Panasonic Cu 3ks19nbucu 4ksxxnbu Technical Service Manual

Wide tube service valve
dia.3/8" (9.52) ×3
Narrow tube service valve
dia.1/4" (6.35) ×3
4-7/165-29/32 2-27/32 2-3/4
2-1/32 4-1/2
2-15/16
2-3/429-1/8(740) 23/32
1-13/16 35-7/16(900)23-15/16 5-11/32
15/32
12-19/32(320)
13-19/32
14-17/32
11-17/32
ID:23/322-ID:15/161-3/8
2-15/16
2-1/16
3.  DIMENSIONAL DATA
Outdoor Unit  CU-3KS19NBU
Unit: inch(mm)
(852-0-0010-11500-0)
21 

Wide tube service valve
dia.1/2" (12.70) ×1
Narrow tube service valve
dia.1/4" (6.35) 
×4
Wide tube service valve
dia.3/8" (9.52) ×3
4-7/165-29/32 2-27/32 2-3/4
2-3/4
2-1/32 4-1/2
2-15/16
2-3/4
2-3/429-1/8(740) 23/32
1-13/16 35-7/16(900)23-15/16 5-11/32
15/32
12-19/32(320)
13-19/32
14-17/32
11-17/32
ID:23/322-ID:15/161-3/8
2-15/16
2-1/16
2-13/32
 
Outdoor Unit       CU-4KS24NBU
Unit: inch(mm)
(852-0-0010-20500-0)
  
22 

Wide tube service valve
dia.1/2" (12.70) ×2
Narrow tube service valve
dia.1/4" (6.35) ×4
Wide tube service valve
dia.3/8" (9.52) ×2
4-7/165-29/32
2-1/32 4-1/2
2-15/16
2-3/4
2-3/435-1/32(890) 23/32
1-13/16 35-7/16(900)23-15/16 5-11/32
15/32
12-19/32(320)
13-19/32
14-17/32
11-17/32
ID:23/322-ID:15/161-3/8
2-15/16
2-1/16
2-13/32
 
Outdoor Unit       CU-4KS31NBU
Unit: inch(mm)
(852-0-0010-20600-0)
2-7/8 2-3/4
2-3/4
23 

Compressor
High pressure
switch
H.P. Main
accumulator Sub
accumulator
Service valve on
narrow tube Service valve on
wide tube
CN
BN
ANCW
BW
AW
O.D.1/4"
O.D.1/4"
O.D.1/4" O.D.3/8"
O.D.3/8"
O.D.3/8"
Heat exchanger
Cooling cycle
Indoor unit Outdoor unit
StrainerHeader Header
M
M
M
Wide tube
Narrow tube
4.  REFRIGERANT FLOW DIAGRAM
4-1.  Refrigerant Flow Diagram
Outdoor Unit CU-3KS19NBU
Insulation of Refrigerant Tubing
Because capillary tubing is used in the outdoor unit, both the...

Outdoor Unit CU-4KS24NBU
Insulation of Refrigerant Tubing
Because capillary tubing is used in the outdoor unit, both the
wide and narrow tubes of this air conditioner become cold. To
prevent heat loss and wet floors due to dripping of
condensation, both tubes must be well insulated with a 
proper insulation material. The thickness of the insulation
should be a min.5/16"(8 mm).
After a tube has been insulated,
never try to bend it into a narrow
curve because it can cause the tube
to break or crack....

Service valve on
narrow tubeElectric 
expansion 
valve Service valve on
wide tube 
DN
CN
BN
AN DW
CW
BW
AW
O.D.1/4"
O.D.1/4"
O.D.1/4"
O.D.1/4" O.D.1/2"
O.D.1/2"
O.D.3/8"
O.D.3/8"
Cooling cycle
StrainerHeader Header
M
M
M
M
Indoor unit Outdoor unit
Wide tube
Narrow tube
Outdoor Unit CU-4KS31NBU
Insulation of Refrigerant Tubing
Because capillary tubing is used in the outdoor unit, both the
wide and narrow tubes of this air conditioner become cold. To
prevent heat loss and...

Cooling Characteristics(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
(2) Operating current performance chart
(3) Indoor discharge air performance chart
•  This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on 
  the indoor unit type.
•  Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
  (In this case, be sure to stop all the...

Cooling Characteristics(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
(2) Operating current performance chart
(3) Indoor discharge air performance chart
•  This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on 
  the indoor unit type.
•  Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
  (In this case, be sure to stop all the...

Outdoor Unit   CU-3KS19NBU    Indoor Unit   CS-MKS12NKU ×1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
(2) Operating current performance chart
(3) Indoor discharge air performance chart
•  This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on 
  the indoor unit type.
•  Check each performance value in test-run mode. Electrical performance values represent a combined...

Cooling Characteristics(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart
(2) Operating current performance chart
(3) Indoor discharge air performance chart
•  This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on 
  the indoor unit type.
•  Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
  (In this case, be sure to stop all the...