Damper Motor - Lennox KGA Series Service Literature

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.

DAMPER MOTOR

THUMBWHEEL
FIGURE 29
RETURN AIR PLENUM
GRAVITY EXHAUST DAMPERS - HORIZONTAL
13
(330)
29-1/2
(749)
FIGURE 31
Page 36
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..
GRAVITY EXHAUST DAMPERS - DOWNFLOW
HOOD TOP
HOOD TOP
SUPPORT
FIGURE 30
DAMPER
ASSEMBLY
6-1/2
(165)