Panasonic Inverter Air Conditioner R410A Technical Data And Service Manual

							1-75
1. Specifications
5. SELECTING THE INSTALLATION SITE
5-1. Indoor Unit
AVOID:
  areas where leakage of flammable gas may be 
expected.
  places where large amounts of oil mist exist.
 direct sunlight.
  locations near inverter lamps which may affect the
performance of the unit.
  locations near heat sources which may affect the 
performance of the unit.
  locations where external air may enter the room 
directly. This may cause “sweating” on the air dis-
charge ports, causing them to spray or drip.
  locations where the remote controller will be splashed 
with water or affected by dampness or humidity.
  installing the remote controller behind curtains or 
furniture.
  locations where the receiver in the indoor unit is 
exposed to the inverter lamp light. Faulty operation 
of the unit occurs.
DO:
  select an appropriate position from which every 
corner of the room can be uniformly cooled.
  select a location where the ceiling is strong enough 
to support the weight of the unit.
  select a location where tubing and drain pipe have 
the shortest run to the outdoor unit.
  allow room for operation and maintenance as well as 
unrestricted air flow around the unit.
  install the unit within the maximum elevation 
difference above or below the outdoor unit and within 
a total tubing length (L) from the outdoor unit as 
detailed in the installation instructions packed with 
the outdoor unit.
  allow room for mounting the remote controller about 
3 ft. off the floor, in an area that is not in direct 
sunlight nor in the flow of cool air from the indoor 
unit.
NOTE
Air delivery will be degraded if the distance from the 
floor to the ceiling is greater than 10 ft.
Ceiling Type
The rear of the indoor unit can be installed flush 
against the wall. 
Min. 2 ft.  Air intake 
Air 
discharge 
Min. 10 inch 
Ceiling 
Wall 
Max 25 cm
NOTE 
Min. 10 inch 
Side view  Front view 
Ceiling 
Wall Mounted Type
Min.
6 inch
Min.
12 inchMin.
6 inch
Low Silhouette Ducted Type
4-Way Cassette Type
10 in.
10 in.
10 in.
3 ft. 3 ft.
3 ft. 3 ft.3 ft.
Min.8 ft.
Shows Low Silhouette Ducted Type only
Indoor Unit
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							1-76
1. Specifications
6.  HOW TO INSTALL THE INDOOR UNIT
4-Way Cassette Type
(U1 Type)
6-1. Suspending the Indoor Unit
This unit uses a drain pump. Use a level gauge to 
check that the unit is level.
6-2. Preparation for Suspending
(1)  Fix the suspension bolts securely in the ceiling 
using the method shown in the diagrams (Figs. 1-12 
and 1-13), by attaching them to the ceiling support 
structure, or by any other method that ensures that 
the unit will be securely and safely suspended.
(2)  Follow Fig. 1-13 and Table 1-4 to make the holes in 
the ceiling.
(3)  Determine the pitch of the suspension bolts using 
the supplied full-scale installation diagram. The 
diagram and table (Fig. 1-14 and Table 1-5) show the 
relationship between the positions of the suspen-
sion fitting, the unit, and the panel.
TypeLength 
Table 1-5Unit: inch (mm) 
S-26PU1U6
(CZ-24KPU1U)
S-36PU1U6, S-42PU1U6
(CZ-36KPU1U)
A
6-3/16
(157)
6-3/16
(157)7-5/32
(182)
7-5/32
(182)10-9/32
(261)
11-15/32
(291)12-1/8
(308)
13-1/16
(338)4-7/8
(124)
4-7/8
(124)
D E  B C 
Hole-in-anchor
Hole-in-plug
Concrete Insert
Suspension bolt (M10 or 3/8)
(field supply)
Fig. 1-12
)
g n
i n e p o g n i l i e C (
2 3 / 9 -
2 3Grille center
nsion bolt pitch) e p s u S ( 6 1 / 3 1 - 9 2
X
Refrigerant
tubing side  Drain hose
side B
(Suspension bolt pitch)
A (Ceiling opening)
Fig. 1-13
C
D
6 1
/ 3 -
1BAE
Suspension lugRefrigerant tubing joint (gas tube side)
Refrigerant tubing joint 
(liquid tube side)Drain connection (other side)
(VP25)
Length
Type
Table 1-4Unit: inch (mm)
S-26PU1U6
(CZ-24KPU1U)
S-36PU1U6, S-42PU1U6
(CZ-36KPU1U)
A
32-9/32
(820)
43-11/16
(1,110)22-9/32
(566)
33-11/16
(856)
B
Unit: inch
Fig. 1-14
Unit: inch
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							1-77
1. Specifications
6-3. Placing the Unit Inside the Ceiling
(1)  When placing the unit inside the ceiling, determine 
the pitch of the suspension bolts using the 
supplied full-scale installation diagram. (Fig. 1-15) 
The size of the opening for the indoor unit can be 
confirmed by attaching the full-scale installation 
diagram beneath the unit. (Fig. 1-15)
Tubing and wiring must be laid inside the ceiling 
when suspending the unit. If the ceiling is already 
constructed, lay the tubing and wiring into position 
for connection to the unit before placing the unit 
inside the ceiling.
(2)  The length of each suspension bolt must be 
appropriate for a distance between the bottom of 
the bolt and the bottom of the ceiling of 5/8 or 
more as shown in Fig. 1-15.
(3)  Thread the 2 hexagonal nuts (field supply) and 
washers onto the 4 suspension bolts as shown in 
Fig. 1-16.
Use 2 sets of nuts and washers (upper and lower), 
so that the unit will not fall off the suspension lugs.
(4)  Remove the protective cardboard used to protect 
the fan parts during transport.
(5)  Adjust the distance between the unit and surface 
of the ceiling. (1-7/8) (Fig. 1-15)
5/8 or more
8 / 7 - 1
Full-scale installation diagram 
(printed on a cardboard packing) 
Full-scale installation 
diagram
Fig. 1-15
Nuts and washers
Double nuts (Use above and below)Suspension bolt
Suspension lug
Upper
Lower
Notch
1-7/8
Fig. 1-16
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							1-78
1. Specifications
6-4. Installing the Drain Piping
(1)  Prepare standard hard PVC pipe for the drain and 
use the supplied drain hose and hose band to pre-
vent water leaks.
The PVC pipe must be purchased separately. The 
transparent part allows you to check drainage.
(Fig. 1-17)
(2)  After checking the drainage, wrap the supplied 
packing and drain pipe insulator around the pipe. 
(Fig. 1-18)
NOTE
Ensure the drain pipe has a downward gradient (1/100 
or more) and that there are no water traps.
CAUTION
Tighten the hose clamps so 
their locking nuts face upward. 
(Fig. 1-17)
CAUTION
Do not install an air bleeder tube, as this may 
cause water to spray from the drain tube outlet. 
(Fig. 1-19)
If it is necessary to increase the height of the 
drain pipe, the section directly after the connec-
tion port can be raised a maximum of 19-1/2.
Do not raise it any higher than 19-1/2, as this 
could result in water leaks. (Fig. 1-20)
Do not install the pipe with an upward gradient 
from the connection port. This will cause drain 
water to flow backwards and leak when the unit is 
stopped. (Fig. 1-21)
Do not apply force to the piping on the unit side 
when connecting the drain pipe. The pipe should 
not be allowed to hang unsupported from its 
connection to the unit. Fasten the pipe to a wall, 
frame, or other support as close to the unit as 
possible. (Fig. 1-22)
Provide insulation for any drain pipe that is run 
indoors.
Refer to “ 
 SUPPLEMENT ON DRAIN PIPING”.
Drain hose
(supplied) Packing
(supplied)Transparent part for 
checking drainageHose band
(supplied)Drain hose
adapter
(supplied)Hard PVC pipe
(not supplied)
Adhere with 
PVC adhesive.
Fig. 1-17
Drain insulator (supplied)
Fig. 1-18
Air bleeder
Fig. 1-19
11 or less (as short as possible)
19-1/2 or less
Fig. 1-20
Upward gradient prohibited
Fig. 1-21
Support
         pieces
Fig. 1-22
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							1-79
1. Specifications
6-5. Checking the Drainage
After wiring and piping are completed, use the follow-
ing procedure to check that the water will drain smooth-
ly. For this, prepare a bucket and wiping cloth to catch 
and wipe up spilled water.
(1)  Take off the tube cover and through the opening, 
slowly pour about 0.3 gal of water into the drain 
pan to check drainage.
(2)  Do Test Run to check the drainage after complet-
ing installation. When performing Test Run, refer to 
the installation instructions attached to the outdoor 
unit.
(3)  After drain checking is finished, return the Opera-
tion Selector switch to the RUN position (ON posi-
tion ) and remount the tube cover.
WARNING
Do not supply power to the 
unit until the tubing and wir-
ing to the outdoor unit are 
completed.
CAUTION
Be careful since the fan will 
start turning when checking 
the drainage.
WARNING
To mount the tube cover, 
use 5/16 (4 × 8 mm) tap-
ping screws. Do not use long 
screws as they may puncture 
the drain pan and cause water 
leakage.
5/16(4× 8 mm)
tapping screw
Tube cover
Siphon
Fig. 1-23
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							1-80
1. Specifications
Ceiling Panel
6-6. Before Installing the Ceiling Panel
(1)  Remove the air-intake grille and air filter from the 
ceiling panel. (Figs. 1-24 and 1-25)
(a)  Remove the 2 screws on the latch of the air-
intake grille. (Fig. 1-24)
(b)  Press on the 2 latches of the air-intake grille 
with your thumbs in the direction of the arrow 
to open the grille. (Fig. 1-24)
(c)  With the air-intake grille open about 45°, 
remove the safety cord (hook on the grille 
side). (Fig. 1-25)
(d)  Pull the air-intake grille towards you to remove 
it from the ceiling panel.
(2)  Pull down the two panel catches on the body of 
the indoor unit body. (Fig. 1-26)
CAUTION
Never touch or attempt to 
move the air direction louver 
by hand or you may dam-
age the unit. Instead, use the 
remote controller if you want 
to change the direction or air 
flow.
Ceiling panelAir-intake grille Latch
Screw
Safety cordAir filter
45°
Fig. 1-24
Fig. 1-25
Fig. 1-26
Ceiling panel
Screws M5 with washerPanel catch 
(arrange facing downwards) 
(2 locations)
(supplied) Ceiling panel wiring
connector
Air filter
Air-intake grille Panel catch Unit body
Electrical
component boxElectrical
component box
Clamp
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							1-81
1. Specifications
6-7. Installing the Ceiling Panel
(1)  Lift the ceiling panel and position it to align the 
panel hook with the panel catch of the indoor unit.
NOTE
The ceiling panel must be mounted in the correct 
direction. Note that the 2 catches of the panel differ in 
size. Confirm that the catches are correctly matched 
between the ceiling panel and the indoor unit body.
(2)  Next, check to see that the ceiling panel is prop-
erly aligned with the seamline of the ceiling. If it is 
not, remove the ceiling panel and slightly readjust 
the indoor unit body to the proper suspension 
point.
(3)  When the ceiling panel has been properly aligned, 
use the supplied 4 mounting screws (M5) with 
washers to permanently fasten the ceiling panel.
(4)  Install the wiring connector from the ceiling panel 
to the connector in the electrical component box of 
the indoor unit. After installing the connector, use 
the clamp on the body of the indoor unit to secure 
the wiring.
(5)  Install the air filter and air-intake grille by perform-
ing the steps in section 6-6 in reverse.
NOTE
Hook again the safety cord in its original position before 
closing the air-intake grille.
6-8. When Removing the Ceiling Panel for Servicing
When removing the ceiling panel for servicing, remove 
the air-intake grille and air filter, disconnect the wiring 
connector inside the electrical component box, and then 
remove the 4 mounting screws.
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							1-82
1. Specifications
6-9. Duct for Fresh Air
  There is a duct connection part on side of the indoor 
unit. (Fig. 1-27)
(1) Accessories
  Check that the following parts are in the box when 
unpacking.
(2) Installation
Fit the duct connection box into the rectangular hole of 
air-intake plenum with the accessory screws. 
(M4 × L1/2, 4 pcs)
(c) Installing the indoor unit
Install the indoor unit to the ceiling. 
(Install the indoor unit according to instructions enclosed 
with the outdoor unit.) Installation steps (a) to (d) are the same for both the 
CZ-26BCU1U and the CZ-42BCU1U. The drawing 
illustrates installation of air-intake plenum to the 
CZ-26BCU1U
(a) Installing the air-intake plenum
  Set the air-intake plenum to the indoor unit taking care 
not to set to the incorrect direction.
(b) Installing the duct connection box
Fasten the duct connection flange to the duct connection 
box with the accessory screws. (M4 × L1/2, 4 pcs)   Fasten the air-intake plenum with the supplied screws. 
(M5 × L4-7/8, 4 pcs)
CAUTION
When installing in a pre-
existing location, install the 
indoor unit before installing 
the duct connection box.
Air-intake plenum Type 
CZ-26BCU1UCZ-24KPU1U
(S-26PU1U6)
CZ-42BCU1UCZ-36KPU1U
(S-36PU1U6, S-42PU1U6)
Air-intake plenum (for fastening)
Duct connection flange/box (for fastening)
For fresh air intake
2-5/32
2-3/8
4-ø1/8 hole
ø4-13/32
Detail of fresh air intake
2P socket (Green) 3P socket (White) 2P socket (Green) 3P socket (White)
(ceiling panel side) Panel lead wire (3P, 2P)
(switch box side)
Fig. 1-27
Fig. 1-28
Unit: inch
Air-intake plenum (including Duct connection box and 
flange) are attached to the indoor unit when used to 
take fresh outdoor air.
NAMEQ’ ty
4REMARKS
8
1(for fresh air) Duct connection box
(for connecting fresh air duct)
1 Duct connection flange Screw (M5xL4-7/8”)
Screw (M4xL4-1/2”)
the air-intake plenum and fasten it to the side of the 
Clamper
Air-intake
plenum (M5 × L4-7/8, 4 pcs) Installation screws
Socket
cover
Indoor
unit
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							1-83
1. Specifications
(d) Installing the ceiling panel
Attach the ceiling panel to the air-intake plenum. 
Drawing the panel downwards sets the panel in position 
temporarily with the panel catch (at 2 locations).
Remove the socket cover of the air-intake plenum and pass 
the 8P sockets through it. 
(Fix the panel lead wire to air-intake plenum side clamper.)
Connect the 3P socket (white) and 2P socket (green) to the 
other side of the 3P socket (white) and 2P socket (green) 
respectively.
Reattach the socket cover.
Fig. 1-29
Duct connection box Duct connection flange
Panel catch (M4xL1/2”, 4pcs.) Installation screws
Ceiling panel
Please fix the socket cover located on the switch box 
after closing the lid for the switch box.
CAUTION
Take adequate precautions 
when installing onto the 
ceiling.
The air-intake plenum is 
especially prone to rupture 
if struck on its side.1
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							1-84
1. Specifications
Wall Mounted Type (K1 Type)
6-10. Removing the Wall Fixture from the Unit
Remove the set screws and take off the rear panel. 
(Fig. 1-30)
NOTE
Tubing can be extended in 3 directions as shown in 
Fig. 1-31. Select the direction that provides the shortest 
run to the outside unit.
6-11. Selecting and Making a Hole
(1)  Remove the rear panel from the indoor unit and 
place it on the wall at the location selected. Make 
sure the unit is horizontal using a level gauge or 
tape measure to measure down from the ceiling.
(2)  Determine which side of the unit you should make 
the hole. (Fig. 1-32)
(3)  Before making a hole, check carefully that no studs 
or pipes are directly run behind the spot to be cut.
CAUTIONAlso avoid areas where elec-
trical wiring or conduits are 
located.
The above precautions are also applicable if tubing 
goes through the wall in any other location.
(4)  Using a sabre saw, key hole saw or hole-cutting 
drill attachment, cut a hole in the wall. See Table 
1-6 and Fig. 1-33.
Table 1-6
(5)  Measure the thickness of the wall from the inside 
edge to the outside edge and cut PVC pipe at a 
slight angle 1/4 shorter than the thickness of the 
wall. (Fig. 1-34)
(6)  Place the plastic cover over the end of the pipe 
(for indoor side only) and insert in the wall. 
(Fig. 1-35)
Hole Dia. (inch)
3-3/16
Set screws for transportation only
Fig. 1-30
Right-rear
tubing
(recommended)
Right tubing Left-rear tubling
Fig. 1-31
Center of
left-rear
tubing holeCenter of
right-rear
tubing hole
In case of left-rear or right-rear tubing
Fig. 1-32
Indoor
sideOutdoorside
Fig. 1-33
PVC pipe (locally purchased)
Cut at slight angle
Fig. 1-34
Plastic cover
(Field supply)
OUTSIDE
INSIDE
Wall
Slight
anglePVC pipe
Fig. 1-35
NOTE
Hole should be made at a slight downward slant to 
the outdoor side.
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