Airstream EXPERT PN110 User Manual Download Page 27

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EXPERT PN110 rev.23

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

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

“O

ﬀ

”

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

“O

ﬀ

”

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

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.

EXPERT PN110 rev.23

EXPERT PN110

6.6. Misting

Output

To operate the misting output, the controller
refers to the average reading of the tempera-
ture probes assigned to the output.

The controller can control one misting out-
put. When the temperature reaches the start
temperature of the output, mist units are
activated and run in timer mode according to
their minimum timer (Min On Time & Min Off
Time). Then, as temperature rises, a gradual
transition is made from the minimum timer
towards the maximum timer (Max On Time
& Max Off Time). The second mist timer is
fully used when the temperature reaches the
Maximum Temperature parameter setting.
The misting output is disabled when the
temperature falls below a user-de

ned value.

It can also stop when humidity levels are too
high (see RH Compensation in chapter 10).

Max On

Time

Min On

Time

OFF

Mist

Timer

Misting

Output

T°