HFC-410A CHARGING INFORMATION — FOR COMPLETE CHARGING DETAILS, REFER TO THE OUTDOOR UNIT INSTALLATION AND SERVICE PROCEDURE
Maintenance checks using the Normal Operating Pressures table
Table 2 may be used to help perform maintenance checks. This table is not a procedure for charg
ing the system and any minor variations in the pressures may be expected due to differences in
installations. However, significant deviations could mean that the system is not properly charged
or that a problem exists with some component in the system.
Charge Using the Subcooling Method
Cooling Mode
—When the outdoor ambient temperature is 60°F (15°C) and above, use the cool
ing mode to adjust the charge using the subcooling method. Target subcooling values in table
1 are based on 70 to 80°F (21-27°C) indoor return air temperature.
Heating Mode
—When the outdoor ambient temperature is below 60°F (15°C), use the heating
mode to adjust the charge using the subcooling charge levels (table ). Target subcooling values
in table 1 are based on 65-75°F (18-24°C) indoor return air temperature.
Matchups/Charge Levels and Line Set Lengths
Table 2 lists all the Lennox recommended indoor unit matchups along with the charge levels for
the various sizes of outdoor units.
Charge levels on the unit nameplate are based on installa
tions with 15' (4.6m) line sets; be sure to consider any difference in line set length (see
Installation Instructions for more details).
Charge Using the Weigh‐in Method
If the system is void of refrigerant, locate and repair any leaks and then weigh in the refrigerant
charge into the unit. For charge adjustments, be sure to consider line set length differences and,
referring to table 1, adjust for the matchup difference.
1 - Recover the refrigerant from the unit.
2 - Conduct leak check; evacuate as previously outlined.
3 - Weigh in the unit nameplate charge, adjusting for matchup and line set length differences.
If weighing facilities are not available use the Subcooling method.
Table 1 - Normal Operating Pressures (Liquid
+
10 and Suction
+
5 psig)
Heating Mode
Cooling Mode
ºF (ºC)*
20
30
40
50
60
65
70
75
80
85
90
95
100
105
110
115
SIZE
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
VAP/LIQ
-018
65/289
80/304
97/322
116/341
137/360
132/224
134/239
135/257
136/279
138/300
138/322
140/344
141/369
142/395
145/421
146/481
-024
58/281
72/295
88/ 309
105/324
123/340
139/243
140/262
142/281
143/302
144/325
145/348
145/373
146/399
147/426
147/454
148/483
-030
55/274
69/286
84/ 299
102/313
122/327
135/250
136/268
138/288
140/308
141/330
143/352
144/376
145/400
147/426
148/452
149/480
-036
62/287
76/304
91/ 322
106/342
124/365
135/230
137/248
139/268
141/288
143/311
145/334
146/359
148/385
150/412
151/441
153/471
-042
58/293
73/335
89/ 368
108/394
130/411
127/215
129/234
131/254
132/275
134/298
136/321
137/346
139/371
140/398
141/426
142/455
-048
60/282
75/299
90/ 316
105/334
121/353
136/219
137/237
138/256
139/277
140/298
141/321
142/344
143/369
144/395
146/422
147/450
-060
56/266
70/285
84/ 309
99/ 337
114/369
132/222
133/241
134/262
135/283
137/306
138/330
139/354
141/380
142/406
143/434
144/463
*Temperature of the air entering the outside coil.
Table 2 - Indoor Unit Matches and Subcooling Charge Levels and Additional Charge
HP
Size
Indoor Coil or Air
Handler
Subcool
Additional
Charge
HP
Size
Indoor Coil or Air
Handler
Subcool
Additional
Charge
HP
Size
Indoor Coil or Air
Handler
Subcool
Additional
Charge
Heat
(+5ºF)
Cool
(+1ºF)
Heat
(+5ºF)
Cool
(+1ºF)
Heat
(+5ºF)
Cool
(+1ºF)
lbs
oz
lbs
oz
lbs
oz
CBX25UH-018
CBX25UHV-018
13
3
0
0
CH33-36B
6
3
0
0
CH33-49C
16
6
1
6
-018
CBX27UH-018
8
9
1
2
-030
CH33-36C
10
11
1
5
CH33-50, -60C
10
9
3
4
CBX27UH-024
8
9
1
2
CH33-42B
16
18
2
6
-042
CH33-60D
12
8
0
9
CBX32MV-018/024
9
4
0
3
CH33-43C
4
9
1
12
CH33-62D
19
7
1
7
CH33-25A
10
6
0
9
CR33-30, -36
22
5
1
0
CR33-50, -60
29
5
0
4
CH33-25B
11
5
0
4
CX34-31
17
15
2
10
CR33-60D
29
5
0
4
CR33-30/36
18
5
0
9
CX34-36
25
6
0
10
CX34-49
11
6
1
4
CX34-25
8
4
0
9
CX34-38
10
19
2
14
CX34-50, -60
25
8
1
15
CX34-31
10
7
0
8
CX34-42
25
6
0
10
CX34-60
8
8
1
4
-024
CBX25UH-024
CBX25UHV-024
6
6
0
9
CX34-43
13
17
2
14
CX34-62C
8
11
3
10
CBX25UH-030
CBX25UHV-030
17
3
0
15
CX34-44, -48
9
21
2
12
CX34-62D
11
7
1
15
CBX26UH-024
17
3
0
15
-036
CBX25UH-036
CBX25UHV-036
31
3
0
4
-048
CBX25UH-048
CBX25UHV-048
15
6
2
5
CBX27UH-024
12
12
1
2
CBX26UH-036
31
3
0
4
CBX26UH-048
20
10
3
11
CBX27UH-030
11
11
2
1
CBX27UH-036
18
3
0
5
CBX27UH-048
16
6
0
0
CBX32M-018, -024
14
11
0
4
CBX27UH-042
11
4
0
1
CBX27UH-060
12
6
1
4
CBX32M-030
12
12
1
2
CBX27UH-048
11
4
0
1
CBX32M-048
16
6
0
0
CBX32MV-018/024
14
11
0
4
CBX32M-036
18
3
0
5
CBX32M-060
20
8
1
0
CBX32MV-024/030
12
12
1
2
CBX32M-042
18
3
0
5
CBX32MV-048
16
6
0
0
CBX32MV-036
11
11
2
1
CBX32MV-036
18
3
0
5
CBX32MV-060
20
8
1
0
CBX40UHV-024
11
11
2
1
CBX32MV-048
11
4
0
1
CBX32MV-068
10
8
4
5
CBX40UHV-030
11
11
2
1
CBX40UHV-042
11
4
0
1
CBX40UHV-048
16
6
0
0
CH23-41
10
3
0
0
CBX40UHV-048
11
4
0
1
CBX40UHV-060
20
8
1
0
CH33-25A
20
10
1
1
CBX40UHV-036
18
3
0
5
CH23-68
24
6
2
8
CH33-25B
19
8
1
2
CH33-43B
14
8
2
1
CH33-50, -60C
17
6
1
5
CH33-31A
15
11
1
15
CH33-43C
26
9
2
10
CH33-60D
18
6
0
13
CH33-36C
10
12
0
0
CH33-44/48B
24
8
2
3
CH33-62D
13
7
3
6
CH33-36A
20
10
1
1
CH33-48C
26
9
2
10
CR33-50/60
19
6
1
1
CR33-30, -036
17
4
0
14
CH33-49C
15
8
2
12
CR33-60
19
6
1
1
CX34-25
15
9
0
15
CH33-50/60C
15
8
2
12
CX34-49C
10
6
1
9
CX34-31
15
16
0
9
CR33-48
38
5
0
0
CX34-60
28
7
3
14
CX34-36
26
6
0
9
CR33-50, -60
15
5
1
4
CX34-62C
10
6
3
12
CX34-38
10
18
1
14
CX34-38
15
4
0
9
CX34-62D
14
7
3
12
-030
CBX25UH-030
CBX25UHV-030
9
3
0
8
CX34-43
23
8
2
8
-060
CBX25UH-060
CBX25UHV-060
15
6
2
0
CBX25UH-036
19
11
1
5
CX34-44/48
40
4
0
15
CBX26UH-060
31
6
3
0
CBX26UH-030
19
11
1
5
CX34-49
11
7
3
9
CBX27UH-060
13
7
0
8
CBX27UH-030
10
16
1
14
CX34-50/60
23
8
2
8
CBX32M-060
17
5
1
4
CBX27UH-036
10
16
1
14
-042
CBX25UH-042
CBX25UHV-042
42
5
0
8
CBX32MV-048
20
6
0
0
CBX32M-030
7
10
1
3
CBX26UH-042
42
5
0
8
CBX32MV-060
17
5
1
4
CBX32M-036
10
16
1
14
CBX27UH-042, -048
13
5
2
2
CBX32MV-068
11
8
2
12
CBX32MV-024/030
7
10
1
3
CBX32M-048
13
5
2
2
CBX40UHV-048
20
6
0
0
CBX32MV-036
10
16
1
14
CBX32MV-048
13
5
2
2
CBX40UHV-060
17
5
1
4
CBX40UHV-030
10
16
1
14
CBX40UHV-042
13
5
2
2
CH23-68
27
7
0
13
CBX40UHV-036
10
16
1
14
CBX40UHV-048
13
5
2
2
CH33-50, -60C
11
4
0
0
CH23-41
11
4
0
8
CH23-68
20
9
1
5
CH33-62D
19
6
2
4
CH23-51
11
6
0
14
CH33-43B
7
9
3
2
CR33-50/60
19
6
2
4
CH33-31A
16
18
2
8
CH33-43C
22
5
1
0
CR33-60
23
6
1
3
CH33-31B
16
18
2
6
CH33-44/48B
18
4
0
0
CX34-62C
10
7
2
14
CH33-36A
10
6
0
6
CH33-48C
22
5
1
0
CX34-62D
19
7
3
2
The values in this table are
most popular match-up
pressures; indoor match-up, indoor air quantity, and indoor load will cause the pressures to vary.
*Amount of charge required in addition to charge shown on unit
nameplate.