19GE5021R0011 Q and A.pdf

CMR HVAC/Plumbing Renovation US Embassy Zagreb

Solicitation Number 19GE5021R0011

Questions and Answers

Figure 1. Basement

Q1: Is the installation of new chimney included in the project?

A1: Please refer to the document, “J.1.6 Zagreb_CMR_HVAC_HVAC_TECHNICAL_DESCRIPTION_05_2020”, page 24, 2.2 NEW DESIGN A) HEATING SYSTEM.

Q2: Wall structure in the basement – Is it concrete or brick?

A2: Underground walls are mostly made out of concrete. Above ground walls are mostly made out of brick..

Q3: Is there a requirement to replace ventilation ducts in the basement/ furnace room and in the room with water thanks?

A3: No.

Figure 2. Kitchen

Q4: Is stove hood controller included in the project?

A4: Refer to the documents, “J.1.6 Zagreb_CMR_HVAC_HVAC_TECHNICAL_DESCRIPTION_05_2020”, page

32, and “J.1.7 Zagreb_CMR_HVAC_HVAC-BILL OF QUANTITIES”, sheet

“Automatic Control” - Kitchen exhaust system - OK2.

Q5: Is replacement of the kitchen tiles included in the project?

A5: Only wall tiles are included. Refer to drawing A105.

Q6: Radiators covers – Do they need to be removed and disposed?

A6: No. The Government will remove the covers and store them in the attic for possible installation in the future.

Figure 4. Attic Stairwell

Q7: The vertical heating pipes that run through the stairway towards the attic towards the

AHU heater – Do they need to be inserted into the wall?

A7: No. Refer to drawing M1.018.

Q8: Is replacement of the AHU evaporator in the scope of project?

A8: No. Refer to the document

“J.1.6 Zagreb_CMR_HVAC_HVAC_TECHNICAL_DESCRIPTION_05_2020”, page

29.

Q9: What is the model of the existing AHU?

A9: Refer to the document, 22 and drawing M1.011.

Figure 3. Attic Stairwell

Figure 5. Exterior

Q10: What is the location of the foundation for new VRF unit?

A10: Refer to the drawing M1.009.

Q11: How good does the touch-up (finish) need to be on the outside wall when A/C units will be removed?

A11: The finish needs to be as good as possible. Once the façade is later painted (outside of scope), there should be no obvious traces that equipment was there.

Q12: Outside plastic conduits for refrigerant piping to the Attic - Do they need to be in the wall?

A12: Refer to the document, 30.

Q13: Is the contractor responsible for moving valuable existing furniture and artworks? If so, is there a safe place for these objects or do we have to provide a container with padlock?

A13: The Government will take care of all artwork and move it out of the way. According to section A.II.1. of J.1.1 Zagreb_CMR_HVAC_A_BILL_OF_QUANTITIES, the contractor is responsible for moving furniture items out of the way and protecting them.

Other than kitchen cabinets and equipment, the Government does not expect that extensive furniture relocation will be necessary.

Q14: Will gutters and downspouts be replaced?

A14: Refer to the construction drawings CMR P102 and P304.

Q15: Will there be any paint or repair works on façade?

A15: The Contractor will remove some equipment that is currently suspended on the façade.

This will inevitably result in some holes and other damages. The contractor shall patch the damages and make them as little visible as possible. However, painting of the façade is not included in the scope of this project and will be completed by others.

Q16: Could you please provide the excavation level of existing pipes at under slab?

A16: The Government does not have drawings showing the depth of the current storm drain or sanitary drain pipes. In addition, note that the pipe denoted as NEW PVC diameter 160 in coordinates D7 of the drawing CMR P304 will remain in place as it was recently replaced.

Q17: Is it possible to be flexible in scheduled dates according to the lead times from material suppliers? The delivery times of some materials can be longer than scheduled times.

Especially for the HVAC and AHU.

A17: Please provide the exact lead times of all equipment in the proposal and the Government will consider the adjustment to the schedule if properly justified.

Q18: Can the copper pipes of heating system be replaced with black steel pipes? That can be reduce the installation and operating costs.

A18: No, please use copper pipes per standard BS EN 1057, connected using press fittings such as Viega Profipress, or similar.

Q19: Furniture inside building which is impossible to move in the center of room we are moving to some warehouse to store or this is on your staff (storage until re-location)?

A19: See A13 (above).

Q20: Confirm that the waste has been disposed of is given at the handover of the facility?

A20: Keep the records of all trash disposal on the site, available for review.

Q21: Ceramic tiles – RAL color is the same as current ones? In architectural project designer specified FLORIM in grey color – this brand is mandatory or not?

A21: Currently, the specified tiles are the only one approved. However, the contractor may submit another kind of tiles for approval.

Q22: Carpets - RAL color is the same as current ones?

A22: Carpets are outside the scope of this contract.

Q23: Project of performed condition – how many copies, drawings in dwg or pdf, on a CD?

A23: Provide three copies of As-built drawings in hard and soft format.

Q24: Heating / plumbing – shall the Contractor use designed steel and copper pipes (welding) or a press pipes with fittings (on site visit we get that info which is not yet confirmed)?

A24: See A18.

Q25: AHU – HE stays current or will it be replaced? If the current one stays, capacity will be changed according to new gas, R410a instead R407C.

A25: As per drawing CMR M1.005, the evaporator will not be changed.

Q26: Refrigerant piping for new outdoor units (VRV and for AHU) – vertical one will be guided in the existing plastic channel placed on the exterior wall; we didn’t see such channel during site visit. Can you supply us with picture of location of that channel?

A26: Refer to page 23 of J.1.6 HVAC_TECHNICAL_DESCRIPTION_05_2020.pdf. The existing PVC channel (Panduit) will remain in place.

Q27: According to the site visit, 2 pcs of AC units will remain on site – we need exact type/model of units because they also need to be connected to CCCS. Because they stay on current location, there is need to install additional cards for possibility of working in

KNX system. In solicitation, C.2- Statement of work, C.2.2 General, chapter C.2.1.15 is indicated: Provide wireless temperature control for the radiators and the VRF systems

A27: The design calls for the removal of all existing split pack AC units and installation of two new sets. Refer to the notes in the drawing M1.006 and

J.1.1 Zagreb_CMR_HVAC_HVAC-BILL OF QUANTITIES, VENTILATION_AC, section 3.13.

Q28: According to which standards will be made all installations, according to American or

Croatian standards, because project documentation says that contractor must adhere to

American standards as well as the standards of the country in which the works are performed, in this case Croatian standards?

A28: In case there is a conflict between the standards, the local standard shall prevail.

Q29: In the HVAC plumbing bill of quantities it is specified to replace vertical rainwater drainage pipes. In solicitation, C.2- Statement of work, C.2.2 General, chapter C.2.1.12 is indicated that Contractor shall evaluate and replace if necessary, all roof drainage piping and system. In the cost estimate (HVAC plumbing bill of quantities) this is not stated so the question is whether everything is changing or not?

A29: Refer to the construction drawing CMR P102 and P304.

End of list