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INSTALLATION
66
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 unit, but also in the under floor water circuit, DHW 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.
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 pre-adjust value approximately.
- For supplying water pressure, time to be taken from 0 bar to pre-adjust value 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.
- Open both the air vent in the water pipe and the air vent in the pump.
Step 4. Stop water supplying when the pressure gauge located in front of the control panel
indicates pre-adjust value.(For 3 Series)
Stop water supplying when the pressure located in remote control indicates pre-adjust
value.(For 4 Series)
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 Next process(Pipe Insulation).
Otherwise, go to step 3.
- Pressure gage indicates pre-adjust value. 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.
CAUTION
!
Keep the air vent of the water pipe open and keep the air vent of the pump closed.
Otherwise, the pump may make noise.
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