Page 41
H-Economizer (all units) (Field or Factory Installed)
-
ing when outdoor temperature and/or humidity is suitable.
Free Cooling Mode
-
sors to determine outdoor air suitability. See table 13
mode.
NOTE - All free cooling modes of operation will modulate
dampers to 55F (13C) supply / discharge air.
Unit Controller Settings
-
and keypad on the Unit Controller are used to navigate
through menus to adjust settings. Some versions require
-
er. Refer to economizer installation instructions and Unit
Controller installation and application manuals.
I-Gravity Exhaust Dampers
-
ty 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 LGT units.
Gravity exhaust dampers allow exhaust air to be dis-
charged from the system when an economizer and/or
power exhaust is operating. Gravity exhaust dampers also
installation instructions for more detail.
PEF POWER
EXHAUST FAN ASSEMBLY
(ORDERED SEPARATELY)
GED GRAVITY
EXHAUST DAMPERS
GED AND PEF
FIGURE 31
J-LAPEF Power Exhaust Fans
dampers and LAREMD economizer. Power exhaust fans
provide exhaust air pressure relief and also run when re-
turn air dampers are closed and supply air blowers are op-
installation instructions for more detail.
POWER EXHAUST FAN
POWER EXHAUST
FAN ASSEMBLY
RETURN AIR
OPENING
P18/P24
FIGURE 32
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