1. 1 LBT Q2 2008 Eng/SW Review PLMG: Plumbing

2. 2 Highlights (Q2/2008) Have recently replaced worn contactors in the Primary Loop chillers Have recently replaced worn contactors in the Primary Loop chillers Some chiller problems identified, i.e. flow in secondary and IC loops and glycol/water expansion and contraction, expansion tanks purchased to install in secondary loop Some chiller problems identified, i.e. flow in secondary and IC loops and glycol/water expansion and contraction, expansion tanks purchased to install in secondary loop 47 deg F plumbing to closed cycle compressors completed, except for insulation 47 deg F plumbing to closed cycle compressors completed, except for insulation

3. 3 Open Issues Technical Technical Chill water lines are not to print Chill water lines are not to print Chill water system design for variable viscosity needs review Chill water system design for variable viscosity needs review Chiller systems operate off of siphon principle, still not good for our dynamic system Chiller systems operate off of siphon principle, still not good for our dynamic system 47 deg chill water loop needs modified, we continue to have issues with the secondary loop 47 deg chill water loop needs modified, we continue to have issues with the secondary loop Schedule Schedule Verify operation, coil sizes, redo prints, put in expansion tanks Verify operation, coil sizes, redo prints, put in expansion tanks Financial Financial Costs have not been fully identified Costs have not been fully identified Resource Resource Moving ahead on definition and solution of issues Moving ahead on definition and solution of issues Consultant needed to address overall system design issues Consultant needed to address overall system design issues Progress limited by other high priority tasks Progress limited by other high priority tasks

4. 4 Planning (Q3/2008)   Redesign 47 deg water system, still needs to be done   Insulate closed cycle compressor chill water lines