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10. RECOMMENDATIONS We recommend a complete retrofit of the HVAC systems in this building due to the conditions of the existing systems as set forth under Section 9 conclusions. Our recommended retrofit would consist of: ' A. One 11) new centrifuged chiller of the heat recovery type of approximately 175 ton capacity. The new chiller would be complete with new cooling tower, chemical treatment system, chilled water pumps, condenser water pump, and cooling tower. The existing 200 ton chiller would be kept as a redundant source of cooling. B. Install approximately eight 18) new roof top air handling units. These units would be of the variable air volume type and would have chilled water coils, pre -filters (30/30), hi -efficiency filters 180%). The units would be designed to take in the prescribed outdoor air 120 dm/person) and to control humidity. The actual number of air handling units would be determined by the details of the final design, however it is felt that three 13) units on the three story portion four (4) on the one story portion and one (1) unit for the two (2) story portion will probably be required to best suit the loads and the phasing requirements. C. Install a new system of chilled water piping from the new chiller to the new roof top units. This system would in general run across the roof tops and thence connect to the coils in the new units. D. ' Connect the new chiller, new pumps, cooling tower and air handling units to the electrical system. Revise service panels as required to support the new electrical loads. E. Install new ductwork, hot water piping, variable air volume terminal control boxes and temperature control one zone at a time making each zone operational upon completion. F. See recommended system diagram in Appendix V. G. Start-up the total system and make operational. The work as set forth above is by nature traumatic in nature since a percentage of the work must occur in and above the ceilings of occupied spaces. Phasing of the work will have to be worked out in detailed to ascertain if a plan can be established that is suitable -to this county officials having jurisdiction. Our suggestion of a phasing plan would be as follows: A. Leave all existing systems operational. B. Install new chiller, new pumps, and new cooling tower leaving existing chiller, pump, and cooling towers operational. C. Install new roof top air handling units. D. Install new chilled water piping from the new chiller to all new roof top air handling units. 33 BOOK, 92 FACE , 57 L_A PR - 51994 J