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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 addi-
tional details on refrigeration specialties devices.
Determine equivalent line length adjustments for path and compo-
nents and add to linear line lengths. See Table 6, 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.
Table 6 — Equivalent Lengths for Common Fittings (ft)
NOMINAL
TUBE OD
90° Std
90° Lrad 90° Street
(in.)
3/8
1.3
0.8
1/2
1.4
0.9
5/8
1.6
1.0
3/4
1.8
1.2
7/8
2.0
1.4
1-1/8
2.6
1.7
1-3/8
3.3
2.3
1-5/8
4.0
2.6
2-1/8
5.0
3.3
NOMINAL
TUBE OD
Branch
(in.)
Flow
No Reduct
3/8
2.6
1/2
2.7
5/8
3.0
3/4
3.5
7/8
4.0
1-1/8
5.0
1-3/8
7.0
1-5/8
8.0
2-1/8
10.0
ELBOWS
45° Std
45° Street
2.2
0.6
2.3
0.7
2.5
0.8
2.9
0.9
3.2
0.9
4.1
1.3
5.6
1.7
6.3
2.1
8.2
2.6
TEES
Straight-Thru
Reduce 25% Reduce 50%
0.8
1.1
1.3
0.9
1.2
1.4
1.0
1.4
1.6
1.2
1.7
1.8
1.4
1.9
2.0
1.7
2.3
2.6
2.3
3.1
3.3
2.6
3.7
4.0
3.3
4.7
5.0
NOTE: Equivalent line lengths will vary based on tube diameter.
Calculate equivalent line length for each pipe by adding equiva-
lent length adjustments to linear lengths for each pipe.
Enter the appropriate table to select the recommended line sizes.
MODEL NUMBER
POSITION NO. 5
38AUZ
38AUD
LIQUID LIFT
A liquid lift condition exists when the outdoor unit is located be-
low the indoor (evaporator) unit and liquid flows vertically up in a
portion of the liquid line. The vertical column of liquid reduces the
available state point sub-cooling at the evaporator coil's thermal
expansion valve. This effect reduces the length of liquid lift (feet
of elevation) that a liquid line size can accommodate. Longer lin-
ear tube lengths will also reduce the amount of liquid lift possible.
Check Tables 7 (38AUZ) and 8 (38AUD), for maximum liquid lift
1.0
capabilities for line sizes. Note for size 16 that condenser coil type
1.1
also effects maximum liquid lift; ensure the lines for this unit's
1.3
specific coil type are being used.
1.5
Reselect the liquid line tube size if necessary. If maximum avail-
1.6
able tube size cannot provide the required lift distance on this in-
2.1
stallation, relocate the outdoor unit to reduce the equivalent line
length or the lift requirement.
3.0
3.4
4.5
8
QUANTITY OF
TABLE
LINE SETS
7
1
8
2
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