Resol DeltaSol AL E Manuel page 30

The collector minimum limitation option prevents the
solar pump from being switched on too often at low
collector temperatures. When this option is activated,
the collector minimum temperature can be adjusted.
The collector minimum temperature is the tempera-
ture which must be exceeded for the solar pump (R1)
to switch on. If the temperature falls below the mini-
mum temperature, (flashing) is shown.
Antifreeze option
OCFR:
Antifreeze function
Selection: OFF/ON
Factory setting: OFF
CFRO:
Antifreeze switch-on
temperature
Adjustment range:
-40...+8 °C
-40 ... +46 [°F]
Factory setting:
4.0 °C; 40 [°F]
CFRF:
Antifreeze switch-off
temperature
Adjustment range:
-39...+9 °C
-39 ... 48 [°F]
Factory setting:
6,0 °C; 42 [°F]
Note:
Since this function uses the limited heat
quantity of the store, the antifreeze function
should be used in regions with few days of
temperatures around the freezing point.
30
The antifreeze function activates the loading circuit
between the collector and the store when the tempe-
rature falls below the adjusted temperature CFRO.
This will protect the fluid against freezing or coagula-
ting. If CFRF is exceeded, the solar pump will be swit-
ched off again.
The antifreeze function will be suppressed if the store
temperature falls below 5 °C.
Note:
This function can only become active if the
store temperature is higher than the collec-
tor temperature.
Store cooling
OSTC:
Option store cooling
Selection: OFF/ON
Factory setting: OFF
When the store cooling function is activated, the
controller aims to cool down the store during the
night in order to prepare it for solar loading on the
following day. If the adjusted maximum store tempera-
ture (SMAX) is exceeded and the collector tempera-
ture falls below the store temperature, the system will
be reactivated in order to cool down the store until
the store temperature falls below the maximum store
temperature by 2 K (4 °Ra).
Reference temperature differences are DT O and
DT F.
Tube collector function
O TC:
Tube collector function
Adjustment range:
OFF/ON
Factory setting: OFF
This function helps overcome the non-ideal sensor
position with some tube collectors.
If the controller detects an increase in collector tem-
perature by 2 K (4 °Ra) compared to the previously
stored collector temperature, the solar pump will be
switched on for about 30 s in order to detect the
fluid temperature. The current collector temperature
will be saved as a new reference value. If the measu-
red temperature (new reference value) is exceeded
by 2 K (4 °Ra), the solar pump will run for 30 s. If
the switch-on difference between the collector and
the store is exceeded during the runtime of the solar
pump, the controller will automatically switch to solar
loading.
If the collector temperature decreases by 2 K (4 °Ra)
during a loading break, the switch-on value for the
tube collector function will be recalculated.
Thermostat function for afterheating
AH O:
Thermostat switch-on
temperature
Adjustment range:
0...95 °C
30 ... 200 [°F]
Factory setting:
40 °C; 110 [°F]
AH F:
Thermostat switch-off
temperature
Adjustment range:
0...95 °C
30 ... 200 [°F]
Factory setting:
45 °C; 120 [°F]
Note:
The thermostat switch-on temperature can
only be smaller than or equal to the thermo-
stat switch-off temperature.
The thermostat function works independently from
the solar operation and can be used for afterheating.
Reference sensor for this function is S3.
If the temperature falls below the thermostat switch-
on temperature AH O, relay R2 is energised for af-
terheating. If the thermostat switch-off temperature
AH F is exceeded, the relay switches off.