Carrier Gemini 38AU Series Installation, Start-Up And Service Instructions Manual page 9
Air-cooled condensing units with puron (r-410a) refrigerant
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MODEL AND
LINEAR LINE (FT)
NOMINAL
EQUIV. LINE (FT)
CAPACITY
Liquid Line Size (in.)
Liquid PD (F)
Max Lift (ft)
Max Lift PD (F)
38AUDA/B12
Suction Line Size (in.)
Suction Line PD
(F) (Cap Red)
Charge (lb)
#/TR
Liquid Line Size (in.)
Liquid PD (F)
Max Lift (ft)
Max Lift PD (F)
38AUDA/B14
Suction Line Size (in.)
Suction Line PD (F)
(Cap Red)
Charge (lb)
#/TR
LEGEND
#/TR
— Charge to unit capacity ratio, lbs per ton (at 45°F SST, 95°F ODA)
Cap Red
— Capacity reduction caused by suction line pressure drop > 2°F
Liquid PD (F)
— Liquid line pressure drop, saturated temperature, degrees 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
ODA
— Outdoor Air
SC
— Sub-cooling, degrees F (at liquid line valve)
SST
— Saturated Suction Temperature
Suction Line PD (F)
— Suction Line Pressure Drop, saturated temperature, degrees F
TC
— Total Capacity, MBH (at 45°F Saturated suction, 95°F outdoor air temperature)
NOTE: 38AUD units require TWO sets of refrigeration piping.
Table 10 — 38AUDC12 Hot Gas Bypass (HGBP) Piping Recommendations (Dual-Circuit)
MODEL AND
LINEAR LINE (FT)
NOMINAL
EQUIV. LINE (FT)
CAPACITY
Liquid Line Size (in.)
Pressure Drop (°F)
Max Lift (ft)
Pressure Drop (°F)
Suction Line Size (in.)
Circuit 1:
Tube S
Tube A
Pressure Drop (°F)
38AUDC12
Circuit 1:
Tube S
Tube A
Tube B
Pressure Drop (°F)
Circuit 1:
Circuit 2:
Pressure Drop (°F)
Charge (lb) 1/2
NOTES:
1. 38AUDC units require TWO sets of refrigeration piping.
2. For applications with equivalent length greater than 188 ft. and/or
linear length greater than 125 ft. (38 m.), contact your local Carrier
representative.
Table 9 — 38AUD Piping Recommendations (Dual-Circuit)
0 - 24
25 - 49
50 - 74
0 - 37
38 - 74
75 - 112
3
/
"
3
/
"
3
/
"
8
8
8
1.4
2.7
5.5
25
50
75
3.4
6.8
10.2
3
/
"
7
/
"
7
/
"
4
8
8
1.4
1.2
1.8
9.0
10.0
11.0
0.73
0.81
0.89
3
/
"
3
/
"
3
/
"
8
8
8
2.1
4.1
6.2
128
50
75
4.0
8.1
12.1
/
"
/
"
/
"
1
7
7
7
1
8
8
8
2.9
1.0
1.9
0.8
(-1.5%)
17.0
18.0
19.0
19.5
1.36
1.44
1.52
1.56
0-24
0-37
3
/
8
1.8
25
3.8
5
/
in.
8
5
/
in
8
.
2.0
5
/
in.
8
5
/
in
8
.
NR
2.0
7
/
in
8
.
7
/
in
8
.
1.1
13.3
75 - 99
100 - 124
113 - 149
150 - 187
3
/
"
1
/
"
3
/
"
1
8
2
8
5.5
0.9
6.9
1.1
82
100
66
125
12.1
9.0
12.1
11.2
7
/
"
1
1
/
"
7
/
"
1
8
8
8
2.5
3.1
0.8
0.9
(-0.8%)
(-1.9%)
12.1
15.7
13.1
17.7
0.97
1.27
1.05
1.42
3
/
"
1
/
"
3
/
"
1
8
2
8
8.2
1.5
10.3
1.8
69
155
42
125
13.6
9.4
13.6
11.7
/
"
1
/
"
1
/
"
1
1
8
8
8
1.1
1.4
20.6
23.7
21.8
25.7
1.65
1.90
1.74
2.05
25-49
50-74
38-74
75-112
3
/
3
/
8
8
3.5
5.2
50
75
7.5
11.3
Vapor riser required, not greater than 20 ft (6.1 m) — See Fig. 5
1
1
/
in
1
3
/
in
8
.
8
.
5
/
in
5
/
in
8
.
8
.
2.0
1.9
Vapor riser greater than 20 ft (6.1 m) — See Fig. 6
7
/
in
7
/
in
8
8
.
5
/
in
5
/
in
8
8
1
/
in
5
/
in
2
.
8
.
1.6
1.7
No vapor riser required
7
/
in
1
1
/
in
8
.
8
.
7
/
in
1
1
/
in
8
.
8
.
2.1
0.9
14.3
15.8
9
125 - 149
150 - 174
188 - 224
225 - 262
/
"
3
/
"
1
/
"
1
/
"
2
8
2
2
8.2
1.4
1.6
49
133
130
144
12.1
12.1
12.1
12.1
1
/
"
1
1
/
"
1
1
/
"
8
8
8
1.1
1.3
14.9
19.6
21.5
28.2
1.20
1.58
1.74
2.27
/
"
1
/
"
1
/
"
2
2
2
2.2
2.6
145
140
163
13.6
13.6
13.6
1
/
"
1
/
"
1
1
8
8
1.6
1.9
27.6
29.5
36.2
2.21
2.36
2.89
75-99
113-149
3
/
1
/
8
2
8.7
1.2
65
100
12.2
9.4
1
3
/
in
8
.
5
/
in
8
.
2.0
1
1
/
in
8
5
/
in
8
5
/
in
88
1.7
1
1
/
in
8
.
1
1
/
in
8
.
1.2
16.9
20.0
175 - 200
263 - 300
5
/
"
1
/
"
5
/
"
8
2
8
0.5
1.8
0.5
128
144
12.1
12.1
1
1
/
"
8
1.5
23.5
31.0
1.89
2.50
5
/
"
1
/
"
5
/
"
8
2
8
0.7
2.9
0.8
135
162
13.6
13.6
1
/
"
1
8
2.2
0.7
(-0.3%)
31.5
39.0
2.52
3.12
100-125
150-188
3
/
1
/
8
2
8.7
1.5
62
125
13.7
11.7
1
3
/
in
8
.
5
/
in.
8
2.0
1
1
/
in
8
5
/
in
8
5
/
in
8
.
2.1
1
1
/
in
8
.
1
1
/
in
8
.
1.5
18.1
22.0
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