 5/8" (16mm) reinforced marine-grade hose.
6. Connect the discharge from the pump uphill to the bottom inlet of the air conditioning unit’s condenser coil with 5/8"
(16mm) reinforced marine-grade hose.
7. Connect the discharge from the condenser coil to the overboard discharge thru-hull fitting with 5/8" (16mm) reinforced
marine-grade hose.
NOTE
In rare situations and under certain variable conditions of direction and speed, a boat moving very fast could trigger
the pump to shut down due to the extra water flow coming through the speed scoop. Normal pump function will
resume when the boat slows or stops. Or, if the condition was sustained, the pump might lock out and require a reset
by turning the pump’s power off then on again.
NOTE
Failure to install a seawater strainer will void the pump warranty and possibly damage the system.
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