STIEBEL ELTRON SOM 10 User Manual

Page 45

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

Ref. relay

Reference relay selection

system dependent

Runtime

Pump runtime

1 ... 48 h

6 h

Flow rate mon.

Flow rate monitoring option

Yes, 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