Request For Information RFI-12J1998-0291

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
[email protected]
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