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Super Yachts are complicated. A sudden crew change or the loss of a captain or engineer can result in hundreds of lost hours and improper use of equipment. A Seaportal manual is a clear, plain-English manual on the operation and use of the yacht and her equipment.  This manual provides concise and comprehensive information on how to operate, maintain, service, and troubleshoot each piece of equipment on your vessel. This book is continuously updated by Seaportal from information provided by the captain, engineer, and crew of the yacht to reflect the idiosyncrasies of the vessel and her equipment and provide a history of faults and repairs.

A Seaportal Manual covers the construction of the vessel if applicable, and contains complete specifications of the yacht. Contact details for techs, insurance agents, managers, owners, flag agent, Medical responders, and crew are included in manual. Machinery such as air conditioning systems, generators, bow thrusters, hydraulic packs, electronics, computer systems, water makers, stabilizers, main engine, hot water heaters, electrical systems, batteries, and all other equipment on board are detailed. It also covers the yacht's maintenance, care of deck, rig, and sails. It details the waxes and polishes used on board, plus care of interior wood and upholstery. In short, a Seaportal Yacht Manual is a complete operation manual for the yacht, referred to on a daily basis by captain, engineer, and crew, and critical when confronted with the sudden absence of a key crew member.

Below is a sample of the WATERMAKER section from a Seaportal developed manual.




General Information

Manufacturer Hydro Electric Marine
  150 Rue de Goa
  06600 Antibes, France
  Phone  +33 493 742929
  Fax       +33 493 748062


Starting Water Maker

1. Make sure that one of the two thru-hull valves supplying the saltwater manifold is open (for location, see schematic).

2. Open one or both of the valves under the galley sink corresponding to the tank which is to be filled.

3. Make sure High Pressure Valve (black valve located on face of main unit, bottom left side) is turned fully counter-clockwise to full open.

4. Make sure the two thermal breakers for HP/LP are pushed in.

5. Press Green Start button located on face of main unit and HOLD for approximately 3 seconds.

6. Feed Pressure should reach normal of 10-25 psi.

7. Flowmeter should hang in stream between 13 to 16 liters per minute

8. Digital readout will show all 9s.

9. After system has run for approximately 1 minute, slowly turn High Pressure Valve clockwise, observing Product gauge until float is about ¾ up. Bubbles will appear in Product gauge and digital readout should start descending. Operating Pressure Gauge should be around 600 - 700 psi 

10. After another minute slowly turn High Pressure Valve clockwise until Product gauge float is at top – 4.0 LPM (liters per minute). Operating Pressure Gauge should never exceed 850 psi.

11. Red light should shift to yellow when digital read out is around 1500, and then to green, indicating that the water quality is good and water tanks are being filled.

12. Fresh water is now being made.


Shutting Down Water Maker


1. Turn High Pressure Valve fully counter-clockwise. Operating Pressure Gauge should read 0 psi.

2. Let watermaker run for approximately 1 minute.

3. Push Red Stop button.

System Reset

Occasionally, the LED display on the front of the Water Maker will show an error message, and the system will not start. Pushing the UP button on the display will reload a copy of the factory EEPROM, however, the A1 parameters must be manually reset. To do so, press and hold the parameter button (the one with the partial oval with an arrow on one end) for more than 2 seconds. This will put you into the configuration menu. Keep punching the parameter button until the A1 parameter appears showing OFF. Press the up button until the display shows “ON L”.. Press the parameter button to accept, and go to next page. The next parameter is Setpoint output A1. The factory setting is zero – this needs to be changed to 1500. Press and hold UP button until it reads 1500. The Water Maker should be ready to go.



The membranes have a semi-permeable surface where bacteria, minerals, and other impurities can collect. It is important to take proper care of the membranes to prevent them from fouling.


Freshwater Flushing

When operating, the HEM watermaker provides a constant flow of saltwater, which removes much of the impurities from the membranes. However, during periods of shut down algae in the saltwater can attach to the membranes and cause fouling. A periodic freshwater flush of the system will kill the algae and help keep membranes in top working order. The HEM 25 on Varsovie has a semi-automatic freshwater flush function. To operate, press the yellow button on the face of the main unit and let run for several minutes. This will take water from the yacht’s water tanks, run it through a charcoal filter to remove any chlorine present in the water, and then pass the membranes.


Chemical Flushing

If the HEM watermaker is going to be laid up for more than a month, a chemical flushing is required. The chemical flush cleans and sanitizes the membranes while preventing algae or bacterial growth. On Varsovie, there is a 50 liter cleaning tank that must be attached to plumbing via included hoses. Currently, the attachment points and tank are not present. We are awaiting this part of the system’s installation.


Sand Filter Flushing

The sand filter should be flushed (backwashed) regularly to remove dirt and debris. Flush for 15 minutes and then rinse for 3 minutes. It is important to rinse because the dirt that has accumulated in the flushing cycle needs to be evacuated rather than sent to the membranes.

To flush the sand filter, the High Pressure Pump Must be Turned Off. The High Pressure can be turned off simply by flicking the breaker on the front of the water maker. Then, turn the 3 valves as indicated on the drawing below. Press the start button and wait 15 minutes for the filter to flush. After 15 minutes, turn the unit off, switch valves #1 and #2 back to their normal position, and run the water maker for an additional 3 minutes.




System Information

The HEM 25/1400 modular unit is installed in V3. This watermaker can produce 1,400 gallons of fresh water per day, or 58.3 gallons per hour (5,000 liters per day or 208 liters per hour). With the watermaker operating at capacity, it can fill both water tanks in about 7.5 hours.


A description of how the system works on V3 follows:
The HEM 25 gets salt water from either of the two thru-hulls and water strainers located just aft of the main hydraulic unit in the engine room. The water strainers are the initial filters for the system, removing weeds, crabs, and other debris. Between the strainers is the saltwater manifold. The water maker valve is the starboard-most valve on the manifold. From the manifold, saltwater is driven by a low pressure pump through a sand filter and then through a 25 micro filter before entering a 5 micro filter. From the prefilters, the water enters the high pressure pump, which then forces the filtered water through the membranes.

Water from the membranes is then divided into two streams: the permeate, which is water that has passed through the membrane; and the concentrate, which is water that does not pass through the membranes and now contains a higher level of salt.

For salt water, about 25-30% of the water is recovered as permeate, with the balance being rejected as concentrate. The permeate is collected from the membrane into a manifold. From here, the flow is directed through the product relief valve. The relief will release any pressure should the water tanks be closed. After passing through the product relief valve, the water passes through the product flow meter. The product flow meter is a transparent gauge on the front of the system panel (in the engine room) and gives the flow rate in liters per minute.

After passing through the product flow meter, the water quality is checked by a conductivity sensor which checks for salinity. This sensor gives instructions to the central control system to either accept or reject the water. If water is acceptable, a solenoid valve will open allowing the water to flow to the final stage of filtration before entering Varsovie’s water tanks. If the salinity controller rejects the water, the water is directed overboard.

In the final stage, the product water passes through the two post filters which are located in the engine room, under the floor board, directly outboard of the main unit. The first filter is a charcoal filter which removes any trace odor or taste which may be present in the water. The second filter is a limestone filter which corrects the pH-value by lowering the acidity of the water. Finally, the water is directed to the fresh water manifold, located under the floor board directly aft of the mast. From there the water is directed to either tank #1, tank #2, or both water tanks.



Filter Information



From the saltwater manifold the seawater goes directly into the Sand Filter, located in the engine room, starboard side. The sand filter is the first defense against pollutants in the seawater and eliminates any debris. The use of the sand filter greatly reduces the frequency of the cartridge filter replacement. The sand filter is virtually maintenance-free, and requires only periodic back-flushing to clean.


Seawater contains quantities of suspended matter which would foul the membrane if not removed. After the seawater leaves the sand filter, it next passes through two cartridge filters. The first cartridge is a 25 micron filter, the second a 5 micron filter. Both filters have a disposable element.

A pressure gauge is installed after the filters. When the filters are new and clean, the water flow from the low pressure pump will pass through the filters with only a slight drop in pressure. As the filters become dirty, the pressure will drop. At 3-5 psi, the system will automatically shut down and a red warning light will remain on.


Fresh water from the water maker flows through a set of post treatment filters. The first filter is a charcoal filter which removes any trace of odor or taste which may be present in the newly-made water. The charcoal must be periodically replaced.

The second filter is a limestone filter which balances the pH value of the water by lowering the acidity of the permeate. The limestone needs to be replaced periodically.




The low pressure pump pulls saltwater from the saltwater manifold and delivers it through the various filters and to the high pressure pump. The low pressure pump can be used to flush the system with fresh water or chemicals, and to clean the sand filter.




The high pressure pump takes in the cleaned saltwater and sends it through the membranes. The high pressure pump maintains a constant flow of water as pressure is increased within the system.







Active Carbon 0401203 1 liter
.05 micron prefilter 0327359 10
.25 micron prefilter 0327360 10
Limestone 0452501 1 kg
Alkaline Cleaner 0329001 250 ml
Acid Cleaner 0329004 100 ml
Ultracil 10 0402701 1 kg
Sodium Metabisulfate 0402701 1 kg
Hp Pump Oil 0404401 2 liters
Capacitor 420V, 65µF         


Capacitor 420V, 55µF          3
Solenoid Valve LF121             0709703 1
Hammer for L121F                0329641 1
Transformer 80VA                 0425301 1
Control Relay 220V               0331060 1
Salinity Probe LF2613            0331071   1
Pulsation Dampener 0.16 Lt      0328350  1