TAB Journal Summer 2020 - 19

"All valves must remain above minimum springe range at all times,
or the CFM to the grille or equipment will change."

Three return systems could not reach design airflow
requirements and/or keep the Phoenix Valves in spring range
control without over-amping.

*	 System 2 met all new criteria, with some amps to spare.
(7.7 on full load amps of 9.7) The fan could be sped up to
achieve more CFM until the amps reach design.

A temporary solution was found: we were told to reduce the
supply and return min/max CFMs to a constant volume target
CFM. This would be achievable and satisfy minimum air
change per hour requirements. After all parties agreed on this
course of action, we redid the three supply and return systems.
This allowed the hospital to open on time.

*	 System 3 met all new criteria with a tiny amount of
amperage left. The CFM could be increased slightly before
both amps go above the nameplate.

The results for the returns were as follows:
*	 System 1 barely made it, running on the ragged edge and out
of amps.

TAB Journal Summer 2020

We learned that sometimes you need to stop and look at what
is going on with the systems and explain everything to the
concerned parties involved to be able to make a decision and
move forward.
AIA
After reading the full issue, take what you've
Continuing
Education learned, visit www.aabc.com/TABQuiz and
pass the quiz to earn 1 AIA LU.
Provider

19


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TAB Journal Summer 2020

Table of Contents for the Digital Edition of TAB Journal Summer 2020

TAB Journal Summer 2020 - Cover1
TAB Journal Summer 2020 - Cover2
TAB Journal Summer 2020 - 1
TAB Journal Summer 2020 - 2
TAB Journal Summer 2020 - 3
TAB Journal Summer 2020 - 4
TAB Journal Summer 2020 - 5
TAB Journal Summer 2020 - 6
TAB Journal Summer 2020 - 7
TAB Journal Summer 2020 - 8
TAB Journal Summer 2020 - 9
TAB Journal Summer 2020 - 10
TAB Journal Summer 2020 - 11
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TAB Journal Summer 2020 - 13
TAB Journal Summer 2020 - 14
TAB Journal Summer 2020 - 15
TAB Journal Summer 2020 - 16
TAB Journal Summer 2020 - 17
TAB Journal Summer 2020 - 18
TAB Journal Summer 2020 - 19
TAB Journal Summer 2020 - 20
TAB Journal Summer 2020 - Cover3
TAB Journal Summer 2020 - Cover4
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https://www.nxtbook.com/ygsreprints/AABC/tab-journal-winter-2021
https://www.nxtbook.com/ygsreprints/AABC/G122399AABC_Fall2020
https://www.nxtbook.com/ygsreprints/AABC/G120138AABC_Summer2020
https://www.nxtbook.com/ygsreprints/AABC/G118248AABC_Spring2020
https://www.nxtbook.com/ygsreprints/AABC/G116302AABC_Winter2020
https://www.nxtbook.com/ygsreprints/AABC/G114573_AABC_Fall2019
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https://www.nxtbook.com/ygsreprints/AABC/g73432_tab_winter17
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