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SiE33-003
Refrigerant and Refrigerant Oil Characteristics
New Refrigerant R-407C
173
3.2
Refrigerant Oil Characteristics
Main characteristics of ether oil are shown in the following table.
1 : Applicability may differ in products of other manufacturers.
Moisture
Absorption
The graph on the below shows how the moisture absorption (moisture level) changes over time in suniso,
ester oil and ether oil.
Solubility in
Refrigerant
The graph on the below shows the oil solubility of different combination of refrigerant and chiller oil.
→
A combination of suniso and HFC refrigerant results in a separation of refrigerant and oil in almost the
entire range. (No solubility)
→
A combination ether oil and HFC refrigerant remains dissolved in a wide range.
Synthetic oil
Mineral oil
Ether oil
Type (maker)
FVC68D
(Idemitsu Kosan)
Suniso 4GS
(NIppon Sun Oil)
Applicable refrigerants (Daikin
products)
1
R-407C
R22
Density (g/cm
³
)
0.94
0.92
Total acid number
(mgKOH/g)
0.01
0.01
Saturated moisture level (ppm)
2000
100
Volume insulation resistivity (
Ω
cm)
3
×
10
13
or less
5
×
10
14
or less
Hydrolysis
(stability range)
No degradation
No degradation
Oxidation degradation
(stability range)
0.03% or less
0.03% or less
Moisture absorption
(As shown in graph below)
(As shown in graph below)
Solubility in refrigerant
(As shown in graph below)
(As shown in graph below)
Moisture le
vel (ppm)
2000
1000
50
0
100
200
Time (hr)
Ether oil
Ester oil
Mineral oil
Temperature
Humidity
Oil quantity
100cc Beaker
: 25˚C
: 45%
: 50cc
(V1108)
50
40
30
20
10
0
10
20
30
40
50
0
10
20
30
40
50
60
70
80
90
90
100
80
70
60
50
40
30
20
10
0
100
T
emper
ature of refr
iger
ant and oil separ
ation (
˚C)
Oil content (wt%)
Refrigerant content(wt%)
Separated
Separated
Separated
Separated
Separated
Dissolved
Dissolved
Dissolved
Dissolved
Dissolved
Ether oil and R410A
Ether oil and R410A
Suniso 4GS
and R-407C/R410A
Suniso 4GS
and R-407C/R410A
Suniso 4GS and R22
Ether oil and R-407C
(soluble in entire range)
(V1109)
Si33-003.book Page 173 Monday, June 25, 2001 9:06 AM
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