Connecting Pipings And The Cable To Outdoor Unit - LG LMNH122LRA0 Service Manual

Installation

Connecting Pipings and the cable to Outdoor unit

1. Connecting the pipings to the Outdoor
unit
1) When piping installation work you must be
used the connector.
Indoor Units
24K/30K/36K Ø12.7
A
*Connecting pipe size
Indoor Units Gas Side
12K/18K Ø12.7(1/2)
24K/30K/36K Ø15.88(5/8)
CAUTION: After the confirmation of the above conditions, prepare the wiring as
follows:
1) Never fail to have an individual power specialized for the air conditioner. As for the method of
wiring, be guided by the circuit diagram pasted on the inside of control box cover.
2) The means for disconnection from a power supply shall be incorporated in the fixed wiring
and have an air gap contact separation of at least 3mm in each active(phase) conductors.
3) The screw which fasten the wiring in the casing of electrical fittings are liable to come loose
from vibrations to which the unit is subjected during the course of transportation. Check them
and make sure that they are all tightly fastened. (If they are loose, it could give rise to burn-out
of the wires.)
4) Specification of power source.
5) Confirm that electrical capacity is sufficient.
6) See to 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) Never fail to equip a leakage breaker where it is wet or moist.
9) The following troubles would be caused by voltage drop-down.
• Vibration of a magnetic switch, damage on the contact point there of, fuse breaking, disturbance to
the normal function of a overload protection device.
• Proper starting power is not given to the compressor.
42 Multi type Air Conditioner
Gas
Liquid
A B
Ø15.88 Not available
B
Liquid Side
Ø6.35(1/4)
Ø6.35(1/4)
2) Align the center of the pipings and sufficiently
tighten the flare nut by hand
3) Finally, tighten the flare nut with torque wrench
until the wrench clicks.
When tightening the flare nut with torque wrench,
ensure the direction for tightening follows the arrow on
the wrench.
Outdoor unit
B-UNIT
A-UNIT
Liquid side
piping
Connector
Torque wrench
Gas side
piping