The operating action of the control output Y2 can be reversed.
The default setting is a heat recovery capacity of 0 to 100 % which corresponds to a control
signal from 0 to 10 V. By activating the function block Fb22, the operating action is re-
versed: HRU capacity 0 to 100 % then corresponds to 10 to 0 V.
If the measured outdoor temperature and exhaust air temperature are available, the
auto-
matic reversal of the operating action
for the heat recovery unit can be activated with
Fb41 = ON.
Functions
WE
Configuration
Operating action Y2
OFF
Fb22
Automatic reversal of the operating action
OFF
Fb41
Parameters
WE
Range of values
K
P
HRU
0.5
0.1 to 99.9
T
N
HRU
60 sec 1 to 999 sec
T
V
HRU
– – –
– – – to 999 sec
5.4.4 Cooling coil
The cooling coil is controlled from the control output Y3. It is implemented by a PID control
algorithm with the parameters K
P
Cooling coil, T
N
Cooling coil and T
V
Cooling coil. In the
system code numbers 6, 8 and 9, the demands made by the humidity control loop for hu-
midifying or the temperature control loop for cooling are converted internally into one com-
mon control signal Y3 for the cooling coil. The operating action of the control output Y3 can
be reversed. The default setting is a cooling capacity of 0 to 100 % which corresponds to a
control signal from 0 to 10 V.
By activating the function block Fb23, the operating action is reversed: the cooling capacity
0 to 100 % then corresponds to 10 to 0 V.
EB 5477 EN
49
Control methods and system components
Fig. 18 · Output signals, e.g. in system code number 6 (humidifier only)
Control
signal
Control variable