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TECHNICAL QUESTIONS AND RESPONSE TRACKING SHEET - 36C77622B0030 - EHRM Infrastructure Upgrades Construction DBB – Fargo
| QUESTION # |
| QUESTION RECEIVE |
DATE
QUESTION ANSWERED
DATE
| CONTRACTOR QUESTIONS |
| VA RESPONSES TO QUESTIONS |
| 1 |
| 6.21.22 |
| 6.29.22 |
| Please confirm required Fire Rated Door assemblies needed on the project. All corridor entrances, all other doors? |
| All rated assemblies are as scheduled on Door and Frame Schedule, Sheet A-601, with the exceptions of Door 101 which is to be 45 minutes, Door 3D-10A which is to be 45 minutes, Door 1029 which is to be 0 hour, and Door 1030 which is to be 45 minutes. |
| 2 |
| 6.21.22 |
| 6.29.22 |
| Who is responsible for the wiring and conduit between the inside unit and the outside unit? |
| Division 26 Electrical contractor (EC) is responsible for all power wiring and conduits.. Division 23 Temperature controls contractor (TC) responsible for all low voltage control wiring and conduits below 120V-1PH. |
| 3 |
| 6.21.22 |
| 6.29.22 |
| Detail 3 on M501 shows a thermostatic expansion valve by the indoor unit. Daikin uses an Electronic Expansion Valve located in the outdoor unit. |
| VA til details are used for use to show general DX piping arrangement and additional shut off service valves as requested by Fargo VA. Many refrigerant devices on unitary small tonnage split systems are located internal to indoor and outdoor sections. Typically requiring piping only from component to component. As per notes and specification piping sizing and arrangements are to include all necessary apurtenances per manufactures installation recommendations. |
| 4 |
| 6.21.22 |
| 6.29.22 |
| Detail 3 on M501 shows an equalizer line. Daikin does this in the outdoor unit. |
| VA til details are used for use to show general DX piping arrangement and additional shut off service valves as requested by Fargo VA. Many refrigerant devices on unitary small tonnage split systems are located internal to indoor and outdoor sections. Typically requiring piping only from component to component. As per notes and specification piping sizing and arrangements are to include all necessary apurtenances per manufactures installation recommendations. |
| 5 |
| 6.21.22 |
| 6.29.22 |
| Detail 3 on M501 shows an indoor charging valve. The Charging ports are part of the service valves on the outdoor unit. |
| VA til details are used for use to show general DX piping arrangement and additional shut off service valves as requested by Fargo VA. Many refrigerant devices on unitary small tonnage split systems are located internal to indoor and outdoor sections. Typically requiring piping only from component to component. As per notes and specification piping sizing and arrangements are to include all necessary apurtenances per manufactures installation recommendations. |
| 6 |
| 6.21.22 |
| 6.29.22 |
| Detail 3 on M501 shows an oil trap in the line set. Daikin does not use oil traps. |
| VA til details are used for use to show general DX piping arrangement and additional shut off service valves as requested by Fargo VA. Many refrigerant devices on unitary small tonnage split systems are located internal to indoor and outdoor sections. Typically requiring piping only from component to component. As per notes and specification piping sizing and arrangements are to include all necessary apurtenances per manufactures installation recommendations. |
| 7 |
| 6.21.22 |
| 6.29.22 |
| Detail 3 on M501 shows a sight glass/moisture indicator and strainer in the line set. Daikin does not use these in their line set as they cause to high of a resistance to refrigerant flow. |
| VA til details are used for use to show general DX piping arrangement and additional shut off service valves as requested by Fargo VA. Many refrigerant devices on unitary small tonnage split systems are located internal to indoor and outdoor sections. Typically requiring piping only from component to component. As per notes and specification piping sizing and arrangements are to include all necessary apurtenances per manufactures installation recommendations. |
| 8 |
| 6.21.22 |
| 6.29.22 |
| Detail 2 on M501 has the same items as listed above in 2 thru 6. |
| VA til details are used for use to show general DX piping arrangement and additional shut off service valves as requested by Fargo VA. Many refrigerant devices on unitary small tonnage split systems are located internal to indoor and outdoor sections. Typically requiring piping only from component to component. As per notes and specification piping sizing and arrangements are to include all necessary apurtenances per manufactures installation recommendations. |
| 9 |
| 6.21.22 |
| 6.29.22 |
| Detail 4 on M501 shows a curb with line sets and conduit exiting through the top of the curb. Can we use a curb and box that the line sets and conduit exit on the side? There will be less chance of leakage into the building. The box is usually insulated and has a removable top that is insulated for future service and additional line sets that need to be added. |
| Yes, submit capped curb sumittal with piping penetration detail 24” high minimum height. |
| 10 |
| 6.21.22 |
| 6.29.22 |
| Detail 1 on M502 and Detail 5 on M501 show a roller support and a Unistrut Clamp for the refrigeration piping. Shouldn’t Hydro-Zorb clamps be used for the refrigeration Piping? |
| Hydro- Zorb clamps should be submitted to see if they comply with specifications for mounting on pipe supports preferably stainless steel. |
| 11 |
| 6.21.22 |
| 6.29.22 |
| Should the refrigeration piping that is exposed on the wall by the indoor unit, be in Slim Duct SD-77-1 Refrigeration Enclosure below the ceiling where there is ceilings in these Trac rooms? (See Attached Spec. Sheet for Slim Duct) |
| The Telecommunication rooms are not finished or an occupied space and does require concealed enclosure for piping or conduit. Therefore not required. |
| 12 |
| 6.21.22 |
| 6.29.22 |
| Because the outdoor condensers are grouped together at different locations, this will result in a lot of line sets and conduit in those locations. This will also result in a lot of roof supports in these areas. The problem with this type of installation, is that with this congestion of line sets and conduit, these items usually get damaged by people walking on them or damaged by the weather and being outside. Should we use Market Air’s RD Series Duct Enclosures for Refrigeration Line sets and Conduit on the roof? (See Attached spec sheet Market Air.) |
| This is not a VA specified requirement and would appear to be expensive and labor intensive. |
| 13 |
| 6.21.22 |
| 6.29.22 |
| Can we use Press to Connect fittings on the Refrigeration lines? All Refrigeration Lines for the 30 and 36 sizes of units are 5/8-inch suction and 3/8 liquid. |
| Division 23 Section 23 23 00 Rerfrigerant Piping specification Section has no mention of pressed fitting technology only brazed. Pressed piping is not allowed per VA standards and specifications. |
| 14 |
| 6.21.22 |
| 6.29.22 |
| Daikin in their specs and installation manuals has a maximum line set length of 98.4 feet. If these line sets, the way they are drawn currently, go over that footage, can we change the location of the outdoor unit and the route of the line sets? |
| Locations shall be changed to conform with any manufacturers equipment. Systems shall be installed per manufacturers installation manual requirement standards and recommendations including maximum line set lengths. s. New locations need to be coordinated |
and agreed upon with the COR.
| 15 |
| 6.21.22 |
| 6.29.22 |
| The recorded snow depth on February 28th of this year on the roof was 33 inches. Should we include stands that would mount to the top of the Equipment Rails in Detail 1 on Page M501 to get us up to 36 inches above the roof? |
| ACCUs mounted on 24” high rails shall have a 12” high support stand by manufacture or VA approved equal. This support stand shall be mounted directly to unit and equipment rails to provide 36” below ACCU to roof. This shall be a Diversitech QSMS1201-SS or equal. |
| 16 |
| 6.22.22 |
| 6.29.22 |
| Panel 521W1 – Confirm whether 225A or 400A? |
•Plan E601 panel schedule calls for 225A •Plan EP-52-101 Note 4 calls for 400A Panel and new breaker in DP Panel TQ.
•Plan E705 indicates 400A Panel in one line diagram •Missing Panel Schedule New panel 521W1 is a 400-amp panel.
| 17 |
| 6.22.22 |
| 6.29.22 |
| Panel EBUPS014CA 250A |
•Plan E603 conduit #6 indicates to provide 2ea. 4” 4ea.#500 and 1ea. 1/0. Please confirm correct conduit and wire sizing?
Correct wire size; 4#500, #1G, 3”C.
| 18 |
| 6.22.22 |
| 6.29.22 |
| Are CAD drawing files available for bidding purpose and review? |
| CAD drawings shall be provided to the awardee |
| 19 |
| 6.22.22 |
| 6.29.22 |
| Which division is responsible for low voltage wiring of the CRAC units? Please refer to the table on 23 09 23 – 3 of the project specifications. Item #6 “Computer Room A/C Unit field-mounted controls” and column #4 “Low Voltage Wiring” specifies Division 16. However, division 16 does not appear to exist – is this supposed to be division 26? |
| It shall be 23 23 00 Temperature controls. |
| 20 |
| 6.22.22 |
| 6.29.22 |
| Is the same division also responsible for providing and installing the wire and conduit for the low voltage wiring? |
| Division 26 Electrical contractor (EC) is responsible for all power wiring and conduits.. Division 23 Temperature controls contractor (TC) responsible for all low voltage control wiring and conduits below 120V-1PH. |
| 21 |
| 6.22.22 |
| 6.29.22 |
| Is the same division also responsible for providing & terminating ethernet cable for BACnet IP integration? |
| Yes, for all new duct free split system in this project scope of work . Temperature controls contractor shall provide all necessary devices, wiring, conduits, controls and programming to integrate all HVAC equipment to the existing BAS frontend. For all existing HVAC equipment Temperature controls contractor shall disconect all wiring and cable provided by the Division 27 data Contractor. |
| 22 |
| 6.22.22 |
| 6.29.22 |
| Refer to the project spec section beginning on 23 09 23 – 4 where the document specifies a “Section 23 09 23 contractor” and the “Control system integrator”. Can one control contractor bid and fulfill both of these roles? |
| Yes. |
| 23 |
| 6.22.22 |
| 6.29.22 |
| Please clarify the total number of split system units that will be installed. |
| Please look at equipment schedule and drawings for exact quantities. |
| 24 |
| 6.29.22 |
| 6.29.22 |
| How are the ICRA zones broken down (Example Zone 1 etc.)? |
| We broke the entire campus up into 1 of 4 different ICRA zones, map and ICRA/PCRAs attached. So when a contractor is working in an area the coordinated ICRA class is what they have to work to. The zones are 360° so if they are working on a floor, ceiling, or partition they also need to know what zone they are penetrating into and must follow the rules for the higher of the two zones. Please see attachments that are included with this amendment. |
