en
67
Installation
Indications,
functions and options
Messages
Commissioning
Operation and function
o.k.
Pump is overheated, but no heat transfer from the collector to the store, flow
and return have the same temperature; perhaps also bubbling in the lines.
Air or gas bubbles in the system?
no
yes
Is the collector circuit blocked at the
dirt trap?
yes
Clean dirt trap
Pump starts for a short moment, switches off, switches on again, etc.
Temperature difference at the con-
troller too small?
no
yes
Wrong position of collector sensors?
yes
Change
∆
Ton and
∆
Toff correspond-
ingly.
Mount the collector sensor at solar
flow (warmest collector output); use
immersion sleeve of the respective
collector.
no
no
o.k.
Pump starts up very late.
The temperature difference between store and collector increases enormous-
ly during operation; the collector circuit cannot dissipate the heat.
Collector circuit pump defective?
no
yes
Heat exchanger calcified?
yes
Check / replace it
Decalcify it
no
Heat exchanger blocked?
yes
no
Clean it
Heat exchanger too small?
yes
Change
∆
Ton and
∆
Toff correspond-
ingly.
Switch-on temperature difference
∆
Ton too large?
no
yes
Vent the system; increase the system
pressure to a static primary pressure
of at least plus 0.5 bar; if necessary
continue to increase pressure; switch
the pump on and off for a short time.
Plausibility control of the option
tube collector special function
Replace with correctly sized one.
Non-ideal position of the collector
sensor (e. g. flatscrew sensor instead
of sensor in immersion sleeves).
yes
Activate tube collector function if
necessary.
o.k.
