Caleffi solar iSolar 2 Handbuch - Seite 19
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Seite druckenTanks cool down at night.
Does the collector
circuit pump run in the
night?
no
yes
At night, the collector
temperature is higher
than the outdoor tem-
perature.
no
yes
Sufficient tank insulation?
yes
no
Insulation close enough
to the tank?
yes
no
Are the tank connections
insulated?
yes
no
Warm water flow up-
wards?
no
yes
Does warm water circu-
lation run for a very long
time?
no
yes
Circulation pump and
blocking valve should be
switched-off for 1 night;
less tank losses?
yes
no
a
Check controller.
Check the non-return
valve in flow and return
pipe with regard to the
functional efficiency.
Increase insulation.
Replace insulation or in-
crease it.
Insulate the connections.
Change connection and
let the water flow side-
wards or through a siphon
(bow downwards); less
tank losses now?
no
yes
o.k.
Use the circulation pump
with timer and switch-off
thermostat (energy effi-
cient circulation)
Check whether the pumps
of the after-heating cir-
cuit runs at night, check
non-return valve; problem
solved?
no
b
a
Check the non-return
valve in warm water cir-
culation- o.k.
yes
no
The gravity circu lation in
the circulation line is too
strong; insert a stronger
valve in non-return valve
or an electric 2-port val-
ve behind the circulation
pump; in pump operation,
the 2-port valve is open,
other wise it is closed, co-
nect pump and 2-port
valve in parallel; activate
circulation again!
The solar circuit pump does not run although the collector
is significantly warmer than the tank.
Does the control LED
flash?
yes
no
Does the pump start up
in manual operation?
no
yes
Is the pump current re-
leased by the controller?
no
yes
Are the controller fuses
o.k.?
no
yes
Replace the fuses.
b
Further pumps which are
connected to the solar
tank must also be che-
cked.
Clean or replace
No current; check fuses
/ replace them and check
power supply.
The adjusted temperature
difference for starting the
pump is to high; choose a
value which makes more
sense.
Is the pump stuck?
yes
Turn the pump shaft using
a screwdriver; now pas-
sable?
no
Pump is defective - re-
place it
Controller might be de-
fective - replace it.
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