Swegon GOLD RX - Outdoor Air Compensation

GB.GOLDSKE.160901
36 www.swegon.com
We reserve the right to alter specifications without notice.
6.4.1.8 Outdoor air compensation
Outdoor air compensation of the airflow can be activated if you
want to change the airflow for specific outdoor air temperatures.
An individually adjusted curve regulates the ratio between the
airflow and the outdoor air temperature. The curve has four
adjustable breakpoints..
If the function is selected solely for low speed or high speed
operation, the curve will regulate only one of these. The airflow
for the operating case that has not been selected will then be
according to the preset set point for airflow/duct pressure.
In the flow regulation mode, the current set point for airflow is
changed. When pressure regulation is selected, the current set
point for pressure is changed. The function has no effect if the
airflow is demand-controlled.
The airflow change is expressed in the preset airflow unit and
pressure in Pa.
Settings:
Value Setting
range
Factory
setting
Outdoor air compensation mode Inactive/Low
speed/High
speed/Low
speed and
High speed
Inactive
X1, breakpoint, outdoor air temp. -50 – +50 °C -20 °C
X2, breakpoint, outdoor air temp. -50 – +50 °C -10 °C
X3, breakpoint, outdoor air temp. -50 – +50 °C +10 °C
X4, breakpoint, outdoor air temp. -50 – +50 °C +20 °C
Supply air, flow
Y1, breakpoint, supply air
1)
25% of max.
airflow for air
handling unit
Y2, breakpoint, supply air
1)
25% of max.
airflow for air
handling unit
Y3, breakpoint, supply air
1)
25% of max.
airflow for air
handling unit
Y4, breakpoint, supply air
1)
25% of max.
airflow for air
handling unit
Extract air, flow
Y1, breakpoint, extract air
1)
25% of max.
airflow for air
handling unit
Y2, breakpoint, extract air
1)
25% of max.
airflow for air
handling unit
Y3, breakpoint, extract air
1)
25% of max.
airflow for air
handling unit
Y4, breakpoint, extract air
1)
25% of max.
airflow for air
handling unit
Supply air, pressure
Y1, breakpoint, supply air 20-750 Pa 100 Pa
Y2, breakpoint, supply air 20-750 Pa 100 Pa
Y3, breakpoint, supply air 20-750 Pa 100 Pa
Y4, breakpoint, supply air 20-750 Pa 100 Pa
Extract air, pressure
Y1, breakpoint, extract air 20-750 Pa 100 Pa
Y2, breakpoint, extract air 20-750 Pa 100 Pa
Y3, breakpoint, extract air 20-750 Pa 100 Pa
Y4, breakpoint, extract air 20-750 Pa 100 Pa
1)
See table for min./max. flows in Section 6.4.1.2
Y = Set point for airflow, m
3
/s
X = Outdoor air temperature °C
Outdoor air
compensation
Example:
Flow regulated air handling unit The same principle can be ap-
plied to a pressure regulated AHU, however this well cause a
reduction in pressure in Pa.
If the outdoor air temperature is under -20 °C (X1), the flow set
point will be a constant 2.0m
3
/s (Y1).
If the outdoor air temperature is between -20 °C (X1) and -10
°C (X2), the airflow will decrease from 2.0 m
3
/s (Y1) to 1.0 m
3
/s
(Y2) as shown in the curve.
If the outdoor air temperature is between -10 °C (X2) and 10 °C
(X3), the flow set point will be a constant 1.0 m
3
/s (Y2 and Y3).
If the outdoor air temperature is between 10 °C (X3) and 20 °C
(X4), the airflow will increase from 1.0 m
3
/s (Y3) to 2.5 m
3
/s (Y4)
as shown in the curve.
If the outdoor air temperature is over 20 °C (X4), the flow set
point will be a constant 2.5 m
3
/s.
1
2
3
4
2,5
3,0
-30 -20 -10 0 +10 +20
2,0
1,0
0,5
1,5