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TABLE 6
TEMPERATURE PRESSURE CHART
-25 [-31.6]
-20 [-28.8]
-15 [-26.1]
-10 [-23.3]
-5 [-20.5]
0 [-17.7]
5 [-15]
10 [-12.2]
15 [-9.4]
20 [-6.6]
25 [-3.8]
30 [-1.1]
35 [1.6]
40 [4.4]
45 [7.2]
50 [10]
TEMP
(Deg. F) [°C]
-150 [-101.1]
-140 [-95.5]
-130 [-90]
-120 [-84.4]
-110 [-78.8]
-100 [-73.3]
-90 [-67.7]
-80 [-62.2]
-70 [-56.6]
-60 [-51.1]
-50 [-45.5]
-40 [-40]
-35 [-37.2]
-30 [-34.4]
55 [12.7]
60 [15.5]
65 [18.3]
70 [21.1]
75 [23.3]
80 [26.6]
85 [29.4]
90 [32.2]
95 [35]
100 [37.7]
105 [40.5]
110 [43.3]
115 [46.1]
120 [48.8]
125 [51.6]
130 [54.4]
135 [57.2]
140 [60]
145 [62.7]
150 [65.5]
22.0 [151.7]
26.4 [182.0]
31.3 [215.8]
36.5 [251.6]
42.2 [290.9]
48.4 [333.7]
55.1 [379.9]
62.4 [430.2]
70.2 [484.0]
78.5 [541.2]
87.5 [603.3]
97.2 [670.2]
107.5 741.2]
118.5 [817.0]
130.2 [897.7]
142.7 [983.9]
R-410A
PSIG [kPa]
—
—
—
—
—
—
—
—
—
0.4 [2.7]
5.1 [35.1]
10.9 [75.1]
14.2 [97.9]
17.9 [123.4]
156.0 [107.6]
170.1 [1172.8]
185.1 [1276.2]
201.0 [1385.8]
217.8 [1501.7]
235.6 [1624.4]
254.5 [1754.7]
274.3 [1891.2]
295.3 [2036.0]
317.4 [2188.4]
340.6 [2348.3]
365.1 [2517.3]
390.9 [2695.2]
418.0 [2882.0]
446.5 [3078.5]
476.5 [3285.3]
508.0 [3502.5]
541.2 [3731.4]
576.0 [3971.4]
612.8 [4225.1]
16.5 SUBCOOLING CALCULATION
1. Measure the liquid pressure at the liquid line service valve.
2. Convert the liquid line pressure to saturated temperature. See Table 6.
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° in the cooling mode. Subcooling in the heating mode can vary widely from model to model and should never be used to determine the correct charge in the field.
TABLE 7
HEAT PUMP SYSTEM TROUBLESHOOTING TIPS
SYSTEM PROBLEM
Overcharge
Undercharge
Liquid Restriction (Drier)
Low Evaporator Airflow
Dirty Heat Pump
Low Outside Ambient Temperature
Inefficient Compressor
TEV Feeler Bulb Charge Lost
Poorly Insulated Sensing Bulb
HEAT PUMP SYSTEM
TROUBLESHOOTING TIPS
INDICATORS
DISCHARGE SUCTION
PRESSURE PRESSURE
High High
Low
Low
Low
High
Low
Low
Low
High
Low
Low
Low
High
Low
High
Low
High
SUPERHEAT SUBCOOLING
Low
High
High
Low
Low
High
High
High
Low
High
Low
High
Low
Low
High
High
High
Low
COMPRESSOR
AMPS
High
Low
Low
Low
High
Low
Low
Low
High
25
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