LG AS-H186V_L1_L2 Service Manual ▷ View online
Service Manual 21
Installation
Outdoor
1. Remove the control cover from the unit by loosening
the screw.
Connect the wires to the terminals on the control
board individually.
Connect the wires to the terminals on the control
board individually.
2. Secure the cable onto the control board with the cord
clamp.
3. Refix the control cover to the original position with the
screw.
4. Use a recognized circuit breaker 20A(14k) between
the power source and the unit.
A disconnecting device to adequately disconnect all
supply lines must be fitted.
A disconnecting device to adequately disconnect all
supply lines must be fitted.
Terminal block
Over 5mm
Cover control
Connecting cable
Connecting cable
Outdoor Unit
7k~14k
18k
24k~28k 30k, 32k 36k, 38k
15
20
30
30
40
Circuit
Breaker
(A)
Grade
CAUTION: According to the confirmation of the above conditions, prepare the
wiring as follows.
wiring as follows.
1. Never fail to have an individual power circuit specifically for the air conditioner. As for the method of
wiring, be guided by the circuit diagram posted on the inside of control cover.
2. 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 cause burn-out of the wires.)
sure that they are all tightly fastened. (If they are loose, it could cause burn-out of the wires.)
3. Specification of power source.
4. Confirm that electrical capacity is sufficient.
5. See to that the starting voltage is maintained at more than 90 percent of the rated voltage marked on
the name plate.
6. Confirm that the cable thickness is as specified in the power source specification.
(Particularly note the relation between cable length and thickness.
7. Always install an earth leakage circuit breaker in a wet or moist area.
8. The following would be caused by voltage drop.
• Vibration of a magnetic switch, which will damage the contact point, fuse breaking, disturbance of the normal function
of the overload.
9. 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.
22 Room Air Conditioner
Installation
Checking the Drainage
To check the drainage.
1. Pour a glass of water on the evaporator.
2. Ensure the water flows through the drain hose of the
indoor unit without any leakage and goes out the
drain exit.
drain exit.
Drain piping
1. The drain hose should point downward for easy drain
flow.
2. Do not make drain piping like the following.
Downward slope
Do not raise
Accumulated
drain water
drain water
Tip of drain hose
dipped in water
dipped in water
Air
Waving
Water
leakage
leakage
Water
leakage
leakage
Ditch
Less than
50mm gap
50mm gap
Water
leakage
leakage
Service Manual 23
Installation
Forming the Piping
Form the piping by wrapping the connect-
ing portion of the indoor unit with insula-
tion material and secure it with two kinds
of vinyl tapes.
ing portion of the indoor unit with insula-
tion material and secure it with two kinds
of vinyl tapes.
• If you want to connect an additional drain hose, the
end of the drain outlet should be routed above the
ground. Secure the drain hose appropriately.
ground. Secure the drain hose appropriately.
In cases where the outdoor unit is
installed below the indoor unit perform the
following.
installed below the indoor unit perform the
following.
1. Tape the piping, drain hose and connecting cable
from down to up.
2. Secure the tapped piping along the exterior wall
using saddle or equivalent.
In cases where the outdoor unit is
installed above the Indoor unit perform the
following.
installed above the Indoor unit perform the
following.
1. Tape the piping and connecting cable from down to
up.
2. Secure the taped piping along the exterior wall. Form
a trap to prevent water entering the room.
3. Fix the piping onto the wall by saddle or equivalent.
Taping
Drain hose
Pipings
Connecting cable
Trap is required to prevent water
from entering electrical parts.
from entering electrical parts.
Seal small openings
around pipings with a
gum type sealer.
around pipings with a
gum type sealer.
Seal a small opening
around the pipings
with gum type sealer.
around the pipings
with gum type sealer.
Trap
Trap
24 Room Air Conditioner
Installation
Air Purging
Air purging
The air and moisture remaining in the refrigerant system have undesirable effects as indicated below.
1. Pressure in the system rises.
2. Operating current rises.
3. Cooling(or heating) efficiency drops.
4. Moisture in the refrigerant circuit may freeze and block capillary tubing.
5. Water may lead to corrosion of parts in the refrigeration system.
Therefore, after evacuating the system, take a leak test for the piping and tubing between the indoor and outdoor unit.
2. Operating current rises.
3. Cooling(or heating) efficiency drops.
4. Moisture in the refrigerant circuit may freeze and block capillary tubing.
5. Water may lead to corrosion of parts in the refrigeration system.
Therefore, after evacuating the system, take a leak test for the piping and tubing between the indoor and outdoor unit.
Air purging with vacuum pump
1. Preparation
• Check that each tube(both liquid and gas side tubes) between the indoor and outdoor units have been properly connected and
all wiring for the test run has been completed. Remove the service valve caps from both the gas and the liquid side on the out-
door unit. Note that both the liquid and the gas side service valves on the outdoor unit are kept closed at this stage.
door unit. Note that both the liquid and the gas side service valves on the outdoor unit are kept closed at this stage.
2. Leak test
• Connect the manifold valve(with pressure gauges) and dry nitrogen gas cylinder to this service port with charge hoses.
CAUTION: Be sure to use a manifold valve for air purging. If it is not available, use a stop
valve for this purpose. The "Hi" knob of the manifold valve must always be kept close.
valve for this purpose. The "Hi" knob of the manifold valve must always be kept close.
• Pressurize the system to no more than 150 P.S.I.G. with dry nitrogen gas and close the cylinder valve when the gauge
reading reached 150 P.S.I.G. Next, test for leaks with liquid soap.
CAUTION: To avoid nitrogen entering the refrigerant system in a liquid state, the top of the cylinder
must be higher than its bottom when you pressurize the system. Usually, the cylinder is used in a verti-
cal standing position.
must be higher than its bottom when you pressurize the system. Usually, the cylinder is used in a verti-
cal standing position.
1. Do a leak test of all joints of the tubing(both indoor and outdoor) and both gas and liquid side service valves.
Bubbles indicate a leak. Be sure to wipe off the soap with a clean cloth.
2. After the system is found to be free of leaks, relieve the nitrogen pressure by loosening the charge hose connector at
the nitrogen cylinder. When the system pressure is reduced to normal, disconnect the hose from the cylinder.
Lo
Hi
Indoor unit
Outdoor unit
Manifold valve
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
cylinder(in vertical
standing position)
Pressure
gauge
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