LG 5BPU0-02C, Engineering Product Data Book

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8. Starting Operation
27
THERMA V
Split Type
Design and installation
8.3 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
8.4 Check before Starting Operation
No. Category Item Check Point
1
Water
Water pressure
• In normal state, the pressure gage (in front of the indoor
unit) should indicate 2.0~2.5 barG.
• If the pressure is less than 0.3 barG, please recharge the
water.
2 Strainer (Water filter)
• Close the shut-off valves and disassemble strainer.
Then wash the strainer to make it clean.
• While disassembling the strainer, be careful for water
flood out.
3 Safety valve
• Open the switch of the safety valve and check if water is
flood out through the drain hose.
• After checking, close the safety valve.
4 Electricity Terminal block wiring • Look and inspect if there is loosen or defected
connection on the terminal block.
1
Check to see whether there is any refrigerant leakage, and check whether the power or transmission
cable is connected properly.
2
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.
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.