Questions and Answers 2 consolidated.docx

Questions and Answers 2

Q1: Specifically, section 01 10 00 (which was in the original specs but this revision appears to have more content) leads to some questions and appears to have added sections, like Section 1.16. Where in Part D.13 says equipment duct cleaning is required for units operated during construction. Is this only speaking to the newly installed cassette units or does this include AHU 3 which will technically be in operation serving that room as well.

A1: Paragraph 1.16 subparagraph D 13 is directing contractors to “clean up after their work’. It is not expected to require any duct cleaning as long as the contractors act protect the air handling system from dust/debris. These actions would include, but, not be limited to blocking intakes and returns with construction plastic or shutting down air handlers during activities and clean up.

Will there be an opening for additional questions? Can you at minimum clarify that one? If it does include AHU 3 or parts of, that is an added cost. Just not sure the line of delineation of that comment. Time was provided for additional questions.

Q2: The specified condensate pumps will be hardwired, will a disconnect switch be required for each condensate pump?

Condensate pumps (external, secondary) should remain plug in, with installation of recepticals at each pump location. The condensate pumps will be powered by a new circuit installed from circuit #42 in panel BL1. This circuit will be 20 amps with 2#12 and 1 #12 ground in a shared 1.5” conduit shared with the feed for the outdoor unit. Provided junction boxes as required.

Q3: Per manufacturers submittals, the indoor units require a dedicated single-phase breaker and circuit. Drawing j-3 keynote 2 it specifies the indoor units to be powered by outdoor unit.

A3: The outdoor unit will be powered from a 3-phase circuit as shown on the drawings with the following supplemental information.

1. Relocate ckt #32 (currently serving receptacles rm #146) to space at ckt #40 location and update panel schedule and receptacle labels in room 146 (receptacles in room 146 will now be served by ckt#40)

2. Provide 40A,3p 208V breaker in spaces for ckt #28,30,32 to feed 6-Ton heat pump outdoor HVAC unit. Install 3#6+1#8G in 1.5”C The indoor units will be fed as follows:

1. Feed will be from panel BL2. Relocate branch ckt#34 (currently serving receptacles in rm 142B ) to ckt #3 in order to free ckt # 34. Update panel schedule and receptacle labels in room 142B.

2. Provide 15A, 2P, 208v breaker in spaces ckt #34,36 for 3 indoor units. Install 2#12+1#12G in 3/4”C) Provided disconnects as required in diagram below(Manual Motor Starter, NEMA 1, 2 P, 1 Phase, Toggle, 16 A Square D Mfr # 2510FG2P). Contractor to update panel schedule accordingly.

Q4: Will the condensate pumps require an independent circuit? The condensate submittals require independent circuits.

A4: All condensate pumps may be on a single 20-amp circuit. Panel BL1 circuit 42 will be source for the condensate pump power. See answer 2 for additional information.

Q5: I received the specs for the equipment that was sent out yesterday. They are currently for R410A unit – shouldn’t it be R454? You can only install R410a units if they were manufactured prior to 1/1/26.

A5: As clarification, the basis of design was based on a unit with R410a. The FAA will consider equivalents using other refrigerants from the basis of design manufacturer or other manufacturers that have the same or better salient features.

The original design was created before the refrigerant transition on 1/1/2026. The intent was to offer a basis of design, the R410a unit. This would also provide for the facility to only utilize one refrigerant for all systems. However, the FAA will consider equivalents (giving preference to the basis of design manufacturer).

Q6 Does the existing panelboard has the capacity and space to allow the new circuit or is expected to conduct and upgrade?

A6: The existing panelboards have the capacity for all circuits. See answers to questions 2 and 3 for additional information.

Q7: Could you please confirm Project duration and expected NTP?

A7: Project duration is expected to be approximately 90 calendar days to include submittal approval and lead times. NTP for on-site work will be issued once equipment delivery date is determined with on-site work not to exceed 30 days. The expected NTP will be after award to allow for ordering equipment.

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