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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.
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. Stop water supplying when the pressure located in remote control
indicates pre-adjust value.
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 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. Close all air vents once water is spilled from the vents.
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
- Minimum insulation thickness recommendations
ensure correct operation of the product, but local regulations may vary and must be followed.
- If Cooling function is used, the type of insulation must be suited for cold water and all joints must
be sealed tightly to prevent that the insulation becomes wet from the inside.
Water Piping length (m)
20~30
30~40
40~50
* λ = 0.04 W/mk (Thermal conductivity of pipe insulation)
<20
WATER PIPING
Minimum insulation Thickness(mm)
20
30
40
50
61
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