TAB Journal Spring 2018 - 17

Proper Strainer Cleaning
Goes a Long Way

Kevin Little, TBE
Flood & Sterling, Inc.

O

n a recent project at a local
medical center, technicians had
been having trouble achieving
the design chilled water flow at one
particular air handler. Once on-site, it
was observed that the unit in question
was one of the first couple units off the
system, and therefore should not be
having trouble meeting setpoint. Another
unit within the same mechanical room
was having no problem meeting setpoint.
In speaking to the maintenance personal
at the medical center, he informed
technicians that the unit had not had any
problems before the summer and couldn't
understand why a unit installed a couple
years prior could be having trouble
meeting the setpoint. All indications led
to the strainer. There were no gauges
installed across the strainer, however, and
the maintenance staff claimed it had been
cleaned several times.
Not wanting to doubt the ability of a 20

year seasoned maintenance man that
is highly respected in the maintenance
department, other scenarios were
considered that could be causing the
problem, though the strainer seemed
most likely.
The maintenance man was asked how
he cleaned the strainer. He indicated that
he connected a hose to the drain "blow
down" as he called it. So now the next
question for him was "So, you didn't pull
the strainer and clean it?" His answer was
"No, we never do, the water coming out
of the hose was running clean."

asking, "Has the strainer been cleaned?"
Don't always assume that it was pulled
and cleaned.
After several weeks, the same
maintenance man called back to indicate
that he had gone around to some of the
other troubled units and cleaned the
strainers the proper way. He wanted to
let us know you're never too old to learn
something new.

Armed with this information, it needed
to be tactfully explained that the proper
method of cleaning a strainer is to pull
the screen from the housing and clean
the entire screen until all openings are
free of debris. The screen from the
strainer was pulled and it was dirty. After
cleaning the strainer and reinstalling it
the unit performed as designed. When

"You're never too old to learn
something new."
TAB Journal Spring 2018

17



Table of Contents for the Digital Edition of TAB Journal Spring 2018

TAB Journal Spring 2018 - Cover1
TAB Journal Spring 2018 - Cover2
TAB Journal Spring 2018 - 1
TAB Journal Spring 2018 - 2
TAB Journal Spring 2018 - 3
TAB Journal Spring 2018 - 4
TAB Journal Spring 2018 - 5
TAB Journal Spring 2018 - 6
TAB Journal Spring 2018 - 7
TAB Journal Spring 2018 - 8
TAB Journal Spring 2018 - 9
TAB Journal Spring 2018 - 10
TAB Journal Spring 2018 - 11
TAB Journal Spring 2018 - 12
TAB Journal Spring 2018 - 13
TAB Journal Spring 2018 - 14
TAB Journal Spring 2018 - 15
TAB Journal Spring 2018 - 16
TAB Journal Spring 2018 - 17
TAB Journal Spring 2018 - 18
TAB Journal Spring 2018 - 19
TAB Journal Spring 2018 - 20
TAB Journal Spring 2018 - Cover3
TAB Journal Spring 2018 - Cover4
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