Long Line Set Applications; Oil Level Adjustments - Rheem FO13C Series Installation Instructions Manual

Interconnecting Tubing (cont.)
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'
• Rounded-down value (ft.) = 75'
Liquid Line
R-410A
Size
Liquid Line
System
Connection Size (Inch
Capacity
Size (Inch O.D.) [mm]
Model
25 [7.62]
I.D.) [mm]
1/4 [6.35] 25 [7.62]
5/16 [7.94] 25 [7.62]
37 3/8" [9.53] 3/8 [9.53] 25 [7.62]
7/16 [11.12] 25 [7.62]
1/2 [12.71] 25 [7.62]
(excerpt fromTable 2, page 16)
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 defi ned 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 diff erent od units.
Oil to be Added = [(Charge Adjustment + 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.
Elevation (Above or Below) Indoor Coil
50 [15.24] 75 [22.86] 100 [30.48] 125 [45.72]
Maximum Vertical Separation - Feet [m]
N/R N/R N/R N/R
50 [15.24] 60 [18.29] 45 [13.72] 35 [10.67]
50 [15.24] 75 [22.86] 80 [24.38] 80 [24.38]
50 [15.24] 75 [22.86] 95 [28.96] 90 [27.43]
50 [15.24] 75 [22.86] 95 [28.96] 95 [28.96]
INSTALLATION
Liquid Line Size
Total Equivalent Length - Feet [m]
150 [45.72] 175 [53.34] 200 [60.96] 225 [68.58]
N/R N/R N/R N/R
N/R N/R
20 [6.1] 5 [1.52]
75 [22.86] 70 [21.34] 65 [19.81] 60 [18.29]
90 [27.43] 85 [25.91] 85 [25.91] 85 [25.91]
95 [28.96] 95 [28.96] 95 [28.96] 95 [28.96]
Model #
Compressor
Capacity Voltage/Hz Phase
18 208-230/60 1 ZP14KAE-PFV-130
18 208-230/60 1 ZP14K6E-PFC-130
24 208-230/60 1 ZP20KAE-PFV-130
30 208-230/60 1 ZP24K5E-PFV-130
36 208-230/60 1 ZP31K6E-PFV-130
42 208-230/60 1 ZP34K5E-PFV-130
48 208-230/60 1 ZP42K5E-PFV-130
60 208-230/60 3 ZP51K5E-PFV-130
36 208-230/60 3 ZP31K6E-TF5-130
42 208-230/60 3 ZP34K5E-TF5-130
48 208-230/60 3 ZP42K5E-TF5-130
60 208-230/60 3 ZP51K5E-TF5-130
36 460/60 3 ZP31K6E-TFD-130
42 460/60 3 ZP34K5E-TFD-130
48 460/60 3 ZP42K5E-TFD-130
60 460/60 3 ZP51K5E-TFD-130
48 460/60 3 ZP42K5E-TFE-130
60 460/60 3 ZP51K5E-TFE-130
Model #
Compressor
Capacity Voltage/Hz Phase
18 208-230/60 1 ZP14KAE-PFV-130
18 208-230/60 1 ZP14K6E-PFC-130
24 208-230/60 1 ZP20KAE-PFV-130
30 208-230/60 1 ZP24K5E-PFV-130
36 208-230/60 1 ZP29K5E-PFV-130
42 208-230/60 1 ZP34K5E-PFV-130
42 208-230/60 1 ZP34K5E-PFV-130
ZP39K5E-PFV-130
48 208-230/60 1
60 208-230/60 1 ZP49K6E-PFV-130
36 208-230/60 3 ZP31K6E-TF5-130
42 208-230/60 3 ZP34K5E-TF5-130
42 208-230/60 3 ZP34K5E-TF5-130
ZP42K5E-TF5-130
48 208-230/60 3
60 208-230/60 3 ZP51K5E-TF5-130
36 460/60 3 ZP31K6E-TFD-130
42 460/60 3 ZP34K5E-TFD-130
48 460/60 3 ZP42K5E-TFD-130
ZP51K5E-TFD-130
60 460/60 3
250 [76.20] 275 [83.82] 300 [91.44]
N/R N/R N/R
N/R N/R N/R
55 [16.76] 50 [15.24] 45 [13.72]
80 [24.38] 80 [24.38] 80 [24.38]
90 [27.43] 90 [27.43] 90 [27.43]
Name Plate Factory
Oil Charge Installed
(oz) CCH
21 N
21 N
21 N
25 N
25 N
42 N
42 N
42 N
25 N
42 N
42 N
42 N
25 N
42 N
42 N
42 N
42 N
42 N
Name Plate Factory
Oil Charge Installed
(oz) CCH
21 N
21 N
21 N
25 N
25 N
42 N
42 N
42 N
42 N
25 N
42 N
42 N
42 N
42 Y
25 N
42 N
42 N
42 Y
13