Lennox GCS16R-411-100

Page 43
2-REMD16 Downflow Economizer
REMD16M Downflow Economizer
The REMD16 and REMD16M economizers (figure
44) are designed for use with standard (downflow)
GCS16s. The economizer opens a set of dampers
to allow 0 to 100 percent outdoor air to be used for
cooling when outdoor humidity and temperature are
acceptable. Additional (2nd stage) cooling demand
is directed to the compressor while the dampers re
main open. If outdoor air becomes unacceptable,
the outdoor air dampers close to a predetermined
minimum position while the compressor cooling cir
cuit cycles as needed.
Refer to the REMD16-41/65 Installation Instruction
Manual for specific details regarding installation.
Refer to the sequence of operation flowcharts (in
back of this manual) for detailed operation of the
economizer. The sequence of operation flowcharts
also describe how the economizer interacts with the
GCS16 and the control system being used.
FIGURE 44
REMD16 DOWNFLOW ECONOMIZER
REMD16M DOWNFLOW ECONOMIZER
OUTDOOR AIR
DAMPERS
RETURN AIR
DAMPERS
FACTORY INSTALLED
RETURN AIR FILTER
DAMPER MOTOR
ENTHALPY CONTROL
TYPICAL
(REMD16M shown)
OUTDOOR AIR
DAMPER HOOD
CONTROL ACCESS
COVER
3-EMDH16 Horizontal Economizer
EMDH16M Horizontal Economizer
The EMDH16 and EMDH16M economizers (figure
45) operate like the REMD16 and REMD16M ex
cept they are designed for GCS16 units requiring
horizontal discharge and return air. Internal compo
nents and operation of the horizontal economizer
are identical to the downflow economizer.
Refer to the EMDH16-41/65 Installation Instruction
Manual for specific details regarding installation.
Refer to the sequence of operation flowcharts (in
back of this manual) for detailed operation of the
economizer. The sequence of operation flowcharts
also describe how the economizer interacts with the
GCS16 and the control system being used.
FIGURE 45
EMDH16 HORIZONTAL ECONOMIZER
EMDH16M HORIZONTAL ECONOMIZER
OUTDOOR AIR
DAMPERS
(under hood)
RETURN AIR
DAMPERS
FACTORY INSTALLED
RETURN AIR FILTER
OUTDOOR AIR
DAMPER HOOD
FACTORY
INSTALLED
TRANSITION
CONTROL ACCESS
COVER REMOVED
The physical location of controls in the REMD16M
and REMD16 economizers is shown in figure 46.
The physical location of controls in the EMDH16M
and EMDH16 economizers is shown in figure 47.