SOLICITATION NOTICE
Y -- Replace Bldg. 204 Chiller - Project # 621-22-126 Replace OR Chiller - Project # 621-19-125 James H. Quillen VAMC Mountain Home, TN 37684
- Notice Date
- 4/6/2022 12:02:47 PM
- Notice Type
- Solicitation
- NAICS
- 236220
— Commercial and Institutional Building Construction
- Contracting Office
- 249-NETWORK CONTRACT OFFICE 9 (36C249) MURFREESBORO TN 37129 USA
- ZIP Code
- 37129
- Solicitation Number
- 36C24922B0010
- Response Due
- 4/13/2022 12:00:00 PM
- Archive Date
- 05/13/2022
- Point of Contact
- Craig Ziegemeier, Contracting Officer
- E-Mail Address
-
craig.ziegemeier@va.gov
(craig.ziegemeier@va.gov)
- Awardee
- null
- Description
- REPLACE OR CHILLER, PROJECT # 621-19-125 REPLACE BLDG. 204 CHILLER, PROJECT # 621-22-126 36C24922B0010 RFI S QUESTION 1: Will the drawings be complete with design, schedules and proper information to build this project? Currently the information provided in the drawings does not provide any way to quantify materials or information needed for bidding. ANSWER: The new equipment is to be exact or equal replacement of the existing. The revised drawings include additional information. QUESTION 2: Please provide proper drawings indicating panel location, existing circuitry to be removed, reused, existing pipe sizes for chilled water, existing control vendor, civil drawings for isolation of utilities, structural information for roof mounted chiller including any steel need for new location and any and all information that is typically provided by the VA for a project of this magnitude and scope. ANSWER: The new equipment is to be exact or equal replacement of the existing. The revised drawings include additional information. QUESTION 3: Please confirm if building 204 currently has any warranty requirement or is under warranty and who should be contracted to price any penetrations. ANSWER: Building 204 roof is currently under warranty. Manufacturer is Jones Mansfield. Installer is Eskola. QUESTION 4: Please provide proper spec sections to complete all work as there are many missing sections dealing with electrical and mechanical. ANSWER: The revised specifications include additional sections. QUESTION 5: Please confirm there are no structural supports need for new equipment. This should be provided in the bid documents and is not. ANSWER: The Bldg. 204 chiller is to be an exact or equal replacement of existing. The existing support structure on Bldg. 204 will remain and be reused to support the replacement chiller. QUESTION 6: Will existing supports be reused for the new chillers, if so; has there been review of the proposed basis of design to confirm the footprint and size of any existing supports will allow installation of the proposed equipment? ANSWER: See answer to Question 6. QUESTION 7: Is there lightening protection needed to be removed and reinstalled on the roof top equipment? If so, please provide specs and drawings. ANSWER: The existing lightening protection is to be removed and reinstalled. The revised specifications include additional sections. QUESTION 8: It appears the written SOW is trying to define the project without providing full design documents. Is this project a design build, as there were no requirements found for this or is this a design bid build project? ANSWER: The project is not a design build. It is like for like replacement. QUESTION 9: Can a table of contents be provided for the spec book? ANSWER: The revised specifications include table of contents. QUESTION 10: Are these Chillers standalone or will they hook up to the house water? If they are to hook into the existing VA chilled water; please provide proper drawings providing all information needed for proper install. ANSWER: Both chillers are stand alone. The revised drawings show the points of connection for each one. QUESTION 11: Section 2.12 instructs offerors to include a Sustainable Acquisition Plan in their technical proposals, but a technical proposal is not a required item for bid submission. Please clarify. ANSWER: Section 2.12 does not directly reference a Sustainable Acquisition Plan. For the or Chillers, section 2.12 in the scope of work states: 2.12 The selected chiller and all components, piping, pumps, controls, etc. shall be designed in compliance with applicable standards and codes described in VA program guides, design materials and construction (PG-18-1 and PG -18-2), Design manuals for HVAC (PG-18-10) specifications available in the Technical Information Library (TIL) on VA Website address: (http://www.cfm.va.gov/til/). For building 204, Section 2.12 in the scope of work states: 2.12 All equipment to complete the scope of work shall be new, not used, remanufactured, or refurbished. All work performed on this project must comply with the design manuals and specifications as identified herein. QUESTION 12: Confirm that the Government will allow proposers a minimum of seven (7) days to respond to the RFP starting from the date that the Government responds to 100% of the RFIs received. ANSWER: Confirmed. QUESTION 13: Provide as-builts for the building(s) and surrounding site (utilities). ANSWER: All available as-built information is provided on the revised drawings. QUESTION 14: Can contractors scan and email the bid bond, then the low bidder overnight the bond on bid opening day? ANSWER: At this time, Bid Bonds MUST be received via email and hard copy on or before bid opening. QUESTION 15: Is this a tax-exempt project? ANSWER: No, this is NOT Tax Exempt in accordance with FAR Clause 52.229-3. You are to submit your proposals with federal, state and local taxes. QUESTION 16: If tax-exempt, will the government be providing a tax-exempt certificate to the Prime Contractor for use by subcontractors and vendors? ANSWER: This is a construction contract; we do NOT provide our tax exemption number. QUESTION 17: Can the Superintendent be shared across multiple projects, or should they be dedicated full-time to this project and this project only? ANSWER: Superintendent must be dedicated to this project only. QUESTION 18: Can the Superintendent fulfil multiple roles? ANSWER: Yes. QUESTION 19: If so, can they also fulfil the Quality Control role? ANSWER: Yes. QUESTION 20: What about the SSHO role? ANSWER: No. QUESTION 21: Will the VA provide a spot for the Prime Contractor employee(s) to set up an office or should contractors include monies for a temp office, utilities, etc.? ANSWER: An office is not required. QUESTION 22: Does the VA anticipate this project will require off hours work besides crane picks and shut- downs? ANSWER: We anticipate crane picks and shut-downs to require off work hours, however as we cannot anticipate the contractors means and methods, we cannot definitively answer this question. The contractor shall perform their work so as to mitigate any interruptions in service to the hospital. QUESTION 23: If so, what trades/scopes will be required to perform off hours work? ANSWER: See answer to Question 22. QUESTION 24: Please provide the controls contractor contact information. It appears to be a different contractor than the last time we worked at this facility. ANSWER: Plug Smart, Mike Albright is the contact 1-513-266-2645. QUESTION 25: We don t see the following specs: Electrical conduit, wiring, HVAC controls, mechanical insulation, testing lab services, hydronic pumps, hydronic piping, DDC System for HVAC, TAB, structural steel framing (if needed for rooftop chiller), LV Electrical, Grounding & Bonding, Raceway & Boxes, etc. ANSWER: The revised specifications include additional sections. QUESTION 26: The SOW states the OR chiller service cannot be interrupted at any time. Does this mean this will require a temp chiller? ANSWER: The existing OR chiller will provide chilled water during construction. Any outages required to tie in the new chiller shall be performed in coordinated events and not last any longer that 8 hours during off hours. QUESTION 27: SOW states it is assumed the existing controls and wiring can be reused. The controls cannot. The wiring is unknown. We need to know the power wire size going to the existing chiller. ANSWER: Revised drawings include additional information. QUESTION 28: We re unsure what feeds panel CHP (277/480V panel @ the OR Chiller), but we need the VA to confirm this source has sufficient availability to power the new chiller. The new chiller s exact MCA and MOCP are unknow right now, but the electrical room was unavailable during the PB walk and this must be confirmed. ANSWER: The single lines show where the panel is fed from, the OCP and the conductor sizes. Everything up to panel CHP is to remain the same. QUESTION 29: Is it assumed all new single and 3 phase power will come from the existing panels @ the OR Chiller? ANSWER: All power will be provided from the existing panels. QUESTION 30: If not, new underground power will need to be ran in a duct bank, but we don t know where the electrical room is located to begin to estimate this. If expected to run new power, please provide specs and details of the duct bank. ANSWER: All power will be provided from the existing panels. QUESTION 31: Where is the location of the electrical room that feeds this equipment? Please provide a site plan showing this room and preferably to scale so a proper takeoff can be performed. ANSWER: All power for the OR Chiller will be fed from the existing panels. The existing power feed to the Bldg. 204 Chiller will be reused. The revised drawings include additional information. QUESTION 32: It appears OR chiller piping is heat traced. Please confirm new piping needs to be heat traced. If so, please provide specs. ANSWER: Heat tracing is required. The revised specifications include additional sections. QUESTION 33: Is the rooftop chiller heat traced or on a glycol loop? ANSWER: The Bldg. 204 Chiller is heat traced. QUESTION 34: Is it expected the new B204 Chiller can be manufactured to sit on the existing steel? ANSWER: See answer to Question 5. QUESTION 35: It is assumed the new rooftop chiller needs to be supplied with an integral Chilled Water Pump. Please confirm. ANSWER: The Bldg. 204 chiller is to be an exact or equal replacement of the existing. Additional information is provided in Amendment 003. QUESTION 36: Please confirm the pump sizing remains unchanged on both Chillers. Contractors cannot make this engineering call. ANSWER: The Bldg. 204 chiller is to be an exact or equal replacement of the existing. Additional information is provided in Amendment 003. QUESTION 37: If the existing OR chiller is to be removed, please confirm the new chiller still gets a separate pad. ANSWER: The revised drawings include additional information. The OR Chiller will remain. A new pad is required as indicated on the drawings. QUESTION 38: Please confirm the pipe and fitting type allowed (carbon steel A53 Gr.B, Victaulic, copper sweat, etc.) ANSWER: Please reference the specifications. QUESTION 39: Specs say to include noise attenuation options if there is a need. Contractors cannot be left to make that judgment call. Please confirm if this is needed and the specs on attenuation. ANSWER: Sound attenuators are not required. QUESTION 40: Please confirm if a temp chiller is needed for both chillers or just the OR chiller? ANSWER: The existing OR chiller will provide chilled water during construction. QUESTION 41: Please confirm drawing requirements that contractors are to supply the VA at the end of the project. It mentions elevation drawings to locate equipment, but the General Arrangements would provide this in relation to the site or building plan. Please provide the full list of drawings expected. ANSWER: General Arrangement drawings, including P & ID are required. QUESTION 42: Do these drawings need to be PE stamped? ANSWER: No. QUESTION 43: Please confirm seeding is acceptable and sodding isn t required for damage caused during construction. ANSWER: Re-seeding is acceptable. QUESTION 44: Please confirm the OR Chilled Water Pumps are to be replaced with like in kind pumps and no resizing is required. ANSWER: New equipment is to be exact or equal replacement of the existing. QUESTION 45: When the SOW states shall have quick disconnects for emergency situations does this mean a cam lock type connection, flanges, union, etc.? ANSWER: The VA does not have a preference on what type as long as the system can be quickly configured to support a temporary unit during an emergency situation. QUESTION 46: We also need the size of connection. ANSWER: Additional information is provided on the revised drawings. QUESTION 47: The specs state to provide a temp chiller if necessary, but contractor shouldn t be requested to make that judgement call because. We don t have enough information to make that call. This is a facility maintenance and engineering decision. Please advise if a temp chiller is required, what locations and what size of temp chiller. ANSWER: It is the intention of the VA to use the existing chiller to provide chilled water during this project. Any outages required during this project for the existing chiller shall not last longer that 8 hours for any individual shutdown. Any outages affecting services to the OR shall be shown on the project schedule at the beginning of the project and coordinated with the VA COR. QUESTION 48: The SOW states to provide as a deliverable the following: BOM, Chiller Specs, Equipment Layout, Coordination Study Results and Arc Flash labels. We have the following questions specific to these: a. For the BOM does this mean the VA wants submittals for the various materials (pipe, valves, fittings, hangers, insulation, heat trace, pumps)? b. Chiller specs meaning the cut sheets and equipment data from the manufacturer specific to the chillers being provided under this contract? c. Equipment Layout meaning a General Arrangement from an AE we retain which locates the equipment on the plans, or a generic GA from the manufacturer showing service spaces, equipment dimensions, etc? d. Coordination Study Results meaning Coordination Drawings? These will add costs to the job, as well as time and aren t necessary. e. Arc Flash labels that we produce from a study? What locations (panels and equipment) will this be required? ANSWER: The VA requires submittals for all equipment, materials and components. The VA requires submittals for all equipment, materials and components including cut sheets and equipment data on the new chillers. An Equipment Layout in CAD or PDF format from the manufacturer will be acceptable. The coordination study is an electrical coordination study. This is not required if no new overcurrent protection is installed or the existing overcurrent protection is not modified. Arc flash analysis and labels will be required for any new electrical equipment installed as part of this project and any existing electrical equipment that is to be modified as part of this project. QUESTION 49: For Alt Deduct #1, is the expectation that the deduct comes from the reuse of electrical? If this is the intent, contractors need confirmation from the VA that the existing switchgear, breakers (MOCP) and power wiring (MCA) all are sufficiently sized for the new OR Chiller. We cannot determine this because the electrical room was unavailable during the Prebid meeting; we don t know what the existing infrastructure looks like, or even where its physically located. ANSWER: The new equipment is to be exact or equal replacement of the existing. The VA assumes the existing electrical to be reused is adequately sized. QUESTION 50: If the Alt. Deduct #1 is chosen, please confirm everything remains meaning we will remove the chiller, but the pumps, piping, panels, concrete pad, fence, etc. all remain as-is and the only item scoped for removal is the chiller. ANSWER: Alternate Deduct #1 is removed from the scope. Please see the revised drawings. QUESTION 51: The revised SOW issued in Amendment A001 was specific to the OR Chiller and contained no information related to the B204 Chiller. Please confirm there are no changes to the B204 SOW as issued in the original solicitation. ANSWER: The revised drawings include additional information regarding the Bldg. 204 Chiller. QUESTION 52: B204 specs state contractor is to correctly size this chiller, but this isn t something we can do unless this is a design build project; and we have the full system operating parameters and raw data to analyze the system as a whole. That information wasn t provided to us; we have no way to understand if the existing chiller is adequately sized, too small, too large, etc. That being said, we are requesting the VA remove the liability from the GC and specify the size of chiller needed. ANSWER: The new equipment is to be exact or equal replacement of the existing. The revised drawings include additional information regarding the Bldg. 204 Chiller. QUESTION 53: Please confirm the statement all pumps and/or motors are to be replaced is specific to the Chilled Water pumps only. ANSWER: The new equipment is to be exact or equal replacement of the existing. This will include the chilled water pumps. QUESTION 54: Please specify the expansion tank sizing required for the new rooftop chiller. Same as above, we have no information which we could begin to size a tank. ANSWER: The new equipment is to be exact or equal replacement of the existing. This will include the expansion tank. QUESTION 55: Similar to the OR Chiller, please provide the specs and requirements for the sound attenuating options for this chiller. ANSWER: Sound attenuation is not required. QUESTION 56: The SOW states to provide a temp chiller during demo/reinstall of the rooftop chiller. Please advise where this chiller will be set and where power can be pulled from for the electrical connection. ANSWER: A temporary chiller is not necessary for the building 204 Rooftop unit. The contractor shall utilize the existing chiller until the new chiller is ready to be tie into the existing utilities. we intend for the electrical connection to be from the same source. The contractor shall verify that the power is sufficient to feed the new chiller at the beginning of the project. The new chiller and all utilities shall be activated during a single tie-in event during the weekend QUESTION 57: What size temp chiller is needed to supplement the rooftop chiller? Contractors don t have enough information to size this, which is ultimately an engineering calculation, that GC s shouldn t be responsible for. ANSWER: Temp chiller is not required. QUESTION 58: Does it also require an expansion tank? ANSWER: We are assuming it is referring to the temp chiller referenced in question 57. If this is the case, temp chiller is not required. QUESTION 59: Please confirm the Cx agent is hired by the GC or can GC s self-perform Cx with inhouse staff. ANSWER: The VA will contract separately for Cx services. QUESTION 60: The way we interpret the SOW is that the Cx agent will oversee demo, reinstall and start up. Typically, the Cx agent is there during commissioning and not demo or installation. Please clarify the expectation regarding the Cx agent s onsite presence and during what stages of construction understanding the more they are onsite, the higher the pricing to cover these visits. ANSWER: The Cx will be onsite once during installation and as needed during commissioning. QUESTION 61: The SOW states contractors are responsible for reworking of the electrical, but similar to the OR Chiller, we were unable to access the electrical room that feeds this chiller. We have no way to understand what work may or may not be required. Please clarify the electrical scope required considering the existing wiring size, the breakers, switchgear, etc. This isn t something we can determine with the information given and the lack of access to the electrical room. ANSWER: The new equipment is to be exact or equal replacement of the existing. The VA assumes the existing electrical to be reused is adequately sized. QUESTION 62: Are new gates required in the new fencing? If so, how many and where? ANSWER: New gates are indicated on the revised drawings. QUESTION 63: The drawings are to scale so we have the following questions: a. What are the dimensions of the new OR Chiller pad? b. How many LF of fence are needed? ANSWER: The revised drawing is to scale. The pad dimensions on the drawing are proposed and are approximately 16 -4 x 34 -3 . The actual dimensions will depend on the General Arrangement allowing for equipment size, service spaces, etc. Approximately 75 LF of new fence with a single new 4-foot gate is proposed. The actual length of fence will depend on the pad size, General Arrangement, service space requirements, etc. QUESTION 64: Are there existing Chiller Shop drawings or P&ID s? ANSWER: All known information on the existing OR Chiller is included in the revised drawings. Amendment 003 includes submittal data on the Bldg. 204 Chiller. QUESTION 65: Please provide Chiller Connection details showing all components needed (temp indicators, flex connects, strainers with blow downs, pressure indicators, etc). ANSWER: It is intended that the new chiller configurations match the existing chiller configurations and comply with the design manuals located at http://www.cfm.va.gov/til/. QUESTION 66: Background: Replace Building 204 Chiller. Chiller is currently located on the roof of building 204. Is the roofing under the existing chiller currently under warranty? ANSWER: See answer to Question 3. QUESTION 67: Can contact information be provided for the roofing contractor that holds the current warranty? RFI: What type of roofing is currently installed at the location of the chiller and what is the approximate thickness of the insulation? ANSWER: See answer to Question 3. For exact or equal replacement, the roof should not be affected. QUESTION 68: What is the structure of the building at the roof level? Examples: cast in place (mild steel or post tension), structural steel with corrugated decking, bar joists with decking, metal or wood truss system, etc. ANSWER: See answer to Question 5. QUESTION 69: RFI If structural steel is the main component is the structural steel/bar joist and/or decking fireproofed? ANSWER: See answer to Question 5. QUESTION 70: Background: Replace Building 204 Chiller. Site observation existing Lighting protection on existing chiller. Is the lighting protection currently certified by an independent party? Can contact information be provided for the certifier? For bidding purposes is the lighting protect to be removed from the existing chiller and reinstalled on the new chiller without needing to recertify the lighting protection system? ANSWER: There is no current master label for the existing lightning protection system There is no contact for any current certification The existing lightning protection will be required to be reinstalled on the new chiller per current NFPA 780 requirements. QUESTION 71: Background: Replace Building 204 Chiller. The building 204 is supplied by a 120 ton chiller unit, located on the roof of building 204. A new 120 ton chiller is to replace the existing chiller. Existing chiller is mounted on structural steel framework that penetrates the roofing system to the structure below. Is it the Government s intention to utilize the existing unit support (steel framework) for the new chiller? Is it a reasonable assumption that the existing chiller and new chiller will be very similar in size and weight? This would eliminate several unknown conditions. If the existing steel needs to be modified, is it best to address this as a change order to the contractor or should each respective bidder carry an allowance amount determined by the government? ANSWER: See answer to Question 5. QUESTION 72: Background: Replace Building 204 Chiller. Scope of Work 2.11 Contractor is responsible for crane rental. All crane work is to be scheduled after normal working hours and /or weekends. The most logical placement of the crane would be on the street in front of the building. Can a utility plan of the road be provided to show any underground tunnels, structures, storm piping or any other subsurface void that would impact the placement of the out riggers for the crane? ANSWER: Crane location is shown on Sheet G-001 of the revised drawings. QUESTION 73: Background: Replace Building 204 Chiller. Scope of Work 2.16 a) Elevation drawings indicating the location of new equipment. Deliverables 4.1 Contactor shall submit preliminary drawings. Request the Government clarify drawings refer to standard equipment shop drawings and not stamped engineered drawings. It is the contractors understanding that this is not a design build contract. ANSWER: See answers to Questions 8, 41 & 42. QUESTION 74: Background: Replace Building 204 Chiller. Scope of Work 2.16 d) Network diagrams for metering and /or control devices internal to the new equipment. What is to be metered? Contractor wishes to clarify that metering for electrical consumption or flow meters to track chilled water are not part of the contract. ANSWER: There is no electrical metering required for this equipment. The diagrams are for the internal electrical and controls of the chiller, which should come with the chiller unit from the manufacturer as part of the O&M documentation. It should show all internal electrical connections and if they are connected to an external system. See answer to Question 94. QUESTION 75: Background: Replace Building 204 Chiller: Scope of work 2.16 b) Control schematics for the new equipment. Can control schematics be provided for the existing chiller along with the brand/type of controls, and the contractor that maintain controls? What is the current hardware/software that new chiller would need to integrate with? ANSWER: There are no schematics outside of what York has inside the chiller. The only thing that is outside of factory is the pump control / Chilled water flow safety setup. That is ran from the BACnet device between the pumps and feeds go / no-go to the chiller just as a flow switch would do through a set of NO contacts (open = no flow / closed = flow) this controller is tied into a wireless BACnet transceiver along with the existing York chiller) The pump controller and York chiller are both BACnet MSTP devices and are as stated before wired via MSTP 2 conductor shielded cable into the BACnet wireless device which communicates wirelessly with another device (BACnet) QUESTION 76: Background: Replace Building 204 Chiller: Scope of work 2.17 a) On site commissioning functional testing. Clarify that this is to occur with Contractor (with assistance of subcontractors) and VAMC personnel. This is not intended to be a third party commissioning agent hired by either the Government or the Contractor. ANSWER: See answer to Question 60. QUESTION 77: Background: Replace OR Chiller. Amendment sheet M 101 shows a new concrete pad adjoining the existing chiller pad. Is the Government intent for the new pad to be connected to the existing pad? If the new pad is to be connected to the existing pad is it to be doweled together with rebar or isolated with an expansion/caulk joint? If not is the space between the old and new pad to be filled with 57 stone or topsoil and grass seed? ANSWER: See expansion joint detail on Sheet M101 of revised drawings. QUESTION 78: Background: Replace OR Chiller. Amendment sheet M 201 Bollard detail states fill with concrete prior to setting in footing. Would it be acceptable to fill the Bollard with concrete after setting the bollard in the footing? This would make the installation of the bollard lighter and there would be less potential for back sprain for the individual installing the bollard. ANSWER: Bollard is to be constructed per the detail on Sheet M-001. QUESTION 79: Background: Replace OR Chiller. Amendment sheet M 101 shows a new concrete pad and bollards extending 5 0 into the earth. Can an existing utility plan be provided to avoid conflict with existing underground utilities? ANSWER: Exact locations of site utilities are not known. QUESTION 80: Background: Replace OR Chiller. General statement calls for removal of existing fencing and new fencing to be installed. Will new fencing match existing chain link fence? For bidding purposes can Government specify size of gate or gates? Is the gate to be locked with Government provided pad lock? If not can a cut sheet or specification be provided to Contractor for keying locking mechanism. ANSWER: The new fencing shall match the height of the existing and shall conform to Section 32 31 13 in the revised specifications. See New Work Note 9 on Sheet M-101 of the revised drawings. The VA will provide a lock. The VA will provide a lock. QUESTION 81: Background: Replace OR Chiller. Can the new chiller be set during normal business hours? This would require the road to be blocked and/or a portion of the parking lot to be blocked off. ANSWER: Crane work will be done during non-business hours. QUESTION 82: Background: Replace OR Chiller. The understanding is that the new chiller will be the primary chiller. If the new chiller becomes inoperable then the existing chiller will provide cooling to the OR by a manual transfer. Will the existing piping be reconfigured to be physically connected to both the new and existing chiller and isolated from each other with valves? In the event of a failure on the new chiller valves would be closed and opened for the existing chiller manually? Is there to be a third set of valves for connections to a temporary chiller in the event both the new and existing chiller fail? ANSWER: The new and existing piping will be configured to allow the new and existing and potential temporary chillers to be independently isolated from the chilled water loop piping. Reference Sheet M-101 of the revised drawing set. All isolation valves will be manually operated. The existing valves and connections for a temporary chiller are to remain. QUESTION 83: The solicitation indicates that the existing electrical service can only provide power for one chiller at a time. Can the Government specify the method that is desired to transfer power from the new chiller to the existing chiller in the event the new chiller is no longer operational? ANSWER: The intent is to only allow one chiller to operate at a time. This can be done several ways, it can be done through an interposing relay that does not allow one chiller to be energized if the other chiller is energized, it can be accomplished through the controls as a permissive input to the controller that will not allow the chiller to start if the other chiller is running, or a manual transfer switch can be used to only allow power to one chiller unit at a time. Depending on how the pumps are energized, this could get a little more complicated in regards to interlocking. QUESTION 84: Will maintenance require removing wiring from the line side of the breaker serving the new chiller to the line side of the breaker serving existing chiller? ANSWER: Depending on how the new chiller is to be wired into the existing system, possibly. QUESTION 85: Will there be a cut sheet/product data provided for some type of a transfer switch including a wiring diagram? ANSWER: Only if a manual transfer switch is required. QUESTION 86: Will there be kirk keys for the breakers that serve the new chiller and the existing chiller along with a wiring diagram? ANSWER: If there is a manual transfer switch yes. I have no information on the new chiller to base a design off of and no information on how they want this system to operate. QUESTION 87: The controls appear to be interlocked to the main building with a WIFI configuration. Can control schematics be provided for the existing chiller along with the brand/type of controls, contractor that maintain controls? Current hardware/software that new chiller would need to integrate with? ANSWER: There is no Interlock nor WIFI (Wi-Fi is illegal!) The communications is BACnet MSTP tied to a wireless BACnet Transceiver that communicates to the main automation system. Pretend the Wireless part does not exist , all that will need to be done is a BACnet address set on the new chiller as Address 3 and 2 conductor shielded wire pulled from the pump control box to the new chiller (Pump control box is current end of line so it will have to be daisy chained from that device to the new chiller for proper communications to work, new chiller mac address set to 3 and the baud rate set to 38,400) The devices in the field act like any normal BACnet device ...
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