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| Q. |
What are drainback systems in solar water heating system? |
| A. | the system that reverses the direction of flow of transfer fluid |
| B. | the system that tracks the sun |
| C. | the system that pumps excess transfer fluid |
| D. | the system that drains the transfer fluid |
| Answer» D. the system that drains the transfer fluid | |
| Explanation: drainback systems are systems that drain the transfer fluid particularly to ensure freeze protection. this prevents the freezing of transfer fluid and any unwanted damage to the system. | |
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