B100 Eng shop HVAC Questions and Answers.docx

Bldg 100 Engine Shop HVAC Replacement Project 2/5/2021 Questions Submitted & Answers Question 1. Is the contractor responsible for evaluating changes needed to the sprinkler system due to dropping of the units below the ceiling and making those changes as part of the project?

Answer 1. No. This contract does not call for this new HVAC equipment to be connected to the Siemens Building Automation system.

The Contractor shall install an independent 24 volt thermostat to control the new HVAC equipment.

Question 2. Does the closed loop system contain glycol?

Answer 2. No, this system is filled with water only. This contract does not include glycol. this duct mounted duct detector will not be connected to the building fire alarm panel. The Contractor shall install a duct mounted type smoke detector, which upon detection of smoke, will simply shut down the HVAC unit.

Question 3. Paragraph 4 states that work will be complete within 30 calendar days after submittal acceptance. This may not be possible with equipment lead times as they are at present.

Answer 3. The USCG understands the challenges by Contractors to obtain equipment and materials from manufacturers during the Covid-19 pandemic. Time extensions for this project completion will be allowed with appropriate documentation from the equipment supplier.

Question 4. What are the breaker sizes of the 2 existing units?

Answer 4. HP-2: The electrical breaker size is 20amps, 3 pole, 480 volts & is circuit breaker number 2 in Panel labeled PPC.

HP-3: The electrical breaker size is 20amps, 3 pole, 480 volts & is circuit breaker number 3 in Panel labeled PPC.

Question 5. Where can the condensate drains go out of the building? Can the drains go outside at the closest wall with no restrictions or should we plan for condensate pumps?

Answer 5. The condensate drains for each unit can go through the closest exterior wall. This is covered in the Scope of Work under Technical Requirements, General Section, bullet 5, located on page 4.

Question 6. Can we use the “Pro Press” system for the condenser water and condensate? It would alleviate us having to use a torch is the area?

Answer 6. Yes, the “Pro Press” pipe fitting system is approved to be used on the water and condensate piping for this project.

Bldg 100 Engine Shop HVAC Replacement Project 2/5/2021 Questions Submitted & Answers Question 7. Are the existing controls connected to Siemens DDC system? If so, does the Coast Guard want to give us a line item for Siemen’s expense to wire the new systems or will that be handled outside of this contract?

Answer 7. No. This contract does not require for this new HVAC equipment to be connected to the Siemens Building Automation system.

The Contractor shall install an independent 24 volt thermostat to control the new HVAC equipment.

Question 8 Are we to include TAB?

Answer 8. The Contractor is not required in this project to provide TAB (Testing and Balancing) of the air flow.

Question 9. SOW asks for 5-ton units. N C code will require these units to have smoke detectors. I don’t see a provision in the scope for smoke detectors. And, is there an alarm system or just a system shut down to consider?

Answer 9. The Contractor shall install a duct mounted type smoke detector, which upon detection of smoke, will simply shut down the HVAC unit.

The Contractor is not required to connect the duct mounted duct detector to the building fire alarm panel.