Filling And Discharge Circuits; Filling The Production Circuit (Heating, Cooling, Dhw And Pool); Filling The Source Circuit - GeoSmart NETZERO BW Manual Instalador

4. Filling and discharge circuits

D
▪
uring filling work on the hydraulic circuits, take special care to prevent liquid from spilling on the
DANGER!
internal electrical heat pump components, which could cause personal injury due to electrocution
and/or poor equipment operation.

4.1. Filling the production circuit (heating, cooling, DHW and pool)

The heat pump is equipped with internal filling / discharge valves for the production circuit. It is recommended to use these valves
to ensure that the internal circuits are completely bled. Take the following steps to fill the circuit.
1. Open all the valves of the production circuits.
2. Fill the circuit through the filling valve until the target pressure is reached. Make sure that the pressure does not exceed 3
bar (pressure gauge) under any circumstance.
3. Remove the air from the circuit using the traps installed for that purpose.
4. Check the circuit pressure and repeat the filling process if necessary.
The NETZERO CW models are equipped with a manual trap at the entry to the coil to bleed the DHW production circuit.
Figure 4.1.Bleeding the DHW production circuit in NETZERO CW models.

4.2. Filling the source circuit

The source system temperature can fall below 0°C, so a mixture of water/antifreeze must be used. It is recommended to use
propylene glycol as an antifreeze additive or ethylene glycol with a corrosion inhibitor. Please check local regulations before using
any type of antifreeze mixture.
When preparing the mixture, be careful to calculate the volume of antifreeze necessary to reach the desired degree of antifreeze
protection. It is recommended to use a mixture with a freezing point at least 10ºC below the nominal minimum temperature.
Source circuit filling should be done with the filling unit installed in the return pipe and an external circulation pump, taking the
following steps.
1. Prepare the appropriate proportions of antifreeze mixture in external tank A.
2. Connect the external recirculation pump outlet to valve D.
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Manual trap
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Installer manual NETZERO