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PIPING AND WIRING FOR INDOOR UNIT
74
Water Charging
For water charging, please follow below procedures.
For DHW Tank
Step 1. Open all hot water tap.
Step 2. Open the cold water supply valve to fill DHW Tank.
Step 3. Close all water taps after air is purged.
For space heating
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.
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. 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 (Air purge is located at the top of the heater.).
- Use the "pump test run" function. (both a space heating line and a DHW line are open
during the pump test run operation.)
Step 4. Stop water supplying when the pressure gauge 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 check the pipe insulation.
Otherwise, go to step 3.
- Pressure gauge 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.
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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