Note: Please note receipt of all addenda on your bid form. Page 1 of 3 WESTERN CONNECTICUT STATE UNIVERSITY ADDENDUM NO. 3 TO GRASSO RESIDENCE HALL HVAC IMPROVEMENTS/UNIT REPLACEMENT BID NO. 2019-MRC-0014 DATE: APRIL 18, 2019 The following addendum will expand, amend, revise and clarify the specifications bearing the above title, dated February 22, 2019, and will become a part of them – not replace them. All information in the original contract documents still apply unless specifically omitted or revised by the addendum. Below is a list of RFI’s received, along with the subsequent responses submitted by Kohler Ronan LLC, the consultant-of-record for this project. HV-1 Controls: 1.) DWG: M002 shows an existing duct mounted damper in the supply air. Our records do not show that this damper exists today. Can confirm if this damper is existing to be re-used? KR Response: Damper does not exist. Refer to revised Flow and Control Diagram 2/M002. 2.) DWG: M002 shows an existing duct mounted damper in the supply air. Since this unit serves multiple floors, is it necessary to have a supply air damper at each floor? Does this damper need to be a smoke damper? KR Response: Refer to revised Flow and Control Diagram 2/M002. Dampers are not required 3.) DWG: M002 shows new temperature, humidity and static pressure sensors on the Outdoor air. Are these sensors necessary for this system? KR Response: Provide sensors as indicated on drawings. 4.) DWG: M002 shows new Air Flow Measuring Stations (F) in the supply air. Are these Air Flow Measuring Stations necessary for this system? KR Response: Provide sensors as indicated on drawings. 5.) DWG: M002 shows a new Outdoor Air-Cooled Condensing Unit. Is there an existing underground conduit dedicated for control wires today? If not, someone will need to provide trenching and conduit from building to Outdoor Air-Cooled Condensing Unit location for control wiring. KR Response: There is no existing conduit. No trenching is required. Route control wiring/conduit along same path as electrical conduit and mechanical refrigerant piping to condensing unit. Coordinate with mechanical and electrical contractors.
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WESTERN CONNECTICUT STATE UNIVERSITY ......MD300 3 M301 1 M300 3 PROPOSED PATH FROM ACCU-1 TO HV-1. ALL PIPING RUNNING THROUGH FINISHED SPACES SHALL BE CONCEALED AND ABOVE FINISHED
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Note: Please note receipt of all addenda on your bid form.
Page 1 of 3
WESTERN CONNECTICUT STATE UNIVERSITY
ADDENDUM NO. 3 TO
GRASSO RESIDENCE HALL HVAC IMPROVEMENTS/UNIT REPLACEMENT BID NO. 2019-MRC-0014
DATE: APRIL 18, 2019
The following addendum will expand, amend, revise and clarify the specifications bearing the above title, dated February 22, 2019, and will become a part of them – not replace them. All information in the original contract documents still apply unless specifically omitted or revised by the addendum. Below is a list of RFI’s received, along with the subsequent responses submitted by Kohler Ronan LLC, the consultant-of-record for this project.
HV-1 Controls:
1.) DWG: M002 shows an existing duct mounted damper in the supply air. Our records do not show that this damper exists today. Can confirm if this damper is existing to be re-used?
KR Response: Damper does not exist. Refer to revised Flow and Control Diagram 2/M002.
2.) DWG: M002 shows an existing duct mounted damper in the supply air. Since this unit serves multiple floors, is it necessary to have a supply air damper at each floor? Does this damper need to be a smoke damper?
KR Response: Refer to revised Flow and Control Diagram 2/M002. Dampers are not required
3.) DWG: M002 shows new temperature, humidity and static pressure sensors on the Outdoor air. Are these sensors necessary for this system?
KR Response: Provide sensors as indicated on drawings.
4.) DWG: M002 shows new Air Flow Measuring Stations (F) in the supply air. Are these Air Flow Measuring Stations necessary for this system?
KR Response: Provide sensors as indicated on drawings.
5.) DWG: M002 shows a new Outdoor Air-Cooled Condensing Unit. Is there an existing underground conduit dedicated for control wires today? If not, someone will need to provide trenching and conduit from building to Outdoor Air-Cooled Condensing Unit location for control wiring.
KR Response: There is no existing conduit. No trenching is required. Route control wiring/conduit along same path as electrical conduit and mechanical refrigerant piping to condensing unit. Coordinate with mechanical and electrical contractors.
Note: Please note receipt of all addenda on your bid form.
Page 2 of 3
AC-1 Controls:
1.) DWG: M002 shows an existing duct mounted damper in the supply air. Our records do not show that this damper exists today. Can confirm if this damper is existing to be re-used?
KR Response: Flow and control diagram 1/M002 does not indicate a supply damper.
2.) DWG: M002 shows an existing duct mounted damper in return air. Our records do not show that this damper exists today. Can WCSU confirm if this damper is existing to be reused?
KR Response: Flow and control diagram 1/M002 does not indicate a return damper. The Existing outdoor air damper shall remain functioning.
3.) DWG: M002 shows new temperature, humidity and static pressure sensors on the Outdoor air. Are these sensors necessary for this system?
KR Response: Provide sensors as indicated on drawings.
4.) DWG: M002 shows new Air Flow Measuring Stations (F) in both the return air and supply air. Are these Air Flow Measuring Stations necessary for this system?
KR Response: Provide sensors as indicated on drawings.
5.) The existing controls for AC-1 utilizes return air CO2 control. Is this a requirement in the new design?
KR Response: All existing sequence of operations shall be maintained. Provide all sensors and integration as required.
CCC-1 – Cooling Tower Controls:
1.) DWG: M002 shows a new Cooling Tower located away from the building. Is there an existing underground conduit dedicated for control wires today? If not, someone will need to provide trenching and conduit from building to Cooling Tower location for control wiring.
KR Response: Our current understanding is there is an existing underground conduit for control wiring, which shall be re-used.
2.) DWG: M002 shows a new VFD associated with the cooling tower. Where will this VFD be located? Is there an existing underground conduit dedicated for control wires today? If not, someone will need to provide trenching and conduit from building to Cooling Tower location for control wiring.
KR Response: See response above regarding conduit. Refer to 3/M301 for VFD-1 location.
Note: Please note receipt of all addenda on your bid form.
Page 3 of 3
List of “Drawings Addendum #1” Plans as part of this addendum:
E-301 Condensing Unit Plan – Electrical
M-002 Flow and Control Diagrams – Mechanical
M-003 First Floor Key Plan – Mechanical
M-600 Details – Mechanical
M-603 Details – Mechanical
MD-301 Cooling Tower Demolition Plan - Mechanical
END OF ADDENDUM
MAIN SERVICESWITCHBOARD (ETR)
CORE DRILLTHROUGH EXISTINGBUILDING WALL
FOLLOWMECHANICAL PIPINGROUTE UNTIL THISPOINT AND BRANCHOFF
CORE DRILLTHROUGH EXISTINGBUILDING WALL
1
2
ACCU-1
ROUTE CONDUITTIGHT TO CEILING
GFI
WP
EXISTINGPANELBOARD (ETR)
PULLBOX
3
MAIN ELECTRICROOM
ROUTE ALONG WITH ACCU-1FEEDER TO MAIN ELECTRICROOM
CONDUIT SHALL BE CONCEALED AND LOCATED ABOVE FINISHED CEILING. ROUTECONDUIT ALONGSIDE NEW MECHANICAL REFRIGERATION PIPING.
PATCH CEILING TO MATCH EXISTING CONDITIONS.
PROVIDE 3#12+G IN 3/4"C FROM EXISTING PANELBOARD LOCATED IN EXISTINGELECTRICAL ROOM. CONNECT TO SPARE 20A-1P CIRCUIT BREAKER