Rh Compensation - Airstream EXPERT PN110 User Manual

EXPERT PN110

10. RH COMPENSATION

The controller offers different way to com-
pensate for high/low relative humidity (RH)
levels in the room. All compensation functions
are explained below. To use them, you must
enable each desired compensation function
in section 4.6.
1. High RH Comp. with the Heating Out-
puts: The controller can compensate for high
humidity levels by activating the heaters in
timer mode. As the RH level increases, the
controller increases the "On Time" portion
of the heating timer to compensate for the
change. The maximum compensated heating
"On Time" is reached when the RH level is
10% above the RH Set Point.
RH Comp. with
On Time of
Heating Outputs
the Heating
Timer
Maximum
On Time
Minimum
On Time
Off Time
10%
RH Set Point
The RH heat timer is composed of an "On
Time" and of a "Cycle Time". The heaters run
during the "On Time" and then stop until the
end of the "Cycle Time". The "On Time" por-
tion of this cycle increases as the RH level
increases.
RH Heat Timer
Output
Status
ON
OFF
ON Time
Cycle
Time
2. High RH Comp.on the Min Vent. Speed
The controller can compensate for a high hu-
midity levels by increasing the level of minimum
ventilation. As the RH level rises, the controller
increases the minimum ventilation speed to
compensate for the change. The maximum
compensated speed is reached when the RH
level is 10% above the RH set point.
Stage 1
Minimum
Speed
Compen-
sated
Speed
Regular
Speed
Off
3. Mist Shutoff: When the humidity level is
too high, the mist units are shut off to avoid
increasing the humidity level any further. This
means that the cooling stage stops operating
whenever the humidity level exceeds the mist
shutoff limit. The mist shutoff limit ranges
RH Level
(%)
from 20% to 100% (Off) of humidity.
4. Low RH comp. with mist outputs: To
compensate for low RH levels, the controller
can activate the misting output in timer mode.
The misting output starts when RH levels
decrease below the Low RH Set Point.
1. Select:
» HUMIDITY COMPENS.*
*This menu is accessible if at least 1 RH compensa-
tion function is enabled (sec. 4.6 ).
RH Compensation
Min vent comp %
RH set point
Heater Compensation
Time
Min On Time(s)
Max On Time(s)
Cycle Time 300sec
Mist Shutoff
Mist on Lo %RH
Lo SetPoint
On Time
Off Time
RH Compensation on
Minimum Ventilation
Speed
RH Level
10%
(%)
RH Set Point
30
65
15
15
85
10
30sec
240sec
2. Set the following parameters:
Minimum Ventilation Compensation
Min Vent Comp % — Select by how much the
minimum fan speed can be increased when
the RH level if 10% above the RH Set Point.
*Accessible if RH compensation on minimum ventila-
tion is enabled at the beginning of this section.
RH Set Point — This is the humidity level
above which high RH compensation func-
tions start. Adjustable from 20 to 99% of
humidity.
Heater Compensation
The timer used by heating outputs is made of an On
Time and of a Cycle Time. Heating outputs run dur-
ing the On Time then stop until the end of the Cycle
Time. The On Time portion of this cycle increases
as RH levels increase.
Minimum & Maximum On Times — Set the
minimum and maximum On Times of the
heating timer. The minimum On Time starts
being used when indoor humidity levels reach
the RH set point; the maximum On Time is
used when humidity levels are 10% above
the RH set point. *Accessible if RH compensation
with heating outputs is enabled at the beginning of
this section.
Cycle Time — Set the cycle time of the
heating timer. *Accessible if RH compensation
with heating outputs is enabled at the beginning of
this section.
Mist Shutoff — Set the humidity level above
which the mist cooling output stops or select
"Off" to disable this function. *Accessible if the
mist shutoff compensation option is enabled at the
beginning of this section.
Mist on Low RH Lo Set Point — Set the humid-
ity level below which misting units start run-
ning in timer mode or select "Off" to disable
this function. *Accessible if RH comp. on Low RH
levels is enabled at the beginning of this section.
On & Off Times — Set the On and Off Times
of the misting timer.
EXPERT PN110 rev.23
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