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Service Manual 21
Connect the cable to the Indoor unit.
Connecting the cable between indoor unit and outdoor unit
• Connect the cable to the indoor unit by connecting the wires to the terminals on the control board individually according to
the outdoor unit connection. (Ensure that the color of the wires of the outdoor unit and the terminal No. are the same as
those of the indoor unit.). The earth wire should be longer than the common wires.
The above circuit diagram is subject to change without notice.
When installing, refer to the circuit diagram on the control box
inside Indoor Uint.
those of the indoor unit.). The earth wire should be longer than the common wires.
The above circuit diagram is subject to change without notice.
When installing, refer to the circuit diagram on the control box
inside Indoor Uint.
Air
Conditioner
Main power source
Circuit Breaker
Use a circuit
breaker or time
delay fuse.
Use a circuit
breaker or time
delay fuse.
NORMAL
CROSS-SECTIONAL
AREA 0.75mm
CROSS-SECTIONAL
AREA 0.75mm
2
The power connecting cable connected to
the indoor and outdoor unit should be
complied with the following specifications
(Type "B" approved by HAR or SAA).
the indoor and outdoor unit should be
complied with the following specifications
(Type "B" approved by HAR or SAA).
The power cord connected to the "A" unit
should be complied with the following
specifications(Type "B" approved by HAR or
SAA).
should be complied with the following
specifications(Type "B" approved by HAR or
SAA).
(mm
2
)
• The above circuit diagram is subject to change without
notice.
• Be sure to connect wires according to the wiring diagram.
• Connect the wires firmly, so that not to be pulled out easily.
• Connect the wires according to color codes by referring the
wiring diagram.
• If a power plug is not to be used, provide a circuit
breaker between power source and the unit as
shown below.
shown below.
Connecting the cable between indoor unit and outdoor unit
• When installing, refer to the circuit diagram on the
Control Box of Indoor Unit.
• When installing, refer to the wiring diagram on the
Control Cover Inside Outdoor Unit.
5k~9k
12k
14K~18k 24k~28k 30k, 32k 36k, 38k
0.75
1.0
1.5
2.5
2.5
5.5
Unit(A)
Indoor
Indoor
Indoor
Indoor
Outdoor Outdoor
Cable Type(B) H05VV-F H05VV-F H05VV-F H05VV-F H05RN-F H05RN-F
NORMAL CROSS
-SECTIONAL AREA
Grade
5k~12k 14k~18k 24k~28k
1.0
1.5
2.5
Cable Type(B) H07RN-F H07RN-F H07RN-F
NORMAL
CROSS
-SECTIONAL
AREA
Grade
(mm
2
)
30k, 32k
36k, 38k
0.75
0.75
Cable Type(B) H07RN-F H07RN-F
NORMAL CROSS
-SECTIONAL AREA
Grade
(mm
2
)
22 Room Air Conditioner
Connecting the cable between indoor unit and outdoor unit
Remove the control cover from the unit by
loosening the screw.
loosening the screw.
Connect the wires to the terminals on the con-
trol board individually.
trol board individually.
Secure the cable onto the control board with
the cord clamp.
the cord clamp.
Refix the control cover to the original position
with the screw.
with the screw.
Use a recognized circuit breaker "A"
between the power source and the unit.
A disconnecting device to adequately discon-
nect all supply lines must be fitted.
between the power source and the unit.
A disconnecting device to adequately discon-
nect all supply lines must be fitted.
Terminal block
Over 5mm
Cover control
Connecting cable
Connecting cable
After the confirmation of the above conditions, prepare the wiring as follows:
1) Never fail to have an individual power circuit specifically for the air conditioner. As for the method of wiring,
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.)
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
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. (Refer to page 21))
7) Always install an earth leakage circuit breaker in a wet or moist area.
8) The following would be caused by voltage drop.
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 func-
tion 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.
Outdoor Unit
Connect the cable to the outdoor unit
5k~14k
18k
24k~28k 30k, 32k 36k, 38k
15
20
30
30
40
Circuit
Breaker
(A)
Grade
Service Manual 23
Checking the drainage and forming the pipings
Checking the drainage and forming the pipings
Checking the drainage
Form the piping
To remove the front panel from the indoor unit.
• Set the air direction louvers up-and-down to the
position(horizontally) by hand.
• Remove the securing screws that retain the front panel.
Pull the lower left and right sides of the grille toward you
and lift it off.
and lift it off.
Form the piping by wrapping the connecting
portion of the indoor unit with insulation mate-
rial and secure it with two kinds of vinyl tapes.
portion of the indoor unit with insulation mate-
rial 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.
the drain hose appropriately.
In cases where the outdoor unit is installed
below the indoor unit perform the following.
below the indoor unit perform the following.
• Tape the piping, drain hose and connecting cable from
down to up.
• Secure the tapped piping along the exterior wall using sad-
dle or equivalent.
To check the drainage.
• Pour a glass of water on the evaporator.
• Ensure the water flows through the drain hose of the indoor
unit without any leakage and goes out the drain exit.
In cases where the Outdoor unit is installed
above the Indoor unit perform the following.
above the Indoor unit perform the following.
• Tape the piping and connecting cable from down to up.
• Secure the taped piping along the exterior wall. Form a trap
to prevent water entering the room.
• Fix the piping onto the wall by saddle or equivalent.
Drain piping
• The drain hose should point downward for easy drain flow.
• Do not make drain piping.
Pull the right and
the left side.
the left side.
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
Taping
Drain
hose
hose
Pipings
Connecting
cable
cable
Trap is required to prevent water
from entering into electrical parts.
from entering into 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
Air purgingd
Air and moisture remaining in the refrigerant system have
undesirable effects as indicated below.
undesirable effects as indicated below.
• Pressure in the system rises.
• Operating current rises.
• Cooling(or heating) efficiency drops.
• Moisture in the refrigerant circuit may freeze and block cap-
illary tubing.
• Water may lead to corrosion of parts in the refrigeration
system.
Therefore, the indoor unit and tubing between the indoor and
outdoor unit must be leak tested and evacuated to remove
any noncondensables and moisture from the system.
outdoor unit must be leak tested and evacuated to remove
any noncondensables and moisture from the system.
• Do a leak test of all joints of the tubing(both indoor and out-
door) and both gas and liquid side service valves.
Bubbles indicate a leak. Be sure to wipe off the soap with a
clean cloth.
Bubbles indicate a leak. Be sure to wipe off the soap with a
clean cloth.
• 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.
at the nitrogen cylinder. When the system pressure is
reduced to normal, disconnect the hose from the cylinder.
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 complet-
ed. Remove the service valve caps from both the gas and
the liquid side on the outdoor unit. Note that both the liquid
and the gas side service valves on the outdoor unit are
kept closed at this stage.
connected and all wiring for the test run has been complet-
ed. Remove the service valve caps from both the gas and
the liquid side on the outdoor unit. Note that both the liquid
and the gas side service valves on the outdoor unit are
kept closed at this stage.
Leak test
• Connect the manifold valve(with pressure gauges) and dry
nitrogen gas cylinder to this service port with charge hoses.
• 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.
gauge reading reached 150 P.S.I.G. Next, test for leaks
with liquid soap.
AIR PURGING
Air purging
Air purging with vacuum pump
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.
available, use a stop valve for this purpose. The "Hi" knob
of the manifold valve must always be kept close.
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 vertical standing position.
state, the top of the cylinder must be higher than its bottom
when you pressurize the system. Usually, the cylinder is
used in a vertical standing position.
Lo
Hi
Indoor unit
Outdoor unit
Manifold valve
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
cylinder(in vertical
standing position)
Pressure
gauge
gauge
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