1. 1 LBT Q1 2009 Eng/SW Review PLMG: Plumbing, Chiller Systems

2. 2 Highlights (Q1/2009) Both utility building chillers have leaks in the condensing coils, arranged for replacement Q2 Both utility building chillers have leaks in the condensing coils, arranged for replacement Q2 The utility chiller freon charge has been leaking The utility chiller freon charge has been leaking Winter and summer chillers were reset back to factory settings and have been working well since Winter and summer chillers were reset back to factory settings and have been working well since Utility building chillers were also reset to factory settings, however, we have had problems ever since Utility building chillers were also reset to factory settings, however, we have had problems ever since

3. 3 Open Issues Technical Technical Chill water system needs review Chill water system needs review Variable viscosity Variable viscosity Expansion and contraction with temperature Expansion and contraction with temperature Restrictions Restrictions Schedule Schedule Verify and monitor operation Verify and monitor operation Keep up with PM’s Keep up with PM’s Financial Financial Utility building chiller coil replacement: $24K Utility building chiller coil replacement: $24K Installation of valve in by-pass : $2K Installation of valve in by-pass : $2K Resource Resource Consultant needs to be located/ need engineering support Consultant needs to be located/ need engineering support

4. 4 Planning (Q2/2009) Insulate closed cycle compressor chill water lines   Consult about operation and options to improve   Replace utility building condensor coils   Improve operation and reliability of the utility building chillers   Install valve in 45 deg F loop by-pass