© Caleffi 11236_iSolar_Plus.mon
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The
D e lt a S o l
®
BS Plus priority logic
PRIO:
Loading priority
Adjustment range:
SE 1, SE 2, Su 1, Su 2, 0, 1, 2
Factory setting:
Arr 4: 2
Arr 5, 6: 1
If a multi-tank system layout has been chosen, the priority
logic determines how the heat is divided between the
tanks. Different types of priority logic are adjustable:
• spreaded loading (SE 1 and SE 2)
• successive loading (Su 1 and Su 2)
• parallel loading (0)
• tank sequence control (1 and 2)
If priority SE 1 or SE 2 (only available in Arr 6) is
adjusted, the subordinate tank will be loaded in parallel if
the temperature difference between the collector and the
priority tank (tank 1 for SE 1, tank 2 for SE 2) exceeds the
adjusted value DTSE and the subordinate tank has not
reached its maximum temperature.
Parallel loading will stop as soon as the temperature
difference between the collector and the priority tank falls
4 °Ra [2 K] below DTSE or the subordinate tank reaches
its maximum temperature.
If priority Su 1 or Su 2 is adjusted, the tanks are loaded
successively. The subordinate tank will only be loaded if the
priority tank (tank 1 for Su 1, tank 2 for Su 2) has reached
its adjusted maximum temperature (S1MX or S2MX).
If priority 0 is adjusted and the switch-on conditions are
fulfilled for both tanks, the tanks are loaded in parallel
(Arr 6), resp. in an oscillating loading (Arr 4, 5) beginning
with the tank with the lowest temperature. In an oscillating
loading, solar loading will switch from one tank to the other
in steps of 10 °Ra [5 K] temperature difference between
the tanks.
If priority 1 / 2 is adjusted, tank sequence control will
be activated (see below) with the corresponding tank as
priority tank.
Note:
Priority logic can be used in multi-tank system
layouts only (Arr = 4, 5, 6).
Note:
If the priority is set to Su 1 or Su 2, solar
loading of the subordinate tank will be aborted
at once if the temperature in the priority tank
(tank 1 for Su 1, tank 2 for Su 2) falls below the
adjusted maximum temperature. If, in that case,
the temperature difference between the priority
tank and the collector is not sufficiently high,
solar loading will be stopped completely.
DTSE:
Spread temperature difference
Adjustment range:
40 ... 160 °Ra
[20 ... 90 K]
in steps of 1 °Ra [1 K]
Factory setting: 70 °Ra [40 K]
Spreaded loading temperature difference
(only available if PRIO is set to SE 1 or SE 2)
Tank sequence control will be activated when PRIO is set
to SE 1, SE 2, 1 or 2.
If the priority tank cannot be loaded, the subordinate tank
is checked. If useful heat can be added, it will be loaded
for the “loading runtime time” (tRUN - factory setting
15 min.) After this, the loading process stops and the
controller monitors the increase in collector tempera-
ture during the loading break time tLB. If it increases by
4° Ra [2 K], the break time timer starts again to allow the
collector to gain more heat. If the collector temperature
does not increase sufficiently, the subordinate tank will be
loaded again for the tRUN time as before.
As soon as the switch-on condition of the priority tank is
fulfilled, it will be loaded. If the switch-on condition of the
priority tank is not fulfilled, loading of the second tank will be
continued. If the priority tank reaches its maximum tempera-
ture, sequence controlled loading will not be carried out.
If tank sequence control is active and the system switches
to load the priority tank, the parameter tLB also acts as a
stabilization timer, during which the switch-off condition DT F
is ignored while the system operation stabilizes.
Tank sequence control
(only available if priority is set to SE 1, SE 2, 1 or 2)
tLB:
Loading break time
Adjustment range: 1 ... 30 min
Factory setting: 2 min
tRUN:
Loading runtime
Adjustment range: 1 ... 30 min
Factory setting: 15 min
