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AquaCal Technical BulletinWith the use of variable and two speed pumps gaining popularity, the ability to exceed the maximum flow rate of 70 GPM is becoming more common. To avoid potential warranty issues and damage to the Heat Pump, is imperative to install a bypass using a 5 lb. spring check valve whenever the circulation pump has the capability of exceeding 70 GPM, even if the variable pump is set up for a lower flow rate below 70 GPM. Manual valves are not recommended as they will not self- adjust to compensate for different flow rates. The 5 lb. spring check valve will open and close as water speeds change providing proper flow to the heat pump automatically.

Please download and review the Technical Bulletin for available part numbers and installation guidelines.

Download the Technical Bulletin


If you have questions after reviewing the Technical Bulletin, please email your Export Manager.


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