7
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
agai nst the sides of the unit, behind cables. Run cables to
a central suspension point so t hat the angle from the
horizontal is not less than 45 degrees. Raise and set the
unit down carefully.
If it is ne cessary 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 positi on, pla ce i t 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 al l shipping materials
and top crating.
Step 5 — Determine Refrigerant Line Sizes
Selec t the recommended line sizes for the 38AUZ unit
from the Table 3.
Determine the linear length of interconnecting piping
require d between the outdoor unit and indoor unit
(evapora tor). Consider and identify also t he 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.
Determ ine equivalent line length adjustme nts for path and
compone nts and add to line ar line lengths. See Table 4,
Equivalent Lengths for Common Fittings, for usual fitting
types. Also identify adjustments for refrigeration
specialties. Refer to Part 3 of the Carrier System Design
Manual for additional data and information on equivalent
lengths.
Table3–38AUZD/E08PipingRecommendations
Model &
Nominal
capacity
Linear Line (ft) 0 --- 2 5 25 --- 50 50 --- 75 75 --- 100 100 --- 125
Linear Line (m) 0 --- 8 8 --- 1 5 15 --- 23 23 --- 30 30 --- 38
Equiv. Line (ft) 0 --- 3 8 38 --- 75 75 --- 113 113 --- 150 150 --- 188
Equiv. Line (m) 0 --- 1 2 12 --- 23 23 --- 34 34 --- 46 46 --- 57
38AUZ(D,E)08
Liquid Line size
1
/
2
”
1
/
2
”
5
/
8
”
1
/
2
”
5
/
8
”
1
/
2
”
5
/
8
”
1
/
2
”
5
/
8
”
Liquid PD (_F) 0.6 1.3 0.3 1.9 0.5 2.5 0.7 3.2 0.9
Max Lift 25 50 50 75 75 100 100 97 97
Max Lift PD (_F) 2.7 5.4 4.5 8.1 6.7 10.8 9.0 11.2 8.9
Suction Line size
7
/
8
”
7
/
8
” 1
1
/
8
”
7
/
8
” 1
1
/
8
” 1
1
/
8
” 1
1
/
8
” 1
3
/
8
”
SuctionLnPD(_F) 1.5 3.1 0.8 4.6 1.2 1.6 2.1 0.7
Charge (lbs) 15.0 18.4 19.1 20.2 23.5 22.5 26.3 24.5 30.1
#/TR 1.96 2.40 2.49 2.63 3.07 2.93 3.43 3.20 3.93
Legend:
Linear Line Linear tubing length, feet
Equi va le nt 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 Quan tity, lbs.
#/TR Charge to u n it capacity ratio, lbs per ton (at 45_FSST,95_FODA)
38AU
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