Refrigerant scales shall be calibrated according to the manufacturer's recommended procedures. When the manufacturer certifies the calibration for a limited time, the refrigerant scale shall be recalibrated according to the manufacturers required procedure when the calibration period expires.
The weigh-in procedure shall be performed in accordance with all manufacturer specifications to confirm:
(a) The system is braised with dry nitrogen in the lines and indoor coil.
(b) The system is evacuated to 500 microns or less and, when isolated, rises no more than 300 microns over five minutes.
(c) The lineset correction is calculated based on the length and diameter of the lineset.
(d) The indoor coil correction to refrigerant weight is used if it is supplied by the manufacturer.
(e) The amount of charge calculated for the lineset correction (and indoor coil correction if available) is added or removed, or the total charge based on the lineset, indoor coil, and standard label charge is installed.
The HVAC Installer shall certify on the Certificate of Installation that the manufacturer's specifications for these procedures have been met.
RA3.2.3.2 HERS Rater - Observation of Weigh-In Charging Procedure
When the Standards indicate this procedure is required, or is an option for compliance, the HERS Rater shall coordinate with the HVAC Installer to observe the weigh-in charging procedure.
HERS Rater shall observe and confirm:
(a) The system is evacuated to 500 microns or less and, when isolated, rises no more than 300 microns over five minutes.
(b) The lineset correction is calculated based on the length and diameter of the lineset.
(c) The indoor coil correction to refrigerant weight is used if it is supplied by the manufacturer.
(d) The installer adds or removes the amount of charge calculated for the lineset correction or installs the total charge based on lineset, indoor coil, and standard label charge.
|
|
|
Return Air Wet-Bulb Temperature (°F) (T return, wb) | ||||||||||||||||||||||||||
|
|
|
50 |
51 |
52 |
53 |
54 |
55 |
56 |
57 |
58 |
59 |
60 |
61 |
62 |
63 |
64 |
65 |
66 |
67 |
68 |
69 |
70 |
71 |
72 |
73 |
74 |
75 |
76 |
|
Condenser Air Dry-Bulb Temperature (°F) (T condenser, db) |
55 |
8.8 |
10.1 |
11.5 |
12.8 |
14.2 |
15.6 |
17.1 |
18.5 |
20.0 |
21.5 |
23.1 |
24.6 |
26.2 |
27.8 |
29.4 |
31.0 |
32.4 |
33.8 |
35.1 |
36.4 |
37.7 |
39.0 |
40.2 |
41.5 |
42.7 |
43.9 |
45.0 |
|
56 |
8.6 |
9.9 |
11.2 |
12.6 |
14.0 |
15.4 |
16.8 |
18.2 |
19.7 |
21.2 |
22.7 |
24.2 |
25.7 |
27.3 |
28.9 |
30.5 |
31.8 |
33.2 |
34.6 |
35.9 |
37.2 |
38.5 |
39.7 |
41.0 |
42.2 |
43.4 |
44.6 | |
|
57 |
8.3 |
9.6 |
11.0 |
12.3 |
13.7 |
15.1 |
16.5 |
17.9 |
19.4 |
20.8 |
22.3 |
23.8 |
25.3 |
26.8 |
28.3 |
29.9 |
31.3 |
32.6 |
34.0 |
35.3 |
36.7 |
38.0 |
39.2 |
40.5 |
41.7 |
43.0 |
44.2 | |
|
58 |
7.9 |
9.3 |
10.6 |
12.0 |
13.4 |
14.8 |
16.2 |
17.6 |
19.0 |
20.4 |
21.9 |
23.3 |
24.8 |
26.3 |
27.8 |
29.3 |
30.7 |
32.1 |
33.5 |
34.8 |
36.1 |
37.5 |
38.7 |
40.0 |
41.3 |
42.5 |
43.7 | |
|
59 |
7.5 |
8.9 |
10.2 |
11.6 |
13.0 |
14.4 |
15.8 |
17.2 |
18.6 |
20.0 |
21.4 |
22.9 |
24.3 |
25.7 |
27.2 |
28.7 |
30.1 |
31.5 |
32.9 |
34.3 |
35.6 |
36.9 |
38.3 |
39.5 |
40.8 |
42.1 |
43.3 | |
|
60 |
7.0 |
8.4 |
9.8 |
11.2 |
12.6 |
14.0 |
15.4 |
16.8 |
18.2 |
19.6 |
21.0 |
22.4 |
23.8 |
25.2 |
26.6 |
28.1 |
29.6 |
31.0 |
32.4 |
33.7 |
35.1 |
36.4 |
37.8 |
39.1 |
40.4 |
41.6 |
42.9 | |
|
61 |
6.5 |
7.9 |
9.3 |
10.7 |
12.1 |
13.5 |
14.9 |
16.3 |
17.7 |
19.1 |
20.5 |
21.9 |
23.3 |
24.7 |
26.1 |
27.5 |
29.0 |
30.4 |
31.8 |
33.2 |
34.6 |
35.9 |
37.3 |
38.6 |
39.9 |
41.2 |
42.4 | |
|
62 |
6.0 |
7.4 |
8.8 |
10.2 |
11.7 |
13.1 |
14.5 |
15.9 |
17.3 |
18.7 |
20.1 |
21.4 |
22.8 |
24.2 |
25.5 |
27.0 |
28.4 |
29.9 |
31.3 |
32.7 |
34.1 |
35.4 |
36.8 |
38.1 |
39.4 |
40.7 |
42.0 | |
|
63 |
5.3 |
6.8 |
8.3 |
9.7 |
11.1 |
12.6 |
14.0 |
15.4 |
16.8 |
18.2 |
19.6 |
20.9 |
22.3 |
23.6 |
25.0 |
26.4 |
27.8 |
29.3 |
30.7 |
32.2 |
33.6 |
34.9 |
36.3 |
37.7 |
39.0 |
40.3 |
41.6 | |
|
64 |
- |
6.1 |
7.6 |
9.1 |
10.6 |
12.0 |
13.5 |
14.9 |
16.3 |
17.7 |
19.0 |
20.4 |
21.7 |
23.1 |
24.4 |
25.8 |
27.3 |
28.7 |
30.2 |
31.6 |
33.0 |
34.4 |
35.8 |
37.2 |
38.5 |
39.9 |
41.2 | |
|
65 |
- |
5.4 |
7.0 |
8.5 |
10.0 |
11.5 |
12.9 |
14.3 |
15.8 |
17.1 |
18.5 |
19.9 |
21.2 |
22.5 |
23.8 |
25.2 |
26.7 |
28.2 |
29.7 |
31.1 |
32.5 |
33.9 |
35.3 |
36.7 |
38.1 |
39.4 |
40.8 | |
|
66 |
- |
|
6.3 |
7.8 |
9.3 |
10.8 |
12.3 |
13.8 |
15.2 |
16.6 |
18.0 |
19.3 |
20.7 |
22.0 |
23.2 |
24.6 |
26.1 |
27.6 |
29.1 |
30.6 |
32.0 |
33.4 |
34.9 |
36.3 |
37.6 |
39.0 |
40.4 | |
|
67 |
- |
- |
5.5 |
7.1 |
8.7 |
10.2 |
11.7 |
13.2 |
14.6 |
16.0 |
17.4 |
18.8 |
20.1 |
21.4 |
22.7 |
24.1 |
25.6 |
27.1 |
28.6 |
30.1 |
31.5 |
33.0 |
34.4 |
35.8 |
37.2 |
38.6 |
39.9 | |
|
68 |
- |
- |
- |
6.3 |
8.0 |
9.5 |
11.1 |
12.6 |
14.0 |
15.5 |
16.8 |
18.2 |
19.5 |
20.8 |
22.1 |
23.5 |
25.0 |
26.5 |
28.0 |
29.5 |
31.0 |
32.5 |
33.9 |
35.3 |
36.8 |
38.1 |
39.5 | |
|
69 |
- |
- |
- |
5.5 |
7.2 |
8.8 |
10.4 |
11.9 |
13.4 |
14.8 |
16.3 |
17.6 |
19.0 |
20.3 |
21.5 |
22.9 |
24.4 |
26.0 |
27.5 |
29.0 |
30.5 |
32.0 |
33.4 |
34.9 |
36.3 |
37.7 |
39.1 | |
|
70 |
- |
- |
- |
- |
6.4 |
8.1 |
9.7 |
11.2 |
12.7 |
14.2 |
15.7 |
17.0 |
18.4 |
19.7 |
20.9 |
22.3 |
23.9 |
25.4 |
27.0 |
28.5 |
30.0 |
31.5 |
33.0 |
34.4 |
35.9 |
37.3 |
38.7 | |
|
71 |
- |
- |
- |
- |
5.6 |
7.3 |
8.9 |
10.5 |
12.1 |
13.6 |
15.0 |
16.4 |
17.8 |
19.1 |
20.3 |
21.7 |
23.3 |
24.9 |
26.4 |
28.0 |
29.5 |
31.0 |
32.5 |
34.0 |
35.4 |
36.9 |
38.3 | |
|
72 |
- |
- |
- |
- |
- |
6.4 |
8.1 |
9.8 |
11.4 |
12.9 |
14.4 |
15.8 |
17.2 |
18.5 |
19.7 |
21.2 |
22.8 |
24.3 |
25.9 |
27.4 |
29.0 |
30.5 |
32.0 |
33.5 |
35.0 |
36.5 |
37.9 | |
|
73 |
- |
- |
- |
- |
- |
5.6 |
7.3 |
9.0 |
10.7 |
12.2 |
13.7 |
15.2 |
16.6 |
17.9 |
19.2 |
20.6 |
22.2 |
23.8 |
25.4 |
26.9 |
28.5 |
30.0 |
31.5 |
33.1 |
34.6 |
36.0 |
37.5 | |
|
74 |
- |
- |
- |
- |
- |
- |
6.5 |
8.2 |
9.9 |
11.5 |
13.1 |
14.5 |
15.9 |
17.3 |
18.6 |
20.0 |
21.6 |
23.2 |
24.8 |
26.4 |
28.0 |
29.5 |
31.1 |
32.6 |
34.1 |
35.6 |
37.1 | |
|
75 |
- |
- |
- |
- |
- |
- |
5.6 |
7.4 |
9.2 |
10.8 |
12.4 |
13.9 |
15.3 |
16.7 |
18.0 |
19.4 |
21.1 |
22.7 |
24.3 |
25.9 |
27.5 |
29.1 |
30.6 |
32.2 |
33.7 |
35.2 |
36.7 | |
|
76 |
- |
- |
- |
- |
- |
- |
- |
6.6 |
8.4 |
10.1 |
11.7 |
13.2 |
14.7 |
16.1 |
17.4 |
18.9 |
20.5 |
22.1 |
23.8 |
25.4 |
27.0 |
28.6 |
30.1 |
31.7 |
33.3 |
34.8 |
36.3 | |
|
77 |
- |
- |
- |
- |
- |
- |
- |
5.7 |
7.5 |
9.3 |
11.0 |
12.5 |
14.0 |
15.4 |
16.8 |
18.3 |
20.0 |
21.6 |
23.2 |
24.9 |
26.5 |
28.1 |
29.7 |
31.3 |
32.8 |
34.4 |
36.0 | |
|
78 |
- |
- |
- |
- |
- |
- |
- |
- |
6.7 |
8.5 |
10.2 |
11.8 |
13.4 |
14.8 |
16.2 |
17.7 |
19.4 |
21.1 |
22.7 |
24.4 |
26.0 |
27.6 |
29.2 |
30.8 |
32.4 |
34.0 |
35.6 | |
|
79 |
- |
- |
- |
- |
- |
- |
- |
- |
5.9 |
7.7 |
9.5 |
11.1 |
12.7 |
14.2 |
15.6 |
17.1 |
18.8 |
20.5 |
22.2 |
23.8 |
25.5 |
27.1 |
28.8 |
30.4 |
32.0 |
33.6 |
35.2 | |
|
80 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.9 |
8.7 |
10.4 |
12.0 |
13.5 |
15.0 |
16.6 |
18.3 |
20.0 |
21.7 |
23.3 |
25.0 |
26.7 |
28.3 |
29.9 |
31.6 |
33.2 |
34.8 | |
|
81 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.0 |
7.9 |
9.7 |
11.3 |
12.9 |
14.3 |
16.0 |
17.7 |
19.4 |
21.1 |
22.8 |
24.5 |
26.2 |
27.9 |
29.5 |
31.2 |
32.8 |
34.4 | |
|
82 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.2 |
7.1 |
8.9 |
10.6 |
12.2 |
13.7 |
15.4 |
17.2 |
18.9 |
20.6 |
22.3 |
24.0 |
25.7 |
27.4 |
29.1 |
30.7 |
32.4 |
34.0 | |
|
83 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.3 |
8.2 |
9.9 |
11.6 |
13.1 |
14.9 |
16.6 |
18.4 |
20.1 |
21.8 |
23.5 |
25.2 |
26.9 |
28.6 |
30.3 |
32.0 |
33.7 | |
|
84 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.5 |
7.4 |
9.2 |
10.9 |
12.5 |
14.3 |
16.1 |
17.8 |
19.6 |
21.3 |
23.0 |
24.8 |
26.5 |
28.2 |
29.9 |
31.6 |
33.3 | |
|
85 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.6 |
8.5 |
10.3 |
11.9 |
13.7 |
15.5 |
17.3 |
19.0 |
20.8 |
22.6 |
24.3 |
26.0 |
27.8 |
29.5 |
31.2 |
32.9 | |
|
86 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.8 |
7.8 |
9.6 |
11.3 |
13.2 |
15.0 |
16.7 |
18.5 |
20.3 |
22.1 |
23.8 |
25.6 |
27.3 |
29.1 |
30.8 |
32.6 | |
|
87 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.0 |
7.0 |
8.9 |
10.6 |
12.6 |
14.4 |
16.2 |
18.0 |
19.8 |
21.6 |
23.4 |
25.1 |
26.9 |
28.7 |
30.4 |
32.2 | |
|
88 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.3 |
8.2 |
10.0 |
12.0 |
13.9 |
15.7 |
17.5 |
19.3 |
21.1 |
22.9 |
24.7 |
26.5 |
28.3 |
30.1 |
31.8 | |
|
89 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.5 |
7.5 |
9.4 |
11.5 |
13.3 |
15.1 |
17.0 |
18.8 |
20.6 |
22.4 |
24.3 |
26.1 |
27.9 |
29.7 |
31.5 | |
Shaded area requires return plenum temperature of 70°F or higher.
Table RA3.2-2 Target Superheat (Suction Line Temperature - Evaporator Saturation Temperature)
|
|
|
Return Air Wet-Bulb Temperature (°F) (T return, wb) | ||||||||||||||||||||||||||
|
|
|
50 |
51 |
52 |
53 |
54 |
55 |
56 |
57 |
58 |
59 |
60 |
61 |
62 |
63 |
64 |
65 |
66 |
67 |
68 |
69 |
70 |
71 |
72 |
73 |
74 |
75 |
76 |
|
Condenser Air Dry-Bulb Temperature (°F) (T condenser, db) |
90 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.8 |
8.8 |
10.9 |
12.8 |
14.6 |
16.5 |
18.3 |
20.1 |
22.0 |
23.8 |
25.6 |
27.5 |
29.3 |
31.1 |
|
91 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.1 |
8.1 |
10.3 |
12.2 |
14.1 |
15.9 |
17.8 |
19.7 |
21.5 |
23.4 |
25.2 |
27.1 |
28.9 |
30.8 | |
|
92 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.4 |
7.5 |
9.8 |
11.7 |
13.5 |
15.4 |
17.3 |
19.2 |
21.1 |
22.9 |
24.8 |
26.7 |
28.5 |
30.4 | |
|
93 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.8 |
9.2 |
11.1 |
13.0 |
14.9 |
16.8 |
18.7 |
20.6 |
22.5 |
24.4 |
26.3 |
28.2 |
30.1 | |
|
94 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.2 |
8.7 |
10.6 |
12.5 |
14.4 |
16.3 |
18.2 |
20.2 |
22.1 |
24.0 |
25.9 |
27.8 |
29.7 | |
|
95 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.6 |
8.1 |
10.0 |
12.0 |
13.9 |
15.8 |
17.8 |
19.7 |
21.6 |
23.6 |
25.5 |
27.4 |
29.4 | |
|
96 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
7.5 |
9.5 |
11.4 |
13.4 |
15.3 |
17.3 |
19.2 |
21.2 |
23.2 |
25.1 |
27.1 |
29.0 | |
|
97 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
7.0 |
8.9 |
10.9 |
12.9 |
14.9 |
16.8 |
18.8 |
20.8 |
22.7 |
24.7 |
26.7 |
28.7 | |
|
98 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.4 |
8.4 |
10.4 |
12.4 |
14.4 |
16.4 |
18.3 |
20.3 |
22.3 |
24.3 |
26.3 |
28.3 | |
|
99 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.8 |
7.9 |
9.9 |
11.9 |
13.9 |
15.9 |
17.9 |
19.9 |
21.9 |
24.0 |
26.0 |
28.0 | |
|
100 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.3 |
7.3 |
9.3 |
11.4 |
13.4 |
15.4 |
17.5 |
19.5 |
21.5 |
23.6 |
25.6 |
27.7 | |
|
101 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.8 |
8.8 |
10.9 |
12.9 |
15.0 |
17.0 |
19.1 |
21.1 |
23.2 |
25.3 |
27.3 | |
|
102 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.2 |
8.3 |
10.4 |
12.4 |
14.5 |
16.6 |
18.6 |
20.7 |
22.8 |
24.9 |
27.0 | |
|
103 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.7 |
7.8 |
9.9 |
11.9 |
14.0 |
16.1 |
18.2 |
20.3 |
22.4 |
24.5 |
26.7 | |
|
104 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.2 |
7.2 |
9.3 |
11.5 |
13.6 |
15.7 |
17.8 |
19.9 |
22.1 |
24.2 |
26.3 | |
|
105 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.7 |
8.8 |
11.0 |
13.1 |
15.2 |
17.4 |
19.5 |
21.7 |
23.8 |
26.0 | |
|
106 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.2 |
8.3 |
10.5 |
12.6 |
14.8 |
17.0 |
19.1 |
21.3 |
23.5 |
25.7 | |
|
107 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.7 |
7.9 |
10.0 |
12.2 |
14.4 |
16.6 |
18.7 |
21.0 |
23.2 |
25.4 | |
|
108 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.2 |
7.4 |
9.5 |
11.7 |
13.9 |
16.1 |
18.4 |
20.6 |
22.8 |
25.1 | |
|
109 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.9 |
9.1 |
11.3 |
13.5 |
15.7 |
18.0 |
20.2 |
22.5 |
24.7 | |
|
110 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.4 |
8.6 |
10.8 |
13.1 |
15.3 |
17.6 |
19.9 |
22.1 |
24.4 | |
|
111 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.9 |
8.1 |
10.4 |
12.6 |
14.9 |
17.2 |
19.5 |
21.8 |
24.1 | |
|
112 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
5.4 |
7.6 |
9.9 |
12.2 |
14.5 |
16.8 |
19.1 |
21.5 |
23.8 | |
|
113 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
7.2 |
9.5 |
11.8 |
14.1 |
16.4 |
18.8 |
21.1 |
23.5 | |
|
114 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.7 |
9.0 |
11.4 |
13.7 |
16.1 |
18.4 |
20.8 |
23.2 | |
|
115 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
6.2 |
8.6 |
10.9 |
13.3 |
15.7 |
18.1 |
20.5 |
22.9 | |