EH-105
According to outdoor temperature:
The damper position is linearly controlled by set outdoor
temperature limits. The outdoor temperature limits are
set in damper settings (”Position/OutdT”). See next
page. The position of the dampers can only be
controlled by a voltage controlled actuator.
The dampers have not been taken into use.
Not in use:
ON-OFF:
The fresh air damper and exhaust air damper are open while the air handling
unit is running. When the AH unit shuts down the dampers close.
Operating mode
On/Off
Cascade ctrl->
CO2 control->
Const.position
Accor.to outdT
Not in use
Cascade ctrl:
When cascade control is taken into use, energy consumption can be
lowered by controlling the proportion of fresh air to circulating air by the position of the
dampers. 0% = only circulating air, 100% = only fresh air. You can set the minimum and
maximum positions of the fresh air damper in the user level settings as well as the
minimim position of the damper for cooling. (range 0…100%). Voltage controlled actuators
are suitable for use in cascade control. (Operating sequence for controls, see p. 26 and
27)
Summer function
No reverse
Reverse
Const. position:
The proportion of circulating air and fresh air is kept constant. The
mixing ratio is set in the user level at the ”DampStandMix” setting. The % indicates the
position of the fresh air damper. 0% = only circulating air and 100% = only fresh air. The
position of constant position dampers can only be driven by a voltage controlled actuator.
ppm
Fresh air damper minimum position %
600
1000
30%
100%
Summer function - reverse-
With the reverse summer function, the cooling need can be
decreased during hot summer weather by limiting the amount of outdoor air with
dampers. When it is warmer outside than inside and when half of the hysteresis between
heating and cooling is realized, the dampers are driven to the minimum fresh air position
of the cooling period.
Outdoor temperature
°C
-15
+16
CO
2
CO
2
CO -content
2
DAMPERS:
Operating mode
+/-
Select
Mainten.mode
Damper
Dampers
Operation mode
Settings
Tuning values
Actuator
The dampers are taken into use here and the operation mode is defined.
Press the group select button to go from one control sequence to the next.
Hint !
Hint !
AH fans can
also be controlled by the
CO content. See p. 31
2
.
Max
Min
33
CO2 control:
Air handling is controlled so that a good
air quality is maintained. The controller changes the
fresh air damper's minimum position according to the
CO content. Fresh air dampers open from a minimum to
maximum position according to the CO content. When
the carbon dioxide content exceeds the
set
value the controller opens the fresh air damper. The
damper reaches it's maximum position when the CO
content reaches the
set value. The same
CO limits apply during both heating and cooling
situations. If the AH unit starts up on the basis of the
CO content, the fresh air damper opens at least 30%
(programmed lock).
2
2
2
2
2
"Min/CO2 "
2
"Max/C02 "
2
Instr.
p.23
Fresh air damper minimum position %
