Panasonic Cu 3ks19nbucu 4ksxxnbu Technical Service Manual

IMPORTANT
These air conditioners employ new
refrigerant R410A.
Pay special attention when
servicing the unit.
Wall mounted type
CS-MKS7NKU
CS-MKS9NKU
CS-MKS12NKU
CS-MKS18NKU
CS-MKS24NKU< Applicable Indoor Units >
TECHNICAL & SERVICE MANUAL
OUTDOOR UNIT : CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU
DC INVERTER MULTI-SYSTEM AIR CONDITIONER
Product Code No.
1 852 361 24
1 852 361 25
1 852 361 26
REFERENCE NO. 
SM700877
Capacity at 230V
19,700 BTU/h
25,400 BTU/h
30,600 BTU/hOutdoor Model No.
CU-3KS19NBU
CU-4KS24NBU...

•  Before doing repair work, please read the "     SAFETY PRECAUTIONS" carefully and fully understand them. 
•  The precautionary items here are divided into "     Warning" and "     Caution" items. 
Items in particular which may cause death or serious injury to the service personnel if the work is not performed correctly, 
are included in the "     Warning" table.
However, even precautionary items identified as "     Caution" also have the potential for serious...

Warning
If refrigerant gas blows off during the work, do not touch the refrigerant gas as it may cause frostbite.
If refrigerant gas leaks during the work, ventilate the room.
If refrigerant gas catches fire, harmful gas may be generated.
Do not mix any gas other than the specified refrigerant gas in the refrigerating cycle. 
If air or other contaminants mix with the gas, pressure will become extremely high in the refrigerating cycle, 
which may cause a unit breakdown."
When the welded section of the...

Table of Contents
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A-1 .........................................................................
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    APPLICABLE INDOOR UNITS
CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU Multi-Outdoor UnitIndoor Unit3-Room
4-Room
4-Room
CS-MKS7NKU
YES
YES
YESYES
YES
YESYES
YES
YESYES
YES
YESNO
YES
YES
CS-MKS9NKU CS-MKS12NKU CS-MKS18NKU CS-MKS24NKU
Wall Mounted Type
CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU Multi-Outdoor UnitIndoor Unit3-Room
4-Room
4-Room
CS-MKS9NB4U&
CZ-18BT1U
YES
YES
YESYES
YES
YESYES
YES
YESCS-MKS12NB4U&
CZ-18BT1UCS-KS18NB4UW&
CZ-18BT1U
Semi-Concealed Type
6 

95 °F DB / 71 °F WB
67 °F DB / 57 °F WB
1.  OPERATING RANGE
Maximum
Minimum115 °F DB
  14 °F DB Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp.
Cooling
7 

2.  SPECIFICATIONS
2-1.  Unit Specifications
Outdoor UnitCU-3KS19NBU
Indoor UnitCS-MKS9NKU × 2
< 230V >
DATA SUBJECT TO CHANGE WITHOUT NOTICE. Compressor
Refrigerant / Amount charged at shipment Ibs (g)
Refrigerant Control6.3
1,420 17,000
5.00( 6,800 to 18,800 )
( 1.90 to 5.50 )
Shipping VolumeCooling
14,300
2,700
Net
Shipping Package Dimensions
WeightHeight × Width × Depth
Height × Width × Depth
Ibs (kg)
Ibs (kg)
cu.ft (m
3) (mm)
inch
(mm)3-Room Multi Outdoor Unit
Outdoor Unit
inch187 to 253
 Dimensions...

Outdoor UnitCU-3KS19NBU
Indoor UnitCS-MKS9NKU ×
3
Remarks:
1.  The values shown in performance section and electrical rating section above are based on the following unit combination.
  For other combination unit, please refer to the "Unit Combination Tables" in this manual.
                     Indoor Unit : CS-MKS9NKU   3units        Outdoor Unit : CU-3KS19NBU  1unit
2.  Rating conditions are:  Cooling :  Indoor air temp.  80 °F DB / 67 °F WB
      Outdoor air temp.  95 °F DB / 75 °F WB
< 230V...

Outdoor UnitCU-3KS19NBU
Indoor UnitCS-MKS9NKU ×
3
< 208V >
Remarks:
1.  The values shown in performance section and electrical rating section above are based on the following unit combination.
  For other combination unit, please refer to the "Unit Combination Tables" in this manual.
                     Indoor Unit : CS-MKS9NKU   3units        Outdoor Unit : CU-3KS19NBU  1unit
2.  Rating conditions are:  Cooling :  Indoor air temp.  80 °F DB / 67 °F WB
      Outdoor air temp.  95 °F DB / 75 °F...