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2.4. Filling and de-aeration of the ground loop
Equipment required for the filling and deaeration of the ground loop:
• mixing tank, 60 litres
• a submersible pump fitted with a filter, lifting height approximately 30 m
• water and ethyl alcohol, or glycol-water mixture (1:1) with a frost resistance of -17 degrees Celsius
• 2 x textile hose 1”, length approx. 3 m
• 2 x joint 1/2” (female)
THE FILLING AND DE-AERATION PROCESS
Please check that the ground loop has been correctly connected (see “Connecting the ground loop” section) and that
the compressor in Lämpöässä V models has been preheated (see ”Safety precautions” section).
1. remove the styrofoam packaging protecting the group of fill valves
2. detach the expansion tank from the foremost ball valve
3. close the shut-off valve at the back of the group of fill valves
4. open the foremost shut-off valve in the group of fill valves
5. attach the submercible pump textile hose to the foremost ball valve in the group of fill valves and open the ball valve
6. attach a textile hose from the ball valve at the back of the group of fill valves to the filling container and open the valve
7. fill the container with a geothermal fluid mixture (ethyl alcohol water or glycol with a frost resistance
of -17 degrees Celsius)
8. turn on the submersible pump
9. add the water and ethyl alcohol mixture to the mixing container until no more fluid can enter the pipes
10. keep the submersible pump running until the fluid is clear and no gurgling can be heard from the pipes.
Please note! Deaeration usually takes several hours and helps ensure that all the air is removed from the system and
that there are no malfunctions once the system is started. LEAVE NO PRESSURE IN THE NETWORK!
11. open the shut-off valve at the back of the group of fill valves
12. close both ball valves
13. remove the filling hoses
14. fasten the expansion tank back in its place in the foremost ball valve in the group of fill valves
15. remove the shut-off valve on the expansion tank
16. fill 3/4 of the expansion tank with the geothermal fluid mixture
17. fasten the shut-off valve to the expansion tank
18. open the foremost shut-off valvae in the group of fill valves
19. remove and clean the net strainer on the mud separator
Filling and deaeration have now been completed.
PLEASE NOTE! Once the heat collecting pipes have been placed in a bore well, we would advise users to switch the
positions of the textile hoses in the group of fill valves during filling and deaeration. This increases the efficiency of the pipes.
