Panasonic Cs A9ekh Cu A9ekh Cs A12ekh Cu A12ekh Repair Manual

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10 Installation Instruction
10.1. Select The Best Location
• There should not be any heat source or steam near the unit.
• There should not be any obstacles blocking the air circula-
tion.
• 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.
• 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 the rated length, additional refrigerant
should be added as shown in the table.
• This illustration is for explanation purposes only.
The indoor unit will actually face a different way.
Indoor Unit
Outdoor Unit
Piping size Rated
Length
(m)Max
Elevation
(m)Max.
Piping
Length
(m)Additional
Refrigerant
(g/m) Model Gas Liquid
C7EK/
C9EK3/8” 1/4” 7.5 5 10 10
A9EK 3/8” 1/4” 7.5 5 10 20
RS-C7EK/
C9EK3/8” 1/4” 7.5 5 10 10
C12EK 1/2” 1/4” 7.5 5 15 10
A12EK 1/2” 1/4” 7.5 5 15 20
RS-
C12EK1/2” 1/4” 7.5 5 15 10Indoor/Outdoor Unit Installation Diagram 
						

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10.2. Indoor Unit
10.2.1. 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 450 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 units left side is 74 mm.
From installation plate right edge to units right is 94 mm.
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 align-
ing 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 left and right side edge of the instal-
lation plate. The meeting point of the extended line is the
centre of the hole. Another method is by putting measur-
ing 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.
10.2.2. 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 com-
pound at the final stage.
10.2.3. Indoor Unit Installation
For the right rear piping
For the right and right bottom piping
:
:
:For left side piping, piping connection for liquid should be
about 5 mm from this line.
For left side piping, piping connection for gas should be
about 45 mm from this line.
For left side piping, piping connection cable should be
about 800 mm from this line.
Caution
When 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 For the embedded piping
Pull out the piping and drain hose
How to keep the coverInsert the connecting cable
Install the Indoor unit
Secure the Indoor Unit
(This can be used for left rear piping & left bottom piping 
also.) 
						

							24 • How to pull the piping and drain hose out, in case of the
embedded piping.
• In case of left piping how to insert the connecting cable and
drain hose.
10.2.4. Connect The Cable To The Indoor
Unit
1. The inside and outside connecting cable can be con-
nected without removing the front grille.
2. Connecting cable between indoor unit and outdoor unit
shall be approved polychloroprene sheathed 3 (C7EK,
C9EK, C12EK, RS-C7EK, RS-C9EK, RS-C12EK) or 5
(A9EK, A12EK) × 1.5mm
2 flexible cord, type designation
245 IEC 57 or heavier cord.
• Ensure the colour of wires of outdoor unit and the termi-
nal 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).
10.3. Outdoor Unit
10.3.1. 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 horizon-
tally 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.
10.3.2. 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
Model A B C D
C7EK, C9EK, A9EK 474 87 18.5 261
C12EK, A12EK, 
RS-C12EK570 105 18.5 320 
						

							25 torque as stated in the table.
Connecting 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
(locate at valve) onto the copper pipe. Align center of piping tovalves 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.
10.3.3. Air Purging Of The Pipings And Indoor Unit
The remaining air in the Refrigeration cycle which contains moisture may cause malfunction on the compressor.
1. Remove the caps from the 2-way and 3-way valves.
2. Remove the service-port cap from the 3-way valves.
3. To open the valve, turn the valve stem of 2-way valve counter-clockwise approx. 90° and hold it there for ten seconds, then
close it.
4. Check gas-leakage of the connecting portion of the pipings.
* For the left pipings, refer to item 4(A).
5. To open 2-way valve again, turn the valve stem counter-clockwise until it stops.
Model Piping size (Torque)
Gas Liquid
C7EK, C9EK, C12EK
RS-C7EK, RS-C9EK3/8” [42 N•m] 1/4” [18 N•m]
C12EK, A12EK, 
RS-C12EK1/2” [55 N•m] 1/4” [18 N•m] 
						

							26 4(A). Checking gas leakage for the left piping
10.3.4. Connect The Cable To The Outdoor
Unit
1. Remove the control board cover from the unit by loosen-
ing the screw.
2. Connecting cable between indoor unit and outdoor unit
shall be approved polychloroprene sheathed 3 (C7EK,
C9EK, C12EK, RS-C7EK, RS-C9EK, RS-C12EK) or 5
(A9EK, A12EK) × 1.5 mm
2 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 back to the original posi-
tion with the screw.
10.3.5. Pipe Insulation
1. Please carry out insulation at pipe connection portion as
mentioned in Indoor/Outdoor Unit Installation Diagram.
Please wrap the insulated piping end to prevent water
from going inside the piping.
2. If drain hose or connecting piping is in the room (where
dew may form), please increase the insulation by using
POLY-E FOAM with thickness 6mm or above.
(1) * Connect the manifold gauge to the service port of 3-way valve.
* Measure the pressure.
(2) * Keep it for 5-10 minutes.
* Ensure that the pressure indicated on the gauge is the same as
that of measured during the first time. 
						

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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 temper-
ature 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 temper-
ature 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.
Present Judgement Next Mode
Mode Cooling Soft Dry Heating
OO
Cooling 23°C Cooling (Judgement Not Applicable (Judgement
Heating 23°C & Above) Below 23°C)
OO
Soft Dry 20°C Soft Dry Not Applicable (Judgement (Judgement
Heating 20°C & Above) Below 20°C)
OO
Heating 25°C Cooling (Judgement Not Applicable (Judgement
Heating Above 25°C) 25°C & Below)
Automatic Set Temperature
Refer as below.