MENU 7.1.10.2 - AUTO MODE SETTINGS
Start cooling
Setting range: 15 – 40 °C
Stop heating
Setting range: -20 – 40°C
Stop additional heat
Setting range: -25 – 40°C
Filtering time
Setting range: 0 – 48 h
Time between cooling and heating
Setting range: 0 – 48 h
Used as cooling/heating sensor
Possible options: None, Zone 1 - X
Set point value cool/heat sensor
Setting range: 5 – 40 °C
Heating at room sub temp
Setting range: 0.5 – 10.0 °C
Cooling at room over temp
Setting range: 0.5 – 10.0 °C
Auto: When the operating mode is set to "Auto",
SMO S40 selects when start and stop of additional heat
and cooling/heating production are permitted, depending
on the average outdoor temperature.
Stop heating, Stop additional heat: In this menu, you set
the temperatures that the system is to use for control
in auto mode.
Caution
It is not possible to set "Stop additional heat"
higher than "Stop heating".
In systems where heating and cooling share
the same pipes, "Stop heating" cannot be set
higher than "Start cooling" if there is no cool-
ing/heating sensor.
Filtering time
You can set the time over which the average outdoor
temperature is calculated. If you select 0, the current
outdoor temperature is used.
Time between cooling and heating
Here you can set how long SMO S40 is to wait before
it returns to heating mode when the cooling demand
has ceased or vice versa.
Used as cooling/heating sensor
Here you select the sensor that will be used for cool-
ing/heating. If BT74 is installed, it will be preselected
and no other option is possible.
Set point value cool/heat sensor
Here you can set at which indoor temperature SMO S40
is to shift between heating respectively cooling opera-
tion.
Heating at room sub temp
Here you can set how far the room temperature can
drop below the desired temperature before SMO S40
switches to heating operation.
Cooling at room over temp
Here you can set how high the room temperature can
increase above the desired temperature before
SMO S40 switches to cooling operation.
Cooling with room over temperature passive
Here you can set how high the room temperature can
increase above the desired temperature before
SMO S40 switches to cooling operation.
MENU 7.1.10.3 - DEGREE MINUTES SETTING
Current value
Setting range: -3,000 – 100 DM
Heating auto
Setting option: on/off
Start compressor
Setting range: -1,000 – (-30) DM
Stepping difference compressor
Setting range: 10 – 2,000 DM
Relative DM Start additional heat
Setting range: 100 – 2,000 DM
Difference between additional heat steps
Setting range: 10 – 1,000 DM
Cooling auto
Setting option: on/off
Start active cooling
Setting alternative: 10 – 300 DM
Degree minutes cooling
Setting alternative: -100 – 3,000 DM
DM = degree minutes
Degree minutes are a measurement of the current
heating requirement in the house and determine when
the compressor respectively additional heat will
start/stop.
NIBE SMO S40Chapter 9 | Control – Menus56
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