PAW SC5.14, Manual, Page: 42 / 80

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Twin pump
Solar / Opt. functions / Add new function... / Twin pump
Adjustment
channel
Description
Adjustment range /
selection
Factory setting
Relay Relay selection system dependent system dependent
Reference 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, Flowrotor Imp1
Delay Delay time 1 … 10 min 5 min
Funct. Activation / Deactivation Activated, Deactivated Deactivated
The Twin pump function controls the equal distribution of pump runtime in sys-
tems with 2 equally usable pumps.
If the allocated relay has exceeded its adjusted runtime and the next switch-on
process is imminent, the reference relay is switched on instead. All characteristics
are adopted.
If the reference relay has in turn exceeded its runtime as well, the fi 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 fl ow rate error. When the fl ow rate monitoring op-
tion is activated, two additional adjustment channels appear for allocating a sensor
and adjusting a delay time.
If the fl ow rate monitoring option is activated, an error message will appear when
no fl ow rate is detected at the allocated sensor after the Delay time has passed.
The active relay is considered as defective and will be blocked until the error mes-
sage has been acknowledged. 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 controller runs a test during which
it will energise the relay and again monitor the fl ow rate.
Relais Bezugsrelais
Exemplary fi gure of twin pumps in the solar fl ow with upstream fl owmeter
Heat dump
Solar / Opt. functions / Add new function / Heat dump
Adjustment
channel
Description
Adjustment range /
selection
Factory setting
Relay Relay selection system dependent system dependent
Variant
Variant (pump or valve
logic)
Valve, Pump Valve
Tcol.
Switch-on collector tem-
perature
40 … 190 °C 110 °C
Funct. Activation / Deactivation Activated, Deactivated Activated
Note:
The switch-on collector temperature must be adjusted at least by 10 K
lower than the emergency switch-off temperature.
Relay Reference relay