Rheem P16 Series Installation Instructions Manual page 14

R-410a heat pump outdoor units
Table of Contents

Advertisement

INSTALLATION
Interconnecting Tubing (cont.)
Example: A 3-Ton heat pump 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
I.D.) [mm]
1/4 [6.35]
5/16 [7.94]
37
3/8" [9.53]
3/8 [9.53]
7/16 [11.12]
1/2 [12.71]
(Exerpt from Table 2, page 17)
Long Line Set Applications
Long line set applications are defi ned as applica-
tions that require accessories or alternate construc-
tion methods. The following are special consider-
ations 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.
14
25 [7.62]
50 [15.24]
75 [22.86]
100 [30.48]
N/R
N/R
N/R
25 [7.62]
25 [7.62]
50 [15.24]
60 [18.29]
45 [13.72]
25 [7.62]
50 [15.24]
75 [22.86]
80 [24.38]
25 [7.62]
50 [15.24]
75 [22.86]
95 [28.96]
25 [7.62]
50 [15.24]
75 [22.86]
95 [28.96]
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.
Liquid Line Size
Elevation (Above or Below) Indoor Coil
Total Equivalent Length - Feet [m]
125 [45.72]
150 [45.72]
175 [53.34]
200 [60.96]
Maximum Vertical Separation - Feet [m]
N/R
N/R
N/R
N/R
N/R
35 [10.67]
20 [6.1]
5 [1.52]
80 [24.38]
75 [22.86]
70 [21.34]
65 [19.81]
90 [27.43]
90 [27.43]
85 [25.91]
85 [25.91]
95 [28.96]
95 [28.96]
95 [28.96]
95 [28.96]
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 equa-
tion 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.
225 [68.58]
250 [76.20]
275 [83.82]
300 [91.44]
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
60 [18.29]
55 [16.76]
50 [15.24]
45 [13.72]
85 [25.91]
80 [24.38]
80 [24.38]
80 [24.38]
95 [28.96]
90 [27.43]
90 [27.43]
90 [27.43]

Hide quick links:

Advertisement

Table of Contents
loading

Table of Contents