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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 cha-
racteristics are adopted.
If the reference relay has in turn exceeded its run-
time as well, the rst 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 ow rate error. When the ow rate mo-
nitoring option is activated, two additional adjust-
ment channels appear for allocating a sensor and
adjusting a delay time.
If the ow rate monitoring option is activated, an
error message will appear when no ow rate is de-
tected at the allocated sensor after the Delay time
has passed. The active relay is considered as defec-
tive and will be blocked until the error message has
been acknowledged. The second relay will be activa-
ted 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 energise the
relay and again monitor the ow 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
295931-36390-8667 SOM 8 plus_en.indb 45 20.10.2011 13:14:41
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