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Table 7 — 38AUZ_16/25 Piping Recommendations (Single-Circuit)
MODEL &
LINEAR LINE (FT)
NOMINAL
EQUIV. LINE (FT)
CAPACITY
Liquid Line Size (in.)
Liquid PD (F)
Max Lift (ft)
Max Lift PD (F)
38AUZ_16
TC 185.7,
Suction Line Size (in.)
SC 18.4°F
Suction Line PD (F)
(Cap Red)
Charge (lb)
#/TR
Liquid Line Size (in.)
Liquid PD (F)
Max Lift (ft)
Max Lift PD (F)
38AUZ_25
TC 233.3,
Suction Line Size (in.)
SC 13.0°F
Suction Line PD (F)
(Cap Red)
Charge (lb)
#/TR
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
5/8
5/8
5/8
0.7
1.3
2.0
25
50
75
2.8
5.65
8.5
1-3/8
1-3/8
1-3/8
1.4
1.0
1.5
35.1
38.1
41.2
2.9
3.11
3.36
5/8
5/8
5/8
1.1
2.1
3.2
25
50
93
3.2
6.4
9.6
1-3/8
1-3/8
1-3/8
1-5/8
2.4
0.8
1.6
1.0
(–0.8%)
31.1
34.1
37.2
37.9
2.52
2.77
3.02
3.07
75 - 99
100 - 124
113 - 149
150 - 187
5/8
5/8
2.7
3.4
100
125
11.3
14.1
1-3/8
1-3/8
1-5/8
2.5
2.0
1.1
(–0.9%)
44.2
47.3
48.4
3.61
3.86
3.95
5/8
5/8
3/4
4.3
5.4
2.8
98
85
116
12.5
12.5
12.5
1-3/8
1-5/8
1-3/8
1-5/8
3.3.
4
1.4
1.7
(–2.2%)
(–3.6%)
40.2
41.1
43.3
50.7
3.26
3.34
3.51
4.11
9
125 - 149
150 - 174
188 - 224
225 - 262
5/8
5/8
3/4
4.0
4.7
2.5
150
153
175
16.9
17.9
17.5
1-3/8
1-5/8
1-3/8
1-5/8
3
3.5
1.3
1.5
(–1.8%)
(–2.7%)
50.4
51.7
53.4
63.7
4.11
4.22
4.36
5.20
5/8
3/4
5/8
3/4
6.4
3.3
7.5
3.9
71
108
59
102
12.4
12.5
12.5
12.5
1-5/8
2-1/8
1-5/8
2-1/8
2.4
2.0
0.4
0.5
(–0.7%)
47.7
58.5
51.0
63.6
3.87
4.75
4.13
5.16
175 - 200
263 - 300
5/8
3/4
5.4
2.8
145
175
17.9
17.9
1-3/8
1-5/8
4
1.7
(–3.6%)
56.5
68.3
4.61
5.57
5/8
3/4
8.6
4.4
46
95
12.5
12.5
1-5/8
2-1/8
2.7
0.6
(–1.2%)
54.3
68.7
4.40
5.57
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