Viessmann SCU345, Руководство пользователя

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Collector circuit pump runs during the night?
Collector temperature at night is higher than the
outdoor temperature.
Sufficient tank insulation?
Insulation close enough to the tank?
Warm water outflow upwards?
Are the tank connections insulated?
Does the warm water circulation run for a very
long time?
Circulation pump and blocking valve should
be switched off for 1 night; less tank losses?
Check controller
Check the non-return valves
in the flow and the return pipe
for functional efficiency.
Increase insulation.
Replace insulation or
increase it.
Insulate the connections.
Use the circulation pump
with timer and switch-off
thermostat (energy efficient
circulation).
Check whether the pumps
of the after-heating circuit
run at night; check whether
the non-return valve is
defective; problem solved?
no
no
yes
yes
no
yes
no
yes
yes
yes
no
no
yes
no
yes
no
no
Tanks cool down at night.
a
a
a
b
Check the non-return valve in warm water cir-
culation - o.k.
Clean or replace it.
Further pumps which are
connected to the solar tank
must also be checked.
The gravitation circulation
in the circulation line is too
strong; insert a stronger
valve in the non-return valve
or an electrical 2-port valve
behind the circulation pump;
the 2-port valve is open
when the pump is acti-
vated, otherwise it is closed;
connect pump and 2-port
valve electrically in parallel;
activate the circulation again.
Deactivate pump speed
control!
yes
no
a b
Change connection and let
the water flow sidewards or
through a siphon (down-
wards); less tank losses now?
o.k.
no yes