Lennox LGH094U Unit Information page 53

charge. Note that suction pressure can change as
charge is adjusted.
7- Example LGH/LCH150 Circuit 1: At 95°F outdoor am­
bient and a measured suction pressure of 130psig, the
65 °F
Suct Disc
(psig) (psig)
108 253
114 255
Circuit 1
119 257
125 264
108 273
115 277
Circuit 2
124 284
131 289
130
Circuit 1
Circuit 2
120
110
100
90
80
70
60
100 110
LGH/LCH150S Normal Operating Pressures - Fin/Tube - RFC
Outdoor Coil Entering Air Temperature
75 °F
Suct Disc Suct
(psig) (psig) (psig)
112 295 114
119 296 122
129 303 136
136 308 146
111 314 114
119 318 122
131 327 137
140 334 148
LGH/LCH150S Charging Curves - Fin/Tube - RFC
120
Suction Pressure (psig)
target liquid temperature is 96°F. For a measured liquid
temperature of 106°F, add charge in increments until
measured liquid temperature agrees with the target liq­
uid temperature.
TABLE 20
85 °F 95 °F
Disc Suct
(psig) (psig) (psig)
338 117
342 125
348 141
358 155
356 117
362 125
372 141
382 155
75°
65°
130 140
Page 53
105 °F
Disc Suct Disc
(psig) (psig)
384 119 438
390 127 444
403 145 460
413 161 470
400 119 451
409 128 460
422 145 474
434 160 486
Outdoor Temperature (°F)
95°
85°
150 160
115 °F
Suct Disc
(psig) (psig)
122 501
129 501
149 522
167 530
121 508
129 512
147 532
163 541
115°
105°
170