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Step 5 — Determine Refrigerant Line Sizes
Select the recommended line sizes for 569J***A/B and
569J***T/U unit from the appropriate tables.
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
components and add to linear line lengths. See Table 6, Equiv-
alent Lengths for Common Fittings, for usual fitting types.
Also identify adjustments for refrigeration specialties.
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. 8
569J***A/B
569J***T/U
LIQUID LIFT
A liquid lift condition exists when the outdoor unit is located
below 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 ac-
commodate. Longer linear tube lengths will also reduce the
amount of liquid lift possible.
Check Tables 7 (569J***A/B) and 8 (569J***T/U), for maxi-
1.0
mum liquid lift capabilities for line sizes. Note for size 16 that
1.1
condenser coil type also effects maximum liquid lift; ensure
1.3
the lines for this unit's specific coil type are being used.
1.5
Reselect the liquid line tube size if necessary. If maximum
1.6
available tube size cannot provide the required lift distance on
2.1
this installation, relocate the outdoor unit to reduce the equiva-
3.0
lent line length or the lift requirement.
3.4
4.5
8
QUANTITY OF
TABLE
LINE SETS
7
1
8
2
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