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R410A Temperature/Pressure Chart
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F °
P
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F °
P
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F °
P
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g i
3
2
1
0
0
8 .
7
4
2
1
4
0 .
1
1
6
3
9
6
0 .
3
3
1
0
2
9 .
7
5
2
1
7
4 .
1
1
7
4
0
1
3 .
3
4
1
0
5
0 .
7
6
2
2
0
9 .
1
1
8
4
0
6
7 .
3
5
1
0
7
1 .
7
7
2
2
4
4 .
1
1
9
4
1
2
2 .
3
6
1
0
9
2 .
7
8
2
2
8
0 .
1
2
0
4
1
7
7 .
3
7
1
1
1
4 .
7
9
2
3
1
6 .
1
2
1
4
2
3
2 .
3
8
1
1
3
6 .
8
0
2
3
5
3 .
1
2
2
4
2
8
8 .
3
9
1
1
5
8 .
8
1
2
3
9
0 .
1
2
3
4
3
4
5 .
4
0
1
1
8
0 .
8
2
2
4
2
7 .
1
2
4
4
4
0
2 .
4
1
1
2
0
3 .
8
3
2
4
6
5 .
1
2
5
4
4
5
9 .
4
2
1
2
2
6 .
8
4
2
5
0
3 .
1
2
6
4
5
1
8 .
4
3
1
2
5
0 .
8
5
2
5
4
1 .
1
2
7
4
5
7
6 .
4
4
1
2
7
3 .
8
6
2
5
8
0 .
1
2
8
4
6
3
5 .
4
5
1
2
9
7 .
8
7
2
6
2
0 .
1
2
9
4
6
9
5 .
4
6
1
3
2
2 .
8
8
2
6
6
0 .
1
3
0
4
7
5
6 .
4
7
1
3
4
6 .
8
9
2
7
0
0 .
1
3
1
4
8
1
6 .
4
8
1
3
7
1 .
9
0
2
7
4
1 .
1
3
2
4
8
7
8 .
4
9
1
3
9
6 .
9
1
2
7
8
2 .
1
3
3
4
9
4
0 .
5
0
1
4
2
2 .
9
2
2
8
2
3 .
1
3
4
5
0
0
2 .
5
1
1
4
4
8 .
9
3
2
8
6
5 .
1
3
5
5
0
6
5 .
5
2
1
4
7
4 .
9
4
2
9
0
8 .
1
3
6
5
1
2
9 .
1
3
7
5
1
9
3 .
5
3
1
5
0
1 .
9
5
2
9
5
1 .
1
3
8
5
2
5
8 .
5
4
1
5
2
8 .
9
6
2
9
9
4 .
1
3
9
5
3
2
4 .
5
5
1
5
5
5 .
9
7
3
0
3
8 .
1
4
0
5
3
9
0 .
5
6
1
5
8
2 .
9
8
3
0
8
2 .
1
4
1
5
4
5
6 .
5
7
1
6
1
0 .
9
9
3
1
2
7 .
1
4
2
5
5
2
3 .
5
8
1
6
3
9 .
1
0
0
3
1
7
2 .
1
4
3
5
5
9
1 .
5
9
1
6
6
7 .
1
0
1
3
2
1
8 .
1
4
4
5
6
5
9 .
6
0
1
6
9
6 .
1
0
2
3
2
6
4 .
1
4
5
5
7
2
8 .
6
1
1
7
2
6 .
1
0
3
3
3
1
0 .
1
4
6
5
7
9
8 .
6
2
1
7
5
5 .
1
0
4
3
3
5
7 .
1
4
7
5
8
6
8 .
6
3
1
7
8
5 .
1
0
5
3
4
0
5 .
1
4
8
5
9
3
8 .
6
4
1
8
1
6 .
1
0
6
3
4
5
3 .
1
4
9
6
0
1
0 .
6
5
1
8
4
3 .
1
0
7
3
5
0
1 .
1
5
0
6
0
8
1 .
6
6
1
8
7
7 .
1
0
8
3
5
5
0 .
1
5
1
6
1
5
4 .
6
7
1
9
0
9 .
1
0
9
3
6
0
0 .
1
5
2
6
2
2
7 .
6
8
1
9
4
1 .
1
1
0
3
6
5
0 .
1
5
3
6
3
0
1 .
6
9
1
9
7
3 .
1
1
1
3
7
0
0 .
1
5
4
6
3
7
5 .
7
0
2
0
0
6 .
1
1
2
3
7
5
1 .
1
5
5
6
4
5
0 .
7
1
2
0
3
9 .
1
1
3
3
8
0
2 .
7
2
2
0
7
2 .
1
1
4
3
8
5
4 .
7
3
2
1
0
6 .
1
1
5
3
9
0
7 .
Table 6
_____ °
Saturation Temperature °F
–
_____ °
Liquid Line Temperature °F
=
_____ °
Subcooling Value °F
4. Subtract the liquid line temperature from the saturation
temperature (according to the chart) to determine
subcooling.
5. Compare the subcooling value with those shown in Table
7. If subcooling is greater than shown, recover some
refrigerant. If subcooling is less than shown, add some
refrigerant.
Subcooling Values for
Fixed Orifice or TXV Systems
4SCU13 MODELS
Table 7
Charge Using Superheat Method (Fixed Orifice Systems) –
Outdoor Temperatures 65°F or above
1. With the manifold gauge hose on the suction service
port and the unit operating stably, use a digital
thermometer to record the suction line temperature.
2. At the same time, record the suction line pressure
reading.
3. Use the temperature/pressure chart (Table 6 on page 13) to
determine the saturation temperature for the suction line
pressure reading.
4. Subtract the saturation temperature (according to the
chart) from the suction line temperature to determine
the superheat.
_____ °
Suction Line Temperature °F
–
_____ °
Saturation Temperature °F
=
_____ °
Superheat Value °F
Page 14
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