Multi-Stack Heat Pumps at VA Medical Center- Lebanon, PA

Walker Federal Services provided comprehensive design-build services for the replacement of the multi-stack heat pump system serving Building 37 at the Lebanon VA Medical Center. The project involved evaluating existing mechanical systems, developing complete construction documents, and performing the demolition, mechanical, electrical, and controls work required to modernize the building’s heating and cooling infrastructure.

Our team conducted field investigations to verify existing conditions and coordinated closely with VA facility personnel to develop a system replacement strategy that maintained building operations throughout construction. The existing failing multi-stack heat pumps and associated components were safely removed and replaced with new high-efficiency heat pump units installed on concrete housekeeping pads. The project also included replacement of deteriorated piping, valves, insulation, and electrical wiring where necessary, as well as the removal of obsolete control components.

In addition to the mechanical upgrades, Walker Federal Services modernized the building automation system by converting the HVAC controls to a Distech Tridium platform, installing a new JACE controller, and integrating the new equipment through BACnet communication protocols. This upgrade allowed the facility to centrally monitor and control the HVAC system while improving operational efficiency and long-term maintainability.

The project also involved flushing and replacing the existing ground loop water with newly treated water in accordance with manufacturer recommendations and installing new heat pump equipment designed with stainless steel heat exchangers for durability and performance. All work was performed in compliance with applicable VA design criteria, NFPA codes, and safety standards.

Construction activities were carefully phased to ensure that heating and cooling services remained operational for Building 37 while minimizing disruption to patients, staff, and daily medical center operations. Upon completion, the upgraded system improved HVAC reliability, enhanced energy efficiency, and provided a modernized mechanical system capable of supporting the facility’s long-term operational needs.