Integrated Control Equipment Curo
Supply air unit VEKA
23
Fläkt Woods
9965 GB 2016.09.27
Specifications are subject to alteration without notice
5. Control funCtionS
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 temperatu-
re compensation can not be combined with 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 temperatu-
re) 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 temperatu-
re) x cascade B = 18 – (18 – 28)) x 0.30 = 21°C.
5.3 frEEzE protECtion
Warning! Do not change these parameters unless it is absolutely
necessary. If the unit is misconfigured the water coil can freeze
up and cause water damage to property.
Freeze protection is used during low outdoor temperatures to
prevent the coil from freezing. When the unit is stopped, the tem-
perature in the water coil is maintained at the setpoint to keep the
unit warm. If there is a risk of freezing in the water coil the valve
is controlled to open.
If the temperature drops below the limit value an A-alarm is obtai-
ned, which then stops the unit.
5.4 fAn Control
3-speed control (trickle, normal, boost). To change fan speed use
schedules, external timer or PIR.
