Page 9
10ACE SERIES
Charge Using Approach Method (TXV Systems)
− Outdoor Temperature >65°F (18°C)
The following procedure is intended as a general guide and
is for use on expansion valve (TXV) systems only. For best
results, indoor temperature should be 70°F (21°C) to 80°F
(26°C). Monitor system pressures while charging.
1. Record outdoor ambient temperature using a digital
thermometer.
2. Attach high pressure gauge set and operate unit for
several minutes to allow system pressures to stabilize.
3. Compare stabilized pressures with those provided in
table 7, Normal Operating Pressures."
IMPORTANT
Use table 7 to help perform maintenance checks.
Table 7 is not a procedure for charging the system.
Minor variations in these pressures may be due to
differences in installations. Significant deviations
could mean that the system is not properly charged
or that a problem exists with some component in the
system.
Pressures higher than those listed indicate that the
system is overcharged. Pressures lower than those
listed indicate that the system is undercharged.
Verify adjusted charge using the approach method.
NOTE − For best results, use the same digital ther-
mometer to check both outdoor ambient and liquid
temperatures.
4. Check the liquid line temperature. The difference be-
tween the ambient and liquid temperatures should
match values given in table 6. Loss of charge results
in low capacity and efficiency.
5. If the values do not agree with the those in table 6, add
refrigerant to lower the approach temperature, or re-
cover refrigerant from the system to increase the ap-
proach temperature.
Table 6
Approach Values
10ACE Model
−024
−036
−048
−060
Temp. °F (°C)
18 (10)
11 (6)
8 (4.5)
13 (7)
Approach Value is the Liquid Line Temperature minus Outdoor Ambi-
ent Temperature [ºF (ºC) +
1ºF (0.5ºC)]
Table 7
Normal Operating Pressures*
Temp
5
F
10ACE−024
10ACE−036
10ACE−048
10ACE−060
Temp
5
F
(
5
C)**
Liq.
Suc.
Liq.
Suc.
Liq.
Suc.
Liq.
Suc.
Expansion Valve
65 (18)
163
70
162
70
159
71
170
74
75 (24)
193
71
187
74
188
72
201
76
85 (29)
225
72
219
75
220
73
234
77
95 (35)
260
73
253
77
251
76
270
79
105 (41)
298
74
291
79
290
77
309
79
110 (43)
318
75
310
80
309
78
331
80
115 (45)
338
75
329
81
328
79
351
81
Fixed Orifice
65 (18)
165
63
168
67
163
68
189
72
75 (24)
194
67
195
71
190
71
203
74
85 (29)
224
70
224
75
220
74
233
77
95 (35)
257
73
255
78
251
77
265
79
105 (41)
293
76
289
82
288
79
301
82
110 (43)
313
78
305
83
307
80
319
83
115 (45)
332
79
324
84
325
82
339
84
*
Values shown are typical pressures (in. psig +2psig); indoor unit
match up, indoor air quality equipment, and indoor load will cause
the pressures to vary.
** Temperature of the air entering the outside coil.
Содержание 10ACE Series
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