EH-105
COOLING
EH-105
Cooling is in use when it has been taken into use in the operating mode
menu and its operating mode has been specified (see p. 38). Dropping the room
temperature by other means than mechanical cooling; illustrated on page 33 and
38. (HRU and/or damper reverse summer function and night ventilation).
Factory
setting:
Explanation:
Room controlled cooling
Stepped control (magn. valves)
Heat/coolHys
2.5 °C 1.0 ... 5.0°C
The least amount that the room temperature must be above the day temperature
setting so that cooling control begins.
The outdoor temperature below which cooling is inhibited.
The room temperature above which mechanical night cooling starts up. At the same
time the AH unit automatically starts up at 1/1 output/ maximum output*. At a 0
setting, night cooling is not activated. The same cooling inhibitors limit night cooling
and daytime cooling. Attention! An outdoor sensor must be installed outside (not in
a fresh air channel) and the room temperature sensor inside (not in an exhaust air
channel).
*) An AC freq. converter controlled AH unit is in use.
Select
Mainten.mode
Cooling
P-room C.
I-room C.
I-maxEffect
P-min limit
I-min limit
ReverseDel
3 °C
60 min
30 %
30 °C
40 s
3 min
1 ... 8 °C
10 ... 120 min
0 ... 100%
5 ... 100°C
10 ... 500 s
1 ... 8min
Range:
Factory
setting:
Tuning
value:
Explanation:
When the room temperature rises 0.6°C above the cooling period set value, I-
control is activated. I-control can change actuator control at the most by the ”I-
maxEffect” set value. The effect of I-control begins to decrease when the
room temperature drops below a temperature equivalent to the room
temperature during the cooling 0.3°C. The ”I-maxEffect” setting is the
P-amount when calculating the I-value
When the supply air temperature (
) drops below the set minimum
value, the supply air temperature minimum limit's PI-controller begins
decreasing the actuator control. The effect of the minimum limit PI-control is
set with ”P-min limit” and ”I-min limit” settings.
When the supply air temperature (
) drops below the set minimum
value, the supply air temperature minimum limit's PI-controller begins
decreasing the actuator control after the reverse delay. When the supply air
temperature exceeds the ”
” temperature and the set reverse delay
time has passed, the minimum limit's PI-controller begins ending control. The
set reverse delay time is valid if the supply air temperature drops below or
during the exit phase exceeds the set temperature value by at least 4°C. If the
deviation is smaller, the reverse delay time is continued steplessly from
100%…0% with a deviation of 0.2°C…4.0°C.
SuppMinCool
SuppMinCool
SuppMinCool
COOLING TUNING VALUES
COOLING SETTINGS
Settings
Tuning values
Room controlled cooling
Continuous control
Supply controlled cooling
Room controlled cooling, stepped control (magn. valves)
39
20 … 50°C
5 … 50°C
+7 °C
0 °C
Outd.inhibit
Night cool.
Hint !
Hint !
Example: ADP room
night cooling enhances night
ventilation. The controller starts up
the AH unit and cools mechanically.
Settings Cool.
Heat/coolHys
Outd.inhibit
Night cool.
°C
2.5
+7
0
Setting:
Range:
Tuning values
P-room C
°C
I-room C.
min
I-maxEffect
%
P-min limit
°C
I-min limit
s
ReverseDel. min
.
3
60
30
30
40
3
Tuning values
Room comp.R.
I-room C.
min
I-maxEffect
°C
P-supp.air
°C
I-supp.air
s
3
30
80
60
3
Tuning values
P-area
°C
I-time
s
ReverseDel. min
30
80
3
Attention! The cooling period set value
means the sum of the room
temperature set value + the ”Heat/cool
Hys” set value.
Attention! The cooling period set value
means the sum of the room
temperature set value + the ”Heat/cool
Hys” set value.
With magnetic valve controlled stepped cooling, when the room temperature
rises above the set value of the cooling period, actuator control begins to
increase linearly in relation to the room temperature deviation, reaching 100%
when the room temperature has risen above the set value of the cooling period
by an amount equal to the P-area. A change in the unit's control direction is
slowed down by the turn delay.
Instr.
p.23
