415005 Topvex TR Operation and Maintenance Instructions
Topvex TR800, TR1300, TR1800, TR4000 Operation and Maintenance Instructions
Systemair Inc.
23
Free cooling is only activated when the following starting conditions are met
Starting conditions:
• Less than 4 days have passed since the unit was last in running mode
• The outdoor temperature during the previous running period exceeded a set limit (71.6°F (22 °C))
• It is between 00:00 and 07:00:00 in the day (settable)
• The timer outputs for normal speed, Extended running normal and External stop are Off
• The timer channel will be On sometime during the recently started 24 hours.
The unit checks the night temperature (indoor and outdoor temperature) during 3 minutes at the set starting
hour when the fans are started so that the sensors can perform a temperature measurement. If above
conditions are met the free cooling function is started, if not the unit goes back to OFF position.
If the outdoor sensor is not located in the outdoor air inlet duct and a room sensor has been selected, the
unit will not start free cooling as long as all the temperatures are not within the start and stop temperature
intervals.
Stop conditions:
• Outdoor temp above the set max value (64.4°F (18°C)) or below the set min value (condensation risk,
50°F (10°C))
.
• The room temp/extract air temp is below the set stop value (64.4°F (18°C))
.
• One of the timer outputs for normal speed, External stop or External running normal is On
• The time is later than 07:00:00.
When free cooling is active, the fans run at normal speed or the set value for pressure/ow control and the
digital output Free cooling is active. The outputs Y1-Heating, Y2-Heat exchanger and
Y3-Cooling are shut down. After free cooling has been activated, the heating output is blocked for 60
minutes (congurable time).
Note
The following is only valid if the free cooling function is set to Active in the program menu.
4.4 Free Cooling Description
This function is used during the warm period to save energy by using cold outdoor air, e.g. during night
time, to cool down the building.
→ Log off Log off
No
Actual
level: None
Log off from system level by
changing “No” to “Yes” with the
“OK” and “UP/DOWN” buttons
Automatic logoff after 6 minutes
of inactivity.
→ Change
password
Change password
for
level:None
New password
xxxx
Set a new password for the level
of your choice.
Can only be done once logged
on to the service level.