eCO Side - Installation and Maintenance Manual
30
FläktGroup DC_10176GB_20180924_R3
Specifications are subject to alteration without notice
10. CONTROL FUNCTIONS
EXAMPLE
1. Setpoint = 18°C
2. Extract air temperature = 16°C
This means that the new calculated setpoint for the supply air
controller is:
Calculated setpoint = se (setpoint – extract air tempera-
ture) x cascade A = 18 + (18-16) x 0.5 = 19 ° C.
ROOM CONTROL
Room control gives the best control of temperature in a specific
room and is used when only one unit serves this room. This
method works best for larger premises.
By replacing the extract temperature sensor with a tempe ra ture
sensor placed in the room a good room temperature value is
achieved.
This enables the unit to regulate the supply air temperature in a
way that maintains the room temperature at a desired level.
Limitation of the supply air temperature (min. temp. and max.
temp.) ensures that the supply air temperature is maintained
within the set range.
DEFAULT PARAMETERS FOR ROOM CONTROL
1. Controller = 2
Selects cascade control
2. Cascade reference = 0 Selects room control
3. Cascade A = 0.5
When the sensor gets colder than giv-
en setpoint value
4. Cascade B = –0.5
When the sensor gets warmer than
given setpoint value
5. Min. temp. = 15°C
Sets lowest supply air
temperature
6. Max. temp. = 25°C
Sets highest supply air temperature
EXAMPLE
1. Setpoint = 18°C
2. Room temperature = 22°
This means that the new calculated setpoint for the supply air
controller is:
Calculated setpoint = se (setpoint – room air temperature)
x cascade B = 18 – (18 – 22) x (–0.5) = 16°C.
Setpoint
Outdoor temperature compensation
Outdoor temperature, °C
+30
+25
+20
+15
35
30
25
20
15
10
5
0
–5
–10
–15
–20
OUTDOOR TEMPERATURE COMPENSATION
The setpoint temperature for supply air can be adjusted up or
down depending on the outdoor temperature. By setting a higher
set point value both on cold winter days and hot summer days
indoors comfort is improved.
In summer, this will increase energy savings. Outdoor tempera-
ture compensation can not be combined with extract air control
or room control.
DEFAULT PARAMETERS FOR OUTDOOR TEMPERATURE
COMPENSATION
1. Controller = 2
Selects cascade control.
2. Cascade reference = 1 Selects outdoor temperature
compensation.
3. Cascade A = 0,05
When the sensor gets colder than
given setpoint value.
4. Cascade B = 0.03
When the sensor gets warmer than
given setpoint value.
5. Min. temp. = 15°C
Sets lowest supply air temperature.
6. Max. temp. = 25°C
Sets highest supply air temperature.
EXAMPLE 1
1. Setpoint = 18°C
2. Outdoor air temperature = –2°C
This means that the new calculated setpoint for the supply air
controller is:
Calculated setpoint = se (setpoint – outdoor air tempera-
ture) x cascade A = 18 + (18 –(-2)) x 0.05 = 19°C
EXAMPLE 2
1. Setpoint = 18°C
2. Outdoor air temperature = 28°C
This means that the new calculated setpoint for the supply air
controller is:
Calculated setpoint = se (setpoint – outdoor air tempera-
ture) x cascade B = 18 – (18 – 28)) x 0.30 = 21°C.
