LG Therma V AHUW056A3 Engineering Product Data Book page 29

THERMA V
Split Type
9. Installation
9.4 Water charging
For water charging, please follow below procedures.
• Step 1
Open all valves of whole water circuit. Supplied water should be charged not only inside the indoor unit, but also
in the under floor water circuit, DHW tank circuit, FCU water circuit, and any other water circuitscontrolled by the
product.
• Step 2
Connect supply water into drain valve and fill valve located at the side of the shut-off valve.
CAUTION
• No water-leakage permitted at the drain and fill valve.
Leakage-proof treatment which is described in previous section
should be applied
• Step 3
Start to supply water. While supplying water, following should be kept.
– Pressure of supplying water should be 2.0 bar approximately.
– For supplying water pressure, time to be taken from 0 bar to 2.0 bar should be more than 1 minute.
Suddenwater supply can yield water drain through safety valve.
– Fully open the cap of air vent to assure air purging. If air is exist inside the water circuit, then
performancedegrade, noise at the water pipe, mechanical damage at the surface of electric heater coil.
• Step 4
Stop water supplying when the pressure gage located in front of the control panel indicates 2.0 bar.
• Step 5
Close drain valve and fill valve. Then wait for 20~30 seconds to observe water pressure being stabilized.
• Step 6
If following conditions are satisfactory, then go to step 7(pipe insulation). Otherwise, go to step 3.
– Pressure gage indicates 2.0 bar. Note that sometimes pressure in decreased after step 5 due to
watercharging inside expansion vessel.
– No air purging sound is heard or no water drop are popping out from air vent.
20
Hydro Box Unit
※ According to each model, shut off valve
external appearance, direction, location etc
could be different slightly.