Panasonic Cs A18ekh Cs A24ekh Cu A18ekh Cu A24ekh Repair Manual

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10 Installation Instruction
INDOOR UNIT
• There should not be any heat source or steam near the unit.
• There should not be any obstacles blocking the air
circulation.
• A place where air circulation in the room is good.
• A place where drainage can be easily done.
• A place where noise prevention is taken into consideration.
• Do not install the unit near the door way.
• Ensure the spaces indicated by arrows from the wall, ceiling,
fence or other obstacles.
• Recommended installation height for indoor unit shall be at
least 2.5 m.
OUTDOOR UNIT
• If an awning is built over the unit to prevent direct sunlight or
rain, be careful that heat radiation from the condenser is not
obstructed.
• There should not be any animal or plant which could be
affected by hot air discharged.
• Keep the spaces indicated by arrows from wall, ceiling,
fence or other obstacles.
• Do not place any obstacles which may cause a short circuit
of the discharged air.
• If piping length is over 7.5m, additional refrigerant should be
added as shown in the table.
Example: For A24EK
If the unit is installed at a 10m distance, the quantity of 
additional refrigerant should be 75g....(10 - 7.5)m x 30g/m =75gIndoor/Outdoor Unit Installation Diagram
SELECT THE BEST LOCATION
ModelPiping size Rate
Length 
(m)
Max. 
Elevation 
(m)Max. Piping 
Length (m)Additional 
Refrigeration 
(g/m)
Gas Liquid
C18EK, 
RS-C18EK1/2” 1/4” 5 20 25 20
C24EK, 
RS-C24EK5/8” 1/4” 5 20 25 30
A18EK 1/2” 1/4” 5 20 25 20
A24EK 5/8” 1/4” 5 20 25 30 
						

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10.1. Indoor Unit
10.1.1. HOW TO FIX INSTALLATION PLATE
The mounting wall is strong and solid enough to prevent it from
the vibration.
The centre of installation plate should be at more than 550 mm
at right and left of the wall.
The distance from installation plate edge to ceiling should more
than 67 mm.
From installation plate left edge to unit’s left side is 47 mm.
From installation plate right edge to unit’s right is 73 mm.
B: For left side piping, piping connection for liquid should
be about 126 mm from this line.
: For left side piping, piping connection about 174 mm 
from this line.
: For left side piping, piping connection about 984 mm 
from this line.
1. Mount the installation plate on the wall with 5 screws or
more.
(If mounting the unit on the concrete wall, consider using
anchor bolts.)
• Always mount the installation plate horizontally by
aligning the marking-off line with the thread and using a
level gauge
2. Drill the piping plate hole with ø70 mm hole-core drill.
• Line according to the arrows marked on the lower left
and right side of the installation plate. The meeting point
of the extended line is the centre of the hole. Another
method is by putting measuring tape at position as
shown in the diagram above. The hole centre is obtained
by measuring the distance namely 150 mm and 125 mm
for left and right hole respectively.
• Drill the piping hole at either the right or the left and the
hole should be slightly slanted to the outdoor side.
10.1.2. TO DRILL A HOLE IN THE WALL
AND INSTALL A SLEEVE OF
PIPING
1. Insert the piping sleeve to the hole.
2. Fix the bushing to the sleeve.
3. Cut the sleeve until it extrudes about 15 mm from the
wall.
4. Finish by sealing the sleeve with putty or caulking
compound at the final stage.
10.1.3. INDOOR UNIT INSTALLATION
1.For the right rear piping
2.For the right and right bottom piping
CautionWhen the wall is hollow, please be sure to use the sleeve 
for tube ass’y to prevent dangers caused by mice biting 
the connecting cable. 
						

							23 3.For the embedded piping
(This can be used for left rear piping and left bottom piping also.) 
						

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10.1.4. CONNECT THE CABLE TO THE INDOOR UNIT
1. The inside and outside connecting cable can be
connected without removing the front grille.
2. Connecting cable between indoor unit and outdoor unit
shall be approved polychloroprene sheathed 3 × 2.5 mm
2
(C18EK, C24EK, RS/RU-C18/24EK) or 5 × 2.5 mm2
(A18EK, A24EK) flexible cord, type designation 245 IEC
57 or heavier cord.
• Ensure the colour of wires of outdoor unit and the
terminal Nos. are the same to the indoor’s respectively.
• Earth lead wire shall be longer than the other lead wires
as shown in the figure for the electrical safety in case of
the slipping out of the cord from the anchorage.
• Secure the cable onto the control board with the holder
(clamper). 
						

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10.2. Outdoor Unit
10.2.1. INSTALL THE OUTDOOR UNIT
• After selecting the best location, start installation according
to Indoor/Outdoor Unit Installation Diagram.
1. Fix the unit on concrete or rigid frame firmly and
horizontally by bolt nut (ø10 mm).
2. When installing at roof, please consider strong wind and
earthquake. Please fasten the installation stand firmly
with bolt or nails.
10.2.2. CONNECTING THE PIPING
Connecting The Piping To Indoor Unit
Please make flare after inserting flare nut (locate at joint portion
of tube assembly) onto the copper pipe. 
(In case of using long piping)
Connect the piping
• Align the center of piping and sufficiently tighten the flare nut
with fingers.
• Further tighten the flare nut with torque wrench in specified
torque as stated in the table.
Connect The Piping to Outdoor Unit
Decide piping length and then cut by using pipe cutter. Remove burrs from cut edge. Make flare after inserting the flare nut (located
at valve) onto the copper pipe.
Align center of piping to valves and then tighten with torque wrench to the specified torque as stated in the table.
Cutting and Flaring the Piping
1. Please cut using pipe cutter and then remove the burrs.
2. Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused. Turn the piping end down to avoid
the metal powder entering the pipe.
3. Please make flare after inserting the flare nut onto the copper pipes.
10.2.3. AIR PURGING OF THE PIPINGS AND INDOOR UNIT
1) Checking a gas leakage
1. Remove the service-port cap from both 3-way valves.
2. Connect the Manifold gauge set to the service port of
Liquid side 3-way valve.
3. Connect the Charging Cylinder to the Manifold gauge set
and open the valve of the Cylinder.
4. Open the low pressure side valve of the Manifold gauge
for approx. 10 seconds and then close.
5. Check gas-leakage of the connecting portion of pipings
with the gas-leak detector.
MODEL Piping size (Torque)
Gas Liquid
C18EK, A18EK, RS-C18EK 1/2” (55 N•m) 1/4” (18 N•m)
C24EK, A24EK, RS-C24EK 5/8” (65 N•m) 1/4” (18 N•m) 
						

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1) Measure the pressure.
2) Keep it for 5-10 minutes
•Ensure if the pressure indicated on the gauge is as same as that of measured at first time.
2) Air purging
The air remaining in the Refrigeration cycle which contains
moisture may cause malfunction on the Compressor.
1. To purge the air, push the pin on the Gas side 3-way
valve for three seconds with a Hexagonal wrench and set
it free for one minute.
• Repeat this for three times.
2. To balance the refrigerant, close the low pressure side
valve on the Manifold gauge and release refrigerant from
the piping through service port until the gauge indicates
0.5 - 0.3 MPa.
3. Set both 3-way valves to open position with the
Hexagonal wrench for the unit operation.
10.2.4. CONNECT THE CABLE TO THE OUTDOOR UNIT
1. Remove the control board cover from the unit by loosening the screw.
2. Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 3 × 2.5 mm
2 (C18EK,
C24EK, RS/RU-C18/24EK) or 5 × 2.5 mm
2 (A18EK, A24EK) flexible cord, type designation 245 IEC 57 or heavier cord.
3. Secure the cable onto the control board with the holder (clamper).
4. Attach the control board cover to the original position with the screw. 
						

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11 Operation and Control
11.1. Heating Operation
• Heating operation can be set using remote control.
• This operation is applied to warm the room temperature reaches the setting temperature set on the remote control.
• The remote control setting temperature, which takes the reading of intake air temperature sensor, can be adjusted from 16°C to
30°C.
• During heating operation, the compressor will stop running and restart as shown in below figure.
11.1.1. Heating Operation Time Diagram 
						

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11.2. Cooling Operation
• Cooling operation can be set using remote control.
• This operation is applied to cool down the room temperature reaches the setting temperature set on the remote control.
• The remote control setting temperature, which takes the reading of intake air temperature sensor, can be adjusted from 16°C to
30°C.
• During cooling operation, the compressor will stop running and restart as shown in below figure.
11.2.1. Cooling Operation Time Diagram 
						

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11.3. Soft Dry Operation
• Soft Dry operation can be set using remote control.
• Soft Dry operation is applied to dehumidify and to perform a gentle cooling to the room.
• This operation starts when the intake air temperature sensor reaches the setting temperature on the remote control.
• When operation begins, Soft Dry will be switched “ON” for a maximum 10 minutes, then Soft Dry operation will be turned “OFF”
for a minimum 6 minutes. After that, the Soft Dry operation will be “ON” and “OFF” based on the setting temperature as shown in
below figure.
• However after 3 minutes of compressor off, during Soft Dry “OFF” (within 6 minutes Soft Dry restart control), the indoor unit will
start to operate at normal Cooling mode if the intake temperature is higher than Cooling “ON” point.
11.3.1. Soft Dry Operation Time Diagram 
						

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11.4. Automatic Operation
• Automatic operation can be set using remote control.
• This operation starts to operate with indoor fan at SLo speed for 25 seconds to judge the intake air temperature.
• After judged the temperature, the operation mode is determined by referring to the below standard.
• Then, the unit start to operate at determined operation mode, until it is switched off using remote control, with the setting
temperature as shown in below table.
• Operation mode will be determine again for judgement after 1 hour of operation, if the room temperature reaches to set
temperature and compressor off time is over 7 minutes 30 seconds continuously.
*The present operation mode will be continued, if the room temperature does not reach to set temperature (Compressor keeps
running) eventhough after 1 hour from automatic operation mode started.
• Automatic Set Temperature
For each operation, set temperature will automatically set as shown below.
• The setting temperature for all the operations can be changed one level up or one level down from the standard temperature as
shown in below table by pressing on the temperature up or temperature down button at remote control.
Standard for Determining Operation Mode
2nd Judgement onwards
Present
ModeJudgementNext Mode
Cooling Soft Dry Heating
CoolingO
(Judgement:
23°C & Above)Not ApplicableO
(Judgement:
Below 23°C) 23°CCooling
Heating
Soft Dry Not ApplicableO
(Judgement:
20°C & Above)O
(Judgement:
Below 20°C) 20°CSoft Dry
Heating
HeatingO
(Judgement:
25°C & Above)Not ApplicableO
(Judgement:
Below 25°C) 25°CCooling
Heating
OperationHi (Standard) Lo
(+2°C) (±0°C) (-2°C)
Cooling 27°C25°C23°C
Soft Dry 24°C22°C20°C
Heating 23°C21°C19°C