Anemostat EST - Manual (Page 23)

23
1220 Watson Center Road • Carson, CA 90745
Tel: (310) 835-7500 • Fax: (310) 835-0448
www.anemostat.com • [email protected]
Fan Discharge Air Flow Adjustment
Two levels of adjustment are allowed
1. Motor HP (course)
2. SCR (fine)
Three motor (HP) taps are wired into the control enclosure to a terminal block. Factory default is the high tap (labeled
“H”). Do not operate unit without ductwork, as motor overload and failure may occur. During final balancing,
adjustment of the motor horsepower may be made inside the control enclosure, by moving the red (line-side wire from
the SCR) to a different terminal (either “M” - Medium or “L” - Low).
NOTE: Disconnect power before switching motor taps.
A small flat blade 1/8” screwdriver is required to adjust the fan discharge airflow via the SCR. The adjustment screw is
located through a small hole in the bottom of the control enclosure. You do not need to open the enclosure for this fan
speed adjustment.
1. Fan discharge airflow is field-adjusted by varying the downstream static pressure, adjusting the motor HP taps and
finally, the SCR speed controller.
2. Fan performance curves show the CFM for the various downstream static pressure (D.S.Ps) in inches of water.
These are available from the Anemostat website.
3. Models QST and QPT fan terminals are designed to operate from .1 to .8 D.S.Ps. Motors may overload if terminals
are operated at D.S.Ps below these limits. If terminals are operated at D.S.Ps above 0.8”w.g., freewheeling may
result in possible motor damage.