Carrier 38AUD 16 Series - Page 15

15
Table 7 – 38AUDC 16-25 HGBP Piping Recommendations (Two-Circuit Unit)
NOTE: 38AUDC units require TWO sets of refrigeration piping
R -410A
Linear Length Ft 0-25 25-50 50-75 75-100 100-125
m 0-8 8-15 15-23 23-30 30-38
Equiva lent
Length
Ft 0-38 38-75 75-113 113-150 150-188
m 0-12 12-23 23-34 34-46 46-57
Model
38AUDC16 Liquid Line
1
/
2
1
/
2
1
/
2
1
/
2
1
/
2
Max Lift 25 50 75 100 125
Suction Line
Circuit 1: VAPOR RISER REQUIRED , NOT GREATER THAN 15 FT (4.6 M) --- See Fig. 6)
Tube S 1-
3
/
8
1-
5
/
8
1-
5
/
8
1-
5
/
8
1-
5
/
8
Tube A
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
Pressure Drop (_F) 2.6 2.7 2.8 2.8 2.9
Circuit 1: VAPOR RISER GREATER THAN 15 FT (4.6 M) --- See Fig. 7)
Tube S
7
/
8
1-
1
/
8
1-
1
/
8
1-
1
/
8
1-
1
/
8
Tube A
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
Tube B
1
/
2
7
/
8
7
/
8
7
/
8
7
/
8
Pressure Drop (_F) 2.0 1.0 1.6 2.1 2.6
Circuit 1: NO VAPOR RISER REQUIRED
7
/
8
1-
1
/
8
1-
1
/
8
1-
1
/
8
1-
1
/
8
Cir cui t 2:
7
/
8
1-
1
/
8
1-
1
/
8
1-
1
/
8
1-
1
/
8
Pressure Drop (_F) 2.0 1.0 1.6 2.1 2.6
Charge (lbs) 1/2 11.7 13.8 15.7 17.6 19.6
38AUDC25 Liquid Line
1
/
2
1
/
2
1
/
2
or
5
/
8
1
/
2
or
5
/
8
1
/
2
or
5
/
8
Max Lift 25 50 54 or 75 60 or 99 46 or 95
Suction Line
Circuit 1: VAPOR RISER REQUIRED , NOT GREATER THAN 20 FT (6.1 M) --- See Fig. 6)
Tube S 1-
5
/
8
1-
5
/
8
1-
5
/
8
2-
1
/
8
2-
1
/
8
Tube A
7
/
8
7
/
8
7
/
8
7
/
8
7
/
8
Pressure Drop (_F) 2.6 2.7 2.9 3.0 3.0
Circuit 1: VAPOR RISER GREATER THAN 20 FT (6.1 M) --- See Fig. 7)
Tube S 1-
1
/
8
1-
1
/
8
1-
1
/
8
1-
3
/
8
1-
3
/
8
Tube A
7
/
8
7
/
8
7
/
8
7
/
8
7
/
8
Tube B
3
/
4
3
/
4
3
/
4
1-
1
/
8
1-
1
/
8
Pressure Drop (_F) 0.8 1.7 2.5 1.2 1.5
Circuit 1: NO VAPOR RISER REQUIRED
1-
1
/
8
1-
1
/
8
1-
1
/
8
1-
3
/
8
1-
3
/
8
Circuit 2: 1-
1
/
8
1-
1
/
8
1-
1
/
8
1-
3
/
8
1-
3
/
8
Pressure Drop (_F) 0.8 1.7 2.5 1.2 1.5
Charge (lbs) 1
2
19.3
18.3
21.0
20.3
23.0 or 26.0
22.0 or 25.0
25.9 or 29.7
24.9 or 28.7
28.0 or 32.7
27.0 or 31.7
Legend:
Equivale nt Length Equivalent tubing length, including effects of refrigeration specialties devices
Linear Length Typical linear tubing length (50% added to linear to define Equivalent L ength for this table)
Liquid Line Tubing size, inches OD.
Max Lift Maximum liquid lift (indoor unit ABOVE outdoor unit only), at maximum permitted liquid line pressure drop —
S Linear Length Less than 75 ft (23 m): Minimum 2.0° F subcooling entering TXV
S Linear Length Greater than 75 ft (23m): Minimum 0.5° F subcooling entering TXV
Pressure Drop (_F) Suction L ine Pressure D rop, saturated temperature, ° F
Suction Line Tube size, inches OD
Charge Charge Quantity, lbs. Calculated for both liquid line sizes (where applicable), but only with larger suction line size (where applicable).
Charge is for each circuit. Size 25: 1 = Circuit 1, 2 = 2 Circuit 2.
NOTE: For applications with equivalent length greater than 188 ft (57 m) and/or linear length greater than 125 ft (38 m), contact your local
Carrier r epresentative.
38AU