Nibe SMO 40 User Manual page 42

cool/heat sensor
If a single room is to determine how the whole installation will work, a cool-
ing/heating sensor (BT74) is connected to SMO 40. This sensor determines
when it is time to switch between cooling and heating operation for the whole
installation.
Caution
When the heating/cooling sensors (BT74) have been connected and
activated in menu 5.4, no other sensor can be selected in menu 1.9.5.
set pt value cool/heat sensor
Here you can set at which indoor temperature SMO 40 is to shift between
heating respectively cooling operation.
heat at room under temp.
Here you can set how far the room temperature can drop below the desired
temperature before SMO 40 switches to heating operation.
cool at room over temp.
Here you can set how high the room temperature can increase above the desired
temperature before SMO 40 switches to cooling operation.
larm rumsgivare kyla
This is where you set whether SMO 40 is to initiate an alarm if the room sensor
is disconnected or breaks during cooling operation.
start active cooling
Here you can set when active cooling is to start.
Degree minutes are a measurement of the current heating demand in the house
and determine when the compressor, cooling operation respectively additional
heat will start/stop.
step difference compressors
Caution
This setting option only appears if cooling is activated in menu 5.2.4.
The degree minute difference for controlling when the next compressor is to
start is set here.
42 Chapter 3 | SMO 40 – at your service NIBE SMO 40