Panasonic Cs Kexxnb4x Cz 18bt1u Service Manual

Fuse
PCB Ass'y
Fig. 5
Fig. 6
Fuse
10-2.  Checking Continuity of Fuse 
on PCB Ass'y
Remove the PCB Ass'y from the electrical 
component box. Then pull out the fuse from the PCB 
Ass'y. (Fig. 5)
Check for continuity using a multimeter as shown in 
Fig. 6.
61 

11.  REFRIGERANT R410A: 
SPECIAL PRECAUTIONS WHEN SERVICING UNIT
11-1.  Characteristics of New Refrigerant R410A
11-1-1.  What is New Refrigerant R410A?
R410A is a new refrigerant that contains two types of pseudo-non-azeotropic refrigerant mixture. Its 
refrigeration capacity and energy efficiency are about the same level as the conventional refrigerant, R22.
11-1-2.  Components (mixing proportions)
HFC32 (50%) / HFC125 (50%)
11-1-3.  Characteristics
Less toxic, more chemically stable refrigerant
The...

Tubing precautions
Refrigerant R410A is more easily affected by dust or moisture compared with R22, thus be sure to temporarily 
cover the ends of the tubing with caps or tape prior to installation.
Never use 0.0276" (0.7 mm)-thick copper tubing or tubing which is less than 0.0315" (0.8 mm) in thickness, since 
air conditioners with R410A are subject to higher pressure than those using R22 and R407C.
No addition of compressor oil for R410A
No additional charge of compressor oil is permitted.
No...

11-3.  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...

11-5.  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 "11-3. Tools Specifically 
for R410A."
11-5-1.  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
11-6.  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...

11-7.  Charging Additional Refrigerant
11-7-1.  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. 
11-8.  Retro-Fitting Existing Systems
11-8-1.  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.
11-8-2.  Use of...