Velux TFF 200, Инструкция по применению, Страница: 54 / 56

54 VELUX
SECTION III: SOLAR CONTROL SYSTEM SECTION III: SOLAR CONTROL SYSTEM
no yes
no yes
no yes
no yes
Does the pump start up
in manual operation?
Are the fuses of the
controller o.k.?
Replace the fuses. Controller seems to be
defective − replace it.
Is the pump defective
− replace it.
Is the current of the
pump released by
the controller?
The adjusted tempera-
ture difference for
starting the pump is
too high; choose a value
which makes more sense.
Start the pump shaft
up by a screwdriver;
is it ready for operation
now?
yes no
yes
Is the pump stuck?
no
yes
no
no yes
yes no
no
no yes
o.k.
yes no
Does collector circuit
pump run during the night?
Check the controller
functions
Check the return flow pre-
venter in feed flow and
return flow with regard to
the functional efficiency.
Change connection and
let the water flow
sidewards or through a
siphon (bow down-
wards); less store losses
now?
Use the circulation pump
with timer and
switch-off thermostat
(energy efficient
circulation)
Make sure that the pumps
of the after-heating
circuit are not in nightly
use and that the return
flow inhibitor is fault-
less; problem solved?
Please also check
further pumps which
are connected to the
solar store.
Clean or replace.
Collector temperature is
at night higher than
ambient temperature.
Warm water outflow
upwards?
Does warm water
circulation run for a
very long time?
Switch-off the
circulation pump and
the blocking valves
for 1 night; less store
losses?
Control the return flow
preventer in warm
water circulation - o.k.
The gravitation circulation in the circulation line is too
strong; insert a stronger return flow preventer or an
electrical 2-way valve behind the circulation pump;
the 2-way valve is open in pump operation, otherwise
it is closed, connect pump and 2-way valve in parallel;
activate the circulation again!
Stores are cooled during the night. The solar circuit pump does not work although the
collector is obviously warmer than the store.