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Checks
10 CHECKS
On completion of the installation, perform the checks listed in the table below.
Collector circuit
Cold circuit pressure:____bar (see table above)
Collector circuit seal test
Safety valve check
Anti-freeze checked to - ___ °C
pH of heat transfer fluid = ____
Collector circuit bled
Flow rate of 30 l/h per m
Non-return valve functioning
11 MAINTENANCE
Maintenance
Service the system and perform the checks listed in the tables below at least once every two years.
Collector circuit
Cold circuit pressure:____bar (see table above)
Collector circuit seal test
Safety valve check
Anti-freeze checked to - ___ °C
pH of heat transfer fluid = ____
Collector circuit bled
Flow rate of 30 l/h per m
Non-return valve functioning
Checking the heat transfer liquid
Check the anti-freeze effect and the pH level of the heat transfer liquid every 2 years.
− Use an instrument like a refractometer or densimeter to check the anti-freeze effect (which must have a nominal protection
value of approx. -30°C). If the protection threshold is higher than -26°C, replace the mix, or add anti-freeze as required.
− Use litmus paper to check the pH (nominal value approx. 7.5). If the measured value is below 7, change the heat transfer
liquid.
H
checked
2
checked
2
H
up to 15 m
15 - 20 m
20 - 25 m
25 - 30 m
General rule: p [bar] = 1.5 + H [m] / 10
Visual check of collectors
Collectors cleaned if necessary
Visual check of collector fixing points
Visual check of roof impermeability
Visual check of insulation/lagging
Visual check of collectors
Collectors cleaned if necessary
Visual check of collector fixing points
Visual check of roof impermeability
Visual check of insulation/lagging
10
Pressure at boiler
3 bar
3,5 bar
4 bar
4,5 bar
Solar collectors
Solar collectors
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