Chapter hvac engineering Fundamentals: Part 1 Introduction



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HVAC HANDBOOK

411
Chapter
13
Design Documentation:
Drawings and Specifications
13.1
Introduction
Design documents evolve from and include the designer’s calculations,
equipment selections, and sketches and are usually presented through
formal drawings and specifications. These construction documents are
the legal means by which the designer conveys the owner’s expecta-
tions to the contractor. The importance of good documentation cannot
be overemphasized.
An old adage says, ‘‘A picture is worth a thousand words.’’ In con-
struction, drawings are the picture, and specifications are the thou-
sand words. But for projects of importance or great value where the
work is accomplished by contract between owner and builder, it is
important that there be good specifications in addition to the drawings
to define the relationships between the parties. The purpose of this
chapter is to review the nature of contracts and then to define drawing
preparation and specification organization and writing well enough
that the reader will have an understanding of and be prepared to
practice the basic techniques of document preparation.
Since drawings and specifications become a part of a construction
contract, they become legal documents. As such, they must define the
work to be done clearly, completely, and unambiguously. Although this
ideal is seldom achieved, designers must do their best to meet these
criteria. Lawsuits involving millions of dollars have been filed based
on the interpretation of a few sentences in the specifications or a lack
of clear detail on the drawings.
At the same time as contract documents are identified as being of
paramount importance to the relationship between owner and con-
Source: HVAC Systems Design Handbook
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright © 2004 The McGraw-Hill Companies. All rights reserved.
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