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sensors are available, economization will be locked
OFF and the damper will be closed until the sensor
failures can be addressed.
Inside Humidity Failure
The DAC will use the local indoor humidity
sensor if it is defined. If no local indoor humidity
sensor is defined, the DAC will use the indoor
humidity value received from the E2. If no valid value
is received from the E2, the dehumidification function
will be disabled until a valid indoor humidity reading
is detected. This applies only if the dehumidification
strategy is configured to use inside humidity or inside
dewpoint. Also, when in standalone mode, if no valid
inside humidity is detected, the Enthalpy Compare
economization strategy, if selected, will be disabled
and the controller will revert to using the Enthalpy
Setpoint method of economization.
Outside Humidity Failure
The DAC will use the local outdoor humidity
sensor if it is defined. If no local outdoor humidity
sensor is defined, the DAC will use the outdoor
humidity value received from the E2. If no valid value
is received from the E2, the dehumidification function
will be disabled until a valid outdoor humidity
reading is detected. This applies only if the
dehumidification strategy is configured to use
outdoor humidity or outdoor dewpoint. Also, when in
standalone mode, if no valid outdoor humidity is
detected, the economization method will revert to Dry
Bulb Compare.
26 • DAC Sensor Calibration Offsets in E2
7.11. DAC Sensor Calibration
Offsets in E2
DAC and E2
Figure 7-5 -
Sensor Calibration
To verify that sensor readings are accurate,
calibration of sensors may be required. Sensor
performance can be improved by limiting the
differences between a sensor's expected output and
its actual output. Once the sensor differential has been
determined, enter the offset value into the appropriate
offset parameter field to calibrate the sensor.
Steps
1.
From the E2 Main Menu
- Configured Applications (Figure 7-6).
2.
Select iProDAC from the list - the iProDAC
Status screen will open (Figure 7-7).
E2 Configured Applications - Select iProDAC
Figure 7-6 -
select
026-1727 Rev 3
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