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EXPERT PN110
6.3.4. Inlet Calibration
[For potentiometer-based inlets only]
If the inlet uses a potentiometer, the actuator
of the inlet must be calibrated. This calibra-
tion tells the controller what are the minimum
and maximum positions of the actuator:
Minimum calibrated position = opening of 0%
Max. calibrated position = opening of 100%
1. Select:
» INLET
1. Stage Opening*
»
* This menu is accessible if the inlet is enabled
(section 4.5).
Inlet
Status :
Auto
Position
0%
Calibration?
Yes
Minimum
Save
Maximum
Set
2. Minimum — To calibrate the minimum
position, use the "Close" switch to close the
inlet to its minimum position. Once the inlet
is closed, set the manual control switch to
"Off " to stop the actuator. *This parameter is
accessible if the inlet uses a potentiometer.
Now that the actuator is closed, answer "Yes"
to the "Minimum" parameter on screen. Once
the "Yes" answer is posted, the controller
shows the word "Save" for 5 seconds and then
displays "No" again; the minimum position has
now been saved.
3. Save maximum posi-
tion? — To calibrate the
maximum position, use
the "Open" manual control
switch to fully open the inlet. Once the maxi-
mum inlet opening is reached, set the manual
control switch to "Off " to stop the actuator.
Now that the actuator is closed, answer "Yes"
to the "Minimum" parameter on screen. Once
the "Yes" answer is posted, the controller
shows the word "Save" for 5 seconds and then
displays "No" again; the maximum position
has now been saved.
4. Once the calibration is
22
EXPERT PN110 rev.23
completed, set the manual control switch
back to the "Auto" position to enable the au-
tomatic control of the inlet.
For best results, make sure at least
12 inches (30 cm) separates the minimum
actuator's position from its maximum
position.
6.3.5. Opening Compensations
• Temperature Compensation:
The inlet temperature compensation is ex-
pressed as a percentage per degree difference
between the average controller temperature
and the average reading of the probes as-
signed to the inlet. It determines by how much
the inlet must open or close to help reduce
the temperature differences in the building.
For each degree above or below the average
temperature, the inlet will open or close us-
ing the compensation value assigned by the
user. For example, if the compensation value
is set to 2%/°F and the inlet's probes read
3°F above the average controller tempera-
ture, the inlet will open 6% to help decrease
the temperature in that zone. The maximum
temperature compensation value is 10%.
• Static Pressure Compensation
The static pressure compensation is ex-
pressed as a percentage per 0.01inch of water
(%/0.01"WC). It determines by how much
the inlet must open or close to help reduce
or enhance the static pressure in the building
according to set points. For each .01"WC
above the high static pressure set point or
below the low static pressure set point, the
inlet will open or close using the compensa-
tion value assigned by the user. For example,
if the compensation value is set to 1%/"WC
and the static pressure is 0.05"WC above
the high static pressure set point, the inlet
will open of 5% to help decrease the static
pressure in the building. The maximum static
pressure compensation value is 10%.
1. Select:
» INLET
2. Compensation*
»
1. Temp & Static
»
* This menu is accessible if the inlet is enabled
(section 4.5).
Inlet Compensation
Temp Comp
5%/°F
Stat Press
3%/WC
2. Set the following parameters:
Temp Comp — Set the temperature compen-
sation to the desired value.
Stat Press — Set the static pressure compen-
sation to the desired value. *This parameter
is accessible if the static pressure sensor is used
(sec. 4.7.1).
• Static Pressure Comp. Stages
The procedure below shows how to select
the fan stages on which the static pressure
compensation will be applied.
1. Select:
» INLET
2. Compensation*
»
2. Static Stages**
»
* This menu is accessible if the inlet is enabled
(section 4.5).
** This menu is accessible if the static pressure sen-
sor is enabled (section 4.7.1).
Comp. Static Stages
12345678
2. Put check marks to identify the fan
stage(s) on which the static pressure com-
pensation is applied.
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