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IT
ANOMALY
Drop in system pressure
The solar accumulator
The collectors are warm
during the night
Implausible temperature
values or no controller
reading
Deteriorated heat transfer
fl uid
(see previous page)
GB
CAUSE
System not airtight
Air in the system
Entry pressure in expansion vessel too high
Defective pump
Defective or incorrectly set heat sensor
Defective solar controller
Air in the system
Defective or incorrectly adjusted nonreturn valve
Defective solar controller
Defective or incorrectly set heat sensor
If present: defective solar sensor
On very warm nights: "moon eff ect"
Defective or incorrectly set heat sensor
Defective solar controller
a short period of operation:
− Incorrect sizing of the components
− Heat extractor too small
− Incorrect piping outline
− Incorrect assembly of collectors (rotated by 90°)
− Defective solar controller
− Residue in the piping
Normal wear and tear after years' usage
Normal wear and tear after years' usage
FR
SOLUTION BY AUTHORIZED TECHNICIAN
Locate the leakage points and seal them. Fill with
propylene glycol and deaerate.
Rinse and deaerate the system, adjust the pressure
Correct the entry pressure in the expansion vessel.
Flush out the system, measure the entry pressure
and adjust it to the static pressure. Fill and deaerate
the system again.
Replace
Replace or set correctly
Replace
Deaerate the system, check the pressure
Replace
Replace
Replace or set correctly
Replace
No function anomaly without solar sensor; on cold
nights the eff ect is absent
Replace or set correctly
Replace
Remove or correct the system error
Completely fl ush out the heat transfer fl uid and dispose of it in
compliance with current legislation.
Thoroughly rinse the system with water. Refi ll the system with
the propylene-glycol and water mix according to use and
deaerate
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