Regulation Logic; On-Off Managment; Cooling / Heating Mode Changeover; Mixing Chamber - LMF Clima LC2 Manual De Uso

6.1. On-Off managment

The unit can be turned On-Off in the following way:


Off by digital input, main priority
Off by Remote keyboard:
1) While weekly program is not active, the unit is definitively On/Off
2) While weekly program is active, the unit can be temporarily turned On/Off till next event (in case of this the
active profile led blinks)
The set point is the same of the last time range.

In case of blackout the unit restarts with the time range status

Off by BMS via MODBUS
Off by weekly program

6.2. Cooling / heating mode changeover


Cooling / heating mode can be switched by:

Digital input

Remote Keyboard

BMS via MODBUS
Automatically with fresh air sensor
If Te <  = Heating mode
If Te > + = Cooling mode

(password) 1



Fresh air temperature set point for automatic changeover

Season changeover differential

6.3. Mixing chamber

When a mixing box is present on the unit it is necessary to enable the parameter
be activated in the following cases:

During winter start-up for a set period (Parameter

During the heat exchanger defrost if managed by mixing chamber (parameter

6.4. Water coil antifreeze

Alarm and error active only in heating mode, if electric preheater is installed on the unit it is activate for a set period
to try to increase the temperature before entering in alarm condition.
When the antifreeze alarm is active the fans are Off, the dampers closed, the 3 point valve opened and the pumps are
active.

In case of antifreeze sensor fault:

When the unit is in stan-by the valves opens in the fresh air temperature is lower than antifreeze set point
When the unit is On the antifreeze is managed using the supply air temperature
firmware 1.03
Electronic Control "LC2" User Manual

6 Regulation Logic

Heating
Te = fresh air sensor
Rev.11


15.0°C
10.0°C


)
Cooling
Te
; recirculation of return air will

)
EN 9/ 15
EN