TAB Journal Summer 2020 - 17

"We were instructed to cut the constant volume grilles to almost
nothing to try to build enough static pressure in the system to get the
Phoenix Valves to work."

After reviewing our results, we asked the engineer what
we should do. Several ideas came to mind, but we finally
agreed on a plan: There were constant volume return grilles
connected to the duct mains with the Phoenix Valves. We were
instructed to cut the constant volume grilles to almost nothing
to try to build enough static pressure in the system to get the
Phoenix Valves to work.
We tried this, but found that we still did not have enough
pressure in the systems to get the Phoenix Valves to work.

TAB Journal Summer 2020

The engineers, contractors and owner representatives involved
in the project asked about speeding up the fans. The return
fans were at design volumes and static pressures. They were
all at nameplate amperage and the hospital did not want to run
the drives over 60 Hz.
Despite these results, we were told to speed the fans up to get
more volume.
About this time, we stopped and decided to have a discussion
with the concerned parties about the return systems to explain
- in great detail - what problems we were encountering.

17


http://www.retrotec.com

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
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TAB Journal Summer 2020 - Cover3
TAB Journal Summer 2020 - Cover4
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