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Pressure in ground source loop (ground pipe)
The pressure must be inspected as often as several times a day in the initial days. If necessary,
the system must be topped up with brine. See Figure 13, point 17
Brine pressure will stabilise after a few days and inspection can then be reduced to once a month.
It is important that brine pressure is correct. Too little pressure in the ground source loop can/will
trigger the alarm device in the ground source heat system. (low pressure)
Brine may have to be added a couple of times during the first year in connection with ventilation of
the ground source loop.
Filling the ground source loop with brine
The brine in the ground source loop comprises water and antifreeze. Ethanol, IPA alcohol, eth-
ylene glycol or propylene glycol.
The heat pump is equipped with a low-pressure switch, which ensures that the brine never be-
comes so cold that it freezes solid, and thus the ground source heat pump's heat exchanger is
protected against frost damage.
The frost protection mixture must be adapted to the operating temperatures in the ground source
loop. It is very important that the frost protection fluid is mixed thoroughly before it is added to the
ground source loop as no mixing takes place in the ground pipes. Failure to do so increases the
risk of the heat pump freezing, thus creating a potential risk of frost damage. Brine may only be
added/topped up by an authorised technician. Before loading, check that the ground coils are tight.
How to fill brine into the ground source loop before start:
•
The heat pump and circulation pump is switched off at the main switch before filling brine / anti-
freeze in the system
•
There blocked on one valve at the circulating pump in the collector circuit Figure 13, point 18
•
Using a combined mixing and aeration tank equipped with a powerful filling pump filled brine of
geothermal loop through filling taps Figure 13, point 13, until the geothermal pipe is vented. Du-
ration at least 1 hour.
•
Shut-off valve at the circulating pump in the collector circuit Figure 13, point 18, opened again
and the heat pump section is filled and vented now, as ground circuit
If brine has to be repeatedly added to the ground source loop, this indicates that the ground pipes
are leaking.
ALWAYS contact an authorised service technician immediately if you suspect leakage.
Water pressure in the central heating loop
The water pressure in the central heating loop must initially be inspected as often as several times
a day. Top up the system with water, if necessary, see Figure 13, point 13
The water pressure will stabilise after a few days and inspection can then be reduced to once a
month. If you have to add water to the central heating loop beyond the start-up phase, the system
must be checked for leaks.
