B08_Attachment_7-Q_As_0001.pdf
PDF 2 MB Posted
- Attached to
- DEVA - HVAC REPLACEMENTS Federal contract opportunity
- Solicitation number
- 140P8525R0006
About this file
This document is a detailed Questions and Answers (Q&A) document for a Death Valley National Park (DEVA) HVAC and Evaporative Cooler Replacements contract (Solicitation 140P8525R0006). The document covers technical specifications and clarifications for equipment replacement, including air handler dimensions, SEER2 rating requirements, refrigerant considerations, and boiler system details. Key points include a minimum SEER2 rating of 15.2, compliance with LEED Silver standards, replacement of existing heating systems with electric alternatives, and specific constraints such as no propane usage and the requirement to install equipment inside buildings. The project falls under the Davis-Bacon Act Wage Determination CA20250020 Rev. 11 and involves replacing existing HVAC components in multiple locations within Death Valley National Park.
The Q&A addresses multiple technical specifics, such as the dimensions of an air handler in 10 Old Ghost, the need for a third interior head for a mini-split system, and details about existing boiler systems. The government will furnish some materials and expects contractors to provide a 1-year construction warranty. The replacement system will include a 10-ton heat pump boiler and a 20 kW electric boiler, with emphasis on energy efficiency and system compatibility. The project requires careful consideration of installation constraints, including maintaining historical facility integrity and ensuring all components are installed within the building.
View the file
Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| Sol_140P8525R0006_Amd_0001.pdf | ||
| Sol_140P8525R0006.pdf | ||
| B08-_Attachment_2-Statement_of_Work_Division_02.pdf | ||
| B08-_Attachment_6-_Construction_Contract_Administration.pdf | ||
| B08-_Attachment_3-_Contract_Price_Schedule.xlsx | XLSX spreadsheet | |
| B08-_Attachment_5-Limitation_on_Subcontracting_Report_Template.xlsx | XLSX spreadsheet | |
| B08-_Attachment_1-Statement_of_Work_Division_01.pdf | ||
| B08-_Attachment_4-_DBA_WD_CA20250020_Rev_11.pdf |
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Text version
Death Valley National Park (DEVA) HVAC and Evaporative Cooler Replacements 140P8525R0006
1. Dimensions for the air handler in 10 Old Ghost as it was not available to tour?
The air handler is approximately 49 inches tall, 26 inches deep, and 20 inches wide, see photos.
2. is there a minimum acceptable SEER2 rating on the proposed equipment?
SEER2 shall be not less than 15.2. SEER2 ratings below 16 shall include additional energy conservation measures.
The National Park Service designs to the Leadership in Energy and Environmental Design (LEED) Silver standard. LEED Silver does not have a direct Seasonal Energy Efficiency Ratio 2 (SEER2) requirement, however 15.2 is generally accepted as the minimum possible SEER2 rating to achieve a LEED Silver rating when additional energy conservation measures are included in the design.
3. The requested 3rd interior head on 323 Old Ghost- the installed system is R410 refrigerant, as that is no longer available to purchase, can the government provide that unit from park stock and the contract scope would be to install it?
Yes, the Government can furnish this material. However, the Contractor shall honor the 1-year construction warranty on any Government-furnished material as if it was contractor-provided. The Contractor may alternatively propose a new independent mini-split if a compatible head cannot be procured.
4. In the bid instructions is says “Install (1) 10 ton heat pump boiler and (1) 20 kw electric boiler.” Is the existing Boiler a heat pump or gas heat system? Also 20kw sound like a water heater?
See Attachment 8 - Cutsheet for the existing boiler, a Lochinvar Knight XL KBX0500N. It typically ran at about 18% (if memory serves) to keep the buildings heated. The current configuration uses a pump to pull the working fluid from the main supply and return circuit into the boiler when running. Please keep in mind that the entire system must be installed inside the building. This includes the compressor-side of any heat pump system.
5. Would it be possible to get the data tags of the existing piece of equipment?
See Photos below
6. Is this a PW Job?
This project falls under the DBA Wage Determination CA20250020 Rev. 11 (Attachment 4)
7. A heat pump version will require some source to “absorb heat” without an outdoor unit that will be difficult to accomplish especially having a rating of 500,000 BTUs.
Is it possible to stick with a gas fired system like the one that is currently there?
The exterior wall of the boiler room and the adjoining mechanical room is louvers for make-up air. Venting through those may be a possible source of heat. The notion of two different units is to have redundancy on the few days a year when the heat source is too cold.
While the current boiler is 500,000 BTU, it typically only runs at about 18% (or less), or around 100,000 BTUs (or less). A 10-ton unit, as called out at 01 27 00 - 11 paragraph M.3 in the specifications is about 120,000 BTU. This means that a 10-ton unit is still probably over-sized for the space. The 20 kW, 68,000 BTU, traditional electric boiler is probably sufficient to heat the entire facility, but as stated above, is really for resiliency, so it slightly under-sized.
Propane is not an option. The reason we are removing the current boiler is that the propane lines have failed. Replacing the propane system is anticipated to exceed the cost of changing to an electric boiler and will take 2 to 3 years to complete compliance because the facility is historic.
8. Would you happen to have access to the data for the “20kw boiler”?
Pictures of the boiler are attached below.
The boiler from the front and the data plate, the circulating pump and its data plate, and the line probe that turns the boiler on and off.
When the temperature in the line drops, the circulating pump at the boiler turns on and pulls the working fluid through the boiler. Main circulation is via larger pumps in the other mechanical room controlled by VFDs. As a note, the BMS in the facility has failed, which is why the boiler is controlled by a line probe.
9. Is the second “boiler” a water heater?
The second boiler is not a water heater.
10. Do we need to replace the controller and the pump as well or can these be reused?
Reuse of the controller and pump would be at your discretion; your company must warranty that it all works.
11. Are we ok to move forward with a gas replacement
No gas/propane.
File details come from the government source that posted it. Updated .