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Piping and Wiring for Indoor Unit
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, sanitary water tank circuit, FCU water
circuit, and any other water circuits controlled by the product.
Step 2. Connect supply water into drain valve and fill valve located at the side of the shut-off valve.
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. Sudden water 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 performance degrade, 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 water charging inside expansion vessel.
• No air purging sound is heard or no water drop are popping out from air vent.
Pipe Insulation
Purpose of water pipe insulation is :
• To prevent heat loss to external environment
• To prevent dew generation on the surface of the pipe in cooling operation
54 Air-to-Water Heat Pump
Water In
Water Out
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Troubleshooting
