EH-105
AH CONTROLS
Operating mode
EH-105
CO2/AHU enhance
Not in use
Auto overrid
Sw.override
RoomT/AHU enhan
Not in use
Auto overrid
Sw.override
CO2/AHU start-up
In use
Not in use
Humid/AHU enhan
Not in use
Auto overrid
Sw.override
Not in use:
Auto overrid:
Sw.override:
The volume of air handling is not
controlled on the basis of a selectable factor.
If necessary, the controller
enhances air handling on the basis of a
selectable factor if the AH unit is controlled by
the controller's clock program or CO2 start-up
to run at ½ or minimum output.
The controller also enhances
air handling as illustrated above when the AH
unit runs at ½ (min) output by an external
switch connected to the controller.
29
Air handling enhancement according to air quality (CO content):
2
In contactor controlled AH units the controller switches the AH unit from ½
output to 1/1 output according to the CO content. In AC freq. converter
controlled AH units the controller switches the AH unit output steplessly from
minimum to maximum according to the CO content.
The AH unit starts up according to the CO content.
2
2
2
AH start-up:
CO2/AHU enhance
In contactor controlled AH units
n AC req. converter controlled AH units
the controller switches the AH unit from ½ output
to 1/1 output according to the room temperature. To ensure adequate heating
output, the controller switches the AH unit from 1/1 output to ½ output if the
supply temperature is below the room temperature for 8 minutes. If the supply air
temperature is 2°C above the room temperature after an hour, the AH
enhancement function can switch the AH unit to 1/1 output.
I
f
the controller begins to increase the AH
unit output steplessly according to the room temperature. To ensure adequate
heating output, ”CascadeC/OutpLim” cascade control can be used in AC freq.
converter controlled AH units.
The function is not in use during heaing when the ”HeatBoost” setting is at 0.
The function is not in use during cooling when the ”CoolBoost” setting is at 0.
Air handling enhancement with the room temperature above the set value:
In contactor controlled AH units
In AC freq. converter controlled AH units
the controller switches the AH unit to 1/1 output
as the room temperature rises.
the
controller begins to increase the AH unit output steplessly according to the room
temperature.
Air handling enhancement with the room temperature below the set value:
RoomT/AHU enhan
Only AC freq. converter controlled AH units. When the minimum setting for room
air humidity has been exceeded, the humidity function begins to steplessly
increase AH unit output. Maximum output is reached when the room air humidity
has reached the AH unit maximum room air humidity setting.
Humid/AHU enhan
Hint !
Hint !
In high rooms
(industrial buildings and sports
arenas) warm air drops more
effectively when fan output is
increased.
Hint !
Hint !
Excessive heat
can be eliminated, e.g., from
conference rooms by
increasing fan speed (without
the supply air temperature
getting too cold).
Attention!
Be careful so that excessive
radiator network heating doesn't cause
needless AH enhancement.
Air handling enhancement when the humidity is below the set value:
E.g., Increasing
AH speed in launderettes
enhances humidity elimination.
CascadeC/OutpLim
Not in use
In use
Phase 1
Phase 2
open
closed
AH minimum
output
AH output control is
included in cascade
control.
When heating is at
maximum output the
controller begins to
decrease the AH output.
Phase 4 of cascade
control on p. 26.
AHU output ctrl
Outdoor temp.
Cascade ctrl
CO2 content
Room temp.
Room humidity
Hint !
Hint !
Note!
H
n measuremens and
AH output information.
This function can be used
for
AH enhancement.
umidity is expressed as
Rh/pot i
potentiometer controlled
