Page 38
E1DAMP20 MOTORIZED OUTDOOR AIR DAMPER
C1DAMP10 MANUAL OUTDOOR AIR DAMPER
FIGURE 32
FILTER BRACKET SIDE VIEW
HOOD TOP
FILTER
HOOD TOP SEAL
D-Supply and Return Diffusers
Optional flush mount diffuser/return FD11 and extended
mount diffuser/return RTD11 are available for use with all
LDT units. Refer to manufacturer's instructions included
with transition for detailed installation procedures.
E-E1ECON15C-2 Standard and
E1ECON17C-1 High Performance
Economizer
(Field or Factory Installed)
The optional economizer can be used with downflow and
horizontal air discharge applications. The economizer uses
outdoor air for free cooling when temperature and/or
humidity is suitable. An economizer hood is furnished with
the economizer.
NOTE - Gravity exhaust dampers are required with
power exhaust.
The economizer is controlled by the A55 Unit Controller.
The economizer will operate in one of four modes. Each
mode requires a different A55 Unit Controller DIP switch
setting. Each mode also requires different sensors.
The following is a brief description. See economizer
installation instruction for more detail.
1-“TMP” MODE (SENSIBLE TEMPERATURE)
In the “TMP” mode, the IMC uses input from the factory
installed RT6 Supply Air Sensor, RT16 Return Air Sensor
and RT17 Outdoor Air Sensor to determine suitability of
outside air and economizer damper operation. When
outdoor sensible temperature is less than return air
sensible temperature, outdoor air is used for cooling. This
may be supplemented by mechanical cooling to meet
comfort demands. This application does not require
additional optional sensors.
2-“ODE” MODE (OUTDOOR ENTHALPY)
The “ODE” or outdoor enthalpy mode requires a
field-provided and -installed Honeywell C7400 enthalpy
sensor (16K96). The sensor monitors outdoor air
temperature and humidity (enthalpy). When outdoor air
enthalpy is below the enthalpy control setpoint, the
economizer modulates to allow outdoor air for free cooling.
3-“DIF” MODE (DIFFERENTIAL ENTHALPY)
The “DIF” or differential enthalpy mode requires two
field-provided and -installed Honeywell C7400 enthalpy
sensors (16K97). One sensor is installed in the outside air
opening and the other sensor is installed in the return air
opening. When the outdoor air enthalpy is below the return
air enthalpy, the economizer opens to bring in outdoor air
for free cooling.
4-“GLO” MODE (GLOBAL)
Global Mode - The “GLO” or global mode is used with an
energy management system which includes a global
control feature. Global control is used when multiple units
(in one location) respond to a single outdoor air sensor.
Each energy management system uses a specific type of
outdoor sensor which is installed and wired by the controls
contractor.
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