1. Overview
The TS301 alarm occurs when the seawater temperature drops below 5°C.
During ballasting, if the seawater temperature is below 20°C, the HEU (Heat Exchanger Unit) is used to increase the temperature for optimal electrolysis efficiency.
HEU is mainly located on the upper floor of the floor deck of the Engine room.
2. Heat Exchanger Unit (HEU) Types
Different types of HEUs may be used depending on the vessel’s system:
- Shell & Tube Type: Uses ship steam as a heat source.
- Plate Type: Applied in vessels with freshwater cooling systems.
- Electric Type: Uses electricity as a heat source.
3. Steps to Enable HEU Operation
By default, seawater bypasses the HEU.
To increase seawater temperature, configure the related valves as follows:
- Close the HEU bypass valve.
- Open the HEU seawater inlet and outlet valves.
- Open the F.W. (Fresh Water) or Steam inlet/outlet valves to allow heating via:
4. System Status Check
- During ballasting, monitor the SYSTEM STATUS screen to ensure TS301 shows an appropriate seawater temperature.
5. Summary of Key Actions
| Checkpoint | Action |
|---|---|
| HEU Bypass | Close bypass valve to enable heating |
| HEU Seawater Flow | Open seawater inlet/outlet valves |
| HEU Heating Source | Open freshwater or steam inlet/outlet |
| System Monitoring | Check TS301 temperature on SYSTEM STATUS |
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