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KOOLMASTER PP20-VS2 rev.00
KOOLMASTER PP20-VS2
10. RH COMPENSATION
The controller offers different way to compen-
sate for high/low relative humidity (RH) levels
in the room. All compensation functions are
explained below.
Refer to section 4.6 to enable the RH
compensation functions.
1. High RH Comp. on Fan Speed:
The controller can compensate for high RH
levels by increasing the speed of variable-
speed fan outputs. When this compensation
function is used, the controller gradually in-
creases the regular speed of variable fans as
the inside relative humidity level increases*.
The graph below shows how it works.
* If variable fans are off and the ventilation level is
lower than stage 3, the controller will activate the
fans and increase their speed the same way.
When the RH level exceeds the set point, the
controller starts increasing the regular speed
of variable fan output 1; when the RH level
is 5% above the RH set point, the variable
output continues increasing in speed and
the controller starts increasing the speed of
variable fan output 2. The full compensated
speed of both variable outputs is reached
when the relative humidity level is 10% above
the RH set point.
2. High RH Comp.on the Min Vent. Timer
The controller can compensate for high hu-
midity levels by increasing the level of mini-
mum ventilation. As the RH level rises, the
controller increases the
“On Time”
portion of
the minimum ventilation timer to compensate
for the change. The maximum compensated
“On Time”
is reached when the RH level is
10% above the RH set point.
RH Compensation on
Minimum Ventilation
RH Level
(%)
10%
RH Set Point
Off
Regular
On
Time
Compen-
sated
On Time
On Time of
the Min
Vent. timer
Added Time
RH Comp. on the
Fan Speed
RH
level
(%)
Fan Speed
V1 Speed
RH Set Point
V1
regular
speed
V2 initial
speed
V1 added
speed
V2 added
speed
Compen-
sated
speed
V2 Speed
5%
5%
3. High RH compensation with Kool-Cel®s &
mist outputs:
If RH levels are too high, the controller can
stop the misting output and/or Kool-Cel®
output. Theses outputs are disabled when
RH levels reach the respective RH shutoff
limit of each output.
Low RH compensation with mist outputs:
4.
To compensate for low RH levels, the control-
ler can activate the misting output in timer
mode. The misting output starts when RH lev-
els decrease below the Low RH Set Point.
5. High RH Comp. with the Heating Outputs:
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.
ON
OFF
Output
Status
RH Heat Timer
Time
ON Time
Cycle
Time
RH Comp. with
Heating Outputs
RH Level
(%)
10%
RH Set Point
Maximum
On Time
Minimum
On Time
Off Time
On Time of
the Heating
Timer
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.
Summary of Contents for Koolmaster PP20-VS2
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