Panasonic Cs C9gkzw Cs C12gkzw Cu C9gkzw Cu C12gkzw Repair Manual

							21
11.2. Indoor Unit
11.2.1. 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
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 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.
11.2.2. 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
compound at the final stage.
11.2.3. 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 15 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. 
						

							22 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.) 
						

							23 • 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.
11.2.4. 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 4 × 1.5mm
2
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).
11.3. Outdoor Unit
11.3.1. 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
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.
11.3.2. 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
torque as stated in the table.
Model A B C D
CU-C9GKZ 474 87 18.5 261
CU-C12GKZ 570 105 18.5 320 
						

							24 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 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.
11.3.3. 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).
Model Piping size (Torque)
Gas Liquid
CU-C9GKZ 3/8” [42 N•m] 1/4” [18 N•m]
CU-C12GKZ 1/2” [55 N•m] 1/4” [18 N•m] 
						

							25 4(A). Checking gas leakage for the left piping
11.3.4. 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 4 × 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. Cable connection to the power supply (220-240V, 50Hz)
through knife switch (Disconnecting means).
• Connect the approved polychloroprene sheathed power
supply cable (1.5 mm
2), type designation 245 IEC 57 or
heavier cord to the terminal board, and connect the other
end of the cable to knife switch (Disconnecting means).Note: Knife switch (Disconnecting means) should 
have more than 3.5 mm contact gap.
• Secure the cable onto the control board with the holder
(clamper).
11.3.5. 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. 
						

							26
12 Operation and Control
12.1. 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.
12.1.1. Cooling Operation Time Diagram 
						

							27
12.2. 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.
12.2.1. Soft Dry Operation Time Diagram 
						

							28
12.3. Automatic Operation
• Automatic operation can be set using remote control.
• This operation starts to operate with indoor fan at SLo speed for 20 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.
• 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.
• The operation mode judging temperature and standard setting temperature can be increased by 2°C permanently, by open the
circuit of JX1 at indoor electronic controller. 
						

							29
12.4. Operation Control
12.4.1. Restart Control (Time Delay Safety Control)
•When the thermo-off temperature (temperature which compressor stops to operate) is reached during:-
- Cooling operation - the compressor stops for 3 minutes (minimum) before resume operation.
- Soft Dry operation - the compressor stops for 6 minutes (minimum) before resume operation.
• If the operation is stopped by the remote control, the compressor will not turn on within 3 minutes from the moment operation
stop, although the unit is turn on again within the period.
•This phenomenon is to balance the pressure inside the refrigerant cycle.
12.4.2. 7 Minutes Time Save Control
•The compressor will start automatically if it has stopped for 7 minutes and the intake air temperature falls between the
compressor ON temperature (A) and compressor OFF temperature (B) during the period.
• This phenomenon is to reduce the built up humidity inside a room.
12.4.3. 60 Seconds Forced Operation
•Once the air conditioner is turned on, the compressor will not stop within 60 seconds in a normal operation although the intake air
temperature has reached the thermo-off temperature. However, force stop by pressing the OFF/ON operation button at the
remote control is permitted.
•The reason for the compressor to force operate at minimum 60 seconds is to allow the refrigerant oil run in a full cycle and return
back to the outdoor unit.
12.4.4. Starting current Control
•When the compressor, outdoor fan motor and indoor fan motor are simultaneously started, the indoor fan motor will start to
operate at 1.6 second later.
•The reason of the difference is to reduce the starting current flow. 
						

							30
12.4.5. Freeze Preventive Control
• To protect indoor heat exchanger from freezing and to prevent higher volume of refrigerant in liquid form return to compressor.
• This control will activate when the temperature of indoor heat exchanger falls below 2°C continuously for more than 4 minutes.
• The current fan speed will change to freeze prevention speed after 70 seconds compressor on. When indoor pipe temperature
reaches certain temperature for 5 sec. the speed will be increased as in below figure.
• Compressor will turn off when indoor temperature falls below 2°C for more than 4 minutes. It will restart again when indoor heat
exchanger temperature rises to 10°C.
• Restart control (Time Delay Safety Control) will be applied in this control.
12.4.6. Compressor Reverse Rotation Protection Control
• If the compressor is operating continuously for 5 minutes or longer and the temperature difference between intake air and indoor
heat exchanger is 2.5°C or less for continuous 2 minutes, compressor will stop and restart automatically.
• Time Delay Safety Control is activated before the compressor restart.
•This is to prevent compressor from rotate reversely when there is an instantaneous power failure.