Goodman GPH13 Service Instructions Manual page 37

SERVICING
1. Attach an accurate thermometer or preferably a thermo-
couple type temperature tester to the liquid line as it leaves
the condensing unit.
2. Install a high side pressure gauge on the high side service
valve.
3. Record the gauge pressure and the temperature of the line.
4. Convert the discharge pressure gauge reading to tempera-
ture by finding the gauge reading in Temperature - Pres-
sure Chart and reading to the left, find the temperature in
the °F. Column.
5. The difference between the thermometer reading and pres-
sure to temperature conversion is the amount of subcool-
ing.
EXAMPLE:
a. Discharge Pressure = 260
b. Corresponding Temp. °F. = 120°
c. Thermometer on Liquid line = 109°F.
To obtain the amount of subcooling subtract 109°F from 120°F.
The difference is 11° subcooling. The normal subcooling range
is 10° - 15°.
INDOOR
OUTDOOR
TEMP. °F
TEMP. °F
DB
115 75
105 75
95 75
85 75
75 75
65 75
Operating Pressures
LIQUID SUCTION
PRESSURE PRESSURE
PSIG PSIG
WB
63 301 - 332 73 - 83
67
306 - 335 77 - 78
71 82 - 92
311 - 342
63 268 - 299 72 - 82
67
273 - 304 77 - 87
71 278 - 309 80 - 90
63
233 - 264 67 - 77
67 72 - 82
238 - 269
71 243 - 274 77 - 87
63
198 - 229 62 - 72
67 203 - 234 67 - 77
71 208 - 239 71 - 81
63
172 - 203 57 - 67
67 61 - 71
175 - 206
71
180 - 211 66 - 76
63
144 - 175 52 - 62
67 149 - 180 56 - 66
71 155 - 186 60 - 70
Temp. Gauge Pressure
°F. (PSIG) Freon-22
-40 0.61
-38 1.42
-36 2.27
-34 3.15
-32 4.07
-30 5.02
-28 6.01
-26 7.03
-24 8.09
-22 9.18
-20 10.31
-18 11.48
-16 12.61
-14 13.94
-12 15.24
-10 16.59
-8 17.99
-6 19.44
-4 20.94
-2 22.49
0 24.09
2 25.73
4 27.44
6 29.21
8 31.04
10 32.93
12 34.88
14 36.89
16 38.96
18 41.09
20 43.28
22 45.53
24 47.85
26 50.24
28 52.70
30 55.23
32 57.83
34 60.51
36 63.27
38 66.11
40 69.02
42 71.99
44 75.04
46 78.18
48 81.40
50 84.70
52 88.10
54 91.5
56 95.1
58 98.8
TEMPERATURE-PRESSURE (R-22)
Temp. Gauge Pressure
°F. (PSIG) Freon-22
60 102.5
62 106.3
64 110.2
65 114.2
68 118.3
70 122.5
72 126.8
74 131.2
76 135.7
78 140.5
80 145.0
82 149.5
84 154.7
86 159.8
88 164.9
90 170.1
92 175.4
94 180.9
96 186.5
96 192.1
100 197.9
102 203.8
104 209.9
106 216.0
108 222.3
110 228.7
112 235.2
114 241.9
116 248.7
118 255.6
120 262.6
122 269.7
124 276.9
126 284.1
128 291.4
130 298.8
132 306.3
134 314.0
136 321.9
136 329.9
140 338.0
142 346.3
144 355.0
146 364.3
158 374.1
150 384.3
152 392.3
154 401.3
156 411.3
158 421.8
160 433.3
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