Panasonic Cu 3ks19nbucu 4ksxxnbu Technical Service Manual

9-3.  Tools Specifically for R410A 
For servicing, use the following tools for R410A
Gauge manifold
Charging hose
Gas leak detector
Refrigerant cylinder
Charging cylinder
Refrigerant recovery unit
Vacuum pump with anti-reverse flow (*1)
(Solenoid valve-installed type, which prevents oil from flowing back into the 
unit when the power is off, is recommended.)
Vacuum pump (*2)...can be used if the following adapter is attached.
Vacuum pump adapter (reverse-flow prevention adapter) (*3).
(Solenoid...

9-5.  In Case of Compressor Malfunction 
CAUTIONShould the compressor malfunction, be sure to make the switch to a replacement 
compressor as quickly as possible.
Use only the tools indicated exclusively for R410A.     See "9-3. Tools Specifically 
for R410A."
9-5-1.  Procedure for Replacing Compressor
(1) Recovering refrigerant
Any remaining refrigerant inside the unit should not be 
released to the atmosphere, but recovered using the 
refrigerant recovery unit for R410A. 
Do not reuse the...

Valve
Single valve
Charge liquid refrigerant with 
cylinder in up-side-down position.
Single valve (with siphon tube)
Charge with cylinder in normal position.Liquid
Valve
Liquid
Charging
cylinder
Open
Refrigerant
cylinder
Liquid
NO!
CAUTIONNever charge a large amount 
of liquid refrigerant at once to 
the unit. This may cause 
damage to the compressor.
CAUTIONTo prevent the composition 
of R410A from changing, 
never bleed the refrigerant 
gas into the atmosphere 
while transferring the 
refrigerant....

Length of tubing
Evacuation timeLess than 33 ft. (10 m)
More than 10 minutesMore than  33 ft. (10 m)
More than 15 minutes
9-6.  In Case Refrigerant is Leaking
CAUTIONNever attempt to charge additional refrigerant when refrigerant has been leaking 
from the unit. Follow the procedure described below to locate points of leaks and 
carry out repairs, then recharge the refrigerant.
(1) Detecting Leaks
Use the detector for R410A to locate refrigerant leak 
points. 
(2) Recovering refrigerant
Never release the...

9-7.  Charging Additional Refrigerant
9-7-1.  When Tubes are Extended
Observe the proper amount of refrigerant as stated in this service manual or the installation manual that came 
with the indoor unit. Charge additional refrigerant in liquid state only. 
9-8.  Retro-Fitting Existing Systems
9-8-1.  Use of Existing Units
Never use new refrigerant R410A for existing units which use R22. This will cause the air conditioner to 
operate improperly and may result in a hazardous condition.
9-8-2.  Use of...

INSTALLATION INSTRUCTIONS
CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU
(852-6-4190-581-00-1)
APPENDIX A
A-1 

For Outdoor Unit
This air conditioner uses the refrigerant R410A. 
External diameter of service port R410A: 5/16" 
Split System Air Conditioner 
85264190581001 2011 CV6233187761
INSTALLATION INSTRUCTIONS 
NOTE
Contents
Page
IMPORTANT!
Please Read Before Starting..................................2
1. GENERAL..........................................................4
1-1. Tools Required for Installation (not supplied)
1-2. Accessories Supplied with Unit
1-3. Optional Copper Tubing Kit
1-4. Type of...

IMPORTANT! 
Please Read Before Starting
This air conditioning system meets strict safety and operating
standards. As the installer or service person, it is an important
part of your job to install or service the system so it operates
safely and efficiently. 
For safe installation and trouble-free operation, you
must:

Carefully read this instruction booklet before beginning.

Follow each installation or repair step exactly as shown.

Observe all local, state, and national electrical codes.

Pay close...

4
1-2.  Accessories Supplied with Unit 
Table 1
1-3.  Optional Copper Tubing Kit
Copper tubing for connecting the outdoor unit to the
indoor unit is available in kits which contain the narrow
and wide tubing, fittings and insulation. Consult your
nearest sales outlet or air conditioning workshop.
1-4.  Type of Copper Tube and Insulation Material
If you wish to purchase these materials separately from
a local source, you will need:
1. Deoxidized annealed copper tube for refrigerant tub-
ing as detailed in...