.
Refrigerant Line Sizing
Check the following table (Table
8-1) for correct suction and liquid line sizes for any combination of the
unit size and the maximum refrigerant line length
.
Refrigerant Line Sizing
Refrigerant Line Length (Ft)
0 – 24 25 – 49 50 – 74
Line Outside Diameter (In)
Unit Size
(Ton)
Suction Liquid Suction Liquid Suction Liquid
Table 8-1
1/4" Line +/- 0.3 oz. Per foot
5/16" Line +/- 0.4 oz. Per foot
3/8" Line +/- 0.6 oz. Per foot
1/2" Line +/- 1.2 oz. Per foot.
Vertical Separation between Indoor and Outdoor Units
To ensure good oil return to the compressor when the indoor unit is below the outdoor unit, suction line
fittings, as
there is pressure present. A fitting is on the liquid line to remove pressure.
unit liquid and suction valves are closed to contain the charge within the unit. Do not force the valve
stem against the retaining ring. If the valve stem is backed out past the retaining ring, system pressure
could force the valve stem out of the valve body and possibly cause personal injury.
Maximum allowable vertical separations between indoor and outdoor units are illustrated in Fig. 8-2-B
such as kitchens, boiler rooms, hot attics or on the roof, then, they should be insulated as well.
Liquid lines do not necessarily need insulation, however, if they are run in high ambient spaces
Make sure to use proper size copper tubing for the liquid line to prevent liquid refrigerant flashing.
Keep the vapor line and liquid line seperated. To prevent an undesirable heat transfer and capacity
loss.
2.0 3/4 3/8 3/4 3/8 7/8 1/2
2.5 3/4 3/8 3/4 3/8 7/8 1/2
1.5 3/4 3/8 3/4 3/8 7/8 1/2
3.0 7/8 3/8 11/8 3/8 11/8 1/2
4.0 7/8 3/8 11/8 3/8 11/8 1/2
3.5 7/8 3/8 11/8 3/8 11/8 1/2
5.0 7/8 3/8 11/8 3/8 11/8 1/2
Note: The factory charge is sufficient for 25 feet of standard liquid line. For longer or shorter liquid
line lengths, adjust the charge as follows:
and Fig. 8-2-C. When the indoor unit is below the outdoor unit (Fig.8-3-B), and 50' when the indoor
unit is above the outdoor unit (Fig. 8-2-C).
oil trap should be used as illustrated in Fig. 8-2-B.
Interconnecting piping
! CAUTION - Use caution when removing the service valves caps from the suction and liquid line
! CAUTION - Condensing units ship from the factory with an operating refrigerant charge. Heat pump
Instructions on the interconnecting piping and valve opening procedure are listed below:
18
Central Air Conditioning Model: Heat Pump, HR13-D2
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