LUNA SECONDARY PREPARATORY SCHOOL DALLAS, TEXAS ADDENDUM NO. 1

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1 LUNA SECONDARY PREPARATORY SCHOOL DALLAS, TEXAS ADDENDUM NO. 1 PROJECT: Luna Secondary Preparatory School HKS Project No DATE: 17 December 2013 TO: All Offerors The Proposal Documents shall be amended and/or revised by Addendum hereinafter specified and all Work affected by this Addendum shall be included. Except as may otherwise be described, labor and material for the Work hereinafter indicated shall conform to all requirements of the original Proposal Documents. Arch Drawings ITEM NO. 1.Sheet AD.01 A. Note 6 Waterproofing is to be provided but is not part of the demo scope waterproofing note is also included on the floor plans ITEM NO. 3 Sheet A2.02 and A2.03 A. Add scope note provide signs at all new doors to match existing. Sign standards are included in the addendum. Communication Specifications ITEM NO. 2.Refer to Section ) Fire Detection And Alarm System. A. Revise and expand the existing Silent Knight 5820XL fire alarm panel in lieu or providing a new panel as specified under item 2.21! FIRE ALARM CONTROL PANEL [FACP] beginning on page 15. Mechanical Specifications ITEM NO. 3. Refer to Section ) Energy Management Control System. A. Add the following: CHILLED WATER SYSTEM SEQUENCES: GENERAL All points referenced in this section shall be adjustable from the graphics display both locally and/or remotely however, the engineer may require any or all points to be made read only from the graphics page during commissioning and/or closeout phase. These revisions are to be included in this scope of \\NT07\163\16389\DRAWINGS\ISSUED\ADD1\6250 NO1.DOCX ESTES, McCLURE & ASSOCIATES, INC. REGISTRATION NO. F! Page 1

2 work and shall be performed at no additional cost to this contract. There will be two chillers on this project. Each chiller will be air cooled with scroll compressors. The pumping system is existing and is a variable primary type. The variable primary pumping system has two pumps each capable of handling the designed flow rate. The pumps will be set up on a demand cycle. The pump will be controlled by variable frequency drive (VFD). EMCS INTERFACE WITH CHILLER: The EMCS shall interface with each chiller by a LONworks interface. EMCS contractor shall verify compatibility to the specified chillers interface hardware and provide any interface cards or adaptors required for this scope of work not included. See this section and specification relating to the chiller for the system points to be monitored, adjusted, alarmed and/or trended by the EMCS. Additional requirements found in this section. EMCS INTERFACE WITH PUMP VFD(S): The EMCS shall interface with each VFD by a BACnet interface. EMCS contractor shall verify compatibility to the specified VFD(s) interface hardware and provide any interface cards or adaptors required for this scope of work not included. See this section and specification relating to the controlled pump(s) for the required points to be monitored, adjusted, alarmed and/or trended by the EMCS. CHILLED WATER SYSTEM SEQUENCE OF OPERATION: Air cooled chillers shall be utilized. The chillers shall be staged as required to meet building load. There shall be an automatic isolation valve on each chiller. Each valve should be non!spring return, fail!in!place. There shall be two (2) chilled water pumps with variable frequency drive speed controllers. There shall be ample by!pass valves to meet the minimum flow as determined by the engineer / commissioning agent. Contractor to include in base bid a minimum of three by!pass valves sized to 100 gpm flow!rate. The EMCS shall monitor and control the system supply water temperature set point. The EMCS shall provide a chilled water temperature set point to each chiller via LONworks protocol. The EMCS shall monitor the run load amperes (RLA) of each chiller and total operating amperage. The EMCS shall monitor the building supply and return temperature (common location; hardwired), chiller supply and return temperatures (soft points via chiller interface), primary flow rate (GPM) via flow meter. The EMCS contractor shall calculate the actual building load (tons) based on standard CHW tonnage calculations [(500 x GPM x T) / 12,000], GPM with the flow meter and the temperature difference in each loop and display this in the graphics of the central plant. The EMCS shall calculate the actual electricity usage (kw) of each chiller, chilled water pumping system, and the total operating plant. The EMCS shall monitor the number of machines operating and operate only as many chillers, pumps, as is necessary to meet the current load. EMCS contractor shall provide the interlock wiring and associated conduit between chillers however it shall be the responsibility of the chiller manufacturer to program and commission the interlocks during equipment startup. The flow sensing devices shall be Ifm Efector brand differential pressure transmitters with adjustable contact closures, and shall be provided by and approved by the chiller manufacturer. The EMCS contractor shall provide a secure housing location for all communication devices required to provide a LONworks over Ethernet, LONworks over IP, or LONworks MSTP interface (similar to \\NT07\163\16389\DRAWINGS\ISSUED\ADD1\6250 NO1.DOCX ESTES, McCLURE & ASSOCIATES, INC. REGISTRATION NO. F! Page 2

3 that approved for EMCS provided controllers). Ethernet connection(s) to the gateway(s) provided by the chiller manufacturer shall be provided by others if required. LONworks communication type shall be reviewed and approved by Engineer and commissioning agent. The mechanical contractor shall install a flow meter. The flow meter shall be furnished by the EMCS contractor. Chiller Sequencing: The Chiller Plant EMCS system shall initiate chiller operation through the following sequence of events; Chiller Plant Start Up: The AHU unit control section of the EMCS system shall produce a request for chilled water system operation. When that request is received the following actions shall occur in order; the request must remain true for 60 seconds. Isolation Valves:! The evaporator isolation valve of the lead chiller shall open at this time or at any time when a communicated request for chilled water pump is received via communication from the chiller manufacturer s controls. Chilled Water Pumps Start, Stop and Speed:! The adjustable end switch on the open valve shall verify that the isolation valve is open.! If one chilled water isolation valve proves open then the lead evaporator pump shall start.! Anytime during the first 20 seconds of operation the pump start status switch shall close.! If the status switch does not close then the pump shall be marked as failed and the other chilled water pump shall be started.! The operating chilled water pump speed shall modulate to maintain the system differential pressure set point (adj.).! When the lead chilled water pump cannot maintain the specified differential pressure set point across either chiller, then the second chilled water pump shall be started.! Both pumps would then operate at the same speed signal.! Should the chilled water pumps speed slow to below the lag pump start set point, the lag chilled water pump shall shut down. Set points must be approved by Engineer and commissioning agent. Chilled Water System Differential Pressure Set Point:! The chilled water system differential pressure set point shall be reset based on the maximum AHU chilled water valve position. The maximum valve position shall be communicated to the EMCS from the AHU unit control section of the EMCS. The set point shall ramp linearly from a minimum to a maximum as the maximum valve ramps from a minimum to a maximum. Settings to be approved by Engineer and commissioning agent and based on verification of efficiency and comfort control.! The minimum pump speed shall be set in DDC code non adjustable to insure sufficient motor cooling.! The differential pressure set point shall be limited in DDC code so that no operator can override the max and min values.! An optional manual operator differential pressure set point override shall be available.! The Test and Balance agency shall provide the maximum differential pressure set point for the piping systems. Chiller Request:! The EMCS system shall verify flow as sufficient to run one chiller based upon the chiller manufacturer s evaporator flow nomograph.! The EMCS system minimum flow set point shall be reset based on the number of chillers requested. The flow value of these three stages shall be approved by Engineer and commissioning agent. \\NT07\163\16389\DRAWINGS\ISSUED\ADD1\6250 NO1.DOCX ESTES, McCLURE & ASSOCIATES, INC. REGISTRATION NO. F! Page 3

4 ! The EMCS system shall verify the system chilled water return temperature is high enough to provide sufficient load to start a chiller. Set point shall be approved by Engineer and commissioning agent.! The EMCS system shall at this time request the lead chiller. Chiller Start:! The chiller manufacturer s controls shall verify flow via the mechanical and electrical flow interlocks and start at this time.! The chiller manufacturer s controls shall inhibit rate of loading during startup to prevent over response to the residual chilled water loop temperature which may not be indicative of load.! If any on line chiller should fail, the EMCS shall call for the standby chiller and signal an alarm to the EMCS. Chiller Plant Operation:! The EMCS shall communicate chilled water set point to the operating chillers.! With one chiller operating the system flow shall be monitored for maintenance of minimum flow requirements. Should the system flow fail to meet the minimum flow rate for one chiller then the operating chiller shall be shut down immediately and signal an alarm to the EMCS. Request for multiple chillers:! When the system chilled water supply temperature exceeds the system chilled water supply set point plus a differential (adj.) and the system chilled water flow rate exceeds the minimum flow set point for two chillers a timer shall be initiated.! If these conditions remain true for the time duration determined to ensure sufficient load via testing and verification, a request for a second chiller shall be generated. An optional manual operator request for a second chiller shall be available if the minimum flow requirement is met.! The request for the second chiller shall be communicated to the chiller designated as the Lag chiller.! With two chillers operating the system flow shall be monitored for maintenance of minimum flow requirements. Should the system flow fail to meet the minimum flow rate for two chillers for a time delay (adj.) then the operating non lead chiller shall be shut down.! With two chillers operating the system load (tons) shall be monitored. Should the system load fail to meet the minimum load rate for two chillers (adj.) then the operating non lead chiller shall be shut down.! With two chillers operating a manual operator s request to stop the second chiller shall be operable. Should an operator activate this switch then the operating non lead chiller shall be shut down.! With two chillers operating the system loop delta T shall be monitored. Should the system loop delta T fall below the minimum delta T for two chillers (adj.) for a time period of 15 min (adj.) then the operating non lead chiller shall be shut down.! After the formally operating non lead chiller has stopped for a time delay (adj.) the corresponding chilled water isolation valve and condenser water isolation valve shall close and the condenser water pump shall stop. Chiller Failure Sequence:! The communicated request to start to each chiller shall be monitored for a change of status to Automatic. When an Automatic status is detected then a 5 (adj.) minute timer shall initiate. If the chiller has not returned a status of compressor running by the end of this time period then the chiller shall be marked as failed and an alarm shall be signaled to the EMCS.! The chiller panel manual shutdown switch shall be monitored for an operator shutdown. Should this occur the chiller shall be marked as failed and an alarm shall be signaled to the EMCS. If the chiller is not the Lead chiller then the isolation valves and condenser pump shall close and stop.! If the Lead chiller is marked as failed the Standby chiller shall be requested.! If the Lag chiller is marked as failed the Standby chiller shall be requested.! Operator reset of failed chiller status within the software is required to return the chiller to the standard sequence and should only be initiated after a thorough understanding of the failure and \\NT07\163\16389\DRAWINGS\ISSUED\ADD1\6250 NO1.DOCX ESTES, McCLURE & ASSOCIATES, INC. REGISTRATION NO. F! Page 4

5 its cause has been achieved. Chilled Water Bypass Valve:! The Chilled Water Bypass valve shall be controlled to maintain minimum chilled water flow through an operating chiller. The Chilled water flow set point shall be the result of the minimum flow set point for the number of operating chillers multiplied by 1.5 (adj.) The valve shall be controlled via a PID loop tuned to modulate open to maintain flow. The chilled water bypass valve shall be modulated to maintain minimum flow requirements at all times. Lead Lag Standby Selection:! The Lead chiller shall be determined as the chiller with the least run hours. The run hour comparison and lead selection shall be accomplished either manually or on a scheduled basis so as not to interrupt plant operation. The scheduled time of rotation shall be approved by Engineer and commissioning agent.! The Standby chiller shall be determined as the chiller with the most run hours.! The Lag chiller shall be determined as the chiller that is not Lead and not Standby. Chiller Status Report: Provide an operating status report for each chiller. The report(s) shall provide the present value of all information provided by the chiller manufacturer s control panel. PLANT FREEZE PROTECTION: (only applies to Unoccupied Schedule): When the outside air (OA) temperature drops below 35 F (adj.) the lead pump will be started if not already running and continued on until the OA temperature reached 40 F (adj.). All chilled water valves shall be open to 50% and all chiller isolation valves shall be opened. The primary pump will be controlled from the flow meter and flow should be maintained at minimum flow for all chillers. The by! pass valves shall be closed. The central plant graphics page should indicate that the freeze protection sequence is being implemented. All specified heat tape on these systems shall also be energized based upon the same schedule. POWER FAILURE RECOVERY: For a limited power failure lasting less than one minute, the EMCS shall return the chiller plant to its last state as quickly as possible, after power is restored. All non!critical delay timers and start intervals are to be ignored during this mode. For extended power failure over one minute, the EMCS shall restart the sequence from the beginning. EVENT PROCESSING: All chiller plant control and status events shall be recorded and viewable remotely by server/clients to facilitate troubleshooting. CHILLER FAILURE DETECTION, RECOVERY AND RESET: Upon sensing a chiller failure, the EMCS shall lock out that chiller and close the isolation valve and immediately initiate the start of the next chiller in the sequence. The EMCS will retry the chiller three times if no other chillers are available. The Central Plant graphics shall show any / all chillers that have failed or have been locked out. USAGE SCHEDULE: EMCS shall monitor run time of each chiller at a designated time each day. EMCS shall arrange chiller sequence progression by operational hours with the least logged operational hours being the lead chiller (#01), 2nd least operational hours #2 chiller, etc. EMCS shall provide a means of disabling each chiller for service from its graphics page. EMCS will automatically remove the disabled chiller from the progression sequence until it has been returned to service. Central plant graphics shall also automatically update the current sequencing order. \\NT07\163\16389\DRAWINGS\ISSUED\ADD1\6250 NO1.DOCX ESTES, McCLURE & ASSOCIATES, INC. REGISTRATION NO. F! Page 5

6 LEAD / LAG PUMPING SCHEDULE: EMCS shall monitor run time of each pump at a designated time each day. EMCS shall make the pump with the least operational hours the lead pump for until the next scheduled comparison. EMCS shall provide a means of disabling each pump for service from its graphics page. EMCS will automatically discontinue Lead / Lag Schedule until both CHWP #1 and CHWP #02 are enabled once again. TRENDS: Provide trending data, sample rates and reporting capabilities as described previously in this section. Electrical Drawings ITEM NO. 4.Sheet EP2.01 Electrical Floor Plan Level 2 Section 1 A. Water heater and circulation pump in Mechanical Room #222 to be moved plan East to location as shown on Plumbing drawings. B. All gas is to be removed from Science Classroom #227, and Science Prep #226. Remove gas solenoids, gas switch in control panel, and all other associated gas items. ITEM NO. 5.Sheet EP1.01 Electrical Floor Plan Level 1 Section 1 Provide power in the ceiling for projector in Classroom #143. Circuit outlet to circuit C2!15. Plumbing Drawings ITEM NO. 6.Sheet PL2.01 Plumbing Floor Plan Level 2 Section 1 A. Water heater in Room 222 shall be labeled F1 and shall be 40 gallon electric storage type equal to AO Smith DEN!40, 208V, single phase, 3000 W non!simultaneous operating element, T and P valve, dual element, Watts expansion tank with circulating pump equal to B & G Series 100, 120 V. Refer to detail 8/PL7.01. B. Delete Sump Pump Plan Notes. Mechanical Drawings ITEM NO. 7.Sheet MH1.01 Mechanical Floor Plan Level 1 Section 1 A. See attached sketch. Contractor is to coordinate new medium pressure ductwork with existing VAV boxes in Corridor 1!D. Contractor is responsible for modifying any existing ductwork/ grilles as necessary to accommodate new medium pressure ductwork. B. Existing exhaust ductwork serving first floor Clinic Toilet and Staff Toilet that crosses Corridor 1!D is to be modified. Route 10 Ø exhaust ductwork up through second floor in corner of Custodian room 217. Relocate existing exhaust relief to new location. Patch abandoned roof penetration and floor penetrations to match existing. Ensure weather tight seal. Fire Protection Drawings ITEM NO. 8.Sheet FP2.01 Fire Protection Floor Plan Level 2 Section 1 A. Existing fire main from first floor ceiling to second floor ceiling is existing and located in the middle of Classroom 234. Relocate existing fire main to the southeast corner of the closet in Classroom 234. END OF ADDENDUM NO. 1 \\NT07\163\16389\DRAWINGS\ISSUED\ADD1\6250 NO1.DOCX ESTES, McCLURE & ASSOCIATES, INC. REGISTRATION NO. F! Page 6

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8 8 OFFICE Environmental Signage Solutions 8181 Jetstar Drive Irving, TX Typical classroom and office signs Uplift Education - Sign Type A Date: 11/13/12 Sheet: 1

9 8 5 HOUSEKEEPING 60 8 Environmental Signage Solutions 8181 Jetstar Drive Irving, TX Typical non classroom or office sign Uplift Education - Sign Type B / B.1 Date: 11/13/12 Sheet: 2

10 RESTROOM 60 Environmental Signage Solutions 8181 Jetstar Drive Irving, TX Typical restroom signs Uplift Education - Sign Type C Date: 11/13/12 Sheet: 3

11 11 Mount as close to door as possible, as close to 60 to center of sign 10 1/8 Environmental Signage Solutions 8181 Jetstar Drive Irving, TX Typical exit map holder for each classroom Uplift Education - Sign Type D Date: 11/13/12 Sheet: 4

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