SystemAir SAVE VTR 300/B Installation Manual page 29

Off / On.
Cooling Control
• If the outdoor air is warmer than the extract air and the supply air is above the setpoint, cooling recovery occurs. This
condition blocks the heat regulation process. Activate or deactivate cooling recovery. Default setting is On.
Set cooling limit. Cooling recovery is allowed if extract air temperature is lower than outdoor air temperature by a set
limit (default setting is 2K) and cooling demand is present.
• Configure status, temperature and duration of free cooling. Activate or deactivate free cooling . Default setting is
Off.
Set supply and extract air fan levels during free cooling. Default setting is Normal. Range: Normal / High /
Maximum.
Set start condition. Outdoor daytime temperature for activation, default setting is 22°C. Range: 12–30°C.
Stat stop conditions. Extract/Room temperature, default setting is 18°C. Outdoor high temperature limit, default set-
ting is 23°C. Outdoor low temperature limit is 12°C. Start and stop time.
5.7.6.4.1Finding RPM for desired airflow
It is necessary to set fan RPM (revolutions per minute) for each airflow level to control airflow by changing fan speed.
Fan speed differ for each household because of different unit size, duct system and system pressure. In order to find
correct fan speed, external tool must be used at Systemair website.
1. Go to Systemair website and find your unit.
2. Go to Diagram tab and type in desired airflow values in l/s, m
sure drop in duct system (if this value is not know, type in 100 Pa for both supply and extract air)
3. See calculated speed values in revolutions per minute (rpm) for both supply and extract air in the table bellow
diagrams.
4. Use this procedure to find fan speed for all airflow levels: MINIMUM LEVEL, LOW LEVEL, NORMAL LEVEL, HIGH LEV-
EL, MAXIMUM LEVEL.
5. Finally in the control panel go to Service menu, enter the password, then go to Control Regulation → Fan
Control. Choose RPM as airflow type and in sub-menu Airflow Level Settings enter calculated fan speed val-
ues for each level.
5.7.6.5 User Modes
Set airflow level, duration and offset for each user mode.
Set supply and extract air fan levels, default duration and temperature offset where available for user modes:
• Away
• Central Vacuum Cleaner
• Cooker Hood
• Crowded
• Fireplace
• Holiday
• Refresh
| v01
3 /h, m
Fig. 7 Example of airflow and external pressure selection
Fig. 8 Example speed for supply and extract air
3 /s or cfm for supply and extract air. Input pres-
25
Configuration |