STIEBEL ELTRON SOM 10 - Manual (Page 45)

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Twin pump The Twin pump function controls the equal distri-
bution of pump runtime in systems with two equally
usable pumps.
If the allocated relay has exceeded its adjusted run-
time and the next switch-on process is imminent, the
reference relay is switched on instead. All characteris-
tics are adopted.
If the reference relay has in turn exceeded its runtime
as well, the first relay is switched on again in the next
switch-on process.
Additionally, the Flow rate monitoring option can
be activated in order to activate the twin pump in the
case of a flow rate error. When the flow rate moni-
toring option is activated, two additional adjustment
channels appear for allocating a sensor and adjusting
a delay time.
If the flow rate monitoring option is activated, an er-
ror message will appear when no flow rate is detec-
ted at the allocated sensor after the Delay time has
passed. The active relay is considered as defective and
will be blocked until the error message has been ack-
nowledged. The second relay will be activated instead.
The twin pump function will pause until the error
message has been acknowledged.
When the error message is acknowledged, the con-
troller runs a test during which it will energize the
relay and again monitor the flow rate.
Adjustment channel Description Adjustment range / selection Factory setting
Relay Relay selection system dependent system dependent
Ref. relay Reference relay selection system dependent system dependent
Runtime Pump runtime 1 ... 48 h 6 h
Flow rate mon. Flow rate monitoring option Yes, No No
Flow rate sen. Flow rate sensor selection Imp1 ... Imp3, Ga1, Ga2, Gd1, Gd2 Imp1
Delay Delay time 1 ... 10 min 5 min
Funct. Activation / Deactivation Activ., Deactivated Deactivated
Solar / Opt. functions / Add new function... / Twin pump
relay reference relay
Exemplary figure of twin pumps in the solar flow
with upstream flowmeter