8
Supply Air Flow Data
Indoor CFM & External Static Pressure
Model
VEA09
VHA09/VEA12/
VHA12
VEA18
Fan Speed
Low High Low High Low High
ESP (“)
CFM
.10”
405
450 420 450 400 480
.15”
375 420 405 425 375 465
.20”
345 385 385 400 350 450
.25”
325
365 355 375 330 390
.30”
305 340 320 350 310 330
Indoor air ow may be determined by measuring the external static pressure (ESP) of the duct system using an inclined
manometer or magnahelic gauge and consulting the above chart to derive actual air ow. Under no circumstances
should the small chassis Vert-I-Pak equipment be operated at an external static pressure in excess of .3” W.C. Operation
of the Vert-I-Pak under these conditions will result in inadequate air ow, leading to poor performance and/or premature
component failure.
Control
For LOW speed only operation, connect the fan output terminal from the thermostat to the GL terminal of the electronic
control.
For HIGH speed only operation, connect the fan output terminal from the thermostat to the GH terminal of the electronic
control.
For thermostats with two-speed capability, connect the LOW speed output to the GL terminal and the HIGH speed output
to the GH terminal.
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