English
7
SysAer
3. ROOM AIR TEMPERATURE CONTROL
Room temperature is regulated with following devices:
²
Compressors,
²
Additional heating
hot water coil
electric coil
gas burne
²
Economizer: 2 or 3 dampers
²
Energy recovery system
2 set points can be managed, one for summer mode and one for winter mode.
3.1. SUMMER/WINTER SWITCHING
3.2. UNIT ON/OFF
To transition from summer mode to winter mode (and vice versa), proceed as follows:
1.
From the display with Summer/Winter facility (optional)
Press "PRG" key to enter to the main menu - select Summer/Winter and press ENTER. Pressing the
ENTER key, you switch between summer and winter. The unit must be OFF beforehand..
2.
From remote switching via digital input ID3 and terminal 24V
²
Contact open: summer mode
²
Contact closed: winter mode
3.
From automatic changeover, based on room air temperature
The unit switches from summer to winter mode or vice versa depending on the room air
temperature.
²
RAT > summer setpoint and RAT > winter se Auto change differential => summer mode
²
RAT < winter setpoint and RAT < summer setpoint – Auto change differential => winter mode
A differential is used to avoid constant summer
winter switching. Moreover, automatic
changeover can change the mode only one time each 30 minutes.
4.
From PC Supervisor (if selected)
5.
From PLAN network if the unit is configured as slave
The unit can be switched ON/OFF, by priority order, as follows:
1.
From the display with ON/OFF unit facility
2.
From remote ON/OFF digital input (ID5) (if active)
3.
From daily and/or weekly scheduling (if active, see the related part)
4.
From PC Supervisor program (if connected and active)
5.
From PLAN (if Plan active, see the related part)
IMPORTANT: All the ON/OFF active conditions must be switched ON to turn the unit ON. If one of these
conditions is OFF, the unit is turned OFF.
NB
.: It is possible to configure via the Service menu if the unit must start after a random time (60s max), to
avoid start-up current peaks. After a power failure or a switch ON, the unit will wait a random time before
starting the main blower.
