STIEBEL ELTRON SOM 6 SI - Manual (Page 11)

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SOM 6 SI
3.1.8 Maximum Store Temperature
If the adjusted maximum temperature is exceeded, a further
loading of the store is stopped so that a damaging overheating
can be avoided. If the maximum store temperature is
exceeded, the symbol is displayed.
Please note: The controller is equipped with a security-
switch-off of the storage tank, which will not allow further
loading of the tank if it reaches 205 °F.
S MX:
Maximum Storage Tank
Temperature
Adjustment range:
40 - 205 °F
Factory setting 140 °F
CMX:
Maximum Collector
Temperature
Adjustment range:
210 - 380 °F
Factory setting 250 °F
3.1.10 System Cooling Functions.
The system cooling function is used to prevent the system‘s
heat exchanger fluid from overheating. This in turn prevents
the degradation of the fluid‘s corrosion inhibitors avoiding
damage to the system components. If the system cooling
function is activated the symbol is flashing.
If the maximum collector temperature is reached the maxi-
mum storage tank temperature is overridden and the sys-
tem‘s circulator pump is turned on, cooling the system‘s HX
fluid using the water in the storage tank. This will continue
until either the collector temperature is measured to be at
least 9 °F lower than the setting of “CMX”, the tank reaches
it’s 205 °F security-switch-off temperature, or the collector
reaches its collector emergency shutdown temperature. The
last two instances should not occur if the system is sized
and configured properly.
OCX:
System Cooling
Adjustment range OFF/ON
Factory setting OFF
3.1.9 Collector Emergency Shutdown
Temperature
If the collector emergency shutdown temperature (EM)
is reached, the solar pump (R1) is deactivated in order to
avoid damaging the solar components. The default setting is
285 °F. If the system is in emergency shutdown mode the
symbol
is flashing. The system will not exit this mode
until the temperature measured is 30 °F lower than the
value of this setting.
EM: Collector Emergency
Shutdown Temperature
Adjustment range
230 - 400 °F,
Factory setting 285 °F
CMN: Collector Minimum
Temperature
Adjustment range 50 - 195°F
Factory setting 50°F
3.1.11 Minimum Collector Temperature Limit
OCN: Collector Minimum
Temperature Limitation
Adjustment range OFF/ON
Factory setting OFF The minimum collector temperature is a temperature which
must be exceeded in order for the solar pump (R1) to be
switched-on. The minimum temperature setting is used to
avoid starting-up the solar pump (or solid fuel boiler charging
pumps) when the temperature of the heat exchanger fluid
is too low. If the minimum temperature feature is activated
the symbol is shown on the display (blinking).
CFR:
Antifreeze Temperature
Adjustment range 15 - 50°F
Factory setting 40°F
3.1.13 Antifreeze Function
OCF:
Antifreeze Function
Adjustment range OFF/ON
Factory setting OFF The antifreeze function activates the loading circuit between
collector and tank if the antifreeze temperature is reached
in order to protect the heat exchanger fluid against freezing
or “thickening“. If the antifreeze temperature is exceeded
by 2°F, the loading circuit will be deactivated.
Please note:
As there is only a limited heat quantity of the tank available
for this function, the antifreeze function should only be used
in regions with few days of temperatures around freezing
point.