Page 37
E-K1ECON20B Economizer
(Field- or Factory-Installed)
FIGURE 26. The economizer uses outdoor air for free
cooling when outdoor temperature and/or humidity is suit-
-
troller.
Free Cooling Mode
-
sors to determine outdoor air suitability. See TABLE 12
mode.
NOTE - All free cooling modes of operation will modulate
dampers to 55F (13C) supply / discharge air.
Unit Controller Settings
On early versions, switches are located on the Unit Con-
troller to adjust settings. On newer versions, the display
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
F-Barometric Relief Dampers
-
-
tal barometric relief 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 LDT series units.
Barometric relief dampers allow exhaust air to be dis-
charged from the system when an economizer and/or
power exhaust is operating. Barometric relief dampers
See installation instructions for more detail.
NOTE- Barometric relief damper is optional except re-
quired with power exhaust dampers.
G-Power Exhaust Fan
-
al gravity exhaust damper and economizer and is used in
exhaust fan provides exhaust air pressure relief and also
runs when return air dampers are closed and the supply
air blower is operating. See installation instructions for
more detail.
Power Exhaust Setpoint Adjustment
Locate the A6 enthalpy control in the control area. The
EXH SET potentiometer is factory-set at approximately
open. Adjust the EXH SET potentiometer higher (clock-
-
ther open. Adjust the EXH SET potentiometer lower (coun-
are further closed. (Thirty-second delay allows dampers to
BAROMETRIC RELIEF DAMPERS - DOWNFLOW
DAMPER
ASSEMBLY
HOOD TOP
HOOD TOP
SUPPORT
FIGURE 27
BAROMETRIC RELIEF DAMPERS - HORIZONTAL
13
(330)
29-1/2
(749)
RETURN AIR PLENUM
6-1/2
(165)
FIGURE 28
POWER EXHAUST FAN AND
BAROMETRIC EXHAUST DAMPER INSTALLATION
PEF POWER EXHAUST FAN
ASSEMBLY
(ORDERED SEPARATELY)
C6
GED GRAVITY
EXHAUST
DAMPERS
P18
FIGURE 29
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