Operation manual of solar controller SR1568
Page 59 of 87
OTCO Tube collector function
This function is used for improving the switch-on behavior in systems with non-ideal sensor
positions (e. g. with some tube collectors).
This function operates within an adjusted time section. It activates the collector circuit pump
for an adjustable runtime between adjustable pauses in order to compensate for the delayed
temperature measurement.
If the runtime is set to more than 10s, the pump will be run at 100% for the first 10s of the
runtime. For the remaining runtime, the pump will be run at the adjusted minimum speed.
If the collector sensor is defective or the collector is blocked, this function is suppressed or
switched off.
In 2-collector fields systems, the tube collector function is available for each individual
collector field.
In 2-collector fields systems, the tube collector function will affect the inactive collector field
only. The solar pump of the active collector field will remain switched on until the switch-off
conditions are fulfilled.
PNMP Pump control
With this parameter, the relay control type can be adjusted. The following types can be
selected:
Adjustment for standard pump without speed control: On/OF : Pump on / pump off
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