TAB Journal Spring 2018 - 6

for constant volume systems, including General Exhaust and
Return Air systems, with or without a VFD controller.
During new system installation and the subsequent balance
work, return air (RA) systems are shown on the construction
drawings to have a much higher required CFM value than
will actually be needed during normal operation. This is
due to the offset and tracking of the RA fan to the supply
air (SA) fan though the control sequence and the outdoor air
(OA) requirement. Therefore, it is common practice for TAB
contractors to manually modulate the RA fan speed or damper
positions to maintain the total required RA volume as shown on
the contract drawings during balancing so a proper proportion
can be met. Then the systems are placed into normal control at
the completion of the balance work. However, during remodel
work, this is not normally performed or feasible due to adverse
negative conditions being created by higher than required
return volume being drawn out versus the supply that is being
delivered. The most common result is the balance contractor
being directed to balance with the available air on hand within
the scope of the project. Depending on the operating conditions
and required loads being placed upon the air delivery systems
at the time of the balance work, the RA values that are obtained
likely will only be repeatable when the AHU system is

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TAB Journal Spring 2018

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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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