STIEBEL ELTRON SOM 9s - Manual (Page 80)

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SOM 9s
Collector emergency shutdown
When the collector temperature exceeds the adjusted coll-
ector emergency temperature (CeM / CeM1 / CeM2), the
solar pump (R1 / R2) is switched off in order to protect the
system components against overheating (collector emer-
gency shutdown). If the maximum collector temperature is
exceeded, is displayed (flashing).
COL(1,2) / CEM(1,2)
Collector emergency
temperature
Adjustment range: 170 ... 390 °F
in steps of 2 °F
Factory setting: 270 °F
Switch-on hysteresis: -10 °R
note:
If the drainback option ODB is activated, the
adjustment range of the collector emergency
temperature is changed to 170 ... 200 °F. Factory
setting in that case is 200 °F.
COL (1,2) / OCCO(1,2) /
CMAX(1,2)
Collector maximum temp.
Adjustment range: 150 ... 320 °F
in steps of 2 °F
Factory setting: 230 °F
Switch-on hysteresis: -10 °R
Collector cooling
This function is used for keeping the system temperatures
and consequently the thermal load as low as possible.
When the tank temperature exceeds the adjusted maximum
tank temperature, the system stagnates. If the collector
temperature increases to the adjusted maximum collector
temperature, the solar pump is activated until the collector
temperature falls below the maximum collector tempera-
ture. The tank temperature may then exceed the maximum
temperature, but only up to 200 °F (emergency shutdown
of the tank).
If the collector cooling is active, is displayed (flashing).
COL(1,2) / OCCO(1,2)
Adjustment range ON / OFF
Factory setting: OFF
note:
This function is only available, if the system
cooling function and the heat dump function
are deactivated.
COL (1,2) / OCMI(1,2) /
CMIN(1,2)
Collector minimum temp.
Adjustment range: 50 ... 190 °F
in steps of 2 °F
Factory setting: 50 °F
Minimum collector limitation
COL(1,2) / OCMI(1,2)
Collector minimum temp.
Adjustment range: ON / OFF
Factory setting: OFF
The minimum collector temperature is the minimum switch-
on temperature which must be exceeded for the solar pump
(R1 / R2) to switch on. The minimum temperature prevents
the pump from being switched on too often at low collector
temperatures. If the collector temperature falls below the
adjusted minimum temperature, is displayed (flashing).
WARnIng! Danger of injury and system da-
mage through pressure surges!
If water is used as a heat transfer
medium in a pressure-less system, the
water will start boiling at 212 °F
Î If a pressure-less drainback
system is used with water as a
heat transfer medium, do not
adjust the collector tempera-
ture limitation CeM to more
than 200 °F