Panasonic CW-A91AE / CW-A121AE Service Manual ▷ View online
Trouble
Check
Result
Cause
Remedy
Compressor won’t run
(Fan run).
(Fan run).
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Thermostat setting.
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RESISTANCE
between Terminal
and the
Compressor Body.
between Terminal
and the
Compressor Body.
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RESISTANCE
between Terminals.
between Terminals.
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Overload Protector.
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Capacitor
Compressor.
Compressor.
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Thermostat.
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Main Control
Switch.
Switch.
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Higher than room
temp.
temp.
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Shorted.
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Shorted.
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Infinity between
Terminals.
Terminals.
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OHM Meter doesn’t
deflect.
deflect.
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No click heard.
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No contacts at
Position Shown.
Position Shown.
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Winding Coil touched to
the compressor shell.
the compressor shell.
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Rear Shorted or Burnt out.
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Overload Protector defect.
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Capacitor defect.
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Thermostat defect.
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Main Control Switch defect.
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Set it lower.
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Replace Compressor.
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Replace Compressor.
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Replace Overload
Protector.
Protector.
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Replace Capacitor
Compressor.
Compressor.
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Replace Thermostat.
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Replace Main Control
Switch.
Switch.
Air Swing won’t run.
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Air Swing Switch.
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Resistance
between wires.
between wires.
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OFF position.
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No contact at
position.
position.
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OHM Meter doesn’t
deflect.
deflect.
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Open circuit.
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Shorted or open circuit.
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Set it ON.
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Replace Air Swing Switch.
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Replace Air Swing Motor.
Insufficient cooling or
heating.
heating.
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Thermostat Setting.
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Ventilation door
open.
open.
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Air filter dirty.
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Location of
installation.
installation.
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Evaporator /
Condenser Coil
obstructed.
Condenser Coil
obstructed.
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Unit capacity for
the room too small.
the room too small.
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Temp difference
and running
current.
and running
current.
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Higher or lower than
room temp.
room temp.
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Open.
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Clogged or dirty.
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Sunlight hitting
outdoor side at
cooling.
outdoor side at
cooling.
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Obstacles.
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Clogged or dirty.
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Not satisfied.
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REFER TO
PERFORMANCE
EVALUATION.
PERFORMANCE
EVALUATION.
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Reduces capacity.
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Restricted air circulation.
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Restricted Heat Exchanger.
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Restricted Heat Exchanger.
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Restricted air circulation.
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Leakage of refrigerant or
refrigeration system is
blocked.
refrigeration system is
blocked.
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Set it lower or higher.
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Close Vent. door.
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Clean or replace Air Filter.
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Consider building an
AWNING.
AWNING.
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Remove obstacles or
reinstall unit.
reinstall unit.
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Clean the coils.
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Replace the unit with
bigger one.
bigger one.
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Locate repair leak.
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Flush refrigeration cycle.
Noise.
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Source of Noise
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Vibration.
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Intermittent Noise.
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Faulty installation.
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Fan hitting objects.
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Refrigerant tubing touching
each other.
each other.
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Reinstall unit or Reinforce
the installation.
the installation.
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Adjust Fan position or
remove foreign materials.
remove foreign materials.
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About 1/2” Clearance
needed.
needed.
Water dripping inside
room.
room.
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Unit installation.
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Drain Tray-
Styrofoam pieces
blocking drain
channel.
Styrofoam pieces
blocking drain
channel.
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Tilted to inside room.
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Clogged.
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Restricted run off.
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Clogged or blocked.
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Tilt unit to outside slightly.
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Remove the foreign
materials.
materials.
Frozen Evaporator
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Thermostat setting.
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Air filter /
Evaporator.
Evaporator.
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Temp. difference
and running
current.
and running
current.
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Set too low for
ambient conditions.
ambient conditions.
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Clogged or Dirty.
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REFER TO
PERFORMANCE
EVALUATION.
PERFORMANCE
EVALUATION.
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Outdoor temp. low (Night
time).
time).
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Restricted air circulation.
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Leakage of refrigerant or
refrigeration system is
blocked.
refrigeration system is
blocked.
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Set the Main Control Knob
to Fan to melt ice and set
the Temp. Control to
higher temperature.
to Fan to melt ice and set
the Temp. Control to
higher temperature.
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Clean Air filter /
Evaporator.
Evaporator.
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Locate and repair leak.
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Flush refrigeration cycle.
No
heating
(Fan
and
Compressor run).
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Reversing
valve
coil.
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Reversing valve.
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Infinity between coil.
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Resistance
between
reversing valve coil.
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Replace
reversing
valve
coil.
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Replace reversing valve.
Frozen Condenser
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Outdoor
ambient
temp.
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Heating operation at
low outdoor ambient
temp.
low outdoor ambient
temp.
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Outdoor ambient temp. is
low.
low.
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Set Main Control Switch to
Fan to melt ice.
Fan to melt ice.
9
CW-A91AE / CW-A121AE
8.1. Parts Identification.
8.1.1. Vertical Airflow Direction Vane.
Airflow direction adjustment Up-and-Down.
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The vertical airflow direction vane may
be
be
positioned
to
deflect
the
air
upwards, downwards or straight on.
8.1.2. Ventilation Lever.
When the slide lever is in the:
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“OPEN” position, the ventilation door is
opened to allow air, smoke and odors to
be expelled from the room.
opened to allow air, smoke and odors to
be expelled from the room.
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“CLOSE” position, the ventilation door is
closed and the air inside the room is
circulated and conditioned.
closed and the air inside the room is
circulated and conditioned.
8.1.3. Operating Conditions.
Use the air conditioner under the following conditions:
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Operating temperature range.
Indoor side
Outdoor side
D.B.T. W.B.T.
D.B.T.
W.B.T.
Cooling Maximum Temperature
32°C
23°C
43°C
26°C
Minimum Temperature
21°C
15°C
21°C
15°C
Heating Maximum Temperature
27°C
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21°C
15°C
Minimum Temperature
20°C
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-5°C
-6°C
D.B.T.: Dry Bulb Temperature
W.B.T.: Wet Bulb Temperature
Note: Humidity may exceed 90%.
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Continuous operation at humidities of over 90% may
create condensation to form on the intake and outlet
vanes.
create condensation to form on the intake and outlet
vanes.
8 Operating Instructions
10
CW-A91AE / CW-A121AE
8.2. How to Operate.
(1) Open the Control Panel Cover.
Fig. 1
(2) Power Supply
Switch off the breaker and set the Main Control Knob to the
OFF position before plugging the power plug into an
electrical outlet.
OFF position before plugging the power plug into an
electrical outlet.
Fig. 2
(3) Main Control Knob
Set the Main Control Knob to either LOW COOLING or
HIGH COOLING and LOW HEATING or HIGH HEATING
as desired, FAN setting operates the fan only.
HIGH COOLING and LOW HEATING or HIGH HEATING
as desired, FAN setting operates the fan only.
Caution: If the Main Control Knob is turned off or
changed to a fan setting from a cooling or heating
operation setting, WAIT at least 3 minutes before
resetting it to cooling or heating operation.
changed to a fan setting from a cooling or heating
operation setting, WAIT at least 3 minutes before
resetting it to cooling or heating operation.
Fig. 3
(4) Thermostat Control Knob
Turn the Thermostat Control Knob as shown in Fig. 4.
Usually “6” ~ “7” is the recommended setting position for
cooling and “4” ~ “5” for heating.
Usually “6” ~ “7” is the recommended setting position for
cooling and “4” ~ “5” for heating.
Note: When the Thermostat Control Knob is set to “10”,
moisture may freeze onto the evaporator fins and prevent
effective cooling. If this happens, turn the Main Control
Knob
moisture may freeze onto the evaporator fins and prevent
effective cooling. If this happens, turn the Main Control
Knob
to
FAN,
and
the
Thermostat
Control
Knob
counterclockwise. This will quickly defrost the evaporator
fins so that normal cooling can be resumed.
fins so that normal cooling can be resumed.
Fig.4
(5) Air Swing Switch
(Airflow direction adjustment side-to-side)
To obtain a fixed airflow direction, set the Air Swing Switch
to “ON” for the vanes to swing from side to side until the
desired flow direction is reached, then switch it to “OFF”.
to “ON” for the vanes to swing from side to side until the
desired flow direction is reached, then switch it to “OFF”.
For continuous side-to-side air circulation, set the Air Swing
Switch to “ON”.
Switch to “ON”.
Fig. 5
11
CW-A91AE / CW-A121AE
9 How to Install
9.1. Before installing the air conditioner, please read the following:
9.1.1. Electrical Work.
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Always use at the rated voltage and with a specific air conditioning circuit.
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Power supply point shall be the place where there is ease for the power disconnection in case of emergency.
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Some installation locations may require installation of a short-circuit breaker.
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A 16 Ampere time delay fuse or circuit breaker is required.
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Nominal cross sectional area of power supply wire must be 3 core x 1.0 mm
2
or above.
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The power supply must be from an independent circuit.
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All electrical installation must be made in accordance with local wiring and safety regulations wherever applicable.
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There must be a double pole switch with minimum of 3 mm contact gap in the fixed installation circuit (Applicable for models
without power supply plug only).
without power supply plug only).
9.1.2. Select the Best Location.
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Install the unit at the nearest power outlet.
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The air conditioner should be installed in a dry place where there are no draughts.
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Condensation from the air conditioner must be drained into an appropriate location.
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Do not install in a location where flammable gas leaks is a possibility.
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Usage in locations where the air is salty such as coastal areas or near hot spas, or where sulphurous gas is generated, may
lead to a malfunction.
lead to a malfunction.
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Do not install this appliance in a laundry room or other locations where water may drip from the ceiling, etc.
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Select an installation location which is rigid and strong enough to support or hold the unit and select a location for easy
maintenance.
maintenance.
9.2. Preparation for Installation.
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There should not be any obstacles surrounding the unit.
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Prepare an installation hole that is only slightly bigger than the cabinet size.
12
CW-A91AE / CW-A121AE
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