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How it works

THE PRESSURE BATTERY™ GEOTHERMAL EXPANSION TANK
HOW IT WORKS
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1. The PRESSURE BATTERY is installed via socket fusion (1-1/4 in) anywhere in the ground loop system. Atmospheric air (14.7 psia or 0 psig) is trapped inside the 3/4 gallon tank by the custom molded rubber bladder (shown in red).
2. When the ground loop has been purged and as the system begins to be pressurized, fluid enters the tank and compresses the air on the 'air' side of the bladder.
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3. As the ground loop system pressure increases the tank fills with fluid and the air side pressure increases. When loop reaches the desired system pressure the tank will contain 1/3 to 3/5 gallons of fluid.
4. When the ground loop pipe expands and relaxes during normal system operation the fluid from the tank is forced back into the loop retaining system pressure that could have otherwise resulted in a flat loop callback and possibly pump failure.