Flow Chart & Parts Diagram Reference Guide #
Overview #
The Spot Zero XTCII Watermaker System is a high-performance marine water purification system designed to provide high-quality freshwater production onboard.
This knowledge base article provides a reference point for the XTCII system flow diagram, component identification, and parts reference documentation. The attached manufacturer diagrams should be used to identify system components, understand water flow direction, and assist with troubleshooting and preventative maintenance.
XTCII System Purpose #
The XTCII system uses a combination of:
- Seawater intake and filtration.
- Booster pump supply.
- High-pressure reverse osmosis membrane system.
- Freshwater flush system.
- Product water monitoring.
- TDS (Total Dissolved Solids) monitoring.
- Automated valves and controls.
The system is designed to provide reliable freshwater production while protecting onboard plumbing and equipment from mineral contamination.
System Flow Overview #
The general water flow path is:
1. Seawater Intake #
Seawater enters the system through:
- Dedicated sea chest / seacock.
- Intake strainer.
- Booster pump supply.
The intake system must remain free of debris and marine growth to maintain proper flow.
2. Pre-Filtration #
Incoming seawater passes through filtration components designed to protect downstream equipment.
Typical components include:
- Sediment filtration.
- Freshwater flush filtration assembly.
- Filter housings and sealing components.
Clean filtration is essential for protecting the high-pressure pump and membranes.
3. High-Pressure Pump & Membrane Assembly #
Filtered seawater is supplied to the high-pressure reverse osmosis system.
Main components include:
- High-pressure pump.
- Pressure transducers.
- Reverse osmosis membrane vessels.
- Flow monitoring components.
The membrane separates purified product water from concentrated seawater discharge.
4. Product Water Monitoring #
The system monitors:
- Product flow.
- Water quality through TDS measurement.
- System pressures.
- Operating status.
The control system uses this information to manage operation and protect system components.
Primary XTCII Components Reference #
The attached diagrams identify common XTCII components including:
- Booster pump.
- High-pressure pump.
- Membrane vessels.
- Freshwater flush assembly.
- Pre-filter assembly.
- Touchscreen display.
- Pressure sensors.
- Flow sensors.
- Automated valves.
Common Service Components #
Common replacement and maintenance components may include:
- Sediment filters.
- Carbon block filters.
- Membrane elements.
- O-rings and sealing kits.
- Touchscreen displays.
- Filter housing components.
- Freshwater flush components.
Troubleshooting Reference #
When diagnosing XTCII operation issues, verify:
Low Production or Reduced Flow #
Inspect:
- Sea strainer condition.
- Intake flow.
- Pre-filters.
- Pump operation.
- Membrane condition.
Poor Water Quality / High TDS #
Check:
- Membrane condition.
- Proper system pressure.
- Product diversion operation.
- TDS sensor operation.
System Will Not Start #
Verify:
- Electrical supply.
- Control display operation.
- Safety shutdown conditions.
- Pump and valve status.
- Sensor feedback.
Preventative Maintenance #
Recommended maintenance includes:
- Regular inspection of intake strainers.
- Filter replacement according to manufacturer recommendations.
- Inspection of fittings and hoses.
- Monitoring production rate and water quality.
- Maintaining accurate service records.
Always follow the official Spot Zero maintenance intervals and procedures for the installed XTCII model.
Reference Documents #
The attached Spot Zero XTCII documentation includes:
- System flow drawings.
- Wiring references.
- Component identification.
- Configuration workbook.
- Parts diagrams.
These documents should be retained as part of the vessel’s technical reference library.
This guide is intended as a supplemental Ocean Alexander Knowledge Base reference and does not replace the official Spot Zero installation, operation, or service manuals.
East Coast Yacht Group
2955 West State Road 84
Fort Lauderdale, FL 33312
Service Department
954.530.2033
Contact our Service Department today to learn how we can help ensure safe and peak performance for your vessel.
