STIEBEL ELTRON SOM 7 SI - Manual (Page 19)

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SOM 7 SI
The controller checks the tanks regarding loading facilities
(switch-on difference). If the priority tank cannot be loaded,
the lower-ranking tank is checked. If the lower-ranking tank
can be charged this is effected by the so-called “oscilating
charge time” (tRUN).When the oscillating charge time is
over the loading is stopped. The controller regulates the
increase of the collector temperature. If it increases by the
collector rising temperature (
∆T-Col 4°F, fixed software
value), the expired break time is again reset to zero and the
oscillating break time starts again. If the switch-on conditions
of the priority tank are not reached, the loading of the
lower-ranking tank is continued. If the priority switch has
reached its maximum temperature, the oscillating charge is
not effected.
Oscillating Break Time/Oscillating Charge Time/
Collector Rising Temperature
4.1.17 Tube collector special function
4.1.16 Recooling function
4.1.15 Oscillating Charge
Respective Adjustment Values:
Factory setting Adjustment range
Priority [PRIO] (1 / Arr 5,6) (2 / Arr 4) 0-2
Oscillating Break Time [tST] 2 min. 1-30 min.
Oscillating Charge Time [tRUN] 15 min. 1-30 min.
SOM 7 SI Priority Logic The above oscillating charge parameters are only available
in multi-tank or layered charge systems (Arr 4, 5 and
6). If Tank Priority is set to 0, the tanks which show a
temperature difference towards the collector are loaded in
numerical order (tank 1 or tank 2). Usually only one tank
is loaded at this point. For Arr= 5, 6 parallel loading is also
possible.
Tank Priority:
This setting is designed to be used in conjunction with the
System Cooling Function, which overrides the maximum
store temperature (S MX, S1MX, S2MX) when used.
This function will cool the tank back down to its maximum
temperature when the collector temperature becomes
low enough to facilitate such. This prevents a cumulative
overheating condition if the cooling function needs to be
used multiple days in a row. In order to utilize this function
with tube collectors, a heat rejection loop (heat dump) is
necessary.
If the controller measures an increase of 4 °F compared to
the collector temperature which was last stored, the solar
pump is switched-on for about 30 seconds. After the solar
pump is deactivated the current collector temperature is
stored as new reference value. If the measured temperature
(new reference value) is again exceeded by 4 °F, the solar
pump again switches-on for 30 seconds. If the switch-on
differential is reached during any of these processes the
controller automatically switches over to solar charging.
If the collector temperature drops by 4 °F while the system
fluid is stagnant, the switch-on value for the special tube
collector function will be recalculated.
OREC:
Recooling Option
adjustment range
OFF / ON
Factory setting: OFF
O TC:
Tube Collector Function
Adjustment range:
OFF / ON
Factory setting: OFF