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HomeMy WebLinkAbout5.F.8. Replacement of Compressors in Library Air Conditioning System S:F~ City of Shakopee MEMORANDUM CONSENT TO: Mayor and City Council Mark McNeill, City Administrator FROM: Kris Wilson, Assistant City AdministratorJW Duane Toenyan, Facilities Maintenance Supervisor SUBJECT: Replacement of Compressors in Library Air Conditioning System DATE: April 30,2010 Introduction The Council is asked to consider authorizing replacement of two compressors within the Library's air conditioning system. Background The Shakopee Library has a York air conditioning system that relies on 6 compressors, working in two circuits of three compressors each. If any of the three compressors within a circuit fails, the entire circuit shuts down. Currently, two compressors within one circuit have failed and cannot be repaired. The Library's early season cooling needs can be met by the remaining circuit, but there is no back-up and no second circuit to maintain the building's temperatures when we get into the hottest days of summer. The City has been working with Owens Company to diagnosis the problem and has received a quote for purchase and installation of two new compressors (see attached). The quoted price is $12,300 plus the cost of new coolant (Freon) which will have to be placed into the unit once the compressor replacement is complete. The quantity of coolant needed is not known at this time, but is expected to cost several hundred dollars. While the York air conditioning system is original to the Library building, we have had to replace numerous compressors in the 7 years since the building opened. Staff is recommending replacing compressors yet again because we recently completed a recommissioning of the building's mechanical systems as recommended by the energy auditor we're working with. This recommissioning, which was completed in December of2009, placed the building on a computerized schedule for heating and cooling. In addition to reducing the building's energy consumption, it is our hope that these changes will put less wear and tear on equipment such as the air conditioning system and will therefore break the trend we've been experiencing of having to replace compressors on a regular basis. If this turns out not to be the case, and we continue to experience compressor failures, even with the new computerized schedule, staff is then likely to recommend replacement of the entire unit. Budget Impact The adopted budget for the Library building includes $15,000 for building maintenance such as this. However, $3,200 of this has already been spent and additional costs are likely throughout the year. A major HV AC expenditure such as this was not anticipated. Therefore, staff is asking Council to authorize purchase of these compressors from unallocated funds in the General Fund fund balance. If Council approves this action, the actual budget amendment to transfer currently unallocated funds into the Library budget will be brought forward by the Finance Director at a future Council meeting. Relationship to Goals. This is a housekeeping item. Requested Action. If the Council concurs, it should offer a motion to authorize staff to proceed with replacement of two compressors for the Library air conditioning system, from Owens Companies, at a cost not to exceed $13,000 to be taken from currently unallocated General Fund dollars. owens Owens Companies, Inc. 930 East 80th Street Bloomington, MN 55420-1499 952-854-3800 Fax: 952-854-3769 www.owensco.com April 27, 2010 Mr. Duane Toenyan City of Shakopee 129 South Holmes Street Shakopee, MN 55379 SUBJECT: Library Chiller Repairs P-7838R Dear Duane: Owens will complete the following repairs on the York packaged unit at the Library. . Replace two compressors in circuit #2 . Replace the isolation valves that are leaking through for circuit #2 . Modify the hot gas by-pass operation . Replace the oil in circuit #1 compressor . Replace the driers in circuit #1 The compressor replacement will require removing all refrigerant as the isolation valves do not hold. We have included replacement of these valves. Once the new isolation valves are in place, future repairs to the refrigeration circuits will not require removal of the refrigerant. The two new compressors in circuit #2 include new oil in that system. We recommend replacing the oil in the compressor in circuit #1 so that clean, new oil is throughout the system. This is mentioned above and is included. Replacement of the liquid line driers is also recommended as these driers are designed to catch contaminants in the system and once you install new compressors, oil, etc. it is recommended to also replace the driers. This is included in the above services. The system is low on refrigerant however we do not know by how much. This cost is not included, we will notify you before proceeding. The price installed for all above services is Twelve Thousand Three Hundred Dollars and N 0/1 00. .. .. . . . . .. . .. . .. . .. . .. . . .. .. . .. . ... ... . .. .. . .. . .. . .. . .. . .. . . .. . .. .. . ... ... .. . . .. .. . .. . .. . . .. . .. .. . $12,300.00 All parts are currently in stock on the east coast. Shipping will take about a week or more and installation of all components will take about a week. Building Services. Engineering' Water Treatment Mechanical Contracting' Automation . Home Comfort OWENS TECHNOLOGY COMPANY Locally Owned' Nationally Recognized. Since 1957 An Equal Opportunity Employer Mr. Duane Toenyan April 27, 2010 Page Two If you would like to proceed, please authorize and return a signed copy of this proposal to my attention. If you have any questions, please call me directly at 952~703.5727. Thank you. Sincerely, OilS COM?NIES' INC. ~ec~n~~~~nl MT07838R.cfc Accepted by: PURCHASER: CITY OF SHAKOPEE Signature Title Date