Connecting Pipings And The Cable To Outdoor Unit; Connecting The Pipings To The Outdoor Unit; Connecting Pipe Size - LG A2UN186FA0 Service Manual

(5) 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
A
12K
18K Ø9.52 Ø12.7
24K
A

*Connecting pipe size

Indoor Units Gas side
7K Ø9.52(3/8)
9K Ø9.52(3/8)
12K Ø12.7(1/2)
18K Ø12.7(1/2)
24K Ø12.7(1/2)
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.
Gas Liquid
B A
Not necessary
B
Liquid side
Ø6.35(1/4)
Ø6.35(1/4)
Ø6.35(1/4)
Ø6.35(1/4)
Ø6.35(1/4)
2. Align the center of the pipings and sufficiently tight-
en the flare nut by hand
B
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
Connector
Torque
wrench
CAUTION
- 60 -
Connector
Liquid side piping
C-UNIT
B-UNIT
A-UNIT
Gas side piping