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Service Manual 45
Troubleshooting Guide
Troubleshooting Guide
INDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
OUTDOOR UNIT
HEAT
EXCHANGE
(EVAPORATOR)
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(EVAPORATOR)
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
EXCHANGE
(CONDENSER)
HEAT
EXCHANGE
(CONDENSER)
EXCHANGE
(CONDENSER)
COMPRESSOR
COMPRESSOR
ACCUMU
LATOR
LATOR
GAS SIDE
GAS SIDE
3-WAY VALVE
LIQUID SIDE
LIQUID SIDE
3-WAY VALVE
CAPILLARY TUBE
CAPILLARY TUBE
CHECK VALVE
(Heating Model only)
COOLING
HEATING
REVERSING
VALVE
(Heating Model Only)
VALVE
(Heating Model Only)
(1) Cooling Only Models
Refrigeration Cycle Diagram
(2) Cooling & Heating Models
46 Room Air Conditioner
Troubleshooting Guide
CAUTION:* Capicity is based on standard length and maximum allowance length
is the basis of reliability.
* Oil trap should be installed per 5~7 meters.
Outdoor unit
Indoor unit
A
B
A
Oil trap
Outdoor unit
Indoor unit
B
In case more than 5m
7k~14k
3/8"(Ø9.52)
1/4"(Ø6.35)
4 or 7.5
7
15
20
1/2"(Ø12.7)
1/4"(Ø6.35)
4 or 7.5
7
15
20
1/2"(Ø12.7)
1/4"(Ø6.35)
4 or 7.5
15
30
20
18k~28k
5/8"(Ø15.88)
1/4"(Ø6.35)
4 or 7.5
15
30
20
5/8"(Ø15.88)
3/8"(Ø9.52)
4 or 7.5
15
30
30
30k~38k
5/8"(Ø15.88)
3/8"(Ø9.52)
7.5
15
30
30
3/4"(Ø19.05)
3/8"(Ø9.52)
7.5
15
30
50
Pipe Size
Capacity
(Btu/h)
GAS
LIQUID
Additional
Refrigerant
(g/m)
Max.
Length
A (m)
Max.
Elevation
B (m)
Standard
Length
(m)
Pipe Length and the Elevation
Service Manual 47
Troubleshooting Guide
2-way, 3-way Valve
2-way Valve (Liquid Side)
3-way Valve (Gas Side)
Shaft position
Shaft position
Service port
Closed
Closed
Closed
(with valve cap)
(with valve cap)
(with cap)
Open
Closed
Open
(counter-clockwise)
(clockwise)
(push-pin or with
vacumm pump)
Open
Open
Closed
(with valve cap)
(with valve cap)
(with cap)
Closed
Open
Open
(clockwise)
(counter-clockwise)
(connected manifold
gauge)
Open
Open
Open
(with charging
cylinder)
Open
Open
Open
(with charging
cylinder)
Open
Open
Open
Open
Works
Shipping
Air purging
(Installation)
(Installation)
Operation
Pumping down
(Transfering)
(Transfering)
Evacuation
(Servicing)
(Servicing)
Gas charging
(Servicing)
(Servicing)
Pressure check
(Servicing)
(Servicing)
Gas releasing
(Servicing)
(Servicing)
1.
2.
3.
4.
5.
6.
Valve cap
Open position
Closed position
Closed position
Pin
Service
port
port
Service
port cap
port cap
To outdoor unit
Flare nut
To
piping
connection
piping
connection
To outdoor unit
Hexagonal wrench (4mm)
Open position
Closed position
Closed position
To
piping
connection
piping
connection
Flare nut
Open
(with charging cylinder)
Open
(with charging cylinder)
48 Room Air Conditioner
Troubleshooting Guide
Required tools : hexagonal wrench, adjustable wrench,
torque wrenches, wrench to hold the
joints, and gas leak detector.
joints, and gas leak detector.
The additional gas for air purging has been charged
in the outdoor unit.
However, if the flare connections have not be done
correctly and there gas leaks, a gas cylinder and the
charge set will be needed.
in the outdoor unit.
However, if the flare connections have not be done
correctly and there gas leaks, a gas cylinder and the
charge set will be needed.
The air in the indoor unit and in the piping must be
purged. If air remains in the refrigeration pipes, it will
affect the compressor, reduce to cooling capacity,
and could lead to a malfunction.
purged. If air remains in the refrigeration pipes, it will
affect the compressor, reduce to cooling capacity,
and could lead to a malfunction.
• Procedure
(1) Recheck the piping connections.
(2) Open the valve stem of the 2-way valve coun-
terclockwise approximately 90°, wait 10 sec-
onds, and then set it to closed position.
– Be sure to use a hexagonal wrench to operate
onds, and then set it to closed position.
– Be sure to use a hexagonal wrench to operate
the valve stem.
(3) Check for gas leakage.
– Check the flare connections for gas leakage.
(4) Purge the air from the system.
– Set the 2-way valve to the open position and
remove the cap from the 3-way valve’s service
port.
port.
– Using the hexagonal wrench to press the valve
core pin, discharge for three seconds and then
wait for one minute. Repeat this three times.
wait for one minute. Repeat this three times.
(5) Use torque wrench to tighten the service port
nut to a torque of 1.8kg.cm.
(6) Set the 3-way valve to the back seat.
(7) Mount the valve stem nuts to the 2-way and 3-
way valves.
(8) Check for gas leakage.
– At this time, especially check for gas leakage
from the 2-way and 3-way valve’s stem nuts,
and from the service port nut.
and from the service port nut.
Service port nut:
Be sure, using a torque wrench to tighten the service port nut (after using the service port), so that it prevents the
gas leakage from the refrigeration cycle.
Be sure, using a torque wrench to tighten the service port nut (after using the service port), so that it prevents the
gas leakage from the refrigeration cycle.
CAUTION: Do not leak the gas in the air during Air purging.
CAUTION: If gas leakage are discovered
in step (3) above, take the following
mesures :
in step (3) above, take the following
mesures :
If the gas leaks stop when the piping connections
are tightened further, continue working from step (4).
If the gas leaks do not stop when the connections
are retightened, repair the location of the leak, dis-
charge all of the gas through the service port, and
then recharge with the specified amount of gas from
a gas cylinder.
are tightened further, continue working from step (4).
If the gas leaks do not stop when the connections
are retightened, repair the location of the leak, dis-
charge all of the gas through the service port, and
then recharge with the specified amount of gas from
a gas cylinder.
Liquid side
Outdoor unit
3-way
valve
valve
Gas side
Indoor unit
2-way
valve
valve
Open
Clsed
Air purging
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