Carrier 38AU 16 Series - Page 10

10
Table 8 — 38AUD_16/25/28 Piping Recommendations (Dual-Circuit)
a
NOTE(S):
a. 38AUD units require TWO sets of refrigeration piping.
MODEL &
NOMINAL
CAPACITY
LINEAR LINE (FT) 0 - 24 25 - 49 50 - 74 75 - 99 100 - 124 125 - 149 150 - 174 175 - 200
EQUIV. LINE (FT) 0 - 37 38 - 74 75 - 112 113 - 149 150 - 187 188 - 224 225 - 262 263 - 300
38AUD_16
TC 92.9
Each,
SC 15.1°F
Liquid Line Size (in.) 3/8 3/8 3/8 1/2 1/2 1/2 1/2 5/8 1/2 5/8 1/2 5/8
Liquid PD (F) 3.4 6.9 10.3 1.9 2.6 3.2 3.9 1.0 4.5 1.2 5.1 1.4
Max Lift (ft) 25 50 32 75 144 125 127 150 121 159 112 157
Max Lift PD (F) 5.5 11.1 13.0 8.2 10.9 13.7 14.5 13.6 14.5 14.5 14.5 14.5
Suction Line size (in.) 1-3/8 1-3/8 1-1/8 1-1/8 1-1/8 1-3/8 1-1/8 1-3/8 1-1/8 1-3/8 1-1/8
Suction Line PD (F)
(Cap Red)
0.5 0.1 1.2 1.6
2
(–0.1%)
0.7
2 . 5
(–0.8%)
0.8
2 . 9
(–1.5%)
1.0
3 . 3
(–2.2%)
1.1
Charge (lb) 22.6 23.9 19.5 21.8 23.7 25.7 26.6 27.6 34.4 29.5 37.4 31.5 40.5
#/TR 1.42 1.50 1.55 1.73 1.89 2.04 2.11 2.19 2.73 2.35 2.97 2.50 3.22
38AUD_25
TC 121.2
Each,
SC 10.6°F
Liquid Line Size (in.) 3/8 1/2 1/2 5/8 1/2 5/8 1/2 5/8 1/2 5/8 5/8 5/8 3/4
Liquid PD (F) 5.6 2.2 3.3 0.9 4.3 1.2 5.4 1.5 6.5 1.8 2.1 2.4 1.3
Max Lift (ft) 25 50 64 75 70 108 55 104 42 100 97 92 107
Max Lift PD (F) 7.7 6.3 8.5 7.1 10.0 9.4 9.9 10.0 10.0 10.0 10.0 9.9 10.0
Suction Line Size (in.) 1-1/8 1-1/8 1-1/8 1-3/8 1-1/8 1-3/8 1-1/8 1-3/8 1-3/8 1-3/8 1-3/8
Suction Line PD (F)
(Cap Red)
0.7 1.3 2.0 0.7
2 . 7
(–1.2%)
1.0
3 . 4
(–2.4%)
1.2 1.4 1.7 1.9
Charge (lb) 15.2 17.9 19.8 23.2 21.7 26.2 23.7 29.3 26.7 32.4 35.4 38.5 48.5
#/TR 1.20 1.41 1.56 1.83 1.72 2.07 1.87 2.31 2.11 2.56 2.80 3.04 3.83
38AUD_28
TC 281.9
Each,
SC 13.9°F
Liquid Line Size (in.) 1/2 1/2 5/8 5/8 3/4 5/8 3/4 5/8 3/4 3/4 7/8 3/4 7/8 3/4 7/8
Liquid PD (F) 4.2 8.5 3.0 4.6 2.4 6.1 3.2 7.7 4.0 4.8 1.5 5.6 1.8 6.4 2.1
Max Lift (ft) 25 14 50 48 75 42 79 23 69 59 99 49 96 39 93
Max Lift PD (F) 6.3 9.6 7.1 8.4 8.4 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5
Suction Line Size (in.) 1-1/8 1-3/8 1-5/8 1-3/8 1-5/8 1-5/8 1-5/8 1-5/8 1-5/8 2-1/8
Suction Line PD (F)
(Cap Red)
4.2
(–4.0%)
2.8
(–1.6%)
1.2
4.3
(–4.2%)
1.8 2.4 3.0 (–1.9%) 3.6 (–2.9%) 4.2 (–4.0%) 1.9
Charge (lb) 25.8 28.1 30.4 33.7 39.1 39.2 44.2 43.1 49.3 54.4 63.3 59.5 69.8 64.6 76.4
#/TR 1.10 1.20 1.30 1.44 1.67 1.67 1.88 1.83 2.10 2.32 2.69 2.53 2.97 2.75 3.25
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)