Mitsubishi R410A SERVICE MANUAL

SERVICE MANUAL

HFC

utilized

R410A

R410A REFRIGERANT

No. OBR01

CONTENTS

1. INFORMATION FOR THE AIR CONDITIONER
WITH R410A REFRIGERANT ···························2

2. TOOLS DEDICATED FOR THE AIR
CONDITIONER WITH R410A REFRIGERANT ·3

3. REFRIGERANT PIPING·····································3

4. REFRIGERANT OIL ·····················BACK COVER

5. ADDITIONAL CHARGE ···············BACK COVER

NOTE:

This service manual describes treatment of the air conditioner with R410A refrigerant.

New Specification Current Specification

The incompatible refrigeration oil easily separates from
refrigerant and is in the upper layer inside the suction muffler.
Raising position of the oil back hole enables to back the
refrigeration oil of the upper layer to flow back to the
compressor.

Since refrigerant and refrigeration oil are compatible each,
refrigeration oil goes back to the compressor through the
lower position oil back hole.

Compressor

Suction muffler

Oil back hole

refrigeration oil

Refrigerant

Compressor

Suction muffler

Oil back hole

refrigeration oil /Refrigerant

Compressor

Refrigeration

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

1. INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT

-30 -20 -10 0 10 203040 50 60

-0.5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

(MPa [Gauge])

R410A
R22

Conversion chart of refrigerant temperature and pressure

Saturated liquid pressure

(:)

• This room air conditioner adopts 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 air
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 R410Arefrigerant 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 3. REFRIGERANT PIPING.)

4 Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent

composition change.

NOTE : The unit of pressure has been changed to MPa on the

international system of units(SI unit system).

The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/

2

ff

[Gauge])