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.
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