WattMaster Auto-Zone Plus, Проектирование, установка и эксплуатация

Страница: 19 / 180

Auto-Zone Plus
Section 1
Design Guide 1-13
Step #5 - Bypass Damper Sizing
Using a load calculation program, the bypass damper should be sized to give you the
maximum CFM of air to be bypassed, typically 60 to 70 percent of the HVAC units rated
capacity.
To size the damper, select a damper from the table based on calculated bypass CFM and
a maximum velocity between 1750-2250 FPM. When determining the bypass duct size,
be sure to take into account any transition fittings and associated pressure drops. (See
Table 1-1: Damper Sizing Chart )
Whenever possible, use a single bypass damper and round duct for the bypass. If space
limitations or total airflow requires it, multiple bypass dampers can be controlled in
parallel.
For proper control of the Bypass Damper, the static pressure sensor location is very
important. Refer to
Figure 1-3: Locating the Static Pressure Sensor for Bypass
Damper Control for proper mounting locations.
firealarmresources.com