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Home My WebLink AboutContract 38054-CO8 City of Fort Worth Change Order Request CITY SECRETARY CIO CONTRACT NO. S`� Change Order No. Date TPW Project No. Funding(FAC) 8 (eight) 6/31/11 C 295 541200 208090023880 Facility and Project Description City Secretary Contract No. Nashville Neighborhood Policing District No. 6 38054 ORIGINAL CONTRACT AMOUNT................................................................ $8,216,000 EXTRAS TO DATE..................................................................... $ 90,225 CREDITS TO DATE.................................................................... ($22,711) CONTRACT COST TO DATE.................................................................................................. $ 8,283,514 AMOUNT OF PROPOSED CHANGE ORDER................................................... ...................... $ 3,627 REVISED CONTRACT AMOUNT............................................................................................. $8,287,141 ORIGINAL FUNDS AVAILABLE FOR CHANGE ORDERS............................................................ $ NA REMAINING FUNDS AVAILABLE FOR CHANGE ORDERS......................................................... $ 72,859 ADDITIONAL FUNDING(IF NECESSARY)................................................................................ 0 IN ACCORDANCE WITH THIS CHANGE ORDER, THE CONTRACTOR SHALL: Provide all labor and materials as per attached PCR's: PCR 83-Revise HVAC Controls Sequence of Operations Add $ 4,395 PCR 84-Delete Building Plaque OFFICIAL RECORD (deduct) ($ 768) CITY SECRETARY --FT;4N®ftT*,-T*-- ---------------------------------------------------- Total Add $ 3,627 It is understood and agreed that the acceptance of this Change Order by the contractor constitutes an accord and satisfaction and represents payment in full(both time and money)for all costs arising out of,or incidental to,the above Change Order Contractors Name Crossland Construction Company, Inc. Original Contract Time Additional Approved Time To Date Approved Contrad Time To Date Additional Time For This Change Order 430 Cd 141 cd 571 cd 0 cd Contract Crossla ons ion Company Date Co ctio na er Date �/8/// �0tr/// Chie,Archit r Services Division Date Direct ,Tr sp/orta'tion and Public works Date Project Architect Pe i s+Will Date C' A Date 41 �� C ate Council Action(If Required) Ay °Oo oApproved ❑Disapproved p� o° oo ,0 ��o oZ� Distribution: NO M&lv REQUIRED AmsW by: o o d File - o q Fi Construction Manage 0 0 o° �C AY Projeq Manager 0000°° .tY 0 8-0 2—1 1 P 0 2:3 8 ITIfW Facilities Management �M1< ��tv �CCI'6 ilk �r Change Order Form(12/19 `� �tilDQ CROSSLAND Potential Change Orders CONSTRUCTION COMPANY, INC. Summary,Grouped by Company ID Fort Worth Police and Traffic Facility#6 Project# 08TX09MC Crossland ConobvcHon Co.,fnc. 1100 Nashville Ave. Tel: 214-578-0743 Fax: NA Fort Worth,Texas 76102 Item No Description BLIdgCt Allocation • • Approved Applied Chanqe Oroer Quote Due Ut�oti • .. • -• Ran 001 Trans-Engineered Air Unit 3,995.00 3,995.00 3,995.00 3,995.00 7/IM I Sequence of Operation — Level 1 10.00%Overhead&Profit 399.50 399.50 399.50 399.50 Markup Prolog Manager Printed on: 6/30/2011 TEXAS2008 Pape 1 Proposal Trans U.S.Inc. Prepared For. Date:June 29,2011 Crossland Construction Proposal Number. EA-RP Job Nerve: Fart Worth Neighborhood Policing District 6 Delivery Terms: Payment Terms: Trane Is pleased to provide the enclosed proposal for your review and approval. Engineered Air Unit Sequence of Operation Programming Verify Operation Meets Sequence of Operation Issued June 10 2011 and/or change Programming to meet Sequence of Operation. Price Also includes up to 1 day of Commissioning On-Site....................................................$3,995.00 Ennineered Air Sewwm of Operation issued June 10w 2011 also Included as an attachment for reference. 70 Sincerely, , Robert Patterson-Trans This proposals Is subjed to your acceptance of the attached Trane terms and conditions. FLO-Ammend by Thwe! by Pop 1 of 3 Fort Worth Police Station HVAC System Sequence of Operation for RTU-1 (Engineered Air Unit) Rev 1 Model#FWB63¢/DJ100/0 The non-fused disconnect switch should be placed in the"on"position The service switch should be placed in the"on"position The fire alarm contact should be in the"closed"position The duct high pressure limit contact should be"closed" The Energy Management System controller(EMS)unit should be"on" The EMS should be programmed to confirm that the unit controller has taken the outside air damper to"minimum" open position The unit mounted Variable Frequency Drives(VFDs)bypass switch should be in the"bypass"position(Note:VFD bypass is manual,not controlled by the EMS) The EMS should communicate to the unit controller to turn the unit blowers on;with a slight delay the blowers should come on and run continuously The VFDs bypass switch should then be place into the"VFD"mode allowing the fans to be controlled by the VFDs The VFDs will then adjust the airflow in accordance with a signal from the EMS. NOTE:VFD will operate only down to 35%of the unit CFM(21Hz) Automatic Heating/Cooling Mode The EMS should be programmed with adjustable Discharge Air Temperature(DAT)set point control.With this DAT set at 60 degrees F and communicating this DAT to the unit controller,the unit controller should cycle the six (6)stages of compressors and modulate between the heating and cooling cycles to maintain this DAT of 60 degrees F. NOTE: 60 degrees F is used as an example;the EMS DAT should have a control band of 50 to 90 degrees F. In this mode,the EMS should monitor the return air(room temperatures),air flows,and ambient temperatures in order to maintain and vary the DAT to meet the demands of the end use(temperature in the rooms serviced by the unit). The EMS should also monitor all of the above functions of the unit to insure they are taking place and the unit is responding to the changing DAT set point. The unit controller is also programmed to function with the EMS in each of the following modes as described: NOTE:There is no changeover mode input from the EMS,the mode change is controlled only by the unit controller and is based on the unit's discharge air temperature in relationship to the EMS DAT setpoint EMS Cool Mode Enabled When the EMS communicates to the unit controller a DAT such that cooling is required by the unit,i.e.,60 degrees F,the unit will begin to cycle"on"the six(6)stages of compressors.The unit controller will continue to cycle the six(6)stages of compressors to maintain the DAT set point.The unit controller will also use the VFDs to vary the fan speed to control the air flow which is regulated by the duct pressure and air flow as it varies according to the demand at each end use.Unnecessary mechanical cooling stages(compressors)will be disabled(load shedding)as the VFDs reduce fan speed. The EMS should have a DAT control band of 50 to 90 degrees F in this operating mode. Also,it should be noted that the unit controller is programmed to disable the six(6)stages of compressors when the ambient(outside)temperature drops below 50 degrees F,or when the VFDs shutdown should the air flow drop to 35%of the unit CFM(211-1z)which is to say there is no mechanical cooling at this point. It should also be noted that the condenser fans on this unit are controlled by the unit controller to start when the ambient temperature rises above 68 degrees F. In this mode,the EMS should monitor the return air(room temperatures),air flows,and ambient temperatures in order to maintain and vary the DAT to meet the demands of the end use(temperature in the rooms serviced by the unit). J The EMS should also monitor all of the above functions of the unit to insure they are taking place and the unit is responding to the changing DAT set point. EMS Economizer Mode Enabled When the EMS communicates to the unit controller a DAT such that the can meet the DAT set point in the economizer mode,i.e.,60 degrees F,the unit controller will begin to modulate the mixing dampers to maintain the DAT down to a minimum position for outside air which is established by the factory in the unit controller program. As the ambient temperature rises and reaches 68 degrees F the economizer mode is disabled for a minimum damper position by the unit controller.The EMS should have a DAT control band of 50 to 90 degrees F in this operating mode. NOTE:The economizer mode is disabled for a minimum damper position when the unit is in the cooling or heating mode. In this mode,the EMS should monitor the return air(room temperatures),air flows,and ambient temperatures in order to maintain and vary the DAT to meet the demands of the end use(temperature in the rooms serviced by the unit). The EMS should also monitor all of the above functions of the unit to insure they are taking place and the unit is responding to the changing DAT set point. EMS Heating Mode Enabled When the EMS communicates to the unit controller a DAT such that heating is required by the unit,i.e.,80 degrees F,the unit controller will close the heat switch contacts and send the proper electrical signal to the heating controller (DJM-2).This controller operates all aspects of the gas fired burner including the pilot light gas supply,the electronic spark igniter,gas flow to the burner,combustion air blower,etc.The EMS should have a DAT control band of 50 to 90 degrees F in this operating mode. NOTE: The unit heating controller(DJM-2)disables the heating system on the unit when the ambient temperature is above 90 degrees F. In this mode,the EMS should monitor the return air(room temperatures),air flows,and ambient temperatures in order to maintain and vary the DAT to meet the demands of the end use(temperature in the rooms serviced by the unit). The EMS should also monitor all of the above functions of the unit to insure they are taking place and the unit is responding to the changing DAT set point. General Information on Operation of the Unit 1. The compressor cycle has a minimum run time,a minimum off time and inter-stage timing that must be considered in the EMS program. 2. With the DAT set for cooling,the unit controller logically starts up in heating mode,then switches to economizer,then switches to cooling mode.The unit will always try to meet the DAT set point with the economizer before the cooling mode is activated.With the DAT set for heating,the unit controller logically starts up in the cooling mode,then switches to the economizer,then to heating.Again,the unit will always try to meet the DAT set point with the economizer before the heating mode is activated.This start up cycle takes approximately 5 minutes,or less,and must be considered in the EMS program.NOTE:this is very important in cycling between heating and cooling when the morning ambient air temperature is cool and the afternoon ambient air temperature gets hot. Should the EMS try to cause the unit to cycle too quickly it will cause a problem in the controls. 3. The EMS should be programmed to communicate with the unit controller in such a manner that the EMS actually controls the unit operation by controlling the DAT and monitoring the unit functions at all times to allow the EMS to make adjustments in the DAT.By the EMS controlling and changing the DAT set point as required to maintain proper room temperature,the unit controller will change the modes,control dampers,adjust the VFDs,etc.as necessary to meet the EMS DAT set point. 4. It should be noted,when the unit is turned off and on for any reason,it defaults to the original design DAT set point which has been preprogrammed in the controller at the factory,60 degrees F.The unit will operate in the heating mode as required to meet this DAT set point even if the room temperature increases above 60 degrees F.To get the unit controller to change from the heating mode,the EMS must communicate a new DAT set point to cause the unit controller to make the change from heating to economizer or cooling mode as necessary to meet this new DAT set point from the EMS. CROSSLAND Potential Change Orders CONSTRUCTION COMPANY, INC. Summary,Grouped by Company ID Fort Worth Police and Traffic Facility*6 Project* 08TX09MC Crossland Construction Co..inc. 1100 Nashville Ave. Tel: 214-578-0743 Fax: NA Fort Worth,Texas 70102 Item No DLscriptiori Budget .. D. 011 001 Building Plaque (730.00) (730.00) (730.00) (730.00) 002 Original Profit and Overhead (37.81) (37.81) (37.81) (37.81) �5.1896 Prolog Manager Printed on: 6/30/2011 TEXAS2008 Page 1 CROSSLAND Transmittal Cover Sheet CONSTRUCTION COMPANY, INC. Detailed,Grouped by Each Transmittal Number Fort Worth Police and Traffic Facility#6 Project# 08TX09MC Crossland Construction Co., Inc. 1100 Nashville Ave. Tel: 214-578-0743 Fax: NA Fort Worth,Texas 76102 Date: 7/8/2011 Reference Number: 0281 Jack Durham Aaron Hight City of Fort Worth Crossland Construction Co., Inc. 401 West 13th Street 833 SE Avenue Fort Worth,TX 76102 PO Box 45 Tel:817-392-8072 Columbus, KS 66725 Fax:817-392-8488 Tel:620-429-1414 Fax:620-429-8948 ❑ Acknowledgement Required UPS overnight NNE Jack, Signed copies of the change order... Thanks, Aaron 7/Sf1/ Signature T� Signed Date Prolog Manager Printed on: 7/8/2011 TEXAS2008 Page 1 PROJECT SUMMARY SHEET (Change Order Attachment) PROJECT NAME: Nashville Neighborhood Policing District No 6 BuySpeed No: CSC04)9-00052392 Contract No: CS38054 D.O.E. No: NIA Attachment to Change Order No: 8 Today's Date: 7129111 TOTAL Original Contract Amount $ 8,216,000.00 Extras to Date: $ 90,225.00 Credits to Date: $ (22,711.00) Contract Amount to Date: $ 8,283,514.00 Amount of Proposed Change Order. $ 3,627.00 Revised Contract Amount: $ 8,287,141.00 Contingency Funds Avail. for Admin. Change Orders: $ 144,000.00 Remaining Funds Available for Change Orders: $ 72,859.00 Additional Funding (if necessary): $ - Prepared By: Karen Striker T/PW Business Support