STIEBEL ELTRON SOM 7 SI - Manual (Page 21)

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SOM 7 SI
4.2 Recommended Settings for any System Scheme
Below is a list of important settings which must be changed from their default value no matter what system
scheme (Arr. 1 - Arr. 9) is being used. Any time the system scheme is changed these values need to be
reset to the below values. If this is not done there is a very good chance that the system will overheat and
thus be in need of time consuming and possibly costly repairs.
Display
Code
Parameter Name
and Reference
Recommended Setting and Explanation
(All temperatures in °F)
EM
Collector Emergency
Shutdown Temperature
(p. 18)
310° This prevents the HX fluid directly behind that in the
sensor well from causing the system to go into emergency
shutdown mode as soon as the cooling function is activated.
OCX
System Cooling
Function (p. 18) On Failure to change this option to ‘on’ will likely result in
overheating of the system at some point.
CMX
Maximum Collector
Temperature (p. 18)
230° Having a relatively large ΔT between CMX and EM
prevents the HX fluid directly behind that in the sensor well
from causing the system to go into emergency shutdown mode
as soon as the cooling function is activated.
OREC
Recooling Function
(p. 19)
On This prevents a cumulative overheating of the system by
ensuring a relatively high
Δt between the tank temperature and
and the security switch-off of the tank (205°).
Below is a list of the recommended switch-on and switch-off settings for the controller. These options are
available on all 9 system schemes. These settings also need to be reset to the below values whenever the
system scheme (Arr. 1 - Arr. 9) is changed. Advanced users may want to set these differently depending on
the circumstances.
Display
Code
Parameter Name
and Reference
Recommended Setting and Explanation
(All temperatures in °F)
DT O
Switch on Temperature
Difference (p. 17)
15° Setting this too low can cause the circulator to cycle on and
off too frequently.
DT F
Switch off Temperature
Difference (p. 17)
5° Too high of a ΔT between DT O and DT F can cause the
circulator to switch on and off too frequently.