GH Phipps Construction Co. 5995 Greenwood Plaza Blvd. Suite 100 Greenwood Village CO 80111-4710 Request For Information RFI-12J1998-0291 Printed On: Subject: RTU Control Dampers Date: Project: CSU-Animal Science Bldg Renovation & Addition Job: Address: Animal Sciences Colorado State Universit Required: Ft Collins CO 80525 Larimer County Phone: 02/04/2014 Page 1 of 1 02/04/2014 12J1998 02/11/2014 Est.Cost Impact: $ Fax: Est. Days Impact: To: Adam Balaban Bennett Wagner & Grody Architects From: GH Phipps Construction Co. Co-Author: Scott Metz Contact: Co-Author RFI Number: USE-051 Reference: Detail: Drawing: Spec Section: Discipline: Page: All Request Please see the attached email string. There was a discrepancy in the contract drawings in regards to the control dampers on the RTU. Per the attached email from Adam Acree at Cator Ruma, it is acceptable to not install control dampers on the supply and exhaust connections on the RTU and credit back the cost. Please confirm Suggestion Answer Accept Suggestion Confirmed. Please submit the credit for the dampers and associated controls for review. Answered By: Date: Adam Acree Signed: Cator, Ruma & Associates 02/06/2014 Distribution: Subcontractors/Suppliers - Please respond back to GH Phipps Construction Co. within 7 calendar days from date of receipt regarding any cost or schedule impacts that are a result of this RFI. pm3010 RFI Transmittal Bennett Wagner Grody Architects | 1301 Wazee Street Suite 100 Denver, CO 80204 PROJECT: 1207.00 CSU Animal Sciences 1207.00 DATE SENT: 2/4/2014 RETURN BY: 2/11/2014 SUBJECT: RFI-291 RTU Control Dampers RFI ID: RFI-291 TYPE: RFI TRANSMITTAL ID: 01169 PURPOSE: To Answer VIA: Info Exchange QUESTION: SUGGESTION: FROM NAME COMPANY EMAIL PHONE Adam Balaban Bennett Wagner Grody Architects ABalaban@bwgarchitects. com (303) 6237323 NAME COMPANY EMAIL PHONE Stephanie Guillen Cator Ruma & Associates, Co. [email protected] TO DESCRIPTION OF CONTENTS QTY DATED 1 2/4/2014 TITLE NUMBER NOTES RFI-291 RTU Control Dampers.pdf COPIES Adam Acree (Cator Ruma & Associates, Co.) Page 1 of 1 U.S. ENGINEERING CO. P.O. BOX 905 LOVELAND, CO. 80539 (970)669-1666/(970)663-0685(FAX) REQUEST FOR INFORMATION DIRECTED TO: ATTENTION: TITLE: GH Phipps Construction 5995 Greenwood Plaza Blvd. Suite 100 Greenwood Village, CO 801114710 Brian Cass & Scott Metz PROJECT: CSU Animal Sciences SUBMITTED BY: Jason Schneider, PE INITIATION DATE: RESPOND BY: GC U.S.E. RTU Damper Clarification CONTRACT DRAWING. #: SPECIFICATION SECTION: OTHER: DISCIPLINES: MECH. ELECT. STRUCT. ARCH. RFI #: RFI #: 51 OTHER: WRITTEN DESCRIPTION OF PROBLEM (ATTACH SKETCHES AS REQUIRED) Please see the attached email string. There was a discrepancy in the contract drawings in regards to the control dampers on the RTU. Per the attached email from Adam Acree at Cator Ruma, it is acceptable to not install control dampers on the supply and exhaust connections on the RTU. A credit to the project will be provided. Please confirm POSSIBLE COST IMPACT: YES NO POSSIBLE TIME IMPACT: YES NO CONTRACTOR'S PROPOSED SOLUTION: ARCHITECT/ENGINEER'S RESPONSE: U S Engineering Confidential 2/3/2014 Page 1 Jason Schneider From: Sent: To: Subject: Adam Acree <[email protected]> Friday, January 31, 2014 11:21 AM Jason Schneider RE: RTU Damper Question Jason, The intent of the dampers on all air streams was to totally isolate the unit if it was shut off. However, since it is a stand-alone unit and we do have the backdraft dampers at all fans, I would be agreeable to not installing the supply and exhaust motorized dampers if you can provide a credit back to the project for the dampers and associated controls. Adam J. Acree, P.E. Sr. Mechanical Engineer Cator, Ruma & Associates, Co. Colorado | Wyoming 896 Tabor Street, Lakewood, CO 80401 P (303) 232-6200 D (303) 462-8479 www.catorruma.com Please consider the environment before printing this email. The information contained in this electronic message should be considered confidential, and is intended solely for the use of the individual or entity to which it is addressed. Copying, dissemination, or disclosure of this information is strictly prohibited without the express permission of the sender. If you are not the intended recipient, please delete this message and notify the sender immediately. Thank you. From: Jason Schneider [mailto:[email protected]] Sent: Friday, January 31, 2014 9:32 AM To: Adam Acree Subject: RTU Damper Question Importance: High Adam, We have come across a discrepancy between the prints, specifications and approved RTU submittals in regards to control damper locations. The TC drawings show control dampers on the OA, EA & SA. 1 2 The mechanical RTU details only show control dampers on the OA. 4 Specifications call for control dampers on the SA, EA, RA & OA Approved RTU submittal only has control dampers on the OA. Gravity backdraft dampers were provided for the SA & EA. I have attached the JCI sequence of operations and RTU diagram. Given the SA sequence of operations, I don’t see the SA damper as necessary. The exhaust air discharge is also protected by backdraft dampers at the fans so I don’t see the need for a control damper at this location. Any dampers that are added at this point will need to be either duct mounted or mounted to the face of the RTU connection. Please review and let me know your thoughts. We need to get the TC low voltage contractor an answer as soon as possible so please review soon. Thanks Jason Schneider, P.E. Project Manager U.S. Engineering Company [email protected] Mobile: 303-435-7017 – Primary Contact Office: 970-669-1666 5