Panasonic Cs C9dkzw Cu 2c18dkh Cu 3c20dkh Repair Manual

 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 × 1.5 mm
2
flexible cord, typedesignation 245 IEC 57 or heavier cord.
 • Ensure the color 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 forthe electrical safetyin case of
the...

HOW TO TAKE OUT FRONT GRILLE
Please follow the steps below to take out front grille if
necessary such as when servicing.
 1. Open the intake grille and remove the screw at the front of
the front grille.
 2. Set the vertical airflow direction louver to the horizontal
position.
 3. Slide down the 2 caps on the front grille as shown in the
illustration below, and then remove the 2 mounting screws.
 4. Pull the lower section of the front grille towards you to
remove the front grille.
When reinstalling the...

10.6. Outdoor unit
10.6.2. INSTALL THE OUTDOOR UNIT
 • After selecting the best location, start installation according
to Indoor/Outdoor Unit Installation Diagram.
 1. Fix the unit on concreteor rigid frame firmly and horizontally
by bolt nut. (ø10 mm).
 2. When installing at roof, please consider strong wind and
earthquake. Please fasten theinstallation standfirmly with
bolt or nails.
10.6.3. CONNECTING THE PIPING
Connecting The Piping To Indoor Unit
Please make flare after inserting flare nut (locate...

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.
10.6.4. AIR PURGING OF THE PIPING AND INDOOR UNIT
1) Checking gas leakage
 1. Remove the service-portcap from both3-wayvalves.
 2. Connect the manifold gauge set tothe service port...

The air which contains remaining moisture in the refrigeration
cycle may cause a malfunction on the compressor.
 1. To purge the air, push the pin on the gas side 3-way valve
for three seconds using with a hexagonal wrench and set it
free for one minute.
 • Repeat this three times.
 2. To balance the refrigerant, close the low pressure side
valve on the manifold gauge and release a refrigerant from
the piping through service port until the gauge indicates
0.49 ~ 0.294 MPa.
 3. Set theboth 3-wayvalves to...

10.6.6. PIPE INSULATION
CHECK THEDRAINAGE
 • Open front panel and remove air filters.
(Drainage checking can be carriedout without removing the
front grille.)
 • Pour a glass of water into the drain tray-styrofoam.
 • Ensure that water flows out from drain hose of the indoor
unit.
EVALUATION OF THEPERFORMANCE
 • Operate the unit at cooling operation mode for fifteen
minutes or more.
 • Measure the temperature of the intake and discharge air.
 • Ensure the difference between the intake temperature and
the...

11 3-way Valve
3-way Valve (Liquid Side)3-way Valve (Gas Side)
WorksShaft PositionService PortShaft PositionService Port
ShippingClosedClosedClosedClosed
(With valve cap)(With cap)(With valve cap)(With cap)
Air purgingClosedOpenClosedOpen
(Installation and(Clockwise)(Connected manifo ld(Clockwise)(Push-pin)
Re-installation)gauge w/charging cylinder)
OperationOpenClosedOpenClosed
(With valve cap)(With cap)(With valve cap)(With cap)
Pumping downClosedClosedOpenOpen
(Transferring)(Clockwise)(With...

11.1. Air purging
Required tools: Hexagonal wrench, adjustable wrench,
torque wrenches, wrench to hold the
joints, gas leak detector, and charging
set.
 1. Recheck the piping connections.
 2. Open thevalve of the lowpressure side of Manifold
gauge counter-clockwise for 10 seconds, and then
close it.
 3. Check for gas leakage.
 • Check the flare connections for gas leakage.
 4. Purge the air from the system.
 • Open the Low pressure side valve of the manifold
gauge.
 • Press the valve core pin with the...

11.2. Pumping down
 1. Confirm that both the 3-wayvalves are setto the open
position.
 • Remove the valve stem caps and confirm that the valve
stems are in the raised position.
 • Be sure to use a hexagonal wrench to operate the valve
stems.
 2. Operate the unit for 10 to 15 minutes.
 3. Stop operation and wait for 3 minutes, then connect the
charge set to the serviceport of the3-wayvalves.
 • Connect the charge hose with the push pin to the gas
side service port.
 4. Air purging of the charge hose.
 •...

(Re-installation)
 1. Remove the capnut from3-wayvalves.
 • Remove the cap nutfrom 3-wayvalves after carefully
checked whether the piping connection was properly
and certainly done.
 2. Confirm that thevalve inboth3-wayvalves are set to
the CLOSED position.
 3. Connect the gas cylinder to the liquid-side (high-
pressure) 3-wayvalve andthe charge set to the gas
side (low-pressure) 3-wayvalve.
 • Remove the flare nut from the service port to connect
the charge set and gas cylinder.
 • Close the valves on...