Page 246 - HVAC Pump Handbook

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The Use of Water in HVAC Systems

The Use of Water in HVAC Systems 243

describes the correct method for checking the flow through such coils.
The differential pressure across the coil or control valve in Fig. 8.14b
is checked, and the flow is verified from technical data on that coil.
This is just as accurate as the balance-valve method; it may provide
greater accuracy because a much larger differential signal is achieved
by measuring the pressure drop across the coil. The permanent loss
across the calibrated balance valve is eliminated. The flow through
the coil during commissioning should be controlled by its control
valve, not any other device. This should check the coil flow and the
control-valve operation at the same time.
Every traditional practice during initial operation of a water sys-
tem such as this coil testing must be evaluated to determine if any
energy waste is occurring.

8.10 Bibliography
Ben L. Kincaid and Andrew Spradley, Removing Manual Balancing in a High School,
1995.
The Water Management Manual, SYSTECON, Inc., West Chester, Ohio, 1992.

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