Questions and Answers.pdf

Questions and Answers

1. Is supplemental electric resistance heat required in each unit? If so, please state the required kW so that the unit’s electrical load can be matched to the 50 A breaker specified. If not, we will quote heat-pump heating only.

- No supplemental electric resistance heat is required for these units.

2. Unit Type: Are the requested units packaged units (self-contained units), or are they another type of HVAC system? Is the united a pocket unit?

- It should be a package unit with the modifications listed in the requirements. (i.e. breaker panel and connectors)

3. Mounting and Configuration: How are the units intended to be mounted or installed?

Will they be installed as a standard packaged system or as a split system?

– The units are intended to be placed in their metal pallet frames near the trailer and connected with Flexible ducting to the trailer.

4. Could you please confirm the exact delivery location for this requirement, including the complete shipping address?

Armstrong Flight Research Center 4876 Lilly Ave.

B4840 Edwards, Ca. 93523

5. Does NASA have drawings or photographs of the existing HVAC equipment and transportation frames?

6. What are the maximum allowable dimensions and weight for each HVAC unit and assembled stack?

– The assembled stack should be able to be placed height wise in a high cube Iso Shipping Container. The length and width of the units is of less concern as long as it isn’t significantly larger than the base HVAC unit(something like 6 to 10 inches larger.

7. Are the units expected to be fully assembled, wired, and operational upon delivery?

- Yes. The units need to be fully functional and tested for capability prior to delivery.

8. Is there an approved manufacturer or reference model?

- No, as long as they meet the requirements of the SOW.

9. What is the required delivery location and delivery schedule?

Armstrong Flight Research Center 4876 Lilly Ave.

B4840 Edwards, Ca. 93523

10. Are there structural load, vibration, transport, or environmental qualification requirements for the frames?

- Only what is in the SOW

11. Does NASA require independent electrical inspection, certification, or documented operational testing?

- No

12. Scope of Work: Is this procurement limited to furnishing and delivering the four fully assembled HVAC units, or does NASA also require on-site installation, integration, testing, or commissioning?

- No Installation, integration or on-site testing is required. SOW is for units that are delivered as “plug and play” units that should be tested and ready to use upon delivery. This requirement is only for what is listed in the SOW.

13. Equipment Configuration: Will NASA accept commercially manufactured HVAC units that are modified by a qualified manufacturer or fabricator to meet all specified electrical, connector, ducting, and stackable-frame requirements?

- Yes.

14. Delivery Schedule: Does NASA have a preferred or required delivery timeframe following contract award, or should oƯerors propose their earliest achievable delivery date?

- The units are required as soon as possible, no longer than 60 days ARO.

January 2027 is the need-by date. We will not accept delivery dates provided after ARO. The delivery date MUST be provided prior to selection.

15. Are packaged or split-system heat pumps required?

- The expectation is for packaged heat pump units modified to meet the SOW requirements.

16. Should the heat pumps be air-source or water-source?

-Air Sourced

17. Is there a minimum eƯiciency requirement (SEER, EER, or COP)?

- No

18. Are any additional technical drawings, specifications, or approved configurations available?

- Previous units have been delivered as built per the requirements. NASA does not have technical drawings for those units.

19. Scope of Work: Is this requirement strictly for the supply and delivery of four fully configured HVAC units, or does it include on-site installation, electrical hookup, testing, or commissioning?

- SOW is for Supply, modification and delivery of units. Units are intended to be “Plug and Play” when they are delivered and should not require installation, testing, commissioning or on-site testing.

20. Equipment Manufacturer: Although the solicitation specifies "Brand Name or Equal To," is there an existing or preferred HVAC manufacturer/model that the Government intends to replace or match?

- No, as long they meet the requirements in the SOW.

21. Equipment Modification: Would commercially available 5-ton heat pumps modified to meet the specified electrical, ducting, and structural requirements be acceptable?

- Yes and expected

22. Electrical Configuration: Is a wiring diagram available illustrating the required power connection between the A and B Units?

- Pinouts and connector were specified in the SOW.

23. Delivery Schedule: Does the Government have a required delivery deadline, or may oƯerors propose their anticipated delivery timeline after receipt of order (ARO)?

- Answered on Question 14.

24. Testing and Documentation: Are factory acceptance testing, structural load testing, certifications, or specific technical documentation required before delivery and acceptance?

- Yes

25. Pricing Format: Would a single firm-fixed-price quotation covering all four HVAC units, required modifications, and FOB Destination delivery be acceptable, or is an itemized pricing breakdown preferred?

- Yes, but itemization is preferred to ensure requirements are being met.

26. Any special delivery instructions, receiving hours, loading dock requirements, or advance scheduling requirements?

- Receiving hours are Mon-Thurs 0700-1530. Dock or forklift acceptable.

Advance scheduling is required to ensure drivers base access (minimum 7 days in advance).

27. Whether any special packaging, labeling, or delivery documentation is required?

- Delivery documentation is required.

28. Could you share photos or drawings of existing units showing the metal frames and electrical connections? If photos are unavailable, would an on-site inspection be possible?

- See above for photos. On-Site inspections can be coordinated.

29. Can the four units be delivered in two shipments, with one complete A/B set per shipment?

- Yes

30. The SOW specifies 16-inch duct connections. Our supplier is concerned about restricted airflow and possible coil freezing. Would 20-inch connections be acceptable, or must they retain the specified 16-inch connections?

- The current system is set up for 16-inch connections and cannot be easily modified.

31. Is installation or on-site commissioning required, or is this a supply-and-delivery requirement only?

- SOW is for Supply, modification and delivery of units. Units are intended to be “Plug and Play” when they are delivered and should not require installation, testing, commissioning or on-site testing.

32. Will manufacturer technical documentation demonstrating compliance be acceptable with the quotation?

- YES

1. ExisƟng Equipment and Intended ApplicaƟon Is this procurement intended to replace exisƟng HVAC equipment or support a new installaƟon? – Replace exisƟng equipment.

If replacing exisƟng equipment, would it be possible to provide the manufacturer/model informaƟon, electrical schemaƟcs, and any available interface-control documentaƟon?

- The current units were built to the wrong specificaƟons and do not serve as an acceptable template for these units.

AddiƟonally, is there an exisƟng external HVAC control system with which the new units must interface?

- Bard Lead-Lag Controller (MC4002). The SOW list the pin outs and connector for the control cable

2. Control Circuitry and Interface (SOW Requirements 3 and 4)

The SOW idenƟfies a Meltric 07-P4061 control connector and specifies the following pin assignments:

Pin 1 – 24 VAC Common (Bl) Pin 2 – Spare (Br) Pin 3 – Fan (G) Pin 4 – 24 VAC Supply (R) Pin 5 – Heat (W) Pin 6 – Cool (Y)

We would appreciate clarificaƟon regarding the intended operaƟon of this interface.

Specifically:

a. Is the HVAC unit expected to provide the 24 VAC control power, or will this power be supplied by an external controller? -Both A and B units shall provided 24VAC control power.

b. When a heaƟng demand is received through the W circuit, is the HVAC unit expected to automaƟcally determine whether to operate in heat-pump mode or supplemental electric heaƟng mode? No Supplemental electric heat is required.

c. Is the HVAC unit expected to manage reversing-valve operaƟon and the transiƟon between heat-pump and supplemental heaƟng internally? Please Refer to the Bard Lead Lag controller specificaƟons.

d. Is the G circuit intended to independently control the supply-air blower, or should the blower automaƟcally operate whenever heaƟng or cooling is requested? Please Refer to the Bard Lead Lag controller specificaƟons.

e. Are the W, Y, and G control inputs intended to be acƟvated by applying 24 VAC from the R circuit? If available, please provide the applicable control schemaƟc, signal requirements, and contact/current raƟngs. Please Refer to the Bard Lead Lag controller specificaƟons.

f. Is any remote indicaƟon of equipment operaƟng status, faults, or alarms required beyond the idenƟfied six-pin interface? Just the 6 pin interface.

g. Should the HVAC units retain independent local control capability, and, if so, how is control authority expected to transfer between local and remote operaƟon? No, only control through the Bard Lead/Lag controller is expected.

3. Electrical Power DistribuƟon (SOW Requirements 14 and 15) Our understanding is that each set will consist of an A unit and a B unit, with the A unit receiving the primary electrical supply and distribuƟng power to the B unit through a dedicated 50A circuit breaker and output connector.

Please confirm that this interpretaƟon is correct. That is correct.

We would also appreciate clarificaƟon on the following:

a. Are both HVAC units expected to operate simultaneously at their maximum electrical loads?

That is determined by the lead lag controller. The expectaƟon is that one unit will be primary and the other unit will only supplement in high heat environments.

b. Is simultaneous compressor startup required, or would a brief, automaƟc startup delay between the A and B units be acceptable? That is not expected, refer to the controller’s operaƟons manual for expected startup operaƟons.

c. Is there an exisƟng power-distribuƟon schemaƟc or electrical interface drawing available showing the intended A/B arrangement?

d. Are there specific requirements for the disconnect panel, circuit breakers, short-circuit current raƟng, or electrical cerƟficaƟon/lisƟng beyond those idenƟfied in the SOW? – No

4. Stackable TransportaƟon Frames (SOW Requirements 5–10) We understand that each HVAC unit requires a removable metal transportaƟon frame capable of supporƟng another framed HVAC unit.

To properly evaluate this requirement, please clarify:

a. Are the units intended to remain stacked during operaƟon, or is stacking required only for transportaƟon and storage? Stacked only during transportaƟon and storage.

b. What transportaƟon methods are anƟcipated (highway, military air transport, commercial air cargo, etc.)? Currently shipping in a mulƟmodal container by either highway or ocean vessel, future may include air cargo or rail.

c. Are there established requirements for shock, vibraƟon, restraint, Ɵe-down provisions, or structural loading? – No

d. Is there an overall height or dimensional restricƟon for the stacked configuraƟon?

e. Are exisƟng frame drawings, photographs, or examples available to illustrate the intended configuraƟon? See above. The units are expected to be shipped and stored in High Cube Iso Shipping container.

5. Duct ConnecƟons and Condensate Drain (SOW Requirements 11–13) The SOW specifies 16-inch flexible duct connecƟons secured with band clamps, along with a condensate drain suitable for an external tube connecƟon.

Are there exisƟng ducƟng arrangements, maƟng components, or condensate-drain connecƟon dimensions that the proposed units must accommodate?

- ExisƟng 16 Flexible ducts that connect the units to the trailer

- No specific condensate draing connecƟon

If available, drawings or photographs would be helpful.

- See above

6. General Requirements

Finally, please advise whether there are addiƟonal performance, environmental, tesƟng, inspecƟon, or acceptance requirements applicable to this procurement beyond those idenƟfied in the supplied SOW.