11 -4
MODEL (S): 1286, 1287
Test Voltage: 1
15, 230 Frequency: 60, 50 Hz FLA:
Magnehelic Gauge Reading
Damper Position: Position from "Open"
(Test points on speed control board - Terminal
"N" neutral and Terminal "M" motor.)
True RMS Voltage To motor:
NOTE: Use True RMS volt meter.
Velocity Profile: 6.0 Inches from side with successive points 5.55 inches apart.
6.0 Inches from rear wall with successive points 5.50 inches apart in a plane four inches above the
window edge.
Rear Wall
Total Sum
÷ 36 = average down flow velocity LFPM.
Acceptable down flow range 70-80 in linear feet per minute.
Work Access Opening Airflow
A. Direct Reading Instrument Method
Inflow volume (~ exhaust volume)
cu. ft.
÷ Front access opening 5.052 sq. ft.
= Calculated face velocity
LFPM
Acceptable range for face velocity 105-115 LFPM
B. Thermal anemometer Method
17 Readings
1.5” below bottom edge of window (3” high constricted opening), 6.00” from inside edges of the
access opening (sidewalls), with successive pts. 3.80” side to side. NOTE: Gaps between window
and front face of side wall must be sealed during testing. Thermal anemometer probe must be
positioned at a 30° angle from front nosing. Multiply K factor of 1.08 by average velocity reading.
3” access opening 1.516 sq. ft.
10” access opening 5.052 sq. ft.
Acceptable range for face velocity 105-115 LFPM
TESTED BY:
DATE:
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