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4.1.10 System cooling
CMX:
Maximum collector temp.
Adjustment range
210 ... 380 °F
Factory setting 250 °F
If the adjusted maximum tank temperature is reached, the
solar system switches-off. If now the collector temperature
raises to the adjusted maximum collector temperature
(CMX), the solar pump remains activated until this limit
temperature value is again underrun. The tank tempe rature
might continue to raise (subordinated active maximum
tank temperature), but only until 203 °F (emergency shut-
down of the tank). If the tank tempe rature is higher than
the maximum tank temperature (S MX) and the collector
temperature is lower by at least 5 K than the tank tempe-
rature, the solar system remains activated until the tank is
again cooled down by the collector and the tubes under the
adjusted maximum temperature (S MX).
In case of active system cooling on the display is shown
(flashing). Due to the cooling function the solar system can
be kept operable for a longer period on hot summer days
and a thermal release of the collector and the heat transfer
medium is ensured as well.
OCX:
Option system cooling
Adjustment OFF ... ON
Factory setting ON
4.1.11 Option minimum collector limitation
CMN:
Minimum collector tempera-
ture Adjustment range
14 ... 32 °F
Factory setting 50 °F
OCN:
Mimimum collector limitation
Adjustment range OFF / ON
Factory setting OFF
The minimum collector temperature is a minimum switching
temperature, which must be exceeded so that the solar
pump (R1/R2) is switched-on. The minimum temperature
shall avoid a steady starting-up of the solar pump (or solid
fuel boiler charging pumps) for low collector temperatures.
If the minimum temperature is underrun, in the display is
shown (flashing).
4.1.13 Recooling function
4.1.12 Option antifreeze function
CFR:
Antifreeze temperature
Adjustment range
14 ... 50 °F
Factory setting 40 °F
OCF:
Antifreeze function
Adjustment range
OFF / ON
Factory setting OFF
The antifreeze function activates the loading circuit bet-
ween collector and tank if the adjusted antifreeze function
is underrun in order to protect the medium that it will not
freeze or „get thick“. If the adjusted 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.
If the adjusted maximum tank temperature (S MX)
is reached, the solar pump remains activated in order
to avoid an overheating of the collector. The tank
temperature might continue to increase but only up to
203 °F (emergency shutdown of the tank).
In the evening the solar system continues running until
the tank is cooled down to the adjusted maximum tank
temperature via collector and pipes.
OREC:
option recooling
adjustment range
OFF ... ON
Factory setting: OFF
