Cosmo Multi 2 User Manual

Pump starts for a short moment, switches-off, swit-
ches-on again, etc.
Temperature difference
at the controller too
small?
no yes
Wrong position of colle-
ctor sensors?
yes
Change DTon and
DToff correspondingly.
Mount the collector
sensor at solar flow
(warmest collector
output); use immersion
sleeve of the respective
collector.
Pump starts up very late The temperature diffrence between store and coll-
ector increases enormously during operation; the
collector circuit cannot dissipate the heat.
Collector circuit pump
defective?
no yes
Heat exchanger calci-
fied?
yes
check / replace it
Decalcify it
no
Heat exchanger
blocked?
yesno
Clean it
Heat exchanger too
small?
yes
Repalce with correctly
sized one.
no
Plausibility control of
the option tube colle-
ctor special function
Change DTon and DToff
correspondingly.
Switch-on temperature
difference DTon to
large?
no yes
Non-ideal position of
the collector sensor (e.g.
flatscrew sensor instead
of sensor in immersion
sleeves)?
o.k.no
Pump is overheated, but no heat transfer from the
collector to the store, flow and return have the same
temperature; perhaps also bubble in the lines.
Air the system; in crease
the system pressure to
at least static primary
pressure plus 0,5 bar;
if necessary continue
to increase pressu-
re; switch the pump
off and on for a short
time.
Air in the system?
no yes
Is the collector circuit
blocked at the dirt trap?
yes
Clean the dirt trap
Activate tube collector
function if necessary.
yes
o.k.
5. Troubleshooting
116

Cosmo Multi 2 Specifications

General

Brand	Cosmo
Model	Multi 2
Category	Controller
Language	English