GB.COMPACTAHSK.210520
Registered design. The company reserves the right to make design changes without prior notice.
www.swegon.com 19
9.2.1.1 ERS Regulation
ERS regulation means Extract air temperature-Related
Supply air temperature regulation. This means that the
temperature of the supply air is regulated in relation to the
temperature of the extract air. Under normal circumstanc-
es, the supply air temperature is regulated to be a few de-
grees lower than the extract air temperature. In this way,
the heat exchanger will provide optimal performance, and
this means excellent operating economy. ERS regulation is
suitable for use when there is excess heat in the premises
generated, for example, by machinery, lighting or people
and the supply air devices in the premises are suitable for
diffusing air below room temperature.
ERS REGULATION 1
The control unit regulates the relationship between the
supply air and extract air temperatures according to a fac-
tory-preset curve.
See the chart to the right.
The steps, breakpoint and EA/SA differential plotted in
the curve can be changed at USER LEVEL under TEMPERA-
TURE/SETTINGS.
Settings:
Value
Setting
Factory
range
setting
Step
1 – 3
1
Breakpoint
15-23 °C
20 °C
(refers to extract air temp.)
EA/SA-Differential
1-5 °C
2 °C
The setting range for the Break Point and EA/SA differ-
ence is limited by Min. and Max. settings at
INSTALLATION
LEVEL under CONTROL DISPLAY
.
ERS REGULATION 2
This is used when special needs and conditions are such
that the factory preset ERS regulation 1 curve cannot pro-
vide the results required. Conditional on which settings are
made, it may be necessary to install a post-heating coil.
An individually adapted curve regulates the relationship
between the supply air and extract air temperature.
See the chart to the right.
The following settings are possible at USER LEVEL under
TEMPERATURE/SETTINGS:
Value
Setting
Factory
range setting
Extract air temperature
X1 10-38 °C 15 °C
X2 11-39 °C 20 °C
X3 12-40 °C 22 °C
Supply air temperature setpoint
Y1 10-40 °C 20 °C
Y2 10-40 °C 18 °C
Y3 10-40 °C 14 °C
The setpoint displacement and summer night cooling
functions can also affect the preset temperatures.
Factory setting means:
If the extract air temperature is below 20 °C (breakpoint),
the supply air temperature setpoint will be automatically
regulated to be 2 °C (EA/SA differential) lower.
If the extract air temperature is above 20 °C, the supply
air temperature setpoint will follow the curve according to
Step 1.
Breakpoints according to factory setting means:
If the extract air temperature is below 15 °C (X1) the set-
point for supply air temperature is constant 20 °C (Y1).
If the extract air temperature is 20 °C (X2) the supply air
temperature set point will be 18 °C (Y2).
If the extract air temperature is above 22 °C (X3), the sup-
ply air temperature setpoint will be constantly 14 °C (Y3).
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
15
16
17
18
19
20
21
22
23
24
14
Supply air temperature setpoint
°
C
Extract air temperature °C
Step 3
Step 2
Step 1
ERS regulation 1
1
2
3
15
20
22
9
10
12
15
20
25
27
X = Extract air temperature °C
Y = Setpoint supply air temperature °C
ERS regulation 2
