Amendment 1 Clarifications.pdf
PDF 293 KB Posted
- Attached to
- ILM HVAC Replacement Federal contract opportunity
- Solicitation number
- 697DCK-22-R-00467
About this file
This document contains clarification questions and answers regarding a solicitation for upgrading the HVAC system at an air traffic control tower and base building in Wilmington, North Carolina. The Federal Aviation Administration is seeking to replace the existing HVAC system with a new direct digital control system integrated with a variable air volume system. Acceptable control products include Ecostruxure hardware manufactured by Schneider Electric, and Belimo three-way control valves are an approved alternate. Bidders should plan to fully control and integrate the defogging system and replace all existing controls. Existing conduit may be re-used when possible but all new wiring must be installed. The final proposal is due by the date specified in the solicitation document.
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Text version
Amendment 1 Q&A Responses/Clarifications:
9/7/22
Please find the most recent DDC Specifications 23 09 23, dated April 2022, which supersedes the Spec requirements in the Solicitation.
1. Specifications – General topology: The specifications are calling for a “LON” topology (FT-
10) which hasn’t been used in the FAA for several years. The newer FAA systems utilize
Ecostruxure hardware (EBO) using Automation Servers (ASP with modules and ASB standalone) type hardware manufactured by Schneider Electric. Keep in mind, the “LON” type controllers by Schneider Electric are being phased out of production with a very limited supply and pricing is significantly higher than the modern EBO hardware.
a. Please provide direction whether or not LON controllers are acceptable for this project.
b. If there is a newer FAA specification for the EBO hardware we can reference, it would be beneficial for pricing purposes.
Please use the modern EBO products. See revised DDC specification.
2. Specification Section L – Control Valves: Energy valves (EV) are called out for all control/Bypass valves. However, the project is calling for 3-way control valves and the EV only come in 2-way control valves. In addition, we do not believe there is enough piping space to accommodate an EV. Keep in mind, the purpose of the EV is for pressure independent / system flow control and it basically defeats the purpose if the complete system is not matched.
a. Please provide direction if any Energy Valves will be required for this project.
b. We propose a 3-way CCV manufactured by Belimo as an industry standard alternate for this application.
Agreed and accepted.
3. Drawing sheet M813 – Cab Defogger: The existing cab defogger system is electronically operated and is not part of the DDC system. The drawings are calling for Binary Inputs to monitor portions of the existing system.
a. Zone status: It is unclear how this is accomplished as there are multiple zones and it is only calling for a single binary input at the console. i. Please advise to the intent of this status indication?
Please include the full DDC integration for the defogging system.
b. Surfactant pump status (Existing pump): this is typically a small enclosed pump that plugs into a 110 vac plug and operates based on flow. As this is something we have not provided status for in the past, what are the acceptable means for status without altering the self enclosed pump enclosure? As the pump is very small, our current sensors can only measure down to a ¼ amp – we cannot say for certain this is low enough to measure the status. We could install a relay but that would require us to open the pump enclosure and circumvent the wiring to trigger a relay. i. Please advise to the best method of gathering status for this device?
CFP status is not required.
c. For clarity, zone control automation (as done in previous ATCT) via the DDC does not appear to be part of the project. Are we to assume this system is in good working condition and no work is required for this system?
The hot/cold deck system is being replaced by a VAV system and will need all new control in the Base Building. The ATCT will have all new controls as well. Please plan to control all zones.
4. Conduit & wiring - DDC: it is unclear if the existing conduit & wiring can be re-used. During our walk through, we noticed conduit ran throughout the facility.
a. Is it acceptable to re-use the existing conduit when possible? Yes.
b. Is your expectation that all new wire be installed? Yes.
File details come from the government source that posted it. Updated .