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TABLE 9
TEMPERATURE PRESSURE CHART
TEMP
R-410A
(Deg. F)
PSIG
-150
—
-140
—
-130
—
-120
—
-110
—
-100
—
-90
—
-80
—
-70
—
-60
0.4
-50
5.1
-40
10.9
-35
14.2
-30
17.9
-25
22.0
-20
26.4
-15
31.3
-10
36.5
-5
42.2
0
48.4
5
55.1
10
62.4
15
70.2
20
78.5
25
87.5
30
97.2
35
107.5
40
118.5
45
130.2
50
142.7
55
156.0
60
170.1
65
185.1
70
201.0
75
217.8
80
235.6
85
254.5
90
274.3
95
295.3
100
317.4
105
340.6
110
365.1
115
390.9
120
418.0
125
446.5
130
476.5
135
508.0
140
541.2
145
576.0
150
612.8
SUPERHEAT CALCULATION
1. Measure the suction pressure at the suction line service valve.
2. Convert the suction pressure to saturated temperature. See Table 9.
3. Measure the temperature of the suction line at the suction line service valve.
4. Compare the temperature of the suction line to the saturated temperature.
5. The difference between saturated temperature and suctin line temperature is the
superheat. Superheat normal range 12° to 15°.
SUBCOOLING CALCULATION
1. Measure the liquid pressure at the liquid line service valve.
2. Convert the liquid line pressure to saturated temperature. See Table 10.
3. Measure the liquid line temperature at the liquid line service valve.
4. Compare the liquid line temperature to the saturated temperature.
5. The difference between saturated temperature and liquid line temperature is the
subcooling. Subcooling normal range 9° to 12°.
TABLE 10
AIR CONDITIONING SYSTEM TROUBLESHOOTING TIPS
SYSTEM PROBLEM
Overcharge
Undercharge
Liquid Restriction (Drier)
Low Evaporator Airflow
Dirty Condenser
Low Outside Ambient Temperature
Inefficient Compressor
TEV Feeler Bulb Charge Lost
Poorly Insulated Sensing Bulb
AIR CONDITIONING SYSTEM
TROUBLESHOOTING TIPS
INDICATORS
DISCHARGE
SUCTION
SUPERHEAT SUBCOOLING
PRESSURE PRESSURE
High
High
Low
Low
Low
High
Low
Low
High
Low
Low
Low
High
High
Low
Low
Low
High
Low
High
High
Low
Low
High
High
High
Low
COMPRESSOR
AMPS
High
High
Low
Low
High
Low
Low
Low
Low
High
High
Low
High
Low
High
Low
Low
High
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