CHARGING INFORMATION
FOR COMPLETE CHARGING DETAILS, REFER TO THE OUTDOOR UNIT INSTALLATION INSTRUCTION.
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 (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
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.)
*2P0210*
*P580287-01*
02/10
580287-01
Summary of Contents for iComfort SL18XC1 Series
Page 44: ...Page 44 XP17 Figure 21 Typical XP17 Wiring XP17 XX 230 06...
Page 45: ...Page 45 XP17 Factory Wiring Diagrams Figure 22 Typical Factory Wiring XP17 XX 230 01...
Page 46: ...Page 46 XP17 Figure 23 Typical Factory Wiring XP17 XX 230 02...
Page 47: ...Page 47 XP17 Figure 24 Typical Factory Wiring XP17 XX 230 03 and 05...
Page 48: ...Page 48 XP17 Figure 25 Typical Factory Wiring XP17 XX 230 06...
