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Panasonic Cu 3ke19nbucu Technical Service Manual

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    							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)
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    							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)
  
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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
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    							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 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.
Wide tubeThickness:
Min.5/16"(8 mm)
Insulation
Narrow tube Thickness:
Min.5/16"(8 mm)
IMPORTANT
CAUTION
Electric 
expansion 
valve
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    							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 into a narrow
curve because it can cause the tube
to break or crack.
Wide tubeThickness:
Min.5/16"(8 mm)
Insulation
Narrow tube Thickness:
Min.5/16"(8 mm)
IMPORTANT
CAUTION
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.3/8"
O.D.3/8"
O.D.3/8"Heat exchanger
Cooling cycle
Heating cycle
Defrosting cycle
StrainerHeader Header
S
M
M
M
M
Indoor unit Outdoor unit
Wide tube
Narrow tube
25
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    							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 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.
Wide tubeThickness:
Min.5/16"(8 mm)
Insulation
Narrow tube Thickness:
Min.5/16"(8 mm)
IMPORTANT
CAUTION
26
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    							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 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 indoor units where performance is not being checked.)
•  The performance is for a tubing length of 24.6t (7.5m). If the tubing length is different, the performance chart will vary.
NOTE
Low pressure at wide tube service valve
psig (MPaG)
High pressure at wide tube service valve
psig (MPaG)
Outdoor air temperature °F (°C) Outdoor air temperature °F (°C)
174
(1.2)188
(1.3)
160
(1.1)
146
(1.0)
77
(25)86
(30)95
(35)104
(40)23
(-5)32
(0)41
(5)50
(10)59
(15)68
(20)77
(25)
23
(-5)32
(0)41
(5)50
(10)59
(15)68
(20)77
(25)
23
(-5)32
(0)41
(5)50
(10)59
(15)68
(20)77
(25)
Lo fan Hi fanHH fan506
(3.5)
434
(3.0)
362
(2.5)
290
(2.0)
Operating current (A)
Operating current (A)
Outdoor air temperature °F (°C) Outdoor air temperature °F (°C) 4 5
3
2
Lo fan Hi fanHH fan
7 8
6
5
Indoor discharge air temperature °F (°C)
Indoor discharge air temperature °F (°C)
Outdoor air temperature °F (°C) Outdoor air temperature °F (°C) 46.4(  8)
68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
77(25) 131(55) 140(60)
122(50)
113(45)
104(40)
95(35)
86(30)Lo fan Hi fanHH fan
Outdoor Unit   CU-3KE19NBU    Indoor Unit   CS-MKE7NKU×1
5-1-1.  Temperature Charts (CU-3KE19NBU)
77
(25)86
(30)95
(35)104
(40)
77
(25)86
(30)95
(35)104
(40)
5.  PERFORMANCE DATA
5-1.  Temperature Charts
Indoor air temp. 86°F (30°C)80°F (27°C)
75°F (24°C)
Indoor air temp. 86°F (30°C)
80°F (27°C)75°F (24°C)
Indoor air temp. 86°F (30°C)
80°F (27°C)
75°F (24°C)
Indoor air temp. 73°F (23°C)70°F (21°C)63°F (17°C)
Indoor air temp. 73°F (23°C)70°F (21°C)
63°F (17°C)
Indoor air temp. 73°F (23°C)
70°F (21°C)
63°F (17°C)
27
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    							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 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 indoor units where performance is not being checked.)
•  The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
NOTE
Low pressure at wide tube service valve
psig (MPaG)
High pressure at wide tube service valve
psig (MPaG)
Outdoor air temperature °F (°C) Outdoor air temperature °F (°C)
Lo fan Hi fan
Operating current (A)
Operating current (A)
Outdoor air temperature °F (°C) Outdoor air temperature °F (°C) 5 6
4
3
Lo fan Hi fan
7 8
6
5
Indoor discharge air temperature °F (°C)
Indoor discharge air temperature °F (°C)
Outdoor air temperature °F (°C) Outdoor air temperature °F (°C)
Lo fan Hi fan
Outdoor Unit   CU-3KE19NBU    Indoor Unit   CS-MKE9NKU ×1
HH fan
HH fan
HH fan 174
(1.2)188
(1.3)
160
(1.1)
146
(1.0)
77
(25)86
(30)95
(35)104
(40)23
(-5)32
(0)41
(5)50
(10)59
(15)68
(20)77
(25) 506
(3.5)
434
(3.0)
362
(2.5)
290
(2.0)
46.4(  8) 68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
77
(25)86
(30)95
(35)104
(40) 77
(25)86
(30)95
(35)104
(40)23
(-5)32
(0)41
(5)50
(10)59
(15)68
(20)77
(25)
23
(-5)32
(0)41
(5)50
(10)59
(15)68
(20)77
(25) 77(25) 131(55) 140(60)
122(50)
113(45)
104(40)
95(35)
86(30)
Indoor air temp. 86°F (30°C)80°F (27°C)
75°F (24°C)
Indoor air temp. 86°F (30°C)80°F (27°C)75°F (24°C)
Indoor air temp. 86°F (30°C)
80°F (27°C)
75°F (24°C)
Indoor air temp. 73°F (23°C)70°F (21°C)
63°F (17°C)
Indoor air temp. 73°F (23°C)70°F (21°C)63°F (17°C)
Indoor air temp. 73°F (23°C)
70°F (21°C)
63°F (17°C)
Indoor air temp. 73°F (23°C)70°F (21°C)63°F (17°C)
Indoor air temp. 73°F (23°C)70°F (21°C)63°F (17°C)
28
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    							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 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 indoor units where performance is not being checked.)
•  The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
NOTE
Low pressure at wide tube service valve
psig (MPaG)
High pressure at wide tube service valve
psig (MPaG)
Outdoor air temperature °F (°C) Outdoor air temperature °F (°C)
Lo fan Hi fan
506
(3.5)578
(4.0)
434
(3.0)
362
(2.5)
Operating current (A)
Operating current (A)
Outdoor air temperature °F (°C) Outdoor air temperature °F (°C) 5 6
4
3
Lo fan Hi fan
7 9
3 5 8 10
4 6
Indoor discharge air temperature °F (°C)
Indoor discharge air temperature °F (°C)
Outdoor air temperature °F (°C) Outdoor air temperature °F (°C)
Lo fan Hi fan
HH fan
HH fan
HH fan 160
(1.1)174
(1.2)
146
(1.0)
132
(0.9)
77
(25)86
(30)95
(35)104
(40)23
(-5)32
(0)41
(5)50
(10)59
(15)68
(20)77
(25)
23
(-5)32
(0)41
(5)50
(10)59
(15)68
(20)77
(25)
23
(-5)32
(0)41
(5)50
(10)59
(15)68
(20)77
(25) 77
(25)86
(30)95
(35)104
(40)
77
(25)86
(30)95
(35)104
(40)77(25) 131(55) 140(60)
122(50)
113(45)
104(40)
95(35)
86(30)
46.4(  8) 68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
Indoor air temp. 86°F (30°C)
80°F (27°C)
75°F (24°C)
Indoor air temp. 86°F (30°C)
80°F (27°C)
75°F (24°C)
Indoor air temp. 86°F (30°C)
80°F (27°C)
75°F (24°C)
Indoor air temp. 73°F (23°C)
63°F (17°C)
Indoor air temp. 73°F (23°C)63°F (17°C)
Indoor air temp. 73°F (23°C)63°F (17°C)
Indoor air temp. 73°F (23°C)
63°F (17°C)
Indoor air temp. 73°F (23°C)63°F (17°C)
Indoor air temp. 73°F (23°C)63°F (17°C)
20°F (21°C)70°F (21°C)
70°F (21°C)70°F (21°C)
70°F (21°C)70°F (21°C)
29
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    							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 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 indoor units where performance is not being checked.)
•  The performance is for a tubing length of 24.6ft (7.5m). If the tubing length is different, the performance chart will vary.
NOTE
Low pressure at wide tube service valve
psig (MPaG)
High pressure at wide tube service valve
psig (MPaG)
Outdoor air temperature °F (°C) Outdoor air temperature °F (°C)
160
(1.1)174
(1.2)
146
(1.0)
132
(0.9)
Lo fan Hi fan
506
(3.5)578
(4.0)
434
(3.0)
362
(2.5)
Operating current (A)
Operating current (A)
Outdoor air temperature °F (°C) Outdoor air temperature °F (°C) 7 8
6
5
Lo fan Hi fan
10 12
6 8 9 11
7
Indoor discharge air temperature °F (°C)
Indoor discharge air temperature °F (°C)
Outdoor air temperature °F (°C) Outdoor air temperature °F (°C)
Lo fan Hi fan
Outdoor Unit   CU-3KE19NBU     Indoor Unit   CS-MKE18NKU ×1
HH fan
HH fan
HH fan 77
(25)86
(30)95
(35)104
(40)
77
(25)86
(30)95
(35)104
(40)
77
(25)86
(30)95
(35)104
(40)23
(-5)32
(0)41
(5)50
(10)59
(15)68
(20)77
(25)
23
(-5)32
(0)41
(5)50
(10)59
(15)68
(20)77
(25)
23
(-5)32
(0)41
(5)50
(10)59
(15)68
(20)77
(25) 77(25) 131(55) 140(60)
122(50)
113(45)
104(40)
95(35)
86(30)
46.4(  8) 68.0(20)
64.4(18)
60.8(16)
57.2(14)
53.6(12)
50.0(10)
Indoor air temp. 86°F (30°C)
80°F (27°C)
75°F (24°C)
Indoor air temp. 86°F (30°C)
80°F (27°C)
75°F (24°C)
Indoor air temp. 86°F (30°C)
80°F (27°C)
75°F (24°C)
Indoor air temp. 73°F (23°C)70°F (21°C)63°F (17°C)
Indoor air temp. 73°F (23°C)70°F (21°C)
63°F (17°C)
Indoor air temp. 73°F (23°C)70°F (21°C)
63°F (17°C)
Indoor air temp. 73°F (23°C)70°F (21°C)63°F (17°C)
Indoor air temp. 73°F (23°C)70°F (21°C)
63°F (17°C)
Indoor air temp. 73°F (23°C)70°F (21°C)
63°F (17°C)
30
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