53 VELUX
SECTION III: SOLAR CONTROL SYSTEM
SECTION III: SOLAR CONTROL SYSTEM
no
yes
yes
Pump starts up very late and stops working soon.
no
yes
yes
Control / replace
Decalcification
no
yes
no
Clean
yes
no
no
yes
o.k.
no
Air in the system ?
no
yes
yes
yes
o.k.
Pump is overheated, but no heat transfer from
collector to the store, feed flow and return flow are
equally warm, perhaps also bubble in the lines.
Bleed the system; the
primary pressure of the
expansion tank has to
exceed the static pressure
by approx. 0,5 bar, the
system pressure has to
exceed it by approx. 0,5
up to 1 bar (depending on
the dimensioning of the
expansion tank); switch
the pump on and off for
a short time.
Is the collector circuit
plugged at the dirt trap?
Switch-on-temperature
difference ∆Ton
too large?
Collector sensor unfavour-
able placed e.g. contact
sensor instead of
immersion sleeve sensor?
If necessary activate
tube collector function.
Mount the collector
sensor at solar feed flow
(warmest collector
output); use the
immersion sleeve of the
respective collector.
Plausibility control of
the option tube
collector special
function?
Clean the dirt trap
Is the temperature diffe-
rence at the controller
too small?
Wrong placing of the
collector sensor?
Collector circuit pump
defect ?
Heat exchanger
calcified?
Heat exchanger
plugged?
Heat exchanger
too small?
New calculation of the
dimension.
Change ∆Ton and ∆Toff
accordingly.
Change ∆Ton and
∆Toff accordingly.
Pump starts for a short moment, switches-off,
switches-on again, etc.
The temperature difference between store and
collector increases enormously during operation; the
collector circuit cannot dissipate the heat.
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