Panasonic Cu 3ks19nbucu 4ksxxnbu Technical Service Manual

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Indoor unit B Indoor unit A
Ground Power:
Single-phase,
230/208VAC 60HZ
Power breaker
(not provided)
Outdoor unit 
Terminal board
Label A
Inter-unit cables
#14 (not provided)  Terminal board
Inter-unit cables
#14 (not provided) 
Terminal board
Label B
Label C
Inter-unit cables
#14 (not provided) Inter-unit cables
#14 (not provided)Terminal board
Terminal board
Label D
A
BC
D
Power cable (not provided) 
(#12: Less than 85 ft.)
Be sure to perform grounding.
Attach a ground wire to either the
outdoor unit or indoor unit.
If there is a grounding terminal
inside the room, use the grounding
screw inside the indoor unit.Be sure to apply the provided labels to both
ends of the inter-unit cables to prevent mis-
wiring. The units will not function if the wiring
connections are incorrect.
 A  is the indoor unit with 
refrigerant tubing that is 
connected to service valve 
A (bottom) of the outdoor unit.
refrigerant tubing that is 
connected to service valve B 
(second from the bottom) of 
the outdoor unit.  B  is the indoor unit with 
Indoor unit C
refrigerant tubing that is 
connected to service valve 
C (third from the bottom) 
of the outdoor unit. C  is the indoor unit with 
Indoor unit D
refrigerant tubing that is 
connected to service valve 
D (top) of the outdoor unit. D  is the indoor unit with 
1     2
1   2   3   4   5   6   7   8   9  10 11 12
Power supply
(conduit)
Inter Unit
(conduit)Inter Unit
(conduit)
# ... AWG (American Wire Gauge)
5-5.  Wiring Instructions for the Outdoor Unit

Be sure to correctly align inter-unit cables A, B, C and D.

Use a dedicated air conditioner circuit for power.

To make connections to the outdoor unit, remove the inspection panel and tubing panel.

Do not bring the inter-unit cables or power cable into contact with tubing or service valves.

Use outdoor unit cable fasteners and fasten the inter-unit cables at the location where the cables are double-
sheathed.

Arrange the wiring so that the inter-unit cables are contained in the inspection panel and tubing panel, as shown in
Fig. 31.
CAUTION
Fig. 31 
						

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Regulations on wire size differ from locality to locality. For
field wiring requirements, please refer to your local electri-
cal codes. Make sure that the installation fully complies
with all local and national regulations.
(1) Remove access panel “C”. (Fig. 32)
(2) Connect the inter-unit and power supply line accord-
ing to the drawing on the panel side.
(3) Be sure to size each wire allowing approx. 4 
(10 cm) longer than the required length for wiring.
Store excess wiring inside the cabinet.
(4) When connections are completed, check that all con-
nections are correct as shown in the wiring system
diagram on panel side.
(5) Be sure to ground the unit according to your local
codes.
Fig. 32
Lock nut
Conduit
plate
Plug
Inter unit
(Conduit)Power supply
(Conduit) Cabinet
Terminal
block
Access panel “C”
Fig. 33
Conduit plate
Make sure there is no gap between 
access panel “C” and the conduit plate.
Access panel  C
CAUTION
6.  Test Run
Performing a test run

Refer to the test run procedures in the indoor unit
installation manual.

Perform the test run separately for each connected
indoor unit. If 2 units are operated simultaneously, it is
not possible to correctly check for errors in tubing and
wiring.
Checking tubing and wiring
Perform the test run and check that operation is normal. If
there is an error in tubing or wiring, the refrigerant may
flow to indoor unit B when indoor unit A is operated (for
example).

Stop operation immediately if there is an error in tubing
or wiring. Turn the power (breaker) to OFF, and check
whether the inter-unit cables are connected incorrectly,
or whether the narrow tubes A and B are connected in
reverse. Correct the connections.

If there is an error in tubing, pump-down must be per-
formed. Be sure to perform pump-down. After making
corrections, again purge the air from the tubes.
CAUTION 
						

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7.  Connecting a Home Automation Device
The HA (white) 4P terminal is located on the indoor unit PCB. If a HA device will be used, 
connect it to this terminal.
8.  Installation Check Sheet
The strength of the installation location is sufficient to support the air conditioner weight.
The indoor and outdoor units are installed level and vertically.
The power and voltage are as specified.
Inter-unit cables are securely fastened to the terminal board.
Inter-unit cables are securely fixed.
The power cable and inter-unit cables are not connected anywhere along their paths.
The ground wire is securely connected.
An air purge of the refrigerant circuit has been conducted.
A leak test of the tubing connections has been performed.
Thermal insulation has been applied to the tubing connections.
Drain connections are secure and water drains properly.
Putty has been used to close the hole in the wall.
All service valves are fully open.
Remote controller signals are being positively received. 
						

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