— 9 —
FINAL CHARGE ADJUSTMENT
Caution! Do not ovrcharge unit with refrigerant. Overcharged unit may result in compressor
damage or personal injury.
For Piston (Orifice) Metering:
Look up proper superheat for given outdoor air temperature and return air temperature (Table 7).
If actual superheat is above the proper superheat amount, more refrigerant must be added.
If actual superheat is below the proper superheat amount, remove small quantity of refrigerant.
For TXV:
Look up proper subcooling level for TXV listed on rating plate.
If actual subcooling is below the proper subcooling by more than 2˚F, refrigerant must be added.
If actual subcooling is greater than the proper subcooling by more than 2˚F, remove small quantity of
refrigerant.
Saturated Suction Temperature (R-22)
Suction Pressure
Saturated Suction
(PSIG)
Temperature (˚F)
60.1
34
62.8
36
65.6
38
68.5
40
71.4
42
74.5
44
77.6
46
80.7
48
84
50
87.3
52
90.8
54
94.3
56
Table 5
Saturated Suction Temperature (R-22)
Suction Pressure
Saturated Suction
(PSIG)
Temperature (˚F)
195.9
102
210.7
105
220
108
229.5
111
239.3
114
249.4
117
259.8
120
270.5
123
281.6
126
289.1
128
300.6
131
308.5
134
Table 6
System Superheat
Return Air Temperature (˚F, DB)
Table 7
65
70
75
80
85
105
-
-
-
2
4
100
-
-
-
5
8
95
-
-
4
10
13
90
-
-
7
14
18
85
-
-
10
17
22
80
-
6
14
21
26
75
-
10
18
25
29
70
7
14
22
29
32
65
13
19
26
32
35
60
17
25
30
34
37
Outdoor Temperature (˚F)
