USDT 3002
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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. At this point 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
temperature might continue to raise, but only until 203 °F
(emergency shutdown of the tank). If the tank temperature
is higher than the maximum tank temperature (
S MX
) and
the collector temperature is lower by at least 5 K than the
tank temperature, 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 OFF
4.1.11 Minimum collector temperature option
CMN
:
Minimum collector tempera-
ture Adjustment range
14 ... 32 °F
Factory setting 50 °F
OCN:
Adjustment range OFF / ON
Factory setting OFF
The minimum collector temperature 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 Antifreeze function option
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. The adjusted antifreeze function is
underrun in order to protect the medium from freezing or
thickening. If the adjusted antifreeze temperature is excee-
ded by 2 °F, the loading circuit will be deactivated.
Note:
As there is only a limited amount of heat in the tank 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:
Recooling
adjustment range
OFF ... ON
Factory setting: OFF
