Panasonic Cu 3ke19nbucu 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:23/325-ID:15/161-3/8
2-15/16
2-1/16
3.  DIMENSIONAL DATA
Outdoor Unit  CU-3KE19NBU
Unit: inch(mm)
(852-0-0010-11200-0)
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:23/325-ID:15/161-3/8
2-15/16
2-1/16
2-13/32
 
Outdoor Unit       CU-4KE24NBU
Unit: inch(mm)
(852-0-0010-20400-0)
  
22 

 
Outdoor Unit       CU-4KE31NBU
Unit: inch(mm)
(852-0-0010-20300-0)
  
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:23/325-ID:15/161-3/8
2-15/16
2-1/16
2-13/32
2-7/8 2-3/4
2-3/4
23 

Compressor
4-way
valveHigh 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
Heating cycle
Defrosting cycle
Indoor unit Outdoor unit
Defrost valve for
hot gas bypass
StrainerHeader Header
S
M
M
M
Wide tube
Narrow tube
4.  REFRIGERANT FLOW DIAGRAM
4-1.  Refrigerant Flow Diagram
Outdoor Unit CU-3KE19NBU
Insulation of...

4-way
valveHigh pressure
switch
H.P.
Defrost valve for
hot gas bypass
Outdoor Unit CU-4KE24NBU
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...

Compressor
Main
accumulator Sub
accumulator
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"Heat exchanger
Cooling cycle
Heating cycle
Defrosting cycle
StrainerHeader Header
S
M
M
M
M
4-way
valveHigh pressure
switch
H.P.
Defrost valve for
hot gas bypass
Indoor unit Outdoor unit
Wide tube
Narrow tube
Outdoor Unit CU-4KE31NBU
Insulation of...

Cooling Characteristics(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)Heating Characteristics(RH : 85%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart (1) High pressure performance chart
(2) Operating current performance chart (2) Operating current performance chart
(3) Indoor discharge air 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...

Cooling Characteristics(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)Heating Characteristics(RH : 85%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart (1) High pressure performance chart
(2) Operating current performance chart (2) Operating current performance chart
(3) Indoor discharge air 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...

Outdoor Unit   CU-3KE19NBU    Indoor Unit   CS-MKE12NKU ×1
Cooling Characteristics
(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)
Heating Characteristics
(RH : 85%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart (1) High pressure performance chart
(2) Operating current performance chart (2) Operating current performance chart
(3) Indoor discharge air performance chart (3) Indoor discharge air performance chart
•  This performance chart shows operation of a single...

Cooling Characteristics(RH : 46%, Indoor fan speed : High fan)
(230V, 60Hz)Heating Characteristics(RH : 85%, Indoor fan speed : High fan)
(230V, 60Hz)
(1) Low pressure performance chart (1) High pressure performance chart
(2) Operating current performance chart (2) Operating current performance chart
(3) Indoor discharge air 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...