Rheem RP18AZ60AJVCA User Manual

12
Tubing
4.4.5 Vapor Line Selection
The purpose of the vapor line is to return superheated vapor to the condensing unit from the indoor coil in the
cooling mode. While in the heating mode, the vapor line transports discharge vapor to the indoor coil from
the outdoor unit. Proper vapor line sizing is important because it plays an important role in returning oil to the
compressor to prevent potential damage to the bearings, valves, and scroll sets. Also, an improperly sized vapor
line can dramatically reduce capacity and performance of the system. The procedure for selecting the proper
vapor line is as follows:
1. Determine the total linear length of vapor line required.
2. Add all of the equivalent lengths associated with any fittings or accessories using Table 5.
3. Add the linear length and total fitting equivalent length. This will equal your total equivalent line length.
4. Reference Table 6 to verify that the calculated equivalent length falls within the compatibility region of
the chart.
5. Verify capacity loss is acceptable for the application.
Table 6A: Refrigerant Line Sizing Chart (English Units)
18 SEER2 Variable Speed Heat Pumps
Unit Size
Allowable
Liquid Line
Size
Allowable
Vapor Line
Size
Outdoor Unit ABOVE or BELOW Indoor Unit
Equivalent Length (Feet)
< 25 26-50 51-75 76-100 101-125 126-150
Maximum Vertical Separation / Capacity Multiplier
2.0 Ton
*SEE
NOTE 3
1/4" 5/8" 25 /1.00 50 / 0.99 33 / 0.98 6 / 0.97 NR NR
5/16" 5/8" 25 /1.00 50 / 0.99 33 / 0.98 50 / 0.97 50 / 0.96 50 / 0.95
3/8" 5/8" 25 /1.00 50 / 0.99 33 / 0.98 50 / 0.97 50 / 0.96 50 / 0.95
1/4" 3/4" * 25 /1.00 50 / 1.00 33 / 0.99 6 / 0.99 NR NR
5/16" 3/4" * 25 /1.00 50 / 1.00 50 / 0.99 50 / 0.99 50 / 0.99 50 / 0.98
3/8" 3/4" * 25 /1.00 50 / 1.00 50 / 0.99 50 / 0.99 50 / 0.99 50 / 0.98
3 Ton
5/16" 5/8" 25 / 0.99 50 / 0.97 50 / 0.95 50 / 0.93 36 / 0.91 NR
3/8" 5/8" 25 / 0.99 50 / 0.97 50 / 0.95 50 / 0.93 50 / 0.91 NR
5/16" 3/4" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 36 / 0.97 20 / 0.96
3/8" 3/4" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96
1/2" 3/4" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96
4 Ton
3/8" 3/4" 25 / 0.99 50 / 0.98 50 / 0.96 50 / 0.95 50 / 0.93 50 / 0.92
1/2" 3/4" 25 / 0.99 50 / 0.98 50 / 0.96 50 / 0.95 50 / 0.93 50 / 0.92
3/8" 7/8" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.98 50 / 0.97
1/2" 7/8" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.98 50 / 0.97
5 Ton
**SEE
NOTE 4
3/8" 3/4" 25 / 0.98 50 / 0.97 50 / 0.95 50 / 0.93 46 / 0.91 NR
1/2" 3/4" 25 / 0.98 50 / 0.97 50 / 0.95 50 / 0.93 50 / 0.91 NR
3/8" 7/8" 25 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 38 / 0.95
1/2" 7/8" 25 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 50 / 0.95
3/8" 1-1/8" ** 25 / 1.00 50 / 1.00 50 / 1.00 50 / 0.99 50 / 0.99 38 / 0.99
1/2" 1-1/8" ** 25 / 1.00 50 / 1.00 50 / 1.00 50 / 0.99 50 / 0.99 50 / 0.99
Notes:
1) Do not exceed 150 ft linear line length.
2) Do not exceed 50 ft vertical separation between indoor and outdoor units.
3) * 3/4" vapor line should only be used for 2 ton systems if outdoor unit is below or at same level as indoor unit to assure proper
oil return.
4) ** 1-1/8" vapor line should only be used for 5 ton systems if outdoor unit is below or at same level as indoor unit to assure prop-
er oil return.
5) Always use the smallest liquid line allowable to minimize refrigerant charge.
6) Applications shaded in light gray indicate capacity multipliers between 0.90 and 0.96 which are not recommended, but are
allowed.
7) Applications shaded in dark gray are not recommended due to excessive liquid or suction pressure drop.

Rheem RP18AZ60AJVCA Specifications

General

Brand	Rheem
Model	RP18AZ60AJVCA
Category	Air Conditioner
Language	English