ASHRAE Journal - September 2014 - 67
1. Level 1: The user will have read-only access to certain
systems.
2. Level 2: The user will have access to Level 1 as well as
access to scheduling of systems within their care.
3. Level 3: The user will have access Levels 1-2 as well as
access to changing values or overriding systems within
their care.
4. Level 4: The user will have access to Levels 1-3 as well
access to programming tools for certain systems within
their care.
5. Level 5: The User will have access to Levels 1-4 as
well as user creation, modification, and audit trail
management.
Two Is One and One Is Immediate Jeopardy
I'm sorry but the question was: "What is five years of jail time and $1
million?"
I will forewarn you. I know engineers are analytical,
and this section deals with a lot of "what if's," so don't
get discouraged if you don't get a cut and dried answer.
If buildings were cut and dry, we could outsource all our
design needs, and you wouldn't be reading this right
now.
If you are aware of issues in your design and you do not
adequately research and include precautions around
these issues, you are guilty of not exercising due diligence in your design. Now, if you adequately design a system, and the client does not follow your design, you are
off the hook because the client is not executing due care.
This is an important distinction to make because it
clearly helps the design engineer understand where his
responsibilities lie. The goal of your specification is to
ensure that a system is built with business continuity in
mind.
If you are designing a large tonnage plant for a fabrication plant or CDC facility, it behooves you to have redundancy in your design. N+1 is usually a requirement.
But what about a 200-bed hospital? What about a
20-story commercial office building? Do you need
N+1 redundancy of the control system? Some would
say no. It's too expensive, and clients don't need that
in their building. Why? Why is it too expensive? How
much does it cost your client if a supervisory controller fails, and the chilled water system will not run due
to inter-controller sequencing?
Obviously, there needs to be balance. Which buildings get the N+1 approach then? The general rule is if
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SEPTEM BER 2014
ashrae.org
ASHRAE JOURNAL
67
ASHRAE Journal - September 2014
Table of Contents for the Digital Edition of ASHRAE Journal - September 2014
Contents
ASHRAE Journal - September 2014 - Cover1
ASHRAE Journal - September 2014 - Cover2
ASHRAE Journal - September 2014 - 1
ASHRAE Journal - September 2014 - 2
ASHRAE Journal - September 2014 - Contents
ASHRAE Journal - September 2014 - 4
ASHRAE Journal - September 2014 - 5
ASHRAE Journal - September 2014 - 6
ASHRAE Journal - September 2014 - 7
ASHRAE Journal - September 2014 - 8
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ASHRAE Journal - September 2014 - 28
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ASHRAE Journal - September 2014 - 72
ASHRAE Journal - September 2014 - SCover1
ASHRAE Journal - September 2014 - SCover2
ASHRAE Journal - September 2014 - S1
ASHRAE Journal - September 2014 - S2
ASHRAE Journal - September 2014 - S3
ASHRAE Journal - September 2014 - S4
ASHRAE Journal - September 2014 - S5
ASHRAE Journal - September 2014 - S6
ASHRAE Journal - September 2014 - S7
ASHRAE Journal - September 2014 - S8
ASHRAE Journal - September 2014 - S9
ASHRAE Journal - September 2014 - S10
ASHRAE Journal - September 2014 - S11
ASHRAE Journal - September 2014 - S12
ASHRAE Journal - September 2014 - S13
ASHRAE Journal - September 2014 - S14
ASHRAE Journal - September 2014 - S15
ASHRAE Journal - September 2014 - S16
ASHRAE Journal - September 2014 - S17
ASHRAE Journal - September 2014 - S18
ASHRAE Journal - September 2014 - S19
ASHRAE Journal - September 2014 - S20
ASHRAE Journal - September 2014 - S21
ASHRAE Journal - September 2014 - S22
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ASHRAE Journal - September 2014 - Cover3
ASHRAE Journal - September 2014 - Cover4
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