Holiday Function - Resol DeltaSol MX Manual

Flow and return interchanged
This function is used for detecting an interchange of the fl ow and return pipe or a
badly placed collector sensor. For this purpose, the collector temperature is mon-
itored for plausibility during the switch-on phases of the solar pump. The message
FL / RE interchanged will appear, when the plausibility criteria have not been met
5 times in a row.
Note
The function control Flow and return interchanged according to the
VDI guidelines 2169 can only correctly detect and indicate the error 0031
!FL/RE interchanged! if the collector sensor measures the temperature
directly in the fl uid at the collector outlet. If the collector sensor is not
correctly placed, a false message may occur.
Î Place the collector sensor directly in the fl uid at the collector outlet
or deactivate the Flow and return interchanged function control.
Maximum store temperature
This function is used for detecting and indicating if the adjusted maximum store tem-
perature has been exceeded. The controller compares the current store temperature
to the adjusted maximum store temperature, thus monitoring the store loading circuits.
The maximum store temperature is considered exceeded when the temperature
measured at the store sensor exceeds the adjusted maximum store temperature by
at least 5 K. The monitoring becomes active again as soon as the store temperature
falls below the adjusted maximum store temperature.
In the Store channel, the store or stores to be monitored can be selected.
A possible cause for an unwanted exceedance of the maximum store temperature
is a defective valve.
8.4

Holiday function

Solar / Holiday function
Adjustment
Description
channel
Cooling Cooling logic variant
Collector maximum tem-
TColmax.
perature
Store (1 ... 5) Store succession order
St. cooling Store cooling option
Switch-on temperature
DTon
difference
Switch-off temperature
DToff
difference
Stmax (1 ... 5) Store cooling temperature 4 ... 95 °C
Heat dump Store heat dump
Output Output selection
Sensor Sensor selection
TStoreOn Switch-on temperature
TStoreOff Switch-off temperature
The holiday function is used for operating the system when no water consumption
is expected, e. g. during a holiday absence. This function cools down the system in
order to reduce the thermal load.
Only if the holiday function has been activated with the parameter Days of absence
will the adjustments described in the following become active.
4 cooling functions are available: system cooling, collector cooling, store cooling and
store heat dump.
Type system cooling
If the system cooling variant has been selected and the switch-on temperature dif-
ference is exceeded, store loading will continue even if the corresponding maximum
temperature is exceeded, but only up to the emergency shutdown temperature.
Store loading continues until all stores have reached the emergency shutdown tem-
perature or until the switch-off temperature difference is reached.
Type collector cooling
If the collector cooling variant has been selected, store loading will continue when
the collector maximum temperature is exceeded.
Store loading continues until all stores have reached the emergency shutdown tem-
perature or until the collector temperature falls below the collector maximum
temperature by at least 5 K.
Adjustment range /
Factory setting
selection
Col. cool., Syst. cool., Off Off
70 ... 190 °C 100 °C
system dependent system dependent
Yes, No Yes
1.0 ... 30.0 K 20.0 K
0.5 ... 29.5 K 15.0 K
40 °C
Yes, No No
system dependent -
system dependent -
5 ... 95 °C 65 °C
4 ... 94 °C 45 °C
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