Large Silicon Valley Company

Location: Redwood City, CA

Date: April 2015

ACCO Engineered Systems completed a design-build retrofit of the mechanical cooling systems, which included four new 125-ton Bitzer rotary screw compressors, ABB Soft Starts, two 6-section cooling coil banks, and new compressor controls based on Automated Logic Corporation (ALC) hardware and software.


  • Remove existing R22 refrigerant based compressors and coils and proprietary control system
  • Install new R134a refrigerant based compressor and coils
  • Install new ALC controls for compressor sequencing and control
  • Sequence work to maintain comfort cooling during construction


This was a design-build permitted project that spanned approximately four months. ACCO Engineered Systems lead the design and construction effort, utilizing key vendors, subcontractors and resources to successfully execute the project. Our expertise in designing and installing large tonnage built-up refrigeration systems provided leadership in all aspects of the project, ensuring the owner of continued use of their occupied facility and a turn-key solution. Our attention to detail lead to a well-conceived and timely executed project.

Owner/occupant use of the 11-story high-rise building during construction was maintained without disruption or inconvenience through careful planning and scheduling of activities.

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