Panasonic Cu 3ks19nbucu 4ksxxnbu Technical Service Manual

5
2.  Installation Site Selection
2-1.  Indoor Unit
AVOID:

direct sunlight.

nearby heat sources that may affect performance of the
unit.

areas where leakage of flammable gas may be expected.

placing or allowing any obstructions near the air conditioner
inlet or outlet.

installing in rooms that contain instant-on (rapid-start) 
fluorescent lamps. (These may prevent the air conditioner
from receiving signals.)

places where large amounts of oil mist exist.

installing in locations where there are...

6

install the indoor unit more than 3.3 (1 m) away from any
antenna or power lines or connecting wires used for tele-
vision, radio, telephone, security system, or intercom.
Electrical noise from any of these sources may affect
operation.

install in a sturdy manner to avoid increased operating
noise.
Table 3
*If total tubing length becomes 150 to 200 ft. (Max.) or 150 to 230 ft. (Max.), charge additional refrigerant (R410A) by 0.22 oz./ft.
No additional charge of compressor oil is necessary. For more...

7
Fig. 4b
Union 1/2(12.70mm)1/2(12.70
mm)
Flare 3/8(9.52
mm)
A joint for connecting tubes of
different sizes
(3/8(9.52
mm)     1/2(12.70mm)) Supplied Reducer
1/4(6.35mm)
1/4(6.35
mm)
1/4(6.35
mm) C
B
AOutdoor unit Indoor unit
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U) (CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
(CS-MKS18NKU)
(CS-KS18NB4UW)
3/8(9.52mm)3/8(9.52
mm)
3/8(9.52
mm)
3/8(9.52
mm)
3/8(9.52
mm)
(A)
Fig. 4c
C
B
A(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)...

8
(B)
Fig. 4d
C
B
A(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U) (CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U) DOutdoor unit Indoor unit
(CS-MKS18NKU)
(CS-KS18NB4UW)
1/2(12.70
mm)1/2(12.70
mm)
3/8(9.52
mm)
3/8(9.52
mm) 3/8(9.52mm)
3/8(9.52
mm)
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
3/8(9.52
mm)3/8(9.52
mm)
1/4(6.35
mm) 1/4(6.35
mm)
1/4(6.35
mm) 1/4(6.35
mm)
(D)
Fig. 4f
Locally purchased
C
B(CS-MKS18NKU)
(CS-KS18NB4UW) D Outdoor unit Indoor...

9
(A)
Fig. 4g
Union 3/8(9.52mm) Flare 1/2(12.70mm) (1/2(12.70
mm)     3/8(9.52mm)) Supplied Reducer
D
C(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U) Outdoor unit Indoor unit
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
1/2(12.70mm)
1/2(12.70
mm)3/8(9.52
mm)
3/8(9.52
mm)
A
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
B
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
3/8(9.52
mm)3/8(9.52
mm)
3/8(9.52
mm)
3/8(9.52
mm)1/4(6.35
mm)
1/4(6.35...

10
(D)
Fig. 4j
Union 5/8(15.88mm) Flare 1/2(12.70mm) (1/2(12.70
mm)     5/8(15.88mm))Locally purchased
C
D
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U) Outdoor unit Indoor unit
(CS-MKS24NKU)
Union 3/8(9.52mm) Flare 1/2(12.70mm)
(1/2(12.70
mm)     3/8(9.52mm))Supplied Reducer
1/2(12.70mm) 1/2(12.70
mm)5/8(15.88
mm)
3/8(9.52
mm)
A
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)
(CS-MKS9NB4U,CS-MKS12NB4U)
3/8(9.52
mm)3/8(9.52
mm)
1/4(6.35
mm)
B
(CS-MKS7NKU,CS-MKS9NKU,CS-MKS12NKU)...

2-3.  Outdoor Unit
AVOID:

heat sources, exhaust fans, etc. (Fig. 5a)

damp, humid or uneven locations.
DO:

choose a place as cool as possible.

choose a place that is well ventilated.

install in a location where at least two sides are unob-
structed, so that the flow of air at the intake port or
exhaust port is not blocked, and so that sufficient 
space is ensured for maintenance to be carried out 
without trouble. In general the top also must be unob-
structed. (Fig. 5b)

provide a solid base (level...

12
(1) Recommended dimensions of the baffle plates
D
F E CJH
L
I
BK Q R A
GO
(3-    6.5 mm)
3-    1/4"
(2-    6 mm) 2-    15/64"
AB
H
C
E
FK I
J
G G
D
(4-    6.5 mm)4-    1/4"
Fig. 5h
For Air Intake
For Air Discharge
Material to be used:  Metal plate with corrosion protection treatment
Plate thickness: 0.0394 to 0.0472 (1.0 to 1.2 mm)
(2) Parts required (field supply except for screws)
Dimensions
ABCDE FGH I J K LOQR
Model
CU-3KS19NBU,(inch)25-3/16 25/32 1-31/32 25 10-5/8 10-5/8 25/64 25/32...

13
(3) Installation procedure
Panel top
Panel front Panel side R
Panel side L
1. Air Intake Baffle
(1) Left side
1. Remove the top panel from the unit.
2. Remove the panel side L, and drill 3 holes of ø1/4 inch
(6.5 mm) at the prescribed position.
3. Install the windbaffle on the unit using field supply bolts
and nuts.
4. Recommended bolts to be used are 15/64 (M6 ISO 
standard), and the recommended length of the bolts is
between 19/32 – 25/32 inch (15 – 20 mm).
5. Use washers and spring washers to...

14
Fig. 6a
23-15/165-11/32
15/32
35-7/16 (900)
13-19/32 12-19/32
14-17/32
2-29/32
29-1/8 (740) 23/32
1-13/16
2-1/165-29/322-27/32
2-3/42-1/324-7/16
2-15/162-3/44-1/2
A
Service valve on narrow tube side
(Outer diameter 1/4"(
6.35))
Service valve on wide tube side
(Outer diameter 3/8"(
9.52))A
(1) CU-3KS19NBU
Fig. 6b
23-15/165-11/32
15/32
12-19/32
13-19/32
14-17/32
35-7/16 (900)
29-1/8 (740)
2-1/16 1-13/16 2-29/32
2-13/32
A
4-1/2 2-1/325-29/322-27/32
2-3/4
4-7/16
2-15/162-3/4
Service valve on...