Step 5 - Determine Refrigerant Line Sizes - Carrier 38AUZ Series Installation, Start-Up And Service Instructions Manual
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Spreader bars are required. Use the wooden top skid,
when rigging, to prevent rigging straps from damaging the
unit. All panels must be in place when rigging. As further
protection for coil faces, plywood sheets may be placed
against the sides of the unit, behind cables. Run cables to
a central suspension point so that the angle from the
horizontal is not less than 45 degrees. Raise and set the
unit down carefully.
If it is necessary to roll the unit into position, mount the
unit on longitudinal rails, using a minimum of 3 rollers.
Apply force to the rails, not the unit. If the unit is to be
skidded into position, place it on a large pad and drag it
by the pad. Do not apply any force to the unit.
Raise from above to lift the unit from the rails or pad
when unit is in its final position.
After the unit is in position, remove all shipping materials
and top crating.
Linear Line (ft)
Model &
Linear Line (m)
Nominal
Equiv. Line (ft)
capacity
Equiv. Line (m)
Liquid Line size
Liquid PD (_F)
Max Lift
Max Lift PD (_F)
Suction Line size
Suction Ln PD (_F)
Charge (lbs)
#/TR
Legend:
Linear Line
Linear tubing length, feet
Equivalent Line
Equivalent tubing length, including effects of refrigeration specialties devices
Liquid Line size
Tubing size, inches OD.
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.
Suction Line size
Tube size, inches OD
Suction PD (_F)
Suction Line Pressure Drop, saturated temperature, _F
(Cap Red)
Capacity Reduction caused by suction line PD greater than 2_F
Charge
Charge Quantity, lbs.
#/TR
Charge to unit capacity ratio, lbs per ton (at 45_F SST, 95_F ODA)
Table 3 – 38AUZD/E08 Piping Recommendations
0 --- 25
25 --- 50
0 --- 8
8 --- 15
0 --- 38
38 --- 75
0 --- 12
12 --- 23
1
1
5
/
"
/
"
/
"
2
2
8
0.6
1.3
0.3
25
50
50
2.7
5.4
4.5
7
7
1
/
"
/
"
1
/
"
8
8
8
1.5
3.1
0.8
15.0
18.4
19.1
1.96
2.40
2.49
Step 5 — Determine Refrigerant Line Sizes
Select the recommended line sizes for the 38AUZ unit
from the Table 3.
Determine the linear length of interconnecting piping
required between the outdoor unit and indoor unit
(evaporator). Consider and identify also the arrangement
of the tubing path (quantity and type of elbows in both
lines), liquid line solenoid size, filter drier and any other
refrigeration specialties located in the liquid line. Refer to
the indoor unit installation instructions for additional
details on refrigeration specialties devices.
Determine equivalent line length adjustments for path and
components and add to linear line lengths. See Table 4,
Equivalent Lengths for Common Fittings, for usual fitting
types.
Also
identify
adjustments
specialties. Refer to Part 3 of the Carrier System Design
Manual for additional data and information on equivalent
lengths.
50 --- 75
75 --- 100
15 --- 23
23 --- 30
75 --- 113
113 --- 150
23 --- 34
34 --- 46
1
5
1
/
"
/
"
/
"
2
8
2
1.9
0.5
2.5
75
75
100
8.1
6.7
10.8
7
1
/
"
1
/
"
1
8
8
4.6
1.2
20.2
23.5
22.5
2.63
3.07
2.93
7
for refrigeration
100 --- 125
30 --- 38
150 --- 188
46 --- 57
5
1
5
/
"
/
"
/
"
8
2
8
0.7
3.2
0.9
100
97
97
9.0
11.2
8.9
1
1
3
/
"
1
/
"
1
/
8
8
8
1.6
2.1
0.7
26.3
24.5
30.1
3.43
3.20
3.93
"
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