Subcooling Calculation - Reelin PNE 13 Seer Installation Instructions Manual

TABLE 11
TEMPERATURE PRESSURE CHART
TEMP
(Deg. F)
-150
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60 101.6
65 111.3
70 121.4
75 132.2
80 143.7
85 155.7
90 168.4
95 181.8
100 196.0
105 210.8
110 226.4
115 242.8
120 260.0
125 278.1
130 297.0
135 316.7
140 337.4
145 359.1
150 381.7
24

15.5 SUBCOOLING CALCULATION

1. Measure the liquid pressure at the liquid line service valve.
R-22
2. Convert the liquid line pressure to saturated temperature. See Table 11.
PSIG
3. Measure the liquid line temperature at the liquid line service valve.
*29.4
4. Compare the liquid line temperature to the saturated temperature.
*29.1
5. The difference between saturated temperature and liquid line temperature is the
*28.5
subcooling. Subcooling normal range 9° to 12°.
*27.7
*26.6
*25.1
*23.0
*20.2
16.6
*11.9
*6.1
0.6
2.6
4.9
TABLE 12
7.5
HEAT PUMP SYSTEM TROUBLESHOOTING TIPS
10.2
13.2
16.5
SYSTEM PROBLEM
20.1
24.0
28.3
32.8
Liquid Restriction (Drier)
37.8
Low Evaporator Airflow
43.1
48.8
Low Outside Ambient Temperature
54.9
Inefficient Compressor
61.5
TEV Feeler Bulb Charge Lost
Poorly Insulated Sensing Bulb
68.5
76.1
84.1
92.6
HEAT PUMP SYSTEM
TROUBLESHOOTING TIPS
DISCHARGE
PRESSURE PRESSURE
Overcharge High
Undercharge Low
Low
Low
Dirty Heat Pump High
Low
Low
Low
High
INDICATORS
SUCTION
SUPERHEAT SUBCOOLING
High Low High
Low High Low
Low High High
Low Low Low
High Low Low
Low High High
High High High
Low High High
High Low Low
COMPRESSOR
AMPS
High
Low
Low
Low
High
Low
Low
Low
High