GROUND INSTALLATION
The unit should be installed on a solid base that is 2” (5.1 cm) above grade and will not shift or settle, causing strain on the refrigerant lines and possible leaks. Maintain the clearances shown in Figure 1 and install the unit in a level position. The base pad should not come in con- tact with the foundation or side of the structure because sound may be transmitted to the residence.
The length of the refrigerant tubing between the outdoor unit and indoor coil should be as short as possible to avoid capacity and efficiency losses. Excessive spacing of the outdoor unit from the home can result in the refrigerant lines being restricted by trampling or being punctured by lawn mowers. Locate the outdoor unit away from bedroom windows or other rooms where sound might be objectionable.
Adverse effects of snow or sleet accumulating on the outdoor coil can be eliminated by placing the outdoor unit where the prevailing wind does not blow across the unit. Trees, shrubs, corners of buildings, and fences standing off from the coil can reduce capacity loss due to wind chill effect.
Provide ample clearance from shrubs to allow adequate air to pass across the outdoor coil without leaves or branches being pulled into the coil.
ROOF INSTALLATION
When installing units on a roof, the structure must be capable of sup- porting the total weight of the unit, including a pad, lintels, rails, etc., which should be used to minimize the transmission of sound or vibra- tion into the conditioned space.
LIQUID LINE FILTER-DRIER
The air conditioning unit’s filter/dryer is located on the liquid line.
NOTICE
Replacements for the liquid line drier must be exactly the same as marked on the original factory drier. See Source1 for O.E.M. replacement driers.
Failure to do so or using a substitute drier or a granular type may result in damage to the equipment.
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PIPING CONNECTIONS
The outdoor condensing unit must be connected to the indoor evapora- tor coil using field supplied refrigerant grade (ACR) copper tubing that is internally clean and dry. Units should be installed only with the tubing sizes for approved system combinations as specified in tabular data sheet. The charge given is applicable for total tubing lengths up to 15 feet (4.6 m). See Application Data Part Number 247077 for installing tubing of longer lengths and elevation differences.
NOTICE
Using a larger than specified line size could result in oil return prob- lems. Using too small a line will result in loss of capacity and other problems caused by insufficient refrigerant flow. Slope horizontal vapor lines at least 1" (2.5 cm) every 20 feet (6.1 m) toward the out- door unit to facilitate proper oil return.
This system uses
Never install a
PRECAUTIONS DURING LINE INSTALLATION
1.Install the lines with as few bends as possible. Care must be taken not to damage the couplings or kink the tubing. Use clean hard drawn copper tubing where no appreciable amount of bending around obstruction is necessary. If soft copper must be used, care must be taken to avoid sharp bends which may cause a restriction.
2.The lines should be installed so that they will not obstruct service access to the coil, air handling system, or filter.
3.Care must also be taken to isolate the refrigerant lines to minimize noise transmission from the equipment to the structure.
4.The vapor line must be insulated with a minimum of 1/2" foam rub- ber insulation (Armaflex or equivalent). Liquid lines that will be exposed to direct sunlight, high temperatures, or excessive humid- ity must also be insulated.
5.Tape and suspend the refrigerant lines as shown. DO NOT allow tube
6.Use PVC piping as a conduit for all underground installations as shown in Figure 3. Buried lines should be kept as short as possible to minimize the build up of liquid refrigerant in the vapor line during long periods of shutdown.
7.Pack fiberglass insulation and a sealing material such as perma- gum around refrigerant lines where they penetrate a wall to reduce vibration and to retain some flexibility.
8.For systems with total line length exceeding 70 feet (21.3 m), see APPLICATION DATA and worksheet "General Piping Recommen- dations and Refrigerant Line Length" for vapor and liquid line siz- ing, calibration of liquid line pressure loss or gain, determination of vapor line velocity, elevation limitations, orifice connections, sys- tem charging, traps, etc.
Sheet Metal Hanger
Liquid
Line
Incorrect
Tape
Correct
FIGURE 2: Installation of Vapor Line
TO INDOOR COIL |
| TO OUTDOOR UNIT |
Liquid Line | Insulated |
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| Cap | |
| Vapor Line | |
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PVC |
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Conduit |
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FIGURE 3: Underground Installation
Johnson Controls Unitary Products | 3 |
