Dimplex SOLAR ST0133 - Manual (Page 56)

Technical manual
Page 56 of 72
ST0133 – A 02/09
SOLAR
Check content discharge vessel
Should any heat transfer medium be deposited in the discharge vessel which was not
there from the beginning, the cause is to be established.
Check roof feed-through for leaks
The points at which the pipe work penetrates the primary and secondary protection
layer are to be inspected if accessible. No leakage must be found at these points.
Check condition of pipe insulation
As detailed in Chapter 6.6 the pipe work insulation in solar thermal systems must fulfil
certain criteria. However, damage due to system overheating, animal and mechanical
influences are always possible. Damaged insulation is to be replaced.
Check collector fixations
This work must be carried out with safe access only.
Check electrical connections
This check must only be carried out in a safe manner and by a qualified person.
Check pump function
This check can be carried out by moving the switch on the side of the control unit to its
ON position. A flow should be registered on the flow meter in the system. Remember to
return the control unit into AUTO when testing is complete.
Check sensor readings
The sensor readings can be checked in the display of the control unit by pressing the up
and down buttons. Should any doubt exist about the correct reading, the sensor should
be exchanged against another sensor in the system for reference and replaced if re-
quired.
Check frost protection and pH value of heat transfer medium
The SOLHTTK test kit is to be used to ensure the heat transfer medium retained its
properties. To access the heat transfer medium in the system slacken the bleed screw
of the circulating pump and allow 1 or 2 drops of liquid to escape to carry out the test-
ing.
Check charge pressure expansion vessel
This can only be carried out when the expansion vessel is hydraulically disconnected
from the solar loop. It must therefore not be undertaken when the system is hot or will
heat up in the foreseeable future. This check must only be carried out when any doubt
exists that the charge pressure has reduced such as reduced fill pressure, pressure fluc-
tuation between cold and hot system.
At the end of the maintenance routine it is imperative to ensure the system is back in
its automatic operation and that the user is informed of what has been undertaken.