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Table 8 — 38AUD_16/25/28 Piping Recommendations (Dual-Circuit)
MODEL &
LINEAR LINE (FT)
NOMINAL
EQUIV. LINE (FT)
CAPACITY
Liquid Line Size (in.)
Liquid PD (F)
Max Lift (ft)
38AUD_16
Max Lift PD (F)
TC 92.9
Suction Line size (in.)
Each,
Suction Line PD (F)
SC 15.1°F
(Cap Red)
Charge (lb)
#/TR
Liquid Line Size (in.)
Liquid PD (F)
Max Lift (ft)
38AUD_25
Max Lift PD (F)
TC 121.2
Suction Line Size (in.)
Each,
Suction Line PD (F)
SC 10.6°F
(Cap Red)
Charge (lb)
#/TR
Liquid Line Size (in.)
Liquid PD (F)
Max Lift (ft)
38AUD_28
Max Lift PD (F)
TC 281.9
Suction Line Size (in.)
Each,
Suction Line PD (F)
SC 13.9°F
(Cap Red)
Charge (lb)
#/TR
NOTE(S):
a. 38AUD units require TWO sets of refrigeration piping.
LEGEND
#/TR
— Charge to unit capacity ratio, lb per ton (at 45°F SST, 95°F OAT)
Cap Red
— Capacity reduction caused by suction line pressure drop > 2°F
Liquid PD (F)
— Liquid line pressure drop, saturated temperature, °F
Max Lift
— Maximum liquid lift (Indoor unit ABOVE outdoor unit only), at maximum permitted pressure drop.
Max Lift PD (F)
— Pressure drop including Maximum liquid lift value
SC
— Sub-cooling, °F (at liquid line valve)
Suction Line PD (F) — Suction line pressure drop, saturated temperature, °F
TC
— Total Capacity, MBH (at 45°F Saturated suction, 95°F outdoor air temperature)
0 - 24
25 - 49
50 - 74
0 - 37
38 - 74
75 - 112
3/8
3/8
3/8
3.4
6.9
10.3
25
50
32
5.5
11.1
13.0
1-3/8
1-3/8
1-1/8
0.5
0.1
1.2
22.6
23.9
19.5
1.42
1.50
1.55
3/8
1/2
1/2
5.6
2.2
3.3
25
50
64
7.7
6.3
8.5
1-1/8
1-1/8
1-1/8
0.7
1.3
2.0
15.2
17.9
19.8
1.20
1.41
1.56
1/2
1/2
5/8
5/8
4.2
8.5
3.0
4.6
25
14
50
48
6.3
9.6
7.1
8.4
1-1/8
1-3/8
1-5/8
1-3/8
4.2
2.8
4.3
1.2
(–4.0%)
(–1.6%)
(–4.2%)
25.8
28.1
30.4
33.7
1.10
1.20
1.30
1.44
75 - 99
100 - 124
113 - 149
150 - 187
1/2
1/2
1/2
1.9
2.6
3.2
75
144
125
8.2
10.9
13.7
1-1/8
1-1/8
1-3/8
2
1.6
(–0.1%)
21.8
23.7
25.7
1.73
1.89
2.04
5/8
1/2
5/8
1/2
0.9
4.3
1.2
5.4
75
70
108
55
7.1
10.0
9.4
9.9
1-3/8
1-1/8
1-3/8
1-1/8
1-3/8
2.7
3.4
0.7
1.0
(–1.2%)
(–2.4%)
23.2
21.7
26.2
23.7
1.83
1.72
2.07
1.87
3/4
5/8
3/4
5/8
2.4
6.1
3.2
7.7
75
42
79
23
8.4
9.5
9.5
9.5
1-5/8
1-5/8
1-5/8
1.8
2.4
3.0 (–1.9%)
39.1
39.2
44.2
43.1
1.67
1.67
1.88
1.83
10
a
125 - 149
150 - 174
188 - 224
225 - 262
1/2
5/8
1/2
3.9
1.0
4.5
127
150
121
159
14.5
13.6
14.5
14.5
1-1/8
1-3/8
1-1/8
1-3/8
2.5
2.9
0.7
0.8
(–0.8%)
(–1.5%)
26.6
27.6
34.4
29.5
37.4
2.11
2.19
2.73
2.35
2.97
5/8
1/2
5/8
5/8
1.5
6.5
1.8
2.1
104
42
100
97
10.0
10.0
10.0
10.0
1-3/8
1-3/8
1.2
1.4
1.7
29.3
26.7
32.4
35.4
2.31
2.11
2.56
2.80
3/4
3/4
7/8
3/4
4.0
4.8
1.5
5.6
69
59
99
49
9.5
9.5
9.5
9.5
1-5/8
1-5/8
3.6 (–2.9%)
4.2 (–4.0%)
49.3
54.4
63.3
59.5
69.8
2.10
2.32
2.69
2.53
2.97
175 - 200
263 - 300
5/8
1/2
5/8
1.2
5.1
1.4
112
157
14.5
14.5
1-1/8
3.3
1.0
1.1
(–2.2%)
31.5
40.5
2.50
3.22
5/8
3/4
2.4
1.3
92
107
9.9
10.0
1-3/8
1.9
38.5
48.5
3.04
3.83
7/8
3/4
7/8
1.8
6.4
2.1
96
39
93
9.5
9.5
9.5
2-1/8
1.9
64.6
76.4
2.75
3.25
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