Maintenance Tasks - De Dietrich D 230 Folleto De Información Sobre El Sistema

Check the seals and hydraulic connections of the solar collectors to the system.
Check the solar collector support system.
Check for leaks in the hydraulic circuit.
Check that the heat-transfer fluid used in the system is composed of a mixture of antifreeze and water.
Check the installation of safety elements: expansion tank and safety valve.
Check the connections and operation of the regulation system of the installation.
During filling and commissioning, the system must be completely drai-
ned. We recommend re-testing the system during the first weeks of ope-
ration to release any air
In case of breakdown or drops in the system, you will need to
vent the air again when refilling. NEVER fill the primary circuit
with tap water if its properties could lead to the formation of
incrustations, deposits or attack on the circuit, or if the circuit
needs antifreeze due to the risk of frost or any other additive
to function properly.
Note: Only operate the air vent when the system is cold. During
normal operation, the heat-transfer fluid reaches high temperatures
and can cause severe burns.
Check the pH valve at regular intervals to make sure that it is bet-
ween 7.5 and 8.5. If the fluid is dark or cloudy and the pH value is
below 7.0, the heat-transfer fluid must be replaced.
The percentage of glycol in the heat-transfer fluid should be checked every
two years. This can be done using a refractometer.
Note that the cold pressure in the collectors should be above 2 bar. Since
the filling pressure gauge is located in the bottom part of the installation, we
must add the static pressure of the system when taking the reading. The
maximum permissible temperature for the system is 10 bar.
After commissioning, do not forget to close all manual and
automatic vents.
Once the system has been flushed, drained and has the correct
pressure, we must regulate the flow of the system. To do so, we
will need to adjust the pump flow to the lowest possible speed (to
minimise electrical consumption) and regulate the flow using a flow
meter.

MAINTENANCE TASKS

The following lists include the most important maintenance
operations for an installation.
1. Check the proper functioning of the system
Perform this checklist during commissioning.
2. Check on general system status
The following checks cover the operations needed to maintain the system
within the acceptable limits of operation, performance, protection and du-
rability. These operations must be carried out by competent technical staff
with expertise in solar thermal technology and mechanical installations in
general. The maintenance register of the system must be kept up to date.
The maintenance of systems with a collector area of over 20 m² must un-
dergo inspection at least every six months. Those of less than 20 m² should
be inspected on an annual basis.
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