LG THERMA V AHNW16606B0, Installation Manual, Page: 53 / 65

Piping and Wiring for Outdoor Unit
Installation Manual 53
ENGLISH
After checking and confirming following conditions, start the wiring work.
1. Secure dedicated power source for the Air-to-Water heat pump. See the wiring diagram
provided with the control box of the indoor unit.
2. Provide a circuit breaker switch between power source and the outdoor unit.
3. Rarely, the screws used to fasten internal wires become loose due to the vibration faced while
transportation of the product. Check these screws and ensure that if they are all fastened
tightly. If not tightened, the wire can be short-circuited.
4. Check the specification of power source such as phase, voltage, frequency, etc.
5. Confirm that the electrical capacity is sufficient.
6. Ensure that the starting voltage is maintained at more than 90 percent of the rated voltage
marked on the name plate.
7. Confirm that the cable thickness is as specified in the power sources specification. (Particularly
note the relation between cable length and thickness.)
8. Provide an ELB(electric leakage breaker) when the installation place is wet or moist.
9. The following issues are caused by abnormal voltage supply such as sudden voltage
increasing or voltage drop-down.
• Chattering of a magnetic switch (frequent on and off operation)
• Physical damage of parts where magnetic switch is contacted
• Break of fuse
• Malfunction of overload protection parts or related control algorithms.
• Failure of compressor start up
10. Ground wire to ground outdoor unit to prevent electrical shock.
When connecting power cable, make sure the
rubber bushes are properly attached in knock-out
holes after removing the Insulation pad.
Control Terminal
(Terminal for
Connecting Cable)
Main Power
Terminal
(Terminal for
Power Cable)
Cable Clamp
(or Cord Clamp)
Cable Clamp
(or Cord Clamp)
Insulation pad
Side Panel
Wiring Procedure for Power Cable and Connecting Cable
Step 1. : Disassemble the side panel from the outdoor unit by loosing screws.
Step 2. : Connect the Power Cable to the Main Power Terminal and Connecting cable to Control
Terminal, respectively.
See the below figure for detailed information. When connecting earth cable, the diameter
of cable should be bigger than 1.6 mm
2 to secure it safety. The place where the earth
cable is connected to the terminal block is indicated by the earth symbol .
Step 3. : Use cable clamps (or cord clamps) to prevent unintended move of Power cable and
Connecting the cable.
Step 4. : Reassemble the side panel to the outdoor unit by tightening the screws firmly.