Technical Changes - Mitsubishi Electric MUH-GA50VB-E1 Service Manual

Revision:A
• RoHS PARTS LIST has been added.
Revision:B
• MUH-GA50VB- has been added.
E2
1

TECHNICAL CHANGES

MUH-A18WV -
E1
1. Oil separator has been removed.
2. Model name has been changed.
Indication of capacity has been changed. (BTU kW)
MUH-A24WV -
E1
MUH-A30WV -
E1
1. Model name has been changed.
Indication of capacity has been changed. (BTU kW)
MUH-GA50VB -
E1
1. Outdoor heat exchanger has been changed. (1 row
2. Outdoor fan motor has been changed.
3. Oil separator has been added.
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.
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 Depletion Potential
w2 :Global Warming Potential
MUH-GA50VB -
E1
MUH-GA60VB -
E1
MUH-GA80VB -
E1
MUH-GA50VB -
E2
HFC-32: HFC-125 (50%:50%)
Pseudo-azeotropic refrigerant
: based on CFC-11
: based on CO
2
2 row)
New refrigerant
R410A
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
2
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