Test Run Checklist; Troubleshooting Main Components - LG Multi V5 Service Manual

Be aware of the following safety precautions when troubleshooting the main components.
DANGER
• High voltage electricity is required to operate this system. Adhere to the NEC code and these instructions when wiring. Improper connec-
tions and inadequate grounding can cause accidental injury or death.
• Turn the power off before servicing the equipment. Electrical shock can cause physical injury or death.
• Do not operate the disconnect switch with wet hands. There is risk of fire, electric shock, physical injury or death.
WARNING
• Disconnects must only be performed by a properly licensed electrician. Incorrect wiring could cause the disconnect to explode, leading to
physical injury or death.
• Do not supply power to the unit until all electrical wiring and controls wiring are completed. There is risk of fire, electric shock, physical
injury or death.
• Do not operate the unit with the panel(s) or protective cover(s) removed; keep fingers and clothing away from moving parts. The rotat-
ing, hot, cold, and high-voltage parts of the unit can cause physical injury or death.
• Do not touch the refrigerant piping during or after operation. It can cause burns or frostbite.
• Do not supply power to the unit until all electrical wiring and controls wiring are completely installed. The system will malfunction.
• If the power wiring and communication cables are not properly connected (connections switched), the communication components will burn
out and the system will not operate.

Test Run Checklist

Table 58: Test Run Checklist.
Check for any refrigerant leaks in the piping system.
1
Verify that all power wiring and communication cables are properly connected. Check for disconnected and loose power wiring and
communication cables connections.
Measure the insulation resistance between the power supply terminal block and ground using a mega-tester device (DC 500V). Resis-
2
• Never perform the megaohm check on the terminal control board. This will damage the control board.
• Immediately after installation, or if the system is off for a long period, refrigerant can accumulate in the compressor, which can cause
refrigerant evaporates, which will cause the insulation resistance to increase.
For Heat Recovery Systems: Check if the liquid, high pressure vapor, and low pressure vapor piping valves are fully opened.
For Heat Pump Systems: Check if the liquid and vapor piping valves are fully opened. Verify that the valve for the middle piping (not
used for heat pump systems) is completely closed.
3
Tighten all caps on the liquid and gas (vapor) service valves.
• Check for any problems in the automatic addressing.
4
• Check / confirm that there are no error messages displayed on the indoor units, wired controllers, or the outdoor unit(s) SSD(s).
do not operate the unit.
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Heat Recovery Systems Heat Pump Systems
Low Pressure Not Used
High Pressure
Vapor Piping
Vapor Piping
Liquid Piping Liquid Piping
TEST RUN
Vapor Piping
111