DE DIETRICH NEO 2.1 - Manual (Page 65)

6 Checking and maintenance
6.1 General instructions
CAUTION
4
Maintenance operations must be done by a qualified
engineer.
4
An annual inspection is compulsory.
4
Only original spare parts must be used.
4
Protection of the environment: Place a container of
sufficient volume under the drain pipe and the valve
discharge pipe.
4
Check the solar collectors and their fastenings.
4
Check that there are no leaks on the hydraulic connections.
4
The hydraulic pressure must be a minimum of 2 bars
4
Check that the sensors are operating correctly.
4
Check the safety devices (particularly the valve or safety unit),
referring to the instructions provided with these components.
4
Check the antifreeze power of the heat transporting fluid
(Minimum -20 °C).
4
Check the pH of the heat transporting fluid; it should be between
7 and 8.
4
Clean the surface of the solar collectors using a soft, damp cloth.
4
Check that the gaskets and connections are in good condition.
4
Check that the insulation is in good condition (no mechanical
deterioration or damage caused by the pecking of birds or UV).
NEO 2.1 / SUN 211 6. Checking and maintenance
30/11/2011 - 300021356-001-F 64