Rheem RA1418AJ1NA, Installation Instructions Manual

Page: 12 / 44

12
INSTALLATION
Interconnecting Tubing (cont�)
Tubing
Example:
A 3-Ton condensing unit is installed 50’
below the ID unit, requires a 75’ of 1/2” diameter
liquid line, and 4 90° LR elbows�
• Fitting Equivalent Length (ft�) = 4 x �9 = 3�6’
• Total Equivalent Length (ft.) = 75’ + 3.6’ = 78.6’
R-410A
System
Capacity
Model
Liquid Line
Size
Connection
Size (Inch
I.D.) [mm]
Liquid Line
Size (Inch
O.D.) [mm]
Liquid Line Size
Elevation (Above or Below) Indoor Coil
Total
Equivalent
Length - Feet [m]
25 [7.62] 50 [15.24] 75 [22.86] 100 [30.48] 125 [45.72] 150 [45.72] 175 [53.34] 200 [60.96] 225 [68.58] 250 [76.20] 275 [83.82] 300 [91.44]
Maximum
Vertical Separation - Feet [m]
37 3/8" [9.53]
1/4 [6.35] 25 [7.62]
N/R N/R N/R N/R N/R N/R N/R N/R N/R N/R N/R
5/16 [7.94] 25 [7.62] 50 [15.24] 60 [18.29] 45 [13.72] 35 [10.67] 20 [6.1] 5 [1.52]
N/R N/R N/R N/R N/R
3/8 [9.53] 25 [7.62] 50 [15.24] 75 [22.86] 80 [24.38] 80 [24.38] 75 [22.86] 70 [21.34] 65 [19.81] 60 [18.29] 55 [16.76] 50 [15.24] 45 [13.72]
7/16 [11.12] 25 [7.62] 50 [15.24] 75 [22.86] 95 [28.96] 90 [27.43] 90 [27.43] 85 [25.91] 85 [25.91] 85 [25.91] 80 [24.38] 80 [24.38] 80 [24.38]
1/2 [12.71] 25 [7.62] 50 [15.24] 75 [22.86] 95 [28.96] 95 [28.96] 95 [28.96] 95 [28.96] 95 [28.96] 95 [28.96] 90 [27.43] 90 [27.43] 90 [27.43]
This application is acceptable because the 50’
vertical rise is less than the maximum rise of 75’ for
this application� The application is also considered
to have a long line set� Reference the long line set
section of the I&O for detail�
Long Line Set Applications
Long line set applications are defined as ap-
plications that require accessories or alternate
construction methods� The following are special
considerations that need to be addressed when
installing a long line set application:
• Additional refrigerant charge
• Fitting losses and maximum equivalent length
considerations
• Refrigerant migration during the off cycle
• Oil return to the compressor
• Capacity losses
• System oil level adjustment
Table 2 is used to determine if the application is
considered to have a long line set�
The region of
the chart that is shaded grey is considered to
be a long line set application.
Oil Level Adjustments for
Long Line Set Applications
Additional oil will need to be added for long line set
applications� (Ref� Table 2)� Below is the equation
for the oil level adjustment and the compressor
name plate oil charge for the different od units.
Oil to be Added = [(Charge Adju OD
Unit Name Plate Charge (oz.)) x (0.022) – [(0.10)
x (Compressor Name Plate Oil Charge (oz.))]
Example:
An application requires 125ft of line set
with a liquid line diameter of 3/8”, Charge Adjust-
ment = 52�4 oz�, Name Plate Charge = 107 oz�,
Name Plate Oil Charge = 25 oz�, Oil to be Added =
((52�4 oz� +107 oz�) x �022) – (�10 x 25 oz�) = 1�0 oz�
OD Model
Compressor
Name Plate Oil
Charge (oz)
RP1518
ZP16K5E-PFV-13R 21
RP1524
ZP21K5E-PFV-13R 21
RP1530
ZP25K5E-PFV-13R 25
RP1536
ZP31K6E-PFV-130 21
RP1542
ZP36K5E-PFV-13R 42
RP1548
ZP40K6E-PFV-130 42
RP1560
ZP49K6E-PFV-130 42
(excerpt fromTable 2, page 16)