STIEBEL ELTRON SOM 10 - Manual (Page 46)

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Heat dump The heat dump function can be used to direct excess
heat generated by strong solar irradiation to an exter-
nal heat exchanger (e. g. fan coil) in order to prevent
the collectors from overheating.
The allocated relay is energized with 100%, if the col-
lector temperature reaches the adjusted switch-on
temperature. If the collector temperature falls by 5 K
below the adjusted collector overtemperature, the
relay will be switched off.
If one of the store temperatures exceeds its respecti-
ve maximum temperature by more than 5 K while the
heat dump function is active, the function is deactiva-
ted and an error message appears. If the store tem-
perature falls below the maximum store temperature
again, the heat dump function is released.
Note:
The switch-on collector temperature is blo-
cked against the emergency switch-off tem-
perature by 10 K [20 °Ra].
Adjustment channel Description Adjustment range / selection Factory setting
Relay Relay selection system dependent system dependent
Tcol. Switch-on collector temperature 40 ... 190 °C [104 ... 374 °F] 110 °C [230 °F]
Funct. Activation / Deactivation Activ., Deactivated Deactivated
Solar / Opt. functions / Add new function... / Heat dump
Relay
Flow rate monitoring The flow rate monitoring function can be used to de-
tect malfunctions that impede the flow rate and to
switch off the corresponding relay. This will prevent
system damage, e. g. through a dry run of the pump.
If the flow rate monitoring function is activated, an
error message will appear when no flow rate is de-
tected at the allocated flowmeter after the delay time
has passed. The store being loaded is blocked for any
further loading until the error message has been ac-
knowledged. The next store free for loading will be
loaded instead.
The error message will appear both in the Status /
Messages menu and in the optional function menu.
It can only be acknowledged in the optional function
menu. When the error message is acknowledged, the
controller runs a test during which it will energize the
relay and again monitor the flow rate.
Adjustment channel Description Adjustment range / selection Factory setting
Sensor Flow rate sensor selection Imp1 ... Imp3, Ga1, Ga2, Gd1, Gd2 Imp1
Ref. relay Reference relay selection system dependent system dependent
Store Sensor selection system dependent 1
Funct. Activation / Deactivation Activ., Deactivated Deactivated
Solar / Opt. functions / Add new function... / Flow rate mon.