Panasonic CS-A120TE / CS-A180TE / CS-A240TE / CU-A120TE / CU-A180TE / CU-A240TE Service Manual ▷ View online
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CS-A120TE
Pump-Down Terminal
•
The thermostat will be switched ON (even if the room
temperature is low) when the pump-down terminal is short-
circuited (by using alligator-type clips or a similar method),
thus permitting easy pump-down when the unit is to be
moved to another place.
temperature is low) when the pump-down terminal is short-
circuited (by using alligator-type clips or a similar method),
thus permitting easy pump-down when the unit is to be
moved to another place.
For changing the Wireless Remote Control
Transmitter’s Oscillation Code
Transmitter’s Oscillation Code
•
If two or more air conditioners are located in the same
room, any one of four oscillation codes can be selected by
simply adding parts to the Remote Control Printed Circuit
Board and to the indoor unit Main Control P.C.B.
(If the two or more air conditioners in one room have the
same oscillation code, all of them will be activated by
operation of one Remote Control transmitter.)
room, any one of four oscillation codes can be selected by
simply adding parts to the Remote Control Printed Circuit
Board and to the indoor unit Main Control P.C.B.
(If the two or more air conditioners in one room have the
same oscillation code, all of them will be activated by
operation of one Remote Control transmitter.)
•
By adding a jumper wire at the Remote Control P.C.B.
side and a carbon resistor (1/4W) to the Main Control
P.C.B. as shown in the table at the right, any one of four
oscillation codes, including the one at the time of
shipment from the plant (No.0), can be selected.
side and a carbon resistor (1/4W) to the Main Control
P.C.B. as shown in the table at the right, any one of four
oscillation codes, including the one at the time of
shipment from the plant (No.0), can be selected.
P.C.B.
Remote Control
transmitter
P.C.B.
Main Control
J-B
J-A
R-X
Microcomputer
IC1
IC1
No. 0
No. 1
No. 2
No. 3
P.C.B.
Remote Control
J-A
—
—
J-B
—
—
P.C.B.
Main Control
RX
—
16k
6.2k
0
Remarks
As shipped from factory
\
\
\
\
Pump-down terminal
Blue Connector
(CN-PUMP)
Servicing Information
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CS-A120TE
Refrigeration cycle system
In order to diagnose malfunctions, make sure that
there are no electrical problems before inspect-
ing the refrigeration cycle. Such problems include
insufficient insulation, problem with the power source,
malfunction of a compressor or a fan.
The normal outlet air temperature and pressure
of the refrigeration cycle depends on various condi-
tions; the standard values for them are shown in the
table on the right.
there are no electrical problems before inspect-
ing the refrigeration cycle. Such problems include
insufficient insulation, problem with the power source,
malfunction of a compressor or a fan.
The normal outlet air temperature and pressure
of the refrigeration cycle depends on various condi-
tions; the standard values for them are shown in the
table on the right.
Normal Pressure and Outlet Air Temperature (Standard)
Cooling mode
Heating Mode
Outlet air
temperature
(°C)
12 ~ 16
36 ~ 45
●
Measure the electric current
during operation
during operation
●
Measure the gas side pressure
●
Measure the air temperature
difference
difference
Less than 8°C at cooling mode
Less than 14°C at heating mode
Less than 14°C at heating mode
Troubleshooting Guide
★
Condition: Indoor fan speed; High
Outdoor temperature is 35°C at cooling mode
and 7°C at heating mode
and 7°C at heating mode
Gas pressure
MPa
(kg/cm
2
G)
0.4 ~ 0.6 (4 ~ 6)
1.5 ~ 2.1 (15 ~ 21)
Difference in the intake
and outlet
air temperatures
Above 8°C
(15 minutes after an
operation is started.)
at cooling mode
Above 14°C
(15 minutes after an
operation is started.)
at heating mode
Normal
Value of electric
current during operation
Higher than specified
Dusty condenser
preventing heat radiation
Excessive amount
of refrigerant
Lower than specified
Gas side
pressure
Cooling Mode
Low
Inefficient compressor
Insufficient refrigerant
Clogged strainer or
capillary tube
Inefficient compressor
Insufficient refrigerant
Clogged strainer or
capillary tube
Low
Low
Low
Low
High
Heating Mode
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CS-A120TE
2. Diagnosis methods of a malfunction of a compressor and a 4-way valve
Nature of fault
Insufficient compressing of a
compressor
compressor
Locked compressor
Inefficient switches of the 4-way valve
Symptom
1. Relationship between the condition of the air conditioner and pressure and
electric current
Cooling Mode
Condition of the air
conditioner
Insufficient refrigerant
(gas leakage)
(gas leakage)
Clogged capillary tube
or Strainer
or Strainer
Short circuit in the
indoor unit
indoor unit
Heat radiation defi-
ciency of the outdoor
unit
ciency of the outdoor
unit
Inefficient
compression
compression
Low Pressure
●
Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is
started.
●
Electric current during operation becomes approximately 20% lower than the
normal value.
normal value.
●
The discharge tube of the compressor becomes abnormally hot (nor-
mally 70 to 90°C).
mally 70 to 90°C).
●
The difference between high pressure and low pressure becomes
almost zero.
almost zero.
●
Electric current reaches a high level abnormally, and the value exceeds the
limit of an ammeter. In some cases, a breaker turns off.
limit of an ammeter. In some cases, a breaker turns off.
●
The compressor is a humming sound.
●
Electric current during operation becomes approximately 80% lower than
the normal value.
the normal value.
●
The temperature difference between from the discharge tube to the 4-way valve
and from suction tube to the 4-way valve becomes almost zero.
and from suction tube to the 4-way valve becomes almost zero.
Troubleshooting Guide
Heating Mode
High Pressure
Electric
current during
operation
Low Pressure
High Pressure
Electric
current during
operation
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CS-A120TE
Technical Data
L
L
L
L
L
Thermostat characteristics
• CS-A120T
• CS-A180T
• CS-A240T
• Cooling
• Heating
L
L
L
L
L
Operation characteristics
Cooling characteristics – Outdoor temperature
(Conditions: Room Temperature; 27°C (D.B.T.)
Cooling operation; at High Fan)
(Conditions: Room Temperature; 27°C (D.B.T.)
Cooling operation; at High Fan)
Heating characteristics – Outdoor temperature
(Conditions: Room Temperature; 21°C (D.B.T.)
Heating operation; at High Fan)
(Conditions: Room Temperature; 21°C (D.B.T.)
Heating operation; at High Fan)
• CS-A120T
• CS-A180T
• CS-A240T
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