Roth BW/H Komfort HE, Manual For The Specialised Craftsman

Page: 73 / 80

73
en
Is the pump current enabled by the
controller?
Display illuminated? If not, press
button
➄
. Display illuminated again?
Does the pump start up in manual
operation?
The solar circuit pump does not work, although the collector is considerably
warmer than the store.
yes no
yes
There is no current; check fuses /
replace them and check power supply.
The adjusted temperature differ-
ence for starting the pump is too
high; choose a value which makes
more sense.
no
yes no
Stores cool down at night.
Collector circuit pump runs during
the night?
no
Check controller
Check the non-return valves in
the flow and the return pipe for
functional efficiency.
Sufficient store insulation?
yes no
Increase insulation.
Insulation close enough to the store?
yes no
Replace insulation or increase it.
Are the store connections insulated?
yes
Insulate the connections.
Warm water outflow upwards?
no yes
Change connection and let the water
flow sidewards or through a siphon
(downwards); less store losses now?
no yes
o.k.
a
Collector temperature at night is high-
er than the outdoor temperature.
no yes
Controller might be defective -
replace it.
Is the pump stuck?
Turn the pump shaft using a screw-
driver; now passable?
Pump is defective - replace it.
yes
no
yes
no
Does the DHW circulation run for
a very long time?
no yes
Use the circulation pump with
timer and switch-off thermostat
(energy-efficient circulation).
Circulation pump and blocking
valve should be switched off for 1
night; less store losses?
yes no
Check whether the pumps of the
after-heating circuit run at night;
check whether the non-return valve
is defective; problem solved?
no
yes no
a
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 activated, otherwise it is closed;
connect pump and 2-port valve
electrically in parallel; activate the
circulation again. Deactivate pump
speed control!
Clean or replace it.
Further pumps which are connect-
ed to the solar store must also be
checked.
Check the non-return valve in
warm water circulation - o.k.