Honeywell EXCEL 5000 User Manual page 77

EXCEL CARE CONTROL ICONS
Input signals can be in actual engineering units or generic (0-100 percent type). For
inputs that read in actual engineering units, P2 and P3 must be equal (OK to leave
default values). For generic inputs, set P2 equal to the actual sensor range (that is,
the value in engineering units that produces 100 percent at the input).
The default velocity constant P4=4005 is for pitot tube type air flow sensors. Use
proper value for type of sensor used. For linear sensors, set this value to 1.
Set the area factor P5 to the duct or pipe cross-sectional area to read flow. Some
linear sensors may be calibrated in flow units. For those sensors, set P5 to 1.
If desired, set P6 to about 5 percent of the maximum expected flow so that the
output is zero when the flow value is very low, for example, when the associated
system is off.
NOTE: For direct reading inputs, P2 and P3 must be equal (OK to use defaults).
To set up a nonlinear sensor with direct reading input value:
• Make sure the velocity constant (P4) is correct. The default value is for pitot tube
type air flow sensors.
• Set the area factor (P5) to the duct or pipe cross-sectional area.
• If desired, set the low display value (P6) to about 5 percent of the maximum
expected output so that the output reads zero when the associated system is off.
• For other parameters, use default values.
To set up a nonlinear sensor with generic (0-100 percent) input value, proceed as in
the previous paragraph for nonlinear direct-reading sensors except set sensor range
(P2) to the actual range of the input sensor (that is, the sensor value that produces
100 percent at the input).
To set up a linear sensor with direct reading input value:
• Set the velocity constant (P4) to 1.
• Set the area factor (P5) to the duct or pipe cross-sectional area if the sensor is
calibrated for velocity, or set P5 to 1 if the sensor is calibrated for flow.
• Set the square root enable (P1) to 0.
• If desired, set the low display value (P6) to about 5 percent of the maximum
expected output so that the output reads zero when the associated system is off.
• For other parameters, use default values.
To set up a linear sensor with generic (0-100 percent) input value:
Proceed as in the previous paragraph for linear direct reading sensors except set
sensor range (P2) to the actual range of the input sensor.
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ALPHABETIC REFERENCE
74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)