Page 59
FIGURE 28
LOWER PANEL
OUTDOOR AIR DAMPER
COVER PANEL
HORIZONTAL
RETURN AIR
OPENING
HORIZONTAL
SUPPLY AIR
OPENING
COMPRESSOR
SECTION
MANUAL DAMPER
E-Economizer E1ECON15 (standard) or
E1ECON17 (high performance)
The following is a brief description of standard economizer
E1ECON15. For more detail on this or high performance
economizer E1ECON17 see economizer installation in
struction.
The optional E1ECON15 economizer can be used with
downflow and horizontal air discharge applications. See
figure 29. The economizer uses outdoor air for free cooling
when outdoor temperature and/or humidity is suitable. The
economizer is controlled by the A55 Unit Controller.
Free Cooling Mode
The Unit Controller will allow free cooling in one of five
modes. Each mode uses different combinations of sensors
to determine outdoor air suitability. See table 24 for modes.
Temperature offset is the default free cooling mode.
NOTE - All free cooling modes of operation will modu
late dampers to 55_F (13_C) 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
a configuration ID be entered to enable the economizer.
Refer to economizer installation instructions and Unit
Controller installation and application manuals.
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