System information

28 18-BC53D2-6
STEP 4 - Use the measured values from Step 3
to determine a target superheat of 15 degrees.
Example: Assume a suction pressure of 81
PSIG and a suction temperature of 36º F.
When the suction temperature is in line with
the suction gage pressure, the target superheat
value will be 15 degrees. (Example values high-
lighted in Table 13.2)
Table 13.2
STEP 5 - Adjust refrigerant level to attain 15
degrees of superheat.
Add refrigerant if the suction line temperature
is above the value that is in line with the mea-
sured suction gage pressure.
1. Connect gages as shown in Step 3.
2. Purge all hoses.
3. Open bottle.
4. Stop adding refrigerant when the suc-
tion line temperature is in line with the
measured suction line pressure in Table
13.2.
Recover refrigerant if the suction line tempera-
ture is lower than the temperature that is in line
with the system’s suction pressure.
Suction Line
Temp
Suction Gage
Pressure
10
42
12
44
14
47
16
50
18
52
20
55
22
58
24
61
26
64
28
67
30
70
32
74
34
77
36
81
38
84
40
88
42
92
44
96
46
100
48
104
50
108
52
112
54
117
56
121
58
126
60
131
62
136
64
141
70
157
15 degree Superheat Chart