Lennox Elite Series Installation Instructions Manual page 25

START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
Weigh-in or remove refrigerant
based upon line length
ºF*
40
45
50
55
60
65
70
75
80
85
90
95
100
105
If refrigerant is
110
REMOVED, retest to
115
confirm that unit is
properly charged. * Dry−bulb temperature (ºF) of entering outdoor ambient air.
If value is LESS than
shown, then REMOVE
refrigerant.
Figure 23. Using HFC−410A Superheat (Fixed Orifice) Charge Method
°F Psig °F Psig
32 100.8 48 137.1
33 102.9 49 139.6
34 105.0 50 142.2
35 107.1 51 144.8
36 109.2 52 147.4
37 111.4 53 150.1
38 113.6 54 152.8
39 115.8 55 155.5
40 118.0 56 158.2
41 120.3 57 161.0
42 122.6 58 163.9
43 125.0 59 166.7
44 127.3 60 169.6
45 129.7 61 172.6
46 132.2 62 175.4
47 134.6
ABOVE or
BELOW
39ºF and
BELOW
SHº (Superheat) Values (+/−5ºF)
Wet Bulb (air entering indoor coil)
50 52 54 56 58 60 62 64 66 68 70 72 74 76
15 18 20 23 26 29 32 34 38 41 43 46 48 51
13 16 18 21 24 27 30 33 36 39 41 44 46 49
11 14 16 19 22 25 28 31 34 37 39 42 44 47
9 12 14 17 20 23 27 30 33 36 38 40 42 44
7 10 12 15 18 21 24 27 30 33 35 38 40 43
- 6 10 13 16 19 21 24 27 30 33 36 38 41
- - 7 10 13 16 19 21 24 27 30 33 36 39
- - - 6 9 12 15 18 21 24 28 31 34 37
- - - - 5 8 12 15 18 21 25 28 31 35
- - - - - - 8 11 15 19 22 26 30 33
- - - - - - 5 9 13 16 20 24 27 31
- - - - - - - 6 10 14 18 22 25 29
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
MORE or
LESS
Table 3. HFC−410A Temperature (°F) − Pressure (Psig)
°F Psig °F Psig
63 178.5 79 231.6
64 181.6 80 235.3
65 184.3 81 239.0
66 187.7 82 242.7
67 190.9 83 246.5
68 194.1 84 250.3
69 197.3 85 254.1
70 200.6 86 258.0
71 203.9 87 262.0
72 207.2 88 266.0
73 210.6 89 270.0
74 214.0 90 274.1
75 217.4 91 278.2
76 220.9 92 282.3
77 224.4 93 286.5
78 228.0
1. Confirm proper airflow across coil using figure 19.
40ºF
2. Compare unit pressures with table 4, Normal
and
ABOVE
3. Use SUPERHEAT to correctly charge unit or to
4. Set thermostat to call for heat (must have a cooling
5. Connect gauge set.
6. When heat demand is satisfied, set thermostat to
7. Allow temperatures and pressures to stabilize.
8. Measure the suction line pressure and use the use
9. Record suction line temperature:
10. Subtract to determine superheat (SHº):
11. Record the wet bulb temperature (air entering
12. Record outdoor ambient temperature.
13. Compare results with table to the left.
8 12 16 21 24 28
5 9 13 17 22 26
NOTE − Do not attempt to charge system where a
- 6 11 15 20 25
dash appears, system could be overcharged.
Superheat is taken at suction line service port.
- - 8 14 18 24
Suction line superheat must never be less than 5ºF
at the suction line service port.
If value is MORE
than shown, then
ADD refrigerant.
°F Psig °F
94 290.8 110
95 295.1 111
96 299.4 112
97 303.8 113
98 308.2 114
99 312.7 115
100 317.2 116
101 321.8 117
102 326.4 118
103 331.0 119
104 335.7 120
105 340.5 121
106 345.3 122
107 350.1 123
108 355.0 124
109 360.0
Page 25
Operating Pressures.
verify the charge is correct.
load between 70-80ºF (21−26ºC)
call for cooling.
value to determine saturation temperature (table
3):
SATº =_________
VAPº =_________
VAPº − _____ SATº ______ = SHº______
indoor coil):
WB =_______
If refrigerant is
ADDED, retest to
confirm that unit is
properly charged.
Psig °F Psig
365.0 125 445.9
370.0 126 451.8
375.1 127 457.6
380.2 128 463.5
385.4 129 469.5
390.7 130 475.6
396.0 131 481.6
401.3 132 487.8
406.7 133 494.0
412.2 134 500.2
417.7 135 506.5
423.2 136 512.9
428.8 137 519.3
434.5 138 525.8
440.2 139 532.4
140 539.0
°F Psig
141 545.6
142 552.3
143 559.1
144 565.9
145 572.8
146 579.8
147 586.8
148 593.8
149 601.0
150 608.1
151 615.4
152 622.7
153 630.1
154 637.5
155 645.0
XC13 SERIES