4.3 Connecting Seawater to Heat Exchanger

Refer to Figure 2 for typical seawater plumbing arrangement.

1. Connect seawater pump to Seakeeper dedicated through-hull fitting. A strainer and seacock valve should generally be installed between the seawater inlet and the pump.
2. Connect seawater from the installer-supplied seawater pump to the lower ½ in. (13 mm) hose barb on the heat exchanger.
   
   1. Use the same practices as other below waterline seawater plumbing.
3. Connect the seawater discharge (upper hose barb) to the overboard drain. Use the same practices as for other below-waterline seawater plumbing.
4. During commissioning, seawater flow should be checked to be within the flow requirements while the vessel is at rest, at speed, and when backing down.
   
   1. If no other method of confirming flow is available, the discharge line may be temporarily diverted to a bucket. The flow rate is calculated based on the time required to fill a known volume in GPM or LPM.
   2. Flowrates over 4 GPM (15.2 LPM) could affect heat exchanger life.
5. After sea trial / commissioning, inspect all raw water plumbing for any signs of leakage.

---

Seakeeper Optional DC Seawater Pump (P/N 30331)

Voltage:	24 VDC (Operate at 12 V for Seakeeper 1)
Rated Flow:	2.5 GPM (9.5 LPM), at 12 VDC
Overcurrent Protection:	15 A
Ignition Protection:	ISO 8846 or equivalent

1. Seakeeper offers a self-priming DC Seawater pump as an optional addition, P/N 30331– DC Seawater Pump Assembly, shown in figure below.
2. The Seakeeper Seawater Pump is a 24 VDC pump operated at 12 VDC for the Seakeeper 1 and maintains a seawater flow of approx. 2.5 GPM (9.5 LPM) at 12V DC.
3. The pump assembly is pre-wired for connection to Seakeeper 1 Seawater Pump Output Cable and includes a seawater strainer and various fittings. The pump specifications are as follows: