Pipe Insulation - LG HM031M Engineering Product Data Book

6. Installation
6.4 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 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.
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.
• About 2 turns open the cap of air vent to assure air purging (Refer to Figure 1). 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 inside unit 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 next(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
Procedures
1. Cover of electronic heater should be removed.
2. About 2 turns open the cap of air vent
11 _
Air-to-Water Heat Pump
Remove
the cover
<Figure 1>
About 2 turns open