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B-Outdoor Air Dampers
Optional manual and motorized outdoor air dampers pro
vide fresh outdoor air. The motorized damper assembly
opens to minimum position during the occupied time peri
od and remains closed during the unoccupied period.
Manual damper assembly is set at installation and re
mains in that position.
Set damper minimum position in the same manner as
economizer minimum position. Adjust motorized damper
position using the thumbwheel on the damper motor. See
figure 29. Manual damper fresh air intake percentage can
be determined in the same manner.
FIGURE 29
DAMPER MOTOR
THUMBWHEEL
F-Gravity Exhaust Dampers
Dampers are used in downflow (see figure 30) and horizon
tal (see figure 31) air discharge applications. Horizontal
gravity exhaust dampers are installed in the return air duct.
The dampers must be used any time an economizer and a
power exhaust fan is applied to KGA series units.
Gravity exhaust dampers allow exhaust air to be dis
charged from the system when an economizer and/or pow
er exhaust is operating. Gravity exhaust dampers also pre
vent outdoor air infiltration during unit off cycle. See
installation instructions for more detail.
NOTE - GED is optional except when used with power
exhaust dampers, where it is required..
FIGURE 30
GRAVITY EXHAUST DAMPERS - DOWNFLOW
DAMPER
ASSEMBLY
HOOD TOP
HOOD TOP
SUPPORT
FIGURE 31
GRAVITY EXHAUST DAMPERS - HORIZONTAL
13
(330)
29-1/2
(749)
RETURN AIR PLENUM
6-1/2
(165)
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