The simplicity of specialized HVAC packages in district heating systems and within the building envelope significantly aids maintainability. Patterson has Flo-Pak® packages for steam or hydronic heating and heat transfer stations, complete chillers, water source heat pump stations, condenser water pump skids and hot water heating circulators. Flo-Pak heat transfer packages incorporate air separators, expansion tanks, suction diffusers, triple duty valves and various types of heat exchangers. Working pressures extend to 175 psig. Variable speed drives are available.

Flo-Pak primary and secondary (booster) pump packages are available with constant or variable speed pumping. They can be configured with end suction, horizontal split case or vertical turbine pumps. Accessories include chiller sequencers and differential pressure transmitters. Variable load primary pumping packages feature variable frequency drives under PID flow control serving up to four loops.