Non-Pressurized Dual Heat Pump

The new NP series Non-Pressurized Dual Heat Pump flow center is the next evolution in Geo-Flo’s NP series. The ground loop can be flushed without adding external flush ports, because flushing valves are build into the flow center. This saves installation time and additional cost. Plus, piping becomes much simpler. Flo-Link™ double O-ring transition fittings are available for most any application (PE fusion, PVC, threaded, etc.). Top or side connec­tions to the ground loop add even more flexibility. The non-pressurized standing column reservoir design avoids call-backs for under-pressurized loop fields.

Easy installation with optimal design flexibility

The NP series Dual Circuit flow center is specifically designed for applications with two geothermal heat pumps by eliminating the need for T’s, additional piping, check valves, and pump sharing relays. Simply connect the ground loop to the 3-way valves at the top of the flow center (side or top connections) and the heat pumps to the side connections. The pump(s) on each side is powered only when that heat pump is running. There is no easier method available on the market today for two-unit installations.

Pump performance

When sizing pumps for a dual circuit flow center, a pressure drop calculation should be done for the entire system when both heat pumps are running. Pump selection must be based upon both units running. For example, if the left side is a 3 ton heat pump with one pump, and the right side is a 2 ton heat pump with one pump; the pumps in parallel must be able to provide adequate flow and head when both units are running. Consult the pump performance curves in the submittal data here.