AM, EM, AQ, BA, ASW - IOM
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4.12 Anti-Freeze Mixture
Mixtures based on Ethyleneglycol, Propyleneglycol or Ethanol can be used as anti-freeze
mixture. Special mixture for heat pumps must be used. The mixture must be mixed for freezing
point of at least -15°C. The correct concentration is to be found in the concentrate manufacturer
documentation. Regular tap water should not be used for the anti-freeze mixture. Distilled water
is the ideal solution. If in doubt, follow the concentrate supplier instructions.
4.13 Filling and Venting the Ground Loop
Equipment as per scheme from Chapter 4.8 is required for Filling and Venting. Use barrel for
mixing anti-freeze mixture, garden rust-free pump, and garden hose with ends for connecting
the pump.
Natural venting is not possible due to the design of the piping system. The venting must be thus
made by “pressuring” - rapid circulation of the anti-freeze mixture inside the loop which will
press the air out of the piping collector.
Filling and venting procedure:
•
Prepare sufficient volume of the concentrate which is calculated from the total length of
the piping
•
Pour the concentrate into the barrel
•
Close valves connecting the heat pump with the distributor and collector
•
Leave only 1st loop open, close the others on the distributor and collector
•
Measure volume of concentrate to fit in 1 loop (a little less)
•
Turn the pump on and start filling the loop with the concentrate, leave to run the pressed
out water outside the barrel, turn the pump off after filling the measured volume
•
Close the loop and open the next one in line, repeat the process above
•
After filling the required volume of concentrate for the entire collector (app. 1/3 of loops)
refill the barrel with water (only as much as we need, refilling as needed)
•
Close all loops and return to the 1st loop, open it
•
Put the “waste” hose into the barrel and turn the pump on, leaving the mixture to circulate
and refill water to the barrel as needed till all air is removed from the loop
•
Repeat this procedure for each loop individually
•
After venting all loops, open all loops and leave the mixture to circulate through all the
loops to mix the anti-freeze mixture properly
•
The barrel has to be refilled when mixing the mixture based on Ethanol, because the total
volume decreases due to mixing water and ethanol
•
Next we vent the distributors connection with the heat pump by closing all loops and
open only the connections, using same method as with the loops
•
Pay attention to the correct flow direction, we must fill the heat pump with the mixture
through the filter !!!
•
Now correct circulation can be tested by the inbuilt circulation pump
•
Measure and verify the freezing point of the anti-freeze mixture to at least -15°C, using
the refractometer
•
If all is correct, disconnect the filling set and leave the rest of the mixture for contingent
future refills
ATTENTION:
It is impossible to perform proper venting using the inbuilt circulation pump !!!
Proper venting and mixing the mixture is essential for correct and flawless operation of
the ground source heat pump.
