Service manual

TECHNICAL CHANGES
2
1
MU-18RV - ➔MU-A18WV -
1. Refrigerant has changed. (R22➔R410A)
2. Refrigerant system diagram has changed.
• Diameter of stop valve has changed. (Gas: [15.88➔[12.7)
• Accumulator has removed.
3. Oil separator has been added.
4. Compressor has changed. (PH33VPET➔RN196VHSHT)
MU-30RV - ➔MU-A30WV -
1. Outdoor model has changed.
2. Refrigerant has changed. (R22➔R410A)
3. Refrigerant system diagram has changed.
• Accumulator has removed.
4. Compressor has changed. (NH56VNHT➔NN37VAAHT)
E1E1
E1E1
Refrigerating
oil
Refrigerant
New refrigerant
R410A
HFC-32: HFC-125 (50%:50%)
Pseudo-azeotropic refrigerant
Not included
A1/A1
72.6
-51.4
1.557
64
Non combustible
0
1730
From liquid phase in cylinder
Possible
Incompatible oil
Non
Non
Previous refrigerant
R22
R22 (100%)
Single refrigerant
Included
A1
86.5
-40.8
0.94
44.4
Non combustible
0.055
1700
Gas phase
Possible
Compatible oil
Light yellow
Non
Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point (:)
Steam pressure [25:](Mpa)
Saturated steam density [25:](Kg/K)
Combustibility
ODP w1
GWP w2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
w1:Ozone Destruction Parameter : based on CFC-11
w2 :Global Warmth Parameter : based on CO
2
INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT
• This room air conditioner adopts an HFC refrigerant (R410A) which never destroys the ozone layer.
• Pay particular attention to the following points, though the basic installation procedure is same as that for R22 conditioners.
1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/
materials are required. Refer to the table below.
2 Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and
installation, since it is more susceptible to contaminations than R22.
3 For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
4 Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
Revision A:
•Resistance of LEV (Expansion valve) has been modified. (30.3 " ~ 37.0 "➔41.0 " ~ 49.0 ")
TROUBLESHOOTING has been partially modified.
•Running current, power input and power factor have been added.
SPECIFICATION has been partially modified.
MU-24RV - ➔MU-A24WV -
1. Refrigerant has changed. (R22➔R410A)
2. Refrigerant system diagram has changed.
• Diameter of stop valve has changed.
(Liquid: [9.52➔[6.35)
3. Compressor has changed. (NH47VMDT➔NN29VBAHT)
E1E1
OB326A-1.qxp 04.2.9 10:41 AM Page 2