Lennox LGH094U Unit Information page 63

RT16
RETURN
AIR SENSOR
RT17
OUTDOOR AIR SENSOR (ON HIGH
AND STANDARD EFFICIENCY UNITS
EQUIPPED WITH TUBE/FIN COIL)
I-Gravity Exhaust Dampers
LAGEDH03/15 dampers (figure 46) are used in downflow
and horizontal air discharge applications. Horizontal
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 LGH 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.
GED AND PEF
EXHAUST DAMPERS
FIGURE 46
SENSOR LOCATION
FIN/TUBE UNIT SHOWN
RT6
DISCHARGE AIR
SENSOR
PEF POWER
EXHAUST FAN ASSEMBLY
(ORDERED SEPARATELY)
GED GRAVITY
FIGURE 45
J-LAPEF Power Exhaust Fans
Power exhaust fans are used in downflow applications only.
Fan requires optional down flow gravity exhaust dampers and
LAREMD economizer. Power exhaust fans provide exhaust
air pressure relief and also run when return air dampers are
closed and supply air blowers are operating. Figure 47
shows the location of the LAPEF. See installation instruc­
tions for more detail.
POWER EXHAUST FAN
Page 63
RT17
OUTDOOR AIR SENSOR (ON
ULTRA HIGH EFFICIENCY UNITS
AND UNITS EQUIPPED WITH AN
ALL-ALUMINUM COIL; SECURED
TO INSIDE OF CORNER MULLION)
P18/P24 RETURN AIR
OPENING
POWER EXHAUST
FAN ASSEMBLY
FIGURE 47