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1. CHARGE THE SYSTEM BY WEIGHT, IN OUTDOOR TEMPERATURE IS BELOW 65º
Outdoor units are factory charged with R410A for 15 ft. Of line set. Add or remove 0.6oz. For every foot of line set
different than 15 ft. Final charge adjustment must be made per item (2) below, once the outdoor temperature rises
above 65ºF.
2. IF OUTDOOR TEMPERATURE IS ABOVE 65ºF, ADJUST CHARGE AS FOLLOWS:
A. Check for proper air flow and run the system for 20 minutes for stabilization.
B. Use superheat for orifice coils (see table below).
C. Use subcooling for TXV coils (see table below), provided that superheat is within 8-16ºF at outdoor unit and the
referenced pressures below are within ±3 psi for low side and ±10 psi for high side.
D. Contact technical service, if measured values are outside of the range of the listed data.
MODELS
18
OUTDOOR
LIQUID LINE SATURATION TEMPERATURE MINUS LIQUID LINE TEMPERATURE
TEMP (ºF)
65
8
75
8
85
8
95
8
105
10
115
11
TABLE 2 - APPROACH METHOD (TXV SYSTEM) ± 1ºF - FOR REFERENCE ONLY
LIQUID LINE TEMPERATURE MINUS OUTDOOR AMBIENT TEMPERATURE
TEMP ( ºF )
6
OUTDOOR
TEMP (ºF)
65
240 / 130
75
270 / 135
85
300 / 140
95
350 / 145
105
470 / 150
115
530 / 155
TABLE 4 - SUPERHEAT METHOD ( ORIFICE SYSTEM ) ± 1ºF
SUCTION LINE SATURATION TEMPERATURE MINUS SUCTION LINE TEMPERATURE
OUTDOOR TEMP (ºF)
65
SUPERHEAT (ºF)
35
ALL MEASUREMENTS ARE AT THE SERVICE VALVES AND ARE BASED ON 80db/67wb
INDOOR TEMPERATURE
ORIFICE
18
24
0.053
0.057
TXV
H4TXV01
AIR CONDITIONING CHARGING PROCEDURE
24
30
TABLE 1 - SUBCOOLING METHOD (TXV SYSTEM) ± 1ºF
8
7
8
7
8
7
8
7
10
9
11
9
5
6
TABLE 3 - OPERATING PRESSURES ( FOR REFERNCE )
HIGH / LOW PRESSURES ( PSI )
245 / 130
230 / 130
280 / 135
270 / 135
320 / 140
310 / 140
360 / 145
350 / 145
410 / 150
400 / 150
470 / 150
460 / 150
70
75
80
85
90
30
25
22
18
12
30
36
42
0.065
0.071 NA
H4TXV02
Figure 15. NS16AC
Page 30
36
42
6
8
6
8
6
8
8
8
8
10
8
10
7
5
240 / 130
230 / 135
275 / 135
270 / 140
310 / 140
310 / 145
370 / 145
355 / 150
415 / 150
410 / 150
470 / 150
460 / 155
95
100
105
8
5
5
48
60
NA
NA
H4TXV03
48
60
8
5
8
5
8
5
8
5
8
5
9
6
5
5
210 / 125
200 / 125
250 / 135
240 / 130
300 / 140
290 / 135
365 / 142
340 / 140
400 / 144
390 / 145
460 / 145
440 / 149
31-5000749 Rev. 0
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