Loren Data's SAM Daily™

FBO DAILY ISSUE OF JULY 23, 2009 FBO #2796
MODIFICATION

Z -- RECOVERY Z--Recovery Act - Replace Fan Coils to meet Heating, Ventilation and Air Conditioning Requirements

Notice Date

7/21/2009
 

Notice Type

Modification/Amendment
 

NAICS

238220 — Plumbing, Heating, and Air-Conditioning Contractors
 

Contracting Office

Department of Veterans Affairs, Shreveport VAMC, Overton Brooks Department of Veterans Affairs Medical Center, Department of Veterans Affairs;Overton Brooks VA Medical Center (90C);510 East Stoner Avenue;Shreveport LA 71101
 

ZIP Code

71101
 

Solicitation Number

VA256-09-RA-0258
 

Response Due

8/5/2009
 

Archive Date

10/4/2009
 

Point of Contact

Carolyn S LeeContracting Specialist<br />
 

E-Mail Address

Contracting Specialist
(Carolyn.Lee3@va.gov)
 

Small Business Set-Aside

Service-Disabled Veteran-Owned
 

Description

The purpose of this amendment is to attach Specification Section 23 82 00, Convection Heating and Cooling Units, and respond to questions submitted for Solicitation VA256-09-RA-0258, Replacement of Fan Coil Units at Overton Brooks VA Medical Center. a. Responses to questions submitted for subject solicitation are attached as pages 3 through 15 of the amendment. b. Date and time for receipt of offers (August 5, 2009 at 2:00 P.M. Local Time) remains unchanged. Question for VA-256-09-RA-0258 Replace Fan Coil Units, 9th Floor, 8 North, 4 West & 2 North QUESTION 1: Should a statement to read "Hot water coil to be in reheat position for dehumidification controlled FCU's "be added? RESPONSE: This is what the "coil setup" is referring to in the "Dehumidification" paragraph. Yes, this statement is true, for the fcu's that are listed to be for dehumidification, the hot water coil shall be in the reheat position. QUESTION 2: Are individual isolation valves currently installed on chilled water and hot water lines? If not will the VA drain the system each day to allow for replacement of the 2 fcu's? RESPONSE: There is isolation valves on the majority of the branch lines supplying the fcu's that can be shut off in order to replace the fcu, valve sets, etc. For equal bid, assume 90% of the branch lines have isolation valves. Otherwise, the VAMC will do what we can to assist in coordinating a shutting down so that the contractor can install valves on these lines. Contractor shall be responsible for providing and installing the 10% of valves that will be needed as well as the fcu isolation valves. Any shutdowns along with all of the work will have to be coordinated and a phased work plan in place prior to any work. QUESTION 3: If existing ball valves are to be replaced, this would result in a complete shut down and draining of the water systems each day for each wing. Is the intent of this statement to actually replace the ball valves which isolate the fan coil units from the main supply lines? Do all fan coil units have 4 ball valves to be replaced? If not which ones do. RESPONSE: Refer to question 2. QUESTION 4, PART I: Are new ball valves required where the do not exist? RESPONSE: Yes QUESTION 4, PART II: If areas are inaccessible will new valves be required? RESPONSE:Yes, unless during construction it is agree upon with the COTR and KO that it is inaccessible. QUESTION 5: Should the statement "Install an automatic control valve on each fcu piping system" read instead, Install an automatic flow control valve on each fcu piping system? RESPONSE: Yes, it calls for a two/three way control valve and an auto flow control/balancing valve. QUESTION 6: Should the modulating valves be on-off control valves? RESPONSE: The hot water valves shall be modulating three way valves and the chilled water shall be two way two position (on/off) valves. Hot water 3 way valves shall be two wire modulated valve that accepts 2-10 VDC or 4-20Ma signal. Three wire floating point control is not acceptable. QUESTION 7: Installing all blow down and control valves over the auxiliary drain pan will result in a very crowded space and will not be easily accessible. Is an auxiliary drain pan required under hot water valve package? RESPONSE: Yes QUESTION 8: Are 3-way modulating control valves required on all units? RESPONSE: See question 6 QUESTION 9: Where are the NAE's to be located? Where does the system tie into? RESPONSE: Install the 2N/4W NAE in either 2E97 or 4E97. Install the 8N/9th NAE in either 8E97 or 9E97. Exact location tbd in construction. QUESTION 10: Should the following be added: Thermostats shall be JC TEC series with N2 protocol and Network Engines shall be NAE4500 series? RESPONSE: Those are acceptable; contractor shall follow the SOW and Specification. QUESTION 11: Are the existing 3 speed fan control switches to be reused? RESPONSE: No, thermostats/fan controls shall be replaced with new 3 speed per SOW. QUESTION 12: What is the intent of the statement that requires the insulation of valve packages inside the fan coil units with fiberglass jacketed insulation? The space available for insulation is extremely limited and normal installation of chilled water valve packages is with minimal insulation but over the drain pan. RESPONSE: Using fiber glass insulation per the SOW for the piping is an error and shall not be used for that application. Here is what the VA will allow for Piping: Chilled Water Pipe 1.Cellular glass <1.5"dia = 1.5"wall thickness 2.Polyisocyanurate <1.0"dia =.75"wall thickness (can only use polyiso up to 1.5"dia pipe max due to flame rating) 3.For chilled water, I will only allow flexible elastomeric cellular on piping inside the fcu due to limited space. It shall be properly glued. <1.0"dia =.75"wall thickness Hot Water Pipe 4.Polyisocyanurate <1.0"dia =.75"wall thickness (can only use polyiso up to 1"dia pipe max due to flame rating) 5.Flexible elastomeric cellular for hot water fcu run outs and inside unit. It shall be properly glued. <1.0"dia =.75"wall thickness **for other pipe diameters, see specification. QUESTION 13: Which of the new fan coil units are increased in size? Are we to check all units? Verifying pipe sizes mean cutting insulation from existing piping and re-insulating to prevent condensation. It will be very time consuming to check all 128 fan coil units. We will need 2 days of engineering staff time to gain access to all rooms and verify these conditions. RESPONSE: The intent is for the contractor to assume that pipe sizes are ok for the new units. However, prior to ordering or installing a unit, contractor shall site verify the pipe sizes are the correct size for the new units. If they are not, advise the COTR so that the issue can be addressed. QUESTION 14: On the 9th floor what type of material is to be used to fill/seal crevasses? RESPONSE: Our shop used a wood trim to cover large gaps around the top and sealed it to ceiling with latex caulk. However, if you have a larger space, you will want to seal with a fire caulk that hardens and cannot be dug out by a patient. See existing for example. QUESTION 15: A specific size hole is required for the s/s plates required on the 9th floor. There are many to choose from. RESPONSE: Match existing sizes of plate holes in each unit for each room. I did not measure, but they look like they are 3/16"to 1/4"diameter holes. All of the existing ones in patient rooms are the same holes size. QUESTION 16: Is it the VA's intent for the contractor to coordinate with the using services to schedule work in rooms, shutdowns, etc.? Normal protocol is to coordinate with Engineering or Contracting. RESPONSE: Contractor is required to coordinate all with the COTR and intent is for them to help coordinate with the user as well. Ultimately, the COTR will be responsible for the user coordination, but it will be a group effort as we can get very busy at times. We want good communication by all for the project to run smoothly with the occupants and patients. QUESTION 17: General note 2: Is the contractor to verify the accuracy of the plans? Plans do not indicate thermostat locations, ceiling types, etc. New units and thermostats will be placed in the same location as the existing units? What exactly are we verifying? RESPONSE: It is the contractor's responsibility to view the site prior to bid, ordering and construction as described in SOW. If the contractor notices any errors or discrepancies, it is their responsibility to notify the KO prior to bid. QUESTION 18: General note 3: Which of the areas will require work after normal hours? RESPONSE: For equal competitive bids, use the following for after hours work: 1.2N LAB= 13 fcu's that have to be done after 4:30 pm. 2.4W Radiology= 2 fcu's/rooms that definitely require work after 4:30pm and 5 Radiologist fcu's/rooms that require either work after 4:30pm or a blacked out dust partition with access in and out for Radioligist. 3.8N Medical Services= 2 fcu's/rooms require work after 4:30pm. 4.9th floor Mental Health= 6 fcu's/rooms on 9East require work after 4:30pm. 3 fcu's/rooms on the rest of the 9th floor require work after 4:30pm. **note: there may be some after hours work for corridor work such as running the elec conduit for controls, that may be required if patient travel is high. **note: specific rooms/fcu's can be provided at later date. QUESTION 19: Water Coil Piping Connection detail: Detail shows pipe hanger supports in unit for valve packages. Is this correct? RESPONSE: They need to be supported. The detail is the standard VA detail. QUESTION 20: Are unions required on each side of the control valve? RESPONSE: Yes QUESTION 21: Is the required test port to be pressure & temperature? RESPONSE: Spec calls out: 2.17 PRESSURE/TEMPERATURE TEST PROVISIONS A Pete's Plug: 6 mm (1/4 inch) MPT by 75 mm (3 inches) long, brass body and cap, with retained safety cap, nordel self closing valve cores, permanently installed in piping where shown, or in lieu of pressure gage test connections shown on the drawings. QUESTION 22: Will a test port in the bypass line on the hot water coil be required? RESPONSE: Yes QUESTION 23: A number of the units on the schedule have no performance data. Will this be clarified? RESPONSE: Use similar fcu performance data of other specified units that have a close cfm to the unit that does not have performance data provided. QUESTION 24: Concerning the fresh air supply requirements, who assumes responsibility if the existing fresh air supply system will not provide the required flow? RESPONSE: After notification, if this occurs, the VA will attempt to adjust existing system to proved the OA. QUESTION 25: Spec. section 09 91 00, Painting: Please specify which items are to be painted, only items that could be found to paint is a boiler plant and chiller plant. RESPONSE: Many of the specifications are general and have information in them that does not apply. Only use the information that applies to this project. You will be expected to repair any damaged areas on the walls where existing unit and thermostat is removed. You may also have to paint any additional items that are installed on or around the units in patient rooms on 9E. QUESTION 26: Spec. section 23 05 12: This section appears to be for HVAC and Steam Generation units requiring separate motors. Is this section specific for fan coil units? RESPONSE: Only use the information if applies to this project. QUESTION 27: Spec. section 23 05 93, Testing, Adjusting & Balancing for HVAC: What are the specific requirements for testing of the fan coil units? The SOW refers only to Entering Air Conditions and Entering Chilled Water Temperature. RESPONSE: Prime contractor shall be responsible for hiring certified tab company to test and balance the hot and chilled water flow, outside air and supply air. QUESTION 28: Spec. section 23 07 11, HVAC, Plumbing, and Boiler Plant Insulation: The SOW requires fiberglass jacketed insulation on piping packages, the spec section does not refer to any requirements or thickness of fiberglass insulation. Also, there is no requirement for insulation for run outs from mains to fan coil units. Please verify thickness and types. RESPONSE: Use insulation as specified in question 12. QUESTION 29: Spec. section 23 09 23, Direct Digital Control Systems for HVAC: This section appears to be for a complete ECC. Are the only items required those stated on the statement of work. Please clarify. RESPONSE: Only use the information if applies to this project. Updating project controls graphics associated with new fcu's is required. QUESTION 30: Spec. section 23 09 23, Direct Digital Control Systems for HVAC: On page 166, Network Architecture, should this read "Network Architecture shall utilize NE protocol for this project". RESPONSE: Will stay as is. QUESTION 31, PART I: Spec. section 23 22 13, Steam and Condensate Heating Piping: Are the new fan coil units piped with steam or hot water? This specification appears to be for steam piping. RESPONSE: Hot water; Only use the information that applies to this project. QUESTION 31, PART II: What is the requirement for the chilled water condensate piping (PVC/Copper)? RESPONSE: Copper insulated per specification. QUESTION 32: Spec. section 23 34 00, HVAC Fans: This section appears to be for fans to be installed in large air handling units with pulleys, belts, filter housings, etc. Please verify. RESPONSE: See added spec section 238200. QUESTION 33: Spec. section 23 73 00, Indoor Central Station Air Handling Units: Spec calls for lights, electrical outlets, etc in units. Is this specification for large central type air handling units not fan coil units, aka Air Terminal Units? Please verify. RESPONSE: Only use the information if applies to this project. QUESTION 34: Spec. section 23 82 16, Air Coils: These coils appear to be for large central type air handling units. Please verify. RESPONSE: Only use the information that applies to this project. See added spec section 238200. QUESTION 35: Spec. section 26 29 11, Low Voltage Motor Starters: This section requires installation of motor starters. Where are these required to be installed? RESPONSE: Only use the information that applies to this project. QUESTION 36: Bid alternates: In order to provide accurate pricing, which alternate bid item is FCU #37 (970 cfm) located on the 8th floor north wing to be included in. All other units appear to be 525 cfm. RESPONSE: Do not delete that fcu as part of deductive bid alternate 1, to keep it fair for all. QUESTION 37: General question: Will the VA move any furniture that may be under the fan coil units and will the offices be vacated during the replacement? RESPONSE: VA will move large items such as freezers temporarily so that work can be done. The user will move the small items that are in the way. There may still be a few items such as permanent mounted shelves that will stay, but I do not see any problems. If the contractor has an issue working on a particular fcu that does not have a removable, it shall be provide to contracting prior to bid. Majority of the rooms will be vacated while the fcu is being changed out. However, there are some rooms (especially the lab) that work 24/7 and they still have to have access in and out of the room even after hours. QUESTION 38: Is there a schedule of priorities in the replacement of units, floor and room numbers. RESPONSE: Some will have to be prioritized, but most not. That will be determined prior to construction. All replacements shall be planned and scheduled. QUESTION 39: What area on each floor will be designated for staging? RESPONSE: To Be Determined QUESTION 40: Will there be an area on site for a 40' storage container RESPONSE: No, but there will be space for two smaller connex boxes. QUESTION 41: As discussed in the walk thru all contractors are to assume that 90% of supply valves are in working condition? RESPONSE: Yes, See question 2. QUESTION 42: Is existing control system under warranty? RESPONSE: No QUESTION 43: What version of metesis is running at the current time? RESPONSE: 4.1 QUESTION 44: Are the NAE's networked together by TCP/IP. RESPONSE: Yes QUESTION 45: What firmware version in NAE's. RESPONSE: 4.1 QUESTION 46: There are 5 units that require Tempt. and Humidity controls. Is there a control sequence on how you want these controlled. RESPONSE: Cooling: Thermostat shall control the chilled water valve to maintain space temperature setpoint. Heating: Thermostat shall modulate the hot water control valve to maintain space heating setpoint, which is three (3) degrees lower than the cooling setpiont. Dehumidification: On a call for dehumidification from the dehumidistat, the cooling valve shall be enabled. The hot water valve shall modulate until the space temperature setpoint is reached. When space humidity setpoint is reached the cooling valve shall return to its normal position. QUESTION 47: In statement of work in the Valves section page 38 it is stated that there be secondary drain pans. We do not feel this is an application that will be viable for this scope of work if there is a drawing or intent for this please advise. RESPONSE: All units shall have auxiliary drain pans. See added spec section 238200. QUESTION 48: Page 236 spec is for air handler and not Fan Coil units. As we see it this does not apply to our scope of work. Please advise RESPONSE: Unless it is referring to any part of a fan coil unit, then it does not apply. Additional Notes As specified at the pre-bid site visit: 1.Some rooms, occupant will have to have access in and out during construction. However, for the most part, they will temporarily move to a different room for that day. It is anticipated that it will take not more than 8 hours to replace and have the new fcu operational. 2.For bidding, assume 90% of the branch lines have isolation valves and contractor will have to install new for the other 10% and VA will assist in shutdown unless contractor can do a successful pipe freeze instead of shutdown. 3.Majority of afterhours work as specified in question 18 can start after 4:30pm. 4.Contractor shall repair wall to match existing around the fcu and thermostat if new units are smaller or wall is damaged in construction. COTR will inspect overall product to make sure it is good workman ship. If it is not feasible to match existing, second application can be a wall plate to match existing colors. 5.Please allow time in your schedule for the VA submittal approval process. Government can take up to 4 weeks to review a submittal. All equipment shall be submitted and approved prior to ordering. 6.Assume one or two conex storage containers to store all materials near the hospital. 7.The control valves shall be installed as part of the factory fabricated piping package for the fcu's to ship with the fcu's. Prefer that the piping package is factory fabricated and installed. 8.Dust partitions shall be required in all rooms as discussed at pre-bid site visit. 9.FCU in 9E14 room requires thermostat in existing lockable box in cooridor with remote sensor to room. 10.Replace existing ceiling tile/grid if damaged in construction. 11.For controls, here is a little explanation of what we have existing: NCM's on arcnet (communicate thru coax) on old system to NIE (network integration engine, fancy NAE) that converts info to new architecture. All NAE's talk extended architecture 4.1. All talk back tcp/ip Ethernet connection (blue cable). Powerline carriers (communicate thru power lines) talk to NCM's. SECTION 23 82 00 CONVECTION HEATING AND COOLING UNITS PART 1 GENERAL 1.1 DESCRIPTION Fan coil units 1.2 RELATED WORK A.not used B.Section 23 05 11, COMMON WORK RESULTS FOR HVAC AND STEAM GENERATION: General mechanical requirements and items, which are common to more than one section of Division 23. C.Section 23 05 41, NOISE AND VIBRATION CONTROL FOR HVAC PIPING AND EQUIPMENT: Noise requirements. D.Section 23 21 13, HYDRONIC PIPING: Heating hot water and chilled water piping. E.not used F.Section 23 09 23, DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC: Valve operators. G.Section 23 05 93, TESTING, ADJUSTING, AND BALANCING FOR HVAC: Flow rates adjusting and balancing. 1.3 QUALITY ASSURANCE Refer to Paragraph, QUALITY ASSURANCE, in Section 23 05 11, COMMON WORK RESULTS FOR HVAC AND STEAM GENERATION. 1.4 SUBMITTALS A.Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES. B.Manufacturer's Literature and Data: 1.Fan Coil units. C.Certificates: 1.Compliance with paragraph, QUALITY ASSURANCE. 2.Compliance with specified standards. D.Operation and Maintenance Manuals: Submit in accordance with paragraph, INSTRUCTIONS, in Section 01 00 00, GENERAL REQUIREMENTS. 1.5 APPLICABLE PUBLICATIONS A.The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only. B.Air Conditioning and Refrigeration Institute (ARI): 440 05Room Fan Coils C.National Fire Protection Association (NFPA): 90A-02Standard for the Installation of Air Conditioning and Ventilating Systems 70-05National Electrical Code D.Underwriters Laboratories, Inc. (UL): 181 05Standard for Factory-Made Air Ducts and Air Connectors 1995 05Heating and Cooling Equipment 1.6 GUARANTY In accordance with FAR clause 52.246-21. PART 2 PRODUCTS 2.1 NOT USED 2.2 ROOM FAN COIL UNITS A.Capacity Certification: ARI 440. B.Safety Compliance: NEC compliant and UL listed. C.Noise Levels: Operating at full cooling capacity, sound power level shall not exceed by more than 5 dB the numerical value of sound pressure levels associated with noise criteria specified in Section 23 05 51, NOISE AND VIBRATION CONTROL FOR BOILER PLANT. Select units at intermediate speed, for compliance with the noise criteria. D.Chassis: Galvanized steel, acoustically and thermally insulated to attenuate noise and prevent condensation. E.Cabinet Type: Not lighter than 1.3 mm (l8 gage) steel, reinforced and braced. Arrange components and provide adequate space for installation of piping package and control valves. Finish shall be factory baked enamel color as selected by the VA Project Engineer. Contractor shall submit color for approval. l.Vertical Unit: not used 2.Horizontal Unit: Hinged bottom access panel with cam lock fasteners. Provide independent removable discharged grilles in front of cabinet. Discharge grille shall be one assembly separately removable from the fcu front panel. Discharge grille shall be 18 gauge brushed aluminum, double deflection. FCU side and front panels shall be easily maintainable with access by removable panels. Each side and front panel shall be separately removable. 3.Concealed Units: Enclosed type with inlet and outlet duct collars. F.Fans: Centrifugal, direct drive, galvanized steel or polyester resin. l.Motors: 3-speed permanent split capacitor type with integral thermal overload protection, for operation at not more than l200 RPM. 2.Provide a fan speed selector switch, with off, low, medium, and high positions. Switch shall have a set of auxiliary contacts which are open when the switch is in the "off" position and closed when the switch in any of the other positions. On vertical units, mount switch in a junction box in the cabinet of each unit. On horizontal units, switch shall be wall mounted. G.Cooling and Heating Coils: 1.Hydronic (two separate coils for cooling and heating): Copper tubes, 10 mm (three eighths inch) minimum inside diameter, not less than 4.3 mm (0.0l7 inch) thick with copper or aluminum fins. Coils shall be pressure tested for bursting and strength in accordance with Underwriters Laboratories, Inc., requirements for pressure tested coils, and shall be designed to provide adequate heat transfer capacity. Provide manual air vent at high point of each coil and drain at each low point. 2.Auxiliary steam coils: not used 3.Electrical heating coils: not used H.Piping Package: Furnished with unit by the manufacturer to fit control valves provided by the controls supplier. Submit manufacturer's detailed drawings of the piping in the end compartments for approval prior to fabrication of the piping packages. Provide ball stop valves on the supply and return pipes. I.Drain pans: Furnish galvanized steel with solderless drain connections and molded polystyrene foam insulating liner: 1.Auxiliary drain pan: Located under control valve and piping to prevent dripping. J.Air Filter: Manufacturer's standard throwaway type, not less than one inch thick, supported to be concealed from sight and be tight fitting to prevent air by pass. Filters shall have slide out frames and be easily replaced without removing enclosure or any part thereof. K.Control valves and unit mounted return air thermostats are to be field installed. PART 3 EXECUTION 3.1 INSTALLATION A.Work shall be installed as shown and according to the manufacturer's diagrams and recommendations. B.Handle and install units in accordance with manufacturer's written instructions. C.Support units rigidly so they remain stationary at all times. Cross bracing or other means of stiffening shall be provided as necessary. Method of support shall be such that distortion and malfunction of units cannot occur. D.Install fiberglass blanket insulation above hydronic radiant panels. 3.2 OPERATIONAL TEST Refer to Section 23 05 11, COMMON WORK RESULTS FOR HVAC AND STEAM GENERATION. E N D
 

Web Link

FBO.gov Permalink
(https://www.fbo.gov/spg/VA/ShVAMC/VAMCLAOBrooks/VA256-09-RA-0258/listing.html)
 

Place of Performance

Address: Overton Brooks VA Medical Center;510 East Stoner Avenue;Shreveport LA<br />

Zip Code: 71101<br />
 

Record

SN01882176-W 20090723/090722000423-896af9d9a17acf2b8d83af9a26cd4654 (fbodaily.com)
 

Source

FedBizOpps Link to This Notice
(may not be valid after Archive Date)

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