13
Reselect the liquid line tube size if maximum available
lift is less than required lift for this installation. If
maximum available tube size cannot provide the requi red
lift distance on this install ation, relocate the outdoor unit
to reduce the equivalent line length or the lift requirement.
Table 5 – 38AUZA/B 16-25 Piping Recommendations (Single-Circuit Unit)
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
38AUZA/B16 Liquid Line
5
/
8
5
/
8
5
/
8
5
/
8
5
/
8
Max Lift 25 50 75 100 125
Suction Line 1-
1
/
8
1-
3
/
8
1-
3
/
8
1-
3
/
8
1-
3
/
8
or 1-
5
/
8
Pressure Drop (_F)
(Cap Red)
1.7 1.2 1.9 2.5 3.1 or 1.3
(-3.0%)
Charge (lbs)
Novation 24.3 27.5 30.6 33.7 37.8
RTPF 42.7 45.9 49.0 52.1 56.2
38AUZA/B25 Liquid Line
5
/
8
5
/
8
5
/
8
5
/
8
5
/
8
Max Lift 25 50 71 77 63
Suction Line 1-
1
/
8
or 1-
3
/
8
1-
3
/
8
1-
3
/
8
or 1-
5
/
8
1-
5
/
8
1-
5
/
8
Pressure Drop (_F)
(Cap Red)
2.9 or 1.0
(-1.7%)
2.0 3.1 or 1.3
(-1.9%)
1.7 2.1
Charge (lbs) 37.8 40.8 44.6 47.8 51.1
Legend:
Linear Length Typical linear tubing length, (50% added to linear to define Equivalent Length for this table)
Equivalent Length Equivalent tubing length, including effects of refrigeration specialties devices
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
Suction Line Tube size, inches OD
Pressure Drop (_F) Suction Line Pressure D r op, saturated temperature, ° F
(Cap Red) Capacity Reduction caused by suction line PD greater than 2° F
Charge Charge Q uantity, lbs. Calculated for both liquid line sizes (where applicable), but only with larger suction line size (where applicable).
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 representative.
38AU
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