INSTALLATION
OUTDOOR UNIT
After the site has been selected, a solid base pad that will not shift or settle should be provided. The base pad should not come in contact with the foundation or side of the structure because sound may be transmitted to the residence. The pad should be located far enough away from the structure so the outdoor unit is not closer than its minimum distances. See Figure 1. Set the outdoor unit upon the pad with care to avoid damage..
Do not remove the protective caps or plugs from the unit refrigerant connections until the refriger- ant lines are run and ready for final connection. If this procedure is not observed, dirt and other par- ticles will get into the system and plug various ori- fices and small tubes.
INDOOR UNITS
Install the indoor coil in the furnace or air handler according to the installation instructions packed with each component.
Use only ACR grade copper tubing and keep ends sealed until joints are made.
The correct diameters of the refrigerant lines are listed in the Tabular Data Sheet.
For best performance, select routing of refrigerant lines for minimum distance and fewest number of bends.
Determine the path that the refrigerant lines will follow.
Starting at either the indoor coil or the outdoor unit refrigerant line connections, carefully measure, cut,
NOTE: If it is necessary for bends to be formed in the vapor line, the radius should not be less than 12 inches.
Cut ends of the copper tubing square.
Remove all burrs from tubing with a reamer, file or
When the indoor coil is above the outdoor unit, the vapor line should be sloped toward the outdoor unit with a fall of at least 1/4 inch per 5 feet.
When the outdoor unit is above the indoor coil the horizontal runs should be sloped toward the outdoor unit as described above.
REFRIGERANT LINE (SWEAT FIT)
The following steps are very important when setting up a refrigeration system and need to be followed completely to insure that a strong, flexible and leak tight system is obtained.
The installation of the copper refrigerant tubing must be done with care to obtain reliable,
1.Selection of proper refrigerant tubing grade and size.
2.Refrigerant line routing, cutting and fitting.
3.Insulating the vapor line.
4.Connecting the refrigerant lines to the indoor coil and outdoor unit.
5.Proper preparation of joint connections.
6.Reassembling, cleaning and brazing the joint connec- tions.
7.Pressure leak test all joints.
8.Evacuate refrigerant lines and indoor coil.
9.Charging refrigeration system (If the line length is other than 15 feet). See Table 2.
Table 2: REFRIGERANT LINE CHARGE
LIQUID OD | VAPOR OD |
|
3/8" | 5/8" | 0.66 |
3/8" | 3/4" | 0.68 |
3/8" | 7/8" | 0.70 |
3/8" | 0.76 |
INSULATION OF VAPOR LINE
Insulate vapor line with 3/8" (or that required by local code) closed cell insulation.
Slide tubing insulation onto the vapor line so that it is covered completely from the indoor coil to the outdoor unit. Be sure that the tubing is capped before sliding on insulation.
It is not necessary to insulate the liquid line, unless it is sub- ject to excess heat in an uninsulated area.
NOTE: In areas of extreme temperatures and humidity, additional insulation may be required to prevent excessive condensation and loss of capacity.
Do not insulate liquid line and vapor line together. Liquid line should not be in contact with the vapor line. See Figure 2.
Tape
Liquid
Line
Incorrect
Sheet Metal Hanger
Correct
Insulated Vapor Line
FIGURE 2 : INSULATION OF VAPOR LINE
4 | Unitary Products Group |
