Page 31
EL16XC1 SERIES
START: Measure outdoor ambient temperature
NOTE - Do not attempt to charge system where a dash appears, system
could be overcharged. Superheat is taken at suction line service port.
Suction line superheat must never be less than 5ºF at the suction line
service port.
USE WEIGH‐IN METHOD
Weigh‐in or remove refrigerant
based upon line length
1. Confirm proper airflow across coil using figure 15.
2. Compare unit pressures with table 1,
Normal
Operating Pressures
.
3. Use SUPERHEAT to correctly charge unit or to
verify the charge is correct.
4. Set thermostat to call for heat (must have a cooling
load between 70‐80ºF (21-26ºC)
5. Connect gauge set.
6. When heat demand is satisfied, set thermostat to
call for cooling.
7. Allow temperatures and pressures to stabilize.
8. Measure the suction line pressure and use the use
value to determine saturation temperature (table
3):
SATº =_________
9. Record suction line temperature:
VAPº =_________
10. Subtract to determine superheat (SHº):
VAPº - _____ SATº ______ = SHº______
11. Record the wet bulb temperature (air entering
indoor coil):
WB =_______
12. Record outdoor ambient temperature.
13. Compare results with applicable charging sticker
located on unit access panel or copy located at the
end of this manual. See table 6 for to determine
applicable charging information for specific model.
If value is
MORE
than shown, then
ADD
refrigerant.
If value is
LESS
than
shown, then
REMOVE
refrigerant.
If refrigerant is
REMOVED
, retest to
confirm that unit is
properly charged.
MORE
or
LESS
If refrigerant is
ADDED
, retest to
confirm that unit is
properly charged.
ABOVE or
BELOW
39ºF and
BELOW
40ºF
and
ABOVE
D
Figure 20. Using HFC-410A Superheat (Fixed Orifice) Charge Method
Table 3. HFC-410A Temperature (°F) - Pressure (Psig)
°F
Psig
°F
Psig
°F
Psig
°F
Psig
°F
Psig
°F
Psig
°F
Psig
°F
Psig
32
100.8
48
137.1
63
178.5
79
231.6
94
290.8
110
365.0
125
445.9
141
545.6
33
102.9
49
139.6
64
181.6
80
235.3
95
295.1
111
370.0
126
451.8
142
552.3
34
105.0
50
142.2
65
184.3
81
239.0
96
299.4
112
375.1
127
457.6
143
559.1
35
107.1
51
144.8
66
187.7
82
242.7
97
303.8
113
380.2
128
463.5
144
565.9
36
109.2
52
147.4
67
190.9
83
246.5
98
308.2
114
385.4
129
469.5
145
572.8
37
111.4
53
150.1
68
194.1
84
250.3
99
312.7
115
390.7
130
475.6
146
579.8
38
113.6
54
152.8
69
197.3
85
254.1
100
317.2
116
396.0
131
481.6
147
586.8
39
115.8
55
155.5
70
200.6
86
258.0
101
321.8
117
401.3
132
487.8
148
593.8
40
118.0
56
158.2
71
203.9
87
262.0
102
326.4
118
406.7
133
494.0
149
601.0
41
120.3
57
161.0
72
207.2
88
266.0
103
331.0
119
412.2
134
500.2
150
608.1
42
122.6
58
163.9
73
210.6
89
270.0
104
335.7
120
417.7
135
506.5
151
615.4
43
125.0
59
166.7
74
214.0
90
274.1
105
340.5
121
423.2
136
512.9
152
622.7
44
127.3
60
169.6
75
217.4
91
278.2
106
345.3
122
428.8
137
519.3
153
630.1
45
129.7
61
172.6
76
220.9
92
282.3
107
350.1
123
434.5
138
525.8
154
637.5
46
132.2
62
175.4
77
224.4
93
286.5
108
355.0
124
440.2
139
532.4
155
645.0
47
134.6
78
228.0
109
360.0
140
539.0
