Lennox XP21 Series User Manual

CHARGING INFORMATION
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.
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 -024 -030 -036 -042 -048 -060
°F (°C)* Liquid Line Pressure/Vapor Line Pressure
Heating Operation
20 (-7) 291/65 303/63 280/60 288/59 324/63 330/58
30 (-1) 309/79 328/77 290/74 306/68 345/76 354/72
40 (4.5) 319/94 338/92 310/88 320/85 366/91 368/83
50 (10) 340/110 366/110 326/105 339/107 398/109 391/107
Cooling Operation
65 (18) 233/143 234/137 227/137 234/138 240/136 238/133
75 (24) 269/ 145 270/141 262/140 269/141 275/139 278/136
85 (29) 310/ 148 312/143 306/142 315/144 319/141 322/138
95 (35) 356/ 150 358/146 354/144 362/147 366/144 369/140
105 (41) 405/ 152 408/148 406/147 415/147 418/146 422/142
115 (45) 456/ 155 462/150 463/150 472/150 475/150 481/145
**Temperature of the air entering the outdoor coil.
Table 2 - XP17 Indoor Units Matchups and Subcooling Charge Levels
INDOOR MATCHUPS
Target
Subcooling
Heat Cool
(+
5ºF) (+1ºF)
*Add
charge
INDOOR MATCHUPS
Target
Subcooling
Heat Cool
(+
5ºF) (+1ºF)
*Add
charge
INDOOR
MATCHUPS
Target
Subcooling
Heat Cool
(+
5ºF) (+1ºF)
*Add
charge
lb oz lb oz lb oz
-024 -036 (continued) -048 (continued)
CBX27UH-024 16 3 1 6 CBX32MV-036 19 7 1 1 CBX32M-048 23 3 0 2
CBX27UH-030 16 5 1 9 CBX32MV-048 12 5 2 4 CBX32M-060 20 5 1 0
CBX32M-030 16 3 1 6 CBX40UHV-036 19 7 1 1 CBX32MV-048 23 3 0 2
CBX32M-036 16 5 1 9 CBX40UHV-042, -048 12 5 2 4 CBX32MV-060 20 5 1 0
CBX32MV-024/030 16 3 1 6 CH23-51 19 7 0 10 CBX32MV-068 15 5 1 7
CBX32MV-036 16 5 1 9 CH33-42, -43 18 6 1 4 CBX40UHV-048 23 3 0 2
CBX40UHV-024, -030, -036 16 5 1 9 CH33-44/48B 18 6 1 4 CBX40UHV-060 20 5 1 0
CH23-51 16 3 1 6 CH33-48C 18 6 1 4 CH23-68 15 8 2 8
CH33-31 16 3 0 11 CR33-48 32 4 0 0 CH33-49C 20 5 1 0
CH33-42 16 3 0 11 CX34-38 19 7 1 1 CH33-50/60C 20 5 1 0
CR33-48 28 3 0 0 CX34-43 18 6 1 4 CH33-60D 25 4 0 0
CX34-31 16 3 1 6 CX34-44/48B 19 7 1 1 CH33-62D 15 5 1 7
CX34-38 16 5 1 9 CX34-49 9 9 2 8 CR33-50/60, -60D 21 4 0 0
-030 CX34-50/60C 18 6 1 4 CX34-49 15 8 1 0
CBX27UH-030, -036 15 5 1 3 -042 CX34-60D 25 4 0 0
CBX32M-030 19 5 1 7 CBX27UH-042, -048 12 4 1 0 CX34-62C, -62D 11 4 1 5
CBX32M-036 15 5 1 3 CBX32M-048 12 4 1 0 -060
CBX32MV-024/030 19 5 1 7 CBX32MV-048 12 4 1 0 CBX27UH-048 23 3 0 0
CBX32MV-036 15 5 1 3 CBX40UHV-042, -048 12 4 1 0 CBX27UH-060 15 8 1 8
CBX40UHV-024, -030, -036 15 5 1 3 CH23-51 17 7 0 0 CBX32M-048 14 3 0 0
CH23-51 19 5 1 7 CH33-43 14 4 0 0 CBX32M-060 18 3 0 12
CH33-31 19 5 1 7 CH33-44/48B, -48C 14 4 0 0 CBX32MV-048 14 3 0 0
CH33-42 19 5 1 7 CH33-49C 14 4 0 0 CBX32MV-060 18 3 0 12
CR33-48 30 4 0 0 CH33-50/60C 14 4 0 0 CBX32MV-068 13 5 0 15
CX34-31 19 6 1 7 CR33-48 17 7 0 0 CBX40UHV-048 14 3 0 0
CX34-38 15 5 1 3 CR33-50/60 11 6 0 8 CBX40UHV-060 16 3 0 12
CX34-43 6 4 0 11 CX34-38 19 6 0 6 CH23-68 18 8 1 8
CX34-44/48B 15 5 1 3 CX34-43 14 4 0 0 CH33-49C 16 3 0 12
CX34-49 8 8 1 14 CX34-44/48B 19 6 0 6 CH33-50/60C 16 3 0 12
CX34-50/60C 6 4 0 11 CX34-49 8 7 1 0 CH33-62D 13 5 0 15
-036 CX34-50/60C 14 4 0 0 CR33-50/60, -60D 21 4 0 0
CBX27UH-036 19 7 1 1 -048 CX34-49 16 3 0 12
CBX27UH-042 12 5 2 4 CBX27UH-048 23 3 0 2 CX34-60D 13 5 0 15
CBX32M-036, -042 19 7 1 1 CBX27UH-060 15 8 2 8 CX34-62C, -62D 13 5 0 15
CBX32M-048 12 5 2 4
*Amount of charge required in addition to charge shown on unit nameplate. (Remember to consider lineset length difference.)
*2P82012* *P580320-01*
8/2012 580320-01

Lennox XP21 Series Specifications

General

Brand	Lennox
Model	XP21 Series
Category	Heat Pump
Language	English