40
en
Relais
Bezugsrelais
Reference
relay
Relay
Exemplary fi gure of twin pumps with upstream fl owmeter
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 characteris-
tics 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 acti-
vate the twin pump in the case of a fl ow rate error. When the fl ow rate monitoring
option is activated, 2 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 elapsed.
The active relay will be blocked as defective and the second relay will be activated
instead. The twin pump function will pause until the error message has been ac-
knowledged.
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.
In a drainback system, the heat transfer fl uid will fl ow into a holding tank if solar
loading does not take place. The drainback option initiates the fi lling process if
solar loading is about to start. If the drainback option is activated, the following
adjustment can be made:
Note:
A drainback system requires additional components such as a holding
tank. The drainback option should only be activated if all components
required are properly installed.
The fi lling time can be adjusted using the parameter Filling time. During this
period, the pump runs at 100 % speed.
The parameter Stab. time is used for adjusting the time period during which the
switch-off condition will be ignored after the fi lling time has ended.
The parameter Initialis. is used for adjusting the time period during which the
switch-off condition will be ignored after the fi lling time has ended.
The Booster option is used for switching on a second pump when fi lling the solar
system. The corresponding relay is switched on at 100 % speed for the duration of
the fi lling time.
A short time (Delay time) after the system has been emptied, the Drain impulse
option will switch on the solar pump for an adjustable Duration. Thus, a hydro-
static head will form in the fl ow pipe. When it falls back into the holding tank, water
pockets remaining in the collector will be sucked down into the holding tank.
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
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
Imp.1, Gd1, Gd2
-
Delay
Delay time
1 … 10 min
5 min
Funct.
Activation / Deactivation
Activated, Deactivated Deactivated
Summary of Contents for BW/H Komfort HE
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