Zehnder EASY 5.0
67
When the anti-icing function is activated, the modulating bypass control is managed by specific PID parameters that are
different from the PID parameters that manage the recovery rate. This allows the dynamics of the actuator to be adapted
for this more constrained operating phase (need for greater responsiveness) in order to maintain the exchanger's air
temperature ≥+3°C.
■
The anti-icing sequence is independent of the heating, recovery, cooling and fresh air preheating sequences. It is also
used as a condition for activating the supply air volume reduction function (see
ANTI-ICING FUNCTION BY REDUCING THE SUPPLY AIR VOLUME).
The anti-icing function is activated when the exhaust temperature drops below +3°C and stops when the temperature
rises above +4°C. The anti-icing PID sets are used the whole time the function is active. This function has priority over
the heat recovery function and remains active for a minimum of 5 minutes from when it is activated, regardless of the
measured exhaust temperature.
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
VAS
VAR
Fresh air
Return air
Bypass
Exhaust temp.
Bypass temperature setpoint (exhaust)
time
Temperature setpoint
Anti-icing protection
10V
0V
+4°C
+3°C
Status of the analogue output for bypass actuator control
Plate heat exchanger exhaust air temperature
Max. heat recovery
No heat recovery
