DeltaSol
®
AX
© RESOL 06255 deltasol_ax.monen.ind
d
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10
Pump starts for a short moment, switches-off, switches-on
again, etc. („controller hunting“)
Is the temperature dif-
ference at the controller
too small?
no
yes
Wrong position of the
collector sensor?
yes
Change
∆
T
on
and
∆
Toff
accordingly.
Mount the collector sen-
sor at solar flow
warmest collector out-
put);
Pump starts up very late and soon stops working soon.
The temperature difference between store and collector
increases enormously during operation; the collector cir-
cuit cannot dissipate the heat.
Collector circuit pump
defect ?
no
yes
Heat exchanger calci-
fied??
yes
Conrtol / replacement
Decalificatiom
no
Heat exchanger blocked?
yes
no
Cleaning
Heat exchanger too
small?
yes
New calculation of the
dimension.
Change
∆
T
on
and
∆
Toff
accordingly.
Switch-on-temperature
difference
∆
T
on
too large
no
yes
Collector sensor un favour-
able placed (e.g. contact
sensor instead of immersion
sleeve sensor?
o.k.
no
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.
Vent system; increase sys-
tem pressure to at least
static primary pressure
plus 0,5 bar; if necessa-
ry continue to increase,
switch the pump for a
short time off and on.
Air in the system?
no
yes
Is the collector circuit
blocked at the dirt trap?
yes
Clean the dirt trap
If necessary activate tube
collector function.
yes
o.k.
5. Annex: Fault finding