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Access 4.x |
Configuring sectional defrosting |
Configuration of the sectional defrosting |
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Variable |
Available options & Selection |
Note |
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Sequence selection |
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Configuration > Functions > Function activation > Heating/Cooling sequence setup |
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Sequence for exchanger |
...| SEQ-B Exchanger |… |
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Sequence settings |
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Configuration > Functions > Function activation > Heating/Cooling sequence setup > Exchanger |
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Type of sequence |
... | Exchanger | … |
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Type of exchanger |
| Rotary | Plate | Liquid | |
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Type of defrosting |
...| Sectional defrosting | ... |
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Defrosting configuration |
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Configuration > Functions > Temperature control > Sectional defrosting |
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Temperature sensor |
| Defrosting sensor | Exhaust air temperature | |
Temperature to monitor |
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Defrosting constant (B) |
[1.40] |
Value describing the exchanger's properties |
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Allow fan stop defrosting if exchanger pressure > max limit |
| No | Yes | |
Activate fan defrosting (Stop Supply air fan) |
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Extract air fan speed when fan defrosting |
| Auto | Low | Normal | High | |
Switch level of the extract air fan if fan defrosting is active |
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Automatic calibration |
| Off | Auto | |
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Max setpoint deviation extract air fan when auto calibration |
[10] % |
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Manual calibration |
| Off | On | |
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Actual calibration pressure exchanger extract |
___ Pa |
The latest values of the exchanger's pressure drop / airflow calibration |
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Calibration flow extract |
___ m3/h |
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Allocate analog inputs |
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Configuration > I/O allocation settings > Analog inputs |
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Flow extract air |
Any available I/O |
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Pressure exchanger extract air |
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PID Settings |
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Configuration > PID controllers > Defrosting |
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P-band |
[16] oC |
PID settings for defrosting controller |
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I-time |
[240] s |
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D-time |
[0] s |
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Defrost operational settings |
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Data & Settings > Temperature control > Exchanger > Defrosting pressure monitoring |
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Setpoint min limit |
[-3] oC |
Defrosting starts when the exhaust (defrosting) temperature is < -3 oC and will continue until it becomes +1 oC (-3 oC + 4 oC). |
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Hysteresis to end defrosting |
[4] oC |
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Max allowed deviation exchanger pressure when defrosting |
[100] % |
Activate fan defrosting (Stop Supply air fan) if the pressure drop over exchanger increases more than 100 % of the calibrated value |
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Max deviation exchanger pressure to start defrosting (SPavf) |
[25] % |
Defrosting is activated if pressure drop over the heat exchanger is more than 25% higher (compared to the calibrated value) longer than delay time |
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Hysteresis to end defrosting (SPhys) |
[60] % |
Defrosting is deactivated at least 60% of the initial exchanger's air permeability is restored longer than the delay time |
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Delay for pressure limits |
[10] s |
Delay time for activation and deactivation of the defrosting |
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Max time in fan stop defrosting mode |
[20] min |
AL-66 Defrosting alarm is triggered if SAF stop defrosting is active for longer than 20 minutes |
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