Page 10
Checking Charge Using Normal Operating Pressures
IMPORTANT
Use table 8 to help perform maintenance checks.
Table 8 is not a procedure for charging the system. Mi-
nor variations in these pressures may be due to differ-
ences in installations. Significant deviations could
mean that the system is not properly charged or that
a problem exists with some component in the system.
TABLE 7
Approach Values
13ACD Model
−018
−024
−030
−036
−042
−048
−060
Temp. °F (°C)
6 (3.3)
10 (5.6)
11 (6)
9 (5)
6 (3.3)
6 (3.3)
8 (4.4)
Approach Value is the Liquid Line Temperature minus Outdoor Ambient Temperature [ºF (ºC) +
1ºF (0.5ºC)]
NOTE − For best results, use the same digital thermometer to check both outdoor ambient and liquid temperatures.
TABLE 8
Normal Operating Pressures In psig (liquid and s/− 2 psig)*
Normal Operating Pressures
13ACD
Model
−018
−024
−030
−036
−042
−048−1, −2
units
−048
−060
Values below are typical pressures; indoor unit match up, indoor air quality equipment, and indoor load will cause the
pressures to vary.
*Temp.
5
F
(
5
C)
Liquid Line Pressure/Vapor Line Pressure
Expansion Valve (TXV)
65 (18)
141 / 80
147 / 79
141 / 76
145 / 74
143 / 78
145 / 80
140 / 77
151 / 76
70 (21)
154 / 81
159 / 79
154 / 76
157 / 75
153 / 79
157 / 81
152 / 77
164 / 77
75 (24)
166 / 81
173 / 80
167 / 77
170 / 76
167 / 80
170 / 81
165 / 77
177 / 78
80 (27)
180 / 82
187 / 81
181 / 78
186 / 76
182 / 80
184 / 82
179 / 78
192 / 78
85 (29)
195 / 82
218 / 82
195 / 78
201 / 77
198 / 81
198 / 82
192 / 78
207 / 79
90 (32)
209 / 83
202 / 81
210 / 79
217 / 77
215 / 81
214 / 83
209 / 80
223 / 80
95 (35)
222 / 83
234 / 82
227 / 80
234 / 78
231 / 82
230 / 84
227 / 81
240 / 80
100 (38)
244 / 84
251 / 83
249 / 81
251 / 79
249 / 83
247 / 84
243 / 81
259 / 81
105 (41)
258 / 85
267 / 84
260 / 81
268 / 79
268 / 84
265 / 85
261 / 82
277 / 81
110 (43)
276 / 85
287 / 84
278 / 82
288 / 80
287 / 84
283 / 85
279 / 83
297 / 82
115 (45)
294 / 86
307 / 85
299 / 83
309 / 81
308 / 85
303 / 86
296 / 83
318 / 83
Fixed Orifice (RFC)
65 (18)
144 / 73
147 / 68
140 / 66
150 / 67
147 / 70
145 / 70
143 / 73
150 / 67
70 (21)
157 / 76
160 / 71
152 / 68
162 / 70
158 / 72
156 / 72
154 / 75
163 / 70
75 (24)
167 / 78
173 / 74
166 / 71
176 / 72
171 / 75
170 / 75
167 / 78
177 / 72
80 (27)
182 / 80
189 / 77
180 / 74
190 / 74
184 / 77
183 / 78
180 / 79
191 / 75
85 (29)
196 / 82
203 / 79
196 / 76
205 / 76
198 / 78
198 / 80
193 / 81
207 / 77
90 (32)
211 / 84
219 / 81
211 / 79
220 / 78
213 / 80
213 / 82
207 / 82
221 / 79
95 (35)
225 / 84
238 / 83
227 / 80
237 / 79
228 / 81
230 / 84
221 / 84
239 / 80
100 (38)
242 / 86
255 / 85
294 / 82
255 / 80
245 / 82
246 / 85
237 / 85
256 / 81
105 (41)
256 / 86
272 / 86
262 / 83
273 / 81
262 / 84
264 / 86
253 / 86
274 / 83
110 (43)
278 / 88
294 / 87
282 / 84
291 / 83
281 / 84
282 / 87
269 / 87
295 / 84
115 (45)
293 / 88
317 / 88
302 / 86
314 / 84
300 / 85
301 / 88
289 / 88
315 / 85
*Temperature of the air entering the outside coil.
