Panasonic Cw Xc70ja Cw Xc90ja Repair Manual

							 1 Functions 2
 2 Product Specifications 
4
 3 Dimensions 
5
 4 Refrigeration Cycle Diagram 
6
 5 Block Diagram 
6
 6 Wiring Diagram 
7
 7 Air Conditioner Performance Evaluation 
7
 8 Troubleshooting Guide 
8
 9 Operation Details 
10
 10  Operating Instructions 
13
© 2002 Matsushita Industrial Corp. Sdn. Bhd.
(11969-T). All rights reserved. Unauthorized copying
and distribution is a violation of law.
CW-XC70JA
CW-XC90JA
 11  Installation Instructions 18
 12  Care and Maintenance 
21
 13  Servicing Information 
22
 14  Technical Data 
24
 15  Electronic Circuit / Main 
25
 16  Electronic Circuit / Indicator Complete 
25
 17  Electronic Circuit Diagram 
26
 18  Exploded View 
29
 19  Replacement Part List 
30
Room Air Conditioner
CONTENTS
 Page  Page
Order No. MAC0210054C3 
						

							1 Functions
1.1. Remote Control
2 
						

							1.2. Main Unit
3 
						

							2 Product Specifications
UnitCW-XC70JACW-XC90JA
PhaseØSingleSingle
VoltageV220220
FrequencyHz5050
Cooling CapacitykW
Btu/h2.06
7,0002.64
9,000
Running CurrentA3.84.4
Input PowerW730935
EERBtu/hW9.69.6
Starting CurrentA15.215.5
Compressor OutputW550750
Fan Motor OutputW5151
Noise LevelIndoor
(High / Low)db(A)46 / 3746 / 39
Outdoor
(High / Low)db(A)55 / 5056 / 53
Moisture RemovalL/h
Pt/h1.3
2.71.6
3.4
Air CirculationIndoorm3/min (ft3/min)7.3 (258)7.3 (258)
Outdoorm3/min (ft3/min)11.3 (399)11.3 (399)
DimensionsHeightmm
inches346
(13-5/8)346
(13-5/8)
Widthmm
inches450
(17-23/32)450
(17-23/32)
Depthmm
inches580
(22-27/32)580
(22-27/32)
Net Weightkg
lb28
6229
64
Gross Weightkg
lb30
6631
68
Refrigerant (R-22)g
oz480
16.9490
17.3
 • Specifications are subject to changewithout notice for further improvement.
4 
						

							3 Dimensions
3.1. Top View, Front View and Side View
3.2. Unit
ItemUnit: Inch (mm)
A - Width17-23/32” (450)
B - Height13-10/16” (346)
C - Depth22-27/32” (580)
D11-9/16” (293)
E1-15/32” (37)
F10-14/16” (276)
G11-9/16” (293)
5 
						

							4 Refrigeration Cycle Diagram
ModelCW-XC70JACW-XC90JA
ItemPressure (MPa)Temperature (°C)Pressure (MPa)Temperature (°C)
A1.84 ~ 2.0461 ~ 761.95 ~ 2.1568 ~ 83
B1.68 ~ 1.8835 ~ 451.79 ~ 1.9935 ~ 45
C0.60 ~ 0.669~150.54 ~ 0.607~13
D0.57 ~ 0.6310 ~ 180.51 ~ 0.578~16
Note: Indoor temperature at 27°C (DB), 19°C(WB) and Outdoor at 35°C (DB),24°C (WB)forCooling.
5 Block Diagram
6 
						

							6 Wiring Diagram
6.1. Resistance of Fan Motor
windings and the rated
Capacitor
ModelCW-XC70JA & CW-XC90JA
ConnectionCWA921154
Blue - Yellow98.1Ω
Yellow - Orange18.5Ω
Brown - Yellow97.4Ω
Red - Yellow125.8Ω
6.2. Resistance of Compressor
windings and the rated
Capacitor
ModelCW-XC70JACW-XC90JA
ConnectionCWB09759CWB09758
C-R5.193Ω3.501Ω
C-S5.557Ω3.405Ω
CapacitorCWA312074
(20µF, 370VAC)CWA312076
(30µF, 370VAC)
Note: Resistance at 20°C of Ambient Temperature.
7 Air Conditioner Performance Evaluation
Suction & Discharge Air
Temperature DifferenceCurrentDeterminationRemedy
 • 8°C and over (14.4°F) • As specified. • Nothing wrong. • None.
 • 8°C and over (14.4°F) • Higher than specified. • Nothing wrong, outdoor
temperature is too high, heat
radiation is not efficient. • Improve heat radiation.
 • Under 8°C (14.4°F) • Higher than specified. • Something is preventing heat
radiation. • Excessive amount of refrigerant.
 • Improve heat radiation.
 • Under 8°C (14.4°F) • Lower than specified. • Leakage of refrigerant or
refrigerant system is blocked. • Locate and repair leak.
 • Flush refrigeration cycle.
 • Under 8°C (14.4°F) • Higher than specified by
50%. • Compressor defect. • Replace the compressor.
Note: Room air humidity is relatively higher, the temperature difference will be smaller.
7 
						

							8 Troubleshooting Guide
Warning: Disconnect unit from electrical power supply before making any electrical checks.
TroubleCheckResultCausesRemedy
Fan Motor and Compressor
won’t run. • Supply Voltage
 • Fuse Box or Circuit
Breaker.
 • Power cord or Wiring
Harness.
 • Temperature Setting. • Less than 10% by
Rated.
 • Open Contacts.
 • Pulled loose or Shorted.
 • Higher than room
temperature • Temporary or
Permanent?
 • Customer Restarted
unit immediately without
waiting 3 minutes. • Consult ELECTRICIAN,
if permanent.
 • W AIT FOR 3
MINUTES.
 • Repair Open Circuit.
 • Repair or Replace it.
 • Set it LOWER.
Fan motor won’t run
(Compressor run). • Objects around Fan.
 • RESISTANCE between
Wires.
 • Capacitor Fan Motor. • Locked Fan.
 • Shorted / Open circuit.
 • OHM Meter doesn’t
Deflect. • Fan Hitting Cowling.
 • Foreign Materials.
 • Frozen Bearings.
 • Shorted or Burned out.
 • Capacitor Defect. • Adjust Fan position
setting screw.
 • Remove Foreign
Materials.
 • Replace Fan Motor.
 • Replace Fan Motor.
 • Replace Capacitor Fan.
Compressor won’t run (Fan
run). • Temperature setting.
 • RESISTANCE between
Terminal and the
Compressor Body.
 • RESISTANCE between
Terminals.
 • Overload Protector.
 • Capacitor Compressor.
 • Thermostat. • Higher than room temp.
 • Shorted.
 • Shorted.
 • Infinity between
Terminals.
 • OHM Meter doesn’t
deflect.
 • No click heard. • W inding Coil touched to
the compressor shell.
 • Rear Shorted or Burnt
out.
 • Rear Shorted or Burnt
out.
 • Overload Protector
defect.
 • Capacitor defect.
 • Thermostat defect. • Set it lower.
 • Replace Compressor.
 • Replace Compressor.
 • Replace Overload
Protector.
 • Replace Capacitor
Compressor.
 • Replace Thermostat.
Air Swing won’t run • Air Swing Switch. • OFF position. • Set it ON.
 • No contact at position. • Open circuit • Replace Air Swing
Switch.
 • Resistance between
wires. • OHM Meter doesn’t
deflect. • Shorted or open circuit. • Replace Air Swing
Motor.
8 
						

							TroubleCheckResultCausesRemedy
Insufficient cooling. • Temperature Setting.
 • Ventilation door open.
 • Air filter dirty.
 • Location of installation.
 • Evaporator/Conden ser
Coil obstructed.
 • Unit capacity for the
room too small.
 • Temperature difference
and running current. • Higher than room
temperature.
 • Open.
 • Clogged or dirty.
 • Sunlight hitting outdoor
side.
 • Obstacles.
 • Clogged or dirty.
 • Not satisfied.
 • REFER TO
PERFORMANCE
EVALUATION. • Reduces capacity.
 • Restricted air
circulation.
 • Restricted Heat
Exchanger.
 • Restricted Heat
Exchanger.
 • Restricted air
circulation.
 • Leakage of refrigerant
or refrigeration system
is blocked. • Set it lower.
 • Close ventilation door.
 • Clean or replace Air
Filter.
 • Consider building an
AWNING.
 • Remove obstacles or
reinstall unit.
 • Clean the coils.
 • Replace the unit with
bigger one.
 • Locate repair leak.
 • Flush refrigeration
cycle.
Noise • Source of Noise • Vibration.
 • Intermittent Noise. • Faulty installation.
 • Fan hitting objects.
 • Refrigerant tubing
touching each other.
 • Fan splashing Drain
Water. • Reinstall unit or
Reinforce the
installation.
 • Adjust Fan position or
remove foreign
materials.
 • About 1/2” Clearance
needed.
 • Remove drain plug and
mount a drain pan to
remove the water.
 • Set the Drain outlet
downward, so that the
Drain water can run off.
Waterdripping inside room. • Unit installation.
 • Drain Tray-Styrofoam
pieces blocking drain
channel. • Tilted to inside room.
 • Clogged. • Restricted run off.
 • Clogged or blocked. • Tilt unit to outside
slightly.
 • Remove the foreign
materials.
Frozen Evaporator • Temperature setting.
 • Air Filter/Evaporator.
 • Temperature difference
and running current. • Set too low for ambient
conditions.
 • Clogged or Dirty.
 • REFER TO
PERFORMANCE
EVALUATION • Outdoor temperature
low (Night time).
 • Restricted air
circulation.
 • Leakage of refrigerant
or refrigeration system
is blocked. • Set the Main Control
knob to Fan to melt ice
and set the
Temperature Control to
higher temperature.
 • Clean Air
filter/Evaporator.
 • Locate and repair leak.
 • Flush refrigeration
cycle.
9 
						

							9 Operation Details
9.1. Fan Mode Operation
 • Fan operation only. Fan inoperation according to Remote Control or Main Unit (Touch Control Panel) setting.
9.1.1. Manual Setting of Fan Speed
 • Basic Fan Speed can be manually adjusted (Lo or Hi) byusing the Fan Speed Selection Button/Pad at Remote Control or Main
Unit (Touch Control Panel).
9.2. Cooling Mode Operation
 • Cooling in operation according to Remote Control or Main Unit (Touch Control Panel) setting.
9.2.1. Time Delay Safety Control (3 minute)
 • When the compressor is stopped by Operation Switch at the Remote Control or Main Unit (Touch Control Panel), it restart after
3 minutes when the Operation Switch at the Remote Control or Main Unit (Touch Control Panel) is turned ON.
 • When the setting temperature is reached during cooling operation, the compressor stops and it will not start for 3 minutes.
 • Protection of compressor to balance the pressure in the refrigeration cycle for 3 minutes.
9.2.2. 7 minutes Time Saved Control
 • The compressor will start automatically if it has stopped for 7 minutes even if the room temperature is between the compressor
ON temperature and OFF temperature.
9.2.3. Starting Current Control
 • When the compressor and fan motor are simultaneously started, the fan motor will operate 1.6 seconds later.
9.2.4. Freeze Prevention Control
If the temperature of the indoor heat exchanger falls
continuously below 10°C for 3 minutes or more, the
compressor turns off to protect the heat exchanger from
freezing. The fan speed setting remains the same.
Compressor restarts when the heat exchanger temperature
rises to 12°C (Recovery).
*3 minutes waiting of Time DelaySafety Control isvalid for
Cooling Operation.
9.2.5. Compressor Reverse Rotation Protection Control
 • If the compressor is operating continuously for 5 minutes or longer and the temperature difference between intake air and heat
exchanger is 2.5°C or less for 2 minutes,compressor will stop and restart automatically (Time DelaySafety Controlis valid).
10