Lennox ALLIED Commercial TCA180S2B Standard Manual page 42

E−LAGED(H) Gravity Exhaust Dampers
LAGED18/24 dampers
TCA180/300 units, are
LAGED(H)18/24 are used in horizontal air discharge ap-
plications. LAGED(H) gravity exhaust dampers are
installed in the return air plenum . The dampers must be used
any time an economizer or power exhaust fans are applied to
TCA series units.
Gravity exhaust dampers allow exhaust air to be discharged
from the system when an economizer and/or power exhaust is
operating. Gravity exhaust dampers also prevent outdoor air
infiltration during unit off cycle. See installation instructions for
more detail.
LAGED AND LAPEF INSTALLATION
ECONOMIZER
FRESH AIR
HOOD
P18
LAGED GRAVITY
EXHAUST DAMPERS
FIGURE 28
(figure 28) available
used in downflow
C1PWRE
POWER EXHAUST
FAN ASSEMBLY
F−C1PWRE20C Power Exhaust Fans
for
C1PWRE20C available for TCA180/300 units are power ex-
and
haust fans used in downflow applications only. The fans re-
quire optional down-flow gravity exhaust dampers and
T1ECON economizers. Power exhaust fans provide exhaust
air pressure relief and also run when return air dampers are
closed and supply air blowers are operating. Figure 28
shows the location of the C1PWRE. See installation instruc-
tions for more detail.
G−Dirty Filter Switch S27
The dirty filter switch senses static pressure increase indi-
cating a dirty filter condition. The switch is N.O. and closes
at 1" W.C. (248.6 Pa) The switch is mounted on the top filter
channel corner.
H−Indoor Air Quality (CO
The indoor air quality sensor monitors CO
ports the levels to the economizer control module A6. The
board adjusts the economizer dampers according to the
CO levels. The sensor is mounted next to the indoor ther-
2
mostat or in the return air duct. Refer to the indoor air qual-
ity sensor installation instructions for proper adjustment.
Page 42
) Sensor A63
2
levels and re-
2