Defrost; External Dampers; Freecooling-Heating; Heating - LMF Clima LC2 Manual De Uso

6.5. Defrost

Defrost management is done by the exhaust air temperature sensor.

To enable a defrost strategy at least one of the following devices:

Mixing chamber

Electrical pre-heater
Inverter modulating fans
Mixing chamber can be combined with the electrical pre-heater.

(password) 1




(Heat exchanger defrost management)
0*=Off or Only Mix Chamber
1=Preheating
2=Modulating Fan

6.6. External dampers

External dampers are open when the unit is turned On
They are closed when the unit is turned Off with a delay from the fan stop

Moreover the dampers can be close in the following cases:
Unit stopped by alarm

Antifreeze active

Winter start-up (with mixing chamber)

6.7. Freecooling-heating

Free-cooling is disabled if fresh air temperature is lower than a set point (with an hysteresis)
Free-cooling is active when the fresh air temperature is lower than set point temperature – free-cooling differential
and the unit is in cooling mode
Free-heating is active when the fresh air temperature is higher than set point temperature + free-heating differential
and the unit is in heating mode

6.8. Heating

Heating is done by a 3 point valve or an electrical heater (depending on plant type).
Minimum water temperature
Hot valve is enabled if digital input DI1 (expansio n card) is close.
This alarm is automatically reset and activate the ge neral alarm output

Heating element

The heating element s activated by set point and a differential
The 3 point valve is regulated proportionally on th e set point
firmware 1.03
Electronic Control "LC2" User Manual
Rev.11
EN
EN 10/ 15