Maintenance; Check Point; Check Before Test Run - LG Therma V AHUW056A3 Engineering Product Data Book

THERMA V
Split Type
9. Installation

9.6.3 Maintenance

To assure best performance of THERMA V, it is required to perform periodical check and maintenance. It
isrecommended to proceed following check list for once a year.
Turn off the power before proceeding maintenance
No. Category
1
Water
2
3
4 Electricity

9.6.4 Check before Test run

Check to see whether there is any refrigerant leakage, and check whether the power or transmission
1
cable is connected properly.
Confirm that 500 V megger shows 2.0 MΩ or more between power supply terminal block and ground. Do
not operate in the case of 2.0 MΩ or less.
Note
Never carry out mega ohm check over terminal control board.Otherwise the control board may break.
2
Immediately after mounting the unit or after leaving it turned off for an extended length of time, the
resistance of the insulation between the power supply terminal board and the ground may decrease to
approx. 2.0 MΩ as a result of refrigerant accumulation in the internal compressor.
If the insulation resistance is less than 2.0 MΩ, turn on the main power supply.
24
Item
• In normal state, the pressure gage (in front of the indoor
Water pressure
• If the pressure is less than 0.3 bar, please recharge the
• Close the shut-off valves and disassemble strainer.
Strainer (Water filter)
• While disassembling the strainer, be careful for water
• Open the switch of the safety valve and check if water is
Safety valve
• After checking, close the safety valve.
Terminal block wiring • Look and inspect if there is loosen or defected

Check Point

unit) should indicate 2.0~2.5 bar.
water.
Then wash the strainer to make it clean.
flood out.
flood out through the drain hose.
connection on the terminal block.
Hydro Box Unit