Heat source - primary
WARNING
The primary hydraulic system of the heat source can only be filled with a medium
recommended by the manufacturer.
Surface collector / depth probe
To prepare an efficient antifreeze liquid, water needs to be added at least 30 % of ethylene glycol. Such
a mixture provides protection against freezing up to -15 °C. Prepare the mixture according to the
recommendations in the table below.
NOTE
Before use, mix the mixture in a large container so as to ensure a homogeneous mixture.
Use a minimal concentration of 30 %, up to the temperature of -15 °C.
The entire volume of the pipes and the quantity of the antifreeze agent at each 100 m section at various
pipe diameters.
Pipe according to SIST
EN 12201
(PN 12,5)
in mm
The entire volume of
the pipe
for each 100 m section
of the pipe
in litres.
Quantity of antifreeze agent
for each 100 m section of the pipe
in litres (30 % concentration up to -15 °C).
WATER / antifreeze agent
32 x 3,0 (DN25)
53.1
37.1 / 16.0
40 x 3,7 (DN32)
83.5
58.4 / 25.1
50 x 4,6 (DN40)
130.7
91.4 / 39.3
63 x 5,8 (DN50)
207.5
145.2 / 62.3
75 x 6,9 (DN60)
294.2
205.9 / 88.3
90 x 8,2 (DN80)
425.5
297.8 / 127.7
NOTE
When determining the sufficient amount of the antifreeze mixture it is necessary to consider
the length of the pipe (supply and return) from the ground collector shaft to the utility room.
Filling procedure:
1. Check the main hydraulic system for tightness.
2. Connect the filling pipe to the collector / depth probe.
3. Open the vents (valves) on the device and the primary hydraulic system.
4. Start filling the antifreeze mixture. Make sure the system will be vented during filling.
5. Perform the filling until the vents (valves) lets out water without air mixed in.
6. Close the vents (valves) and fill the system as described in the chapter 3.2.3.
Underground water - primary
In case of using ground water as primary heat source, use the intermediate heat exchanger to protect
the device from the influences of undesirable substances and impurities in the ground water. Fill the
system between the exchanger and the device with an appropriate mixture of water and antifreeze
agent. The mixture should have a freezing point of at least -5 °C.
To fill the system with an intermediate heat exchanger, use the same procedure as when filling the
ground collector or depth probe.
CAUTION
In case that the quality of ground water does not meet the requirements of Chapter 3.2.2,
corrosion may occur over time. In extreme case the failure of the heat exchanger can
occur.
