Seakeeper 18 Installation Manual (90672-2); S/N 18-234-2475 to Current
4.2 Installation Considerations
- The installer is responsible for supplying a dedicated positive-displacement seawater pump (or electric isolation valve and centrifugal pump) and associated plumbing. Seawater connections on the Seakeeper heat exchanger mate with ¾ in. (19 mm) hose. Seakeeper DC Seawater Pump, 24 VDC (P/N 30322), is an option from Seakeeper.
- Unintended seawater flow from the seawater pick-up during the vessel’s underway operation is unacceptable and may cause stress to internal components. Unintended flow should be mitigated through pump selection, using a diaphragm-style pump or an inlet control valve. Continuous cooling flow from shared through-hull plumbing, a centralized chiller, or a cooling system is unacceptable for on-demand Seakeeper models.
- Disconnecting the hose from the glycol pump is not necessary except to replace the pump. In this case, provision will need to be made to catch the glycol draining as the plumbing is disconnected. Use caution to avoid breaking plastic hose connections on the pump casing.
- The wire harness ‘Seawater Pump Out’ provides output to power and automatically control the seawater pump. This pump must operate on 24 VDC single phase and consume less than 10 A. Pumps requiring other voltages or higher current can still be controlled by using this supply from the motor drive to trigger an installer-supplied contactor, but a separate source of power must be provided.
- Maximum sea water pressure in heat exchanger is 20 psi (1.4 bar).
- Under all boat operating conditions, the minimum seawater flow requirement through the heat exchanger is 4 GPM (15.1 LPM), and the maximum is 8 GPM (30.3 LPM). When sizing the seawater pump, the installer should factor in losses for raw water plumbing. In addition to the initial operation at the dock, new installations should be checked to be within the flow requirements while the vessel is at speed. Flows above 8 GPM (30.3 LPM) could affect heat exchanger life.