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FOR COMPLETE CHARGING DETAILS, REFER TO THE OUTDOOR UNIT INSTALLATION AND SERVICE PROCEDURE (CORP1023-L3)
Maintenance checks using the Normal Operating Pressures table
Table 1 may be used to help perform maintenance checks. This table is not a procedure for
charging 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.
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
installations 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 2, 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.
Cooling Mode—When the outdoor ambient temperature is 60°F (15°C) and above, use the
cooling mode to adjust the charge using the subcooling method. Target subcooling values
in table 2 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 2 are based on 65-75°F (18-24°C) indoor return air temperature.
INDOOR MATCHUPS
Heat
(+5ºF) (+1ºF)
-024
CBX27UH-024
16
CBX27UH-030
16
CBX32M-030
16
CBX32M-036
16
CBX32MV-024/030
16
CBX32MV-036
16
CBX40UHV-024, -030, -036
16
CH23-51
16
CH33-31
16
CH33-42
16
CR33-48
28
CX34-31
16
CX34-38
16
-030
CBX27UH-030, -036
15
CBX32M-030
19
CBX32M-036
15
CBX32MV-024/030
19
CBX32MV-036
15
CBX40UHV-024, -030, -036
15
CH23-51
19
CH33-31
19
CH33-42
19
CR33-48
30
CX34-31
19
CX34-38
15
CX34-43
CX34-44/48B
15
CX34-49
CX34-50/60C
-036
CBX27UH-036
19
CBX27UH-042
12
CBX32M-036, -042
19
CBX32M-048
12
*Amount of charge required in addition to charge shown on unit nameplate. (Remember to consider lineset length difference.)
8/2012
*2P82012*
Table 2 - XP17 Indoor Units Matchups and Subcooling Charge Levels
Target
*Add
Subcooling
charge
INDOOR MATCHUPS
Cool
lb
oz
-036 (continued)
3
1
6
CBX32MV-036
5
1
9
CBX32MV-048
3
1
6
CBX40UHV-036
5
1
9
CBX40UHV-042, -048
3
1
6
CH23-51
5
1
9
CH33-42, -43
5
1
9
CH33-44/48B
3
1
6
CH33-48C
3
0
11
CR33-48
3
0
11
CX34-38
3
0
0
CX34-43
3
1
6
CX34-44/48B
5
1
9
CX34-49
CX34-50/60C
5
1
3
-042
5
1
7
CBX27UH-042, -048
5
1
3
CBX32M-048
5
1
7
CBX32MV-048
5
1
3
CBX40UHV-042, -048
5
1
3
CH23-51
5
1
7
CH33-43
5
1
7
CH33-44/48B, -48C
5
1
7
CH33-49C
4
0
0
CH33-50/60C
6
1
7
CR33-48
5
1
3
CR33-50/60
6
4
0
11
CX34-38
5
1
3
CX34-43
8
8
1
14
CX34-44/48B
6
4
0
11
CX34-49
CX34-50/60C
7
1
1
-048
5
2
4
CBX27UH-048
7
1
1
CBX27UH-060
5
2
4
CHARGING INFORMATION
Table 1 - Normal Operating Pressures (Liquid +10 and Vapor+5 psig)
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.
Temp
°F (°C)*
Heating Operation
20 (-7)
30 (-1)
40 (4.5)
50 (10)
Cooling Operation
65 (18)
75 (24)
85 (29)
95 (35)
105 (41)
115 (45)
**Temperature of the air entering the outdoor coil.
Target
Subcooling
Heat
Cool
(+5ºF) (+1ºF)
19
12
19
12
19
18
18
18
32
19
18
19
9
18
12
12
12
12
17
14
14
14
14
17
11
19
14
19
8
14
23
15
-024
-030
-036
Liquid Line Pressure/Vapor Line Pressure
291/65
303/63
280/60
309/79
328/77
290/74
319/94
338/92
310/88
340/110
366/110
326/105
233/143
234/137
227/137
269/ 145
270/141
262/140
310/ 148
312/143
306/142
356/ 150
358/146
354/144
405/ 152
408/148
406/147
456/ 155
462/150
463/150
*Add
INDOOR
charge
MATCHUPS
lb
oz
-048 (continued)
7
1
1
CBX32M-048
5
2
4
CBX32M-060
7
1
1
CBX32MV-048
5
2
4
CBX32MV-060
7
0
10
CBX32MV-068
6
1
4
CBX40UHV-048
6
1
4
CBX40UHV-060
6
1
4
CH23-68
4
0
0
CH33-49C
7
1
1
CH33-50/60C
6
1
4
CH33-60D
7
1
1
CH33-62D
9
2
8
CR33-50/60, -60D
6
1
4
CX34-49
CX34-60D
4
1
0
CX34-62C, -62D
4
1
0
-060
4
1
0
CBX27UH-048
4
1
0
CBX27UH-060
7
0
0
CBX32M-048
4
0
0
CBX32M-060
4
0
0
CBX32MV-048
4
0
0
CBX32MV-060
4
0
0
CBX32MV-068
7
0
0
CBX40UHV-048
6
0
8
CBX40UHV-060
6
0
6
CH23-68
4
0
0
CH33-49C
6
0
6
CH33-50/60C
7
1
0
CH33-62D
4
0
0
CR33-50/60, -60D
CX34-49
3
0
2
CX34-60D
8
2
8
CX34-62C, -62D
*P580320-01*
-042
-048
-060
288/59
324/63
330/58
306/68
345/76
354/72
320/85
366/91
368/83
339/107
398/109
391/107
234/138
240/136
238/133
269/141
275/139
278/136
315/144
319/141
322/138
362/147
366/144
369/140
415/147
418/146
422/142
472/150
475/150
481/145
Target
*Add
Subcooling
charge
Heat
Cool
lb
oz
(+5ºF) (+1ºF)
23
3
0
2
20
5
1
0
23
3
0
2
20
5
1
0
15
5
1
7
23
3
0
2
20
5
1
0
15
8
2
8
20
5
1
0
20
5
1
0
25
4
0
0
15
5
1
7
21
4
0
0
15
8
1
0
25
4
0
0
11
4
1
5
23
3
0
0
15
8
1
8
14
3
0
0
18
3
0
12
14
3
0
0
18
3
0
12
13
5
0
15
14
3
0
0
16
3
0
12
18
8
1
8
16
3
0
12
16
3
0
12
13
5
0
15
21
4
0
0
16
3
0
12
13
5
0
15
13
5
0
15
580320-01
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