Installation and User Manual. Version V03.B03_EN (23/09/2015)
ecoGEO
65
ECOFOREST Geotermia
9.3. FILLING THE BRINE CIRCUIT
The brine system temperature may drop below 0 ºC, so a mixture of water antifreeze with a freezing point
around -17 ± 2 ºC should be used. It is recommended to use a propylene glycol antifreeze (max. 33% by
volume) or ethylene glycol (max. 30% by volume) with corrosion inhibitor.
The estimated volume of the antifreeze mixture required to fill the brine circuit must be calculated taking into
account the following.
Heat pumps (exch pipes + expansion vessel, 5 litres).
Brine pipe per lineal meter. It is not recommended to use pipes with diameters lower than those
shown in Table 9.1 as the high speeds of circulation of liquid may cause noise and corrosion
problems.
Type of piping
Inner diameter (mm)
Volume (l/m)
PEM DN 40
36
1
PEM DN 32
28
0.6
Cooper 28
25.6
0.5
Table 9.1.
Volume calculation per lineal meter of pipe.
Filling the brine circuit must be done through an external filling pump, as indicated in Figure 9.2, following
these steps.
1. Prepare the antifreeze mixture in properly concentration in the external tank (11).
2. Connect the outlet port of the filling pump (10) to the filling valve C (9).
3. Connect a transparent hose from the filling valve B (8) to the external antifreeze tank so that its end
is immersed.
4. Close the filling valve A (7).
5. Open the filling valves B and C.
6. Activate the external filling pump to fill the circuit.
7. Activate in manual mode the brine circuit pump (INSTALLER MENU -> CONFIGURATION ->
MANUAL TEST -> BRINE PUMP -> State, switch the value to ON) in order to facilitate the circulation
of the antifreeze mixture through the circuit.
8. Keep the external filling pump and the brine pump running until no air bubbles are seen in the fluid
that goes through the transparent hose to the antifreeze mixture tank.
NOTE
Before filling the brine circuit, it is necessary to complete the electrical installation so that the brine
pump can be activated.
Check the local regulations before using any kind of antifreeze mixture.
DANGER!
During the filling of the brine circuit, special care must be taken to avoid getting antifreeze mixture on
the electrical panel as it may cause personal injury from electric shock and/or cause equipment
malfunction.
