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To allow the Economizer mode to be activated, the following conditions must be
reached:
•
The ECONOMIZER ENABLE must be enabled.
•
The thermostat mode must be AUTO or COOL.
The outdoor temperature (IN2) must be below the ECONOMIZER
•
CHANGEOVER SETPOINT value.
•
The outdoor temperature (IN2) must be below the room temperature.
The Supply Air temperature (IN3) must be above the ECONOMIZER
•
SUPPLY AIR TEMPERATURE SETPOINT value.
When the Economizer mode is activated, the FAN and ECO output relays are
energized until SET POINT COOL is reached.
Pre-occupancy Purge
The pre-occupancy purge is used only when the schedule is active. The thermostat
energizes the FAN and ECO relay outputs a period of time before a transition from
unoccupied to occupied. This period is determined by the ECO PRE-OCCUPANCY
PURGE_PERIOD.
To allow the pre-occupancy purge to be activated, the following conditions must be
reached:
•
The ECONOMIZER ENABLE must be enabled.
•
The scheduler must be enabled.
•
The ECO PRE-OCCUPANCY PURGE_PERIOD must be different than OFF.
NOTE: This parameter is set through network and is not accessible on the display
of the thermostat.
3.8.6. Internal Temperature Offset
Default Value: -0.7°C
Temperature offset applied to the internal temperature measurement.
3.8.7. Delay Fan
Default Value: 60 seconds
Time delay before stopping the fan after heating or cooling stages turn off.
3.8.8. Temperature Filter Time (Sampling Rate)
Default Value: 60 seconds
Temperature Filter Time is the time constant on the temperature measurement.
(Time base for the software sampling, with four (4) samples required to get the
filtered value).
30 • Emerson Programmable Touchscreen Thermostat I&O Manual
026-1739 Rev 0
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