© Caleffi 08301_iSolar Plus 24V.monus.indd
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4.1.8∆T-regulation
DT O / DT1O / DT2O /
DT3O:
Switch on temperature diff.
Adjustment range 2,0 ... 40,0°Ra
Factory setting 12,0°Ra
DT F / DT1F / DT2F / DT3F:
Switch-off temperature diff.
Adjustment range 1,0 ... 38,0°Ra
Factory setting 8,0°Ra
4.1.9Tankmaximumtemperature
If the adjusted maximum temperature is exceeded, a further
loading of the tank is stopped so that a damaging overheating
can be avoided. If the maximum tank temperature is exceeded,
symbol
is shown on the display.
Please note: The controller is equipped with a security-
switch-off of the tank, which avoids a further loading of the
tank if 295°F is reached at the tank.
S MX / S1MX / S2MX:
Maximum tank temp.
Adjustment range -40 ... +480°F
Factory setting -140°F
First the controller works in the same way as a standard
differential controller. If the switch-on difference (DT O /
DT1O / DT2O) is reached, the pump is activated. If the
adjusted switch-off temperature is underrun (DTF / DT1F
/ DT2F), the controller switches-off.
Maximum temperature limitation
The controller is equipped with an independent tempe-
rature differential regulation for which minimum and
maximum temperature limations as well as corresponding
switch-on and -off temperatures can be separately adjusted.
Only possible for Arr = 2 and 8 (e.g. for solid fuel boilers or
heat exchange regulation).
If the adjusted value MX3O is exceeded, relay 2 will
be deactivated. When falling below MX3F, the re-
lay will be switched on again.
Reference sensor:
S3 by Arr 8 (TSTU)
S4 by Arr 2 (TST2)
Is the adjusted value MN3O underrun, relay 2 will be
deactivated. By falling below MN3F, the relay will be
switched on again.
Reference sensor:
S4 by Arr 8 (TFSB)
S3 by Arr 2 (TSTU)
Both switch on- and switch off temperature differences
DT3F and DT3O apply parallely for the maximal- and
minimal temperature limit.
MX3O / MX3F:
Maximum temperature limi-
tation
Adjustment range 30 ... 205°F
Factory setting
MX3O 140°F
MX3F 136°F
Minimum temperature limitation
MN3O / MN3F:
Minimum temperature limi-
tation
Adjustment range 30 ... 195°F
Factory setting:
Arr = 2
MN3O 40°F
MN3F 50F
Arr = 8
MN3O 140°F
MN3F 150°F
4.1.10 ∆T-controller(solid fuel boiler and heat exchange)
Please note: Switch-on temperature difference DT O must
be at least 2 °Ra higher than the switch-off tempe rature-
difference DF.
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