STIEBEL ELTRON SOM 9s - Manual (Page 81)

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SOM 9s
evacuated tube collector function
COL / OTCO (1, 2)
Evacuated tube collector
function
Selection: ON / OFF
Factory setting: OFF
COL / OTCO (1, 2) / TCST
(1, 2)
Starting time
Adjustment range:
00:00 ... 23:00
Factory setting: 07:00
This function helps overcome the non-ideal sensor position
with some evacuated tube collectors.
This function operates within an adjusted time frame,
beginning at TCST and ending at TCen. It activates the
collector circuit pump for an adjustable runtime (TCRU)
between adjustable standstill intervals (TCIn) in order to
compensate for the delayed temperature measurement.
If the runtime TCRU is set to more than ten seconds, the
pump will be run at 100 % for the first 10 s of the runtime.
For the remaining runtime, the pump will be run at the
adjusted minimum speed nLO.
If the collector sensor is defective or the collector is blocked,
this function is suppressed or switched off.
COL / OTCO (1, 2) / TCIN (1, 2)
Standstill interval
Adjustment range: 5 ... 60 min
in steps of 00:01
Factory setting: 30 min
note:
If the drainback option ODB is activated, the
evacuated tube collector function OTCO will
not be available.
COL / OTCO (1, 2) / TCEN (1, 2)
Ending time
Adjustment range:
00:30 ... 23:30
in steps of 00:30
Factory setting: 19:00
COL / OTCO (1, 2) / TCRU (1, 2)
Runtime
Adjustment range: 30 ... 300 s
in steps of 5 s
Factory setting 30 s
2-collector systems
In 2-collector systems, the evacuated tube collector function
is available for each collector field (OTCO2).
If one of the collector fields is being loaded, the heat transfer
fluid flows through the inactive field and only the correspon-
ding relay is energized.
Multi-tank systems
If the evacuated tube collector function is activated, the
speed of the solar pump will decrease to nLO during the
loading break time. The solar loading of the subordinate
tank will continue.
In 2-collector systems, during the loading break time the
collector field which has been active before the loading
break time remains active during the loading break time,
unless the evacuated tube collector function of the inactive
field becomes active.