LG THERMA V Installation Manual page 62

PIPING AND WIRING FOR OUTDOOR UNIT
62
Wiring Procedure for Power Cable
and Connecting Cable
Liquid Piping
Step 1. Disassemble the cover from the
outdoor unit by loosing screws.
Step 2. Connect Power cable to Main Power
Terminal and Connecting cable to
Control Terminal, respectively.
See below figure for detailed
information. When connecting earth
cable, the diameter of cable should be
bigger than 2.5 mm
The earth cable is connected to the
terminal block where earth symbol
is marked.
Step 3. Use cable clamps (or cord clamps) to
prevent unintended move of Power
cable and Connecting cable.
Step 4. Reassemble the cover to the
outdoor unit by fastening screws.
Water
Water Water Water
Outlet
Inlet Inlet Inlet
Connecting
Cable
Power Cable
Cover
Gas
Piping
2 to secure safety.
CAUTION
!
After checking and confirming following
conditions, start wiring work.
• Secure dedicated power source for the
Air-to-Water heat pump. The wiring
diagram (attached inside the control
box of the indoor unit) is presenting
related information.
• Provide a circuit breaker switch
between power source and the
outdoor unit.
• Although it is very rare case,
sometimes the screws used to fasten
internal wires can be loosen due to the
vibration while product transportation.
Check these screws and make it sure if
they are all fastened tightly. If not
tightened, burn-out of the wire can be
occurred.
• Check the specification of power
source such as phase, voltage,
frequency, etc.
• Confirm that electrical capacity is
sufficient.
• Be sure that the starting voltage is
maintained at more than 90 percent of
the rated voltage marked on the name
plate.
• Confirm that the cable thickness is as
specified in the power sources
specification. (Particularly note the
relation between cable length and
thickness.)
• Provide an ELB(electric leakage
breaker) when the installation place is
wet or moist.
• The following troubles would be
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.
• Ground wire to ground outdoor unit to
prevent electrical shock.