LIQUID LINE FILTER-DRIER
The air conditioning unit’s copper spun filter/dryer is located on the liq- uid line.
NOTICE
Replacements for the liquid line drier must be exactly the same as marked on the original factory drier. See Source 1 for O.E.M. replace- ment driers.
Failure to do so or using a substitute drier or a granular type may result in damage to the equipment.
Apply with Models | |
Source 1 Part No. |
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13 SEER | |
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1.5 to 3 Tons | |
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3.5 to 5 Tons | |
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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. 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" every 20 feet toward the outdoor unit to facili- tate proper oil return.
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 50 feet, see APPLI- CATION DATA and worksheet "General Piping Recommendations and Refrigerant Line Length" for vapor and liquid line sizing, cali- bration of liquid line pressure loss or gain, determination of vapor line velocity, elevation limitations, orifice connections, system charging, traps, etc.
Sheet Metal Hanger
Liquid
Line
Incorrect
Tape
Correct
Insulated Vapor Line
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
PRECAUTIONS DURING BRAZING OF LINES
All outdoor unit and evaporator coil connections are
Serious service problems can be avoided by taking adequate precau- tions to assure an internally clean and dry system.
Dry nitrogen should always be supplied through the tubing while it is being brazed, because the temperature required is high enough to cause oxidation of the copper unless an inert atmosphere is provided. The flow of dry nitrogen should continue until the joint has cooled. Always use a pressure regulator and safety valve to insure that only low pressure dry nitrogen is introduced into the tubing. Only a small flow is necessary to displace air and prevent oxidation.
PRECAUTIONS DURING BRAZING SERVICE VALVE
Precautions should be taken to prevent heat damage to service valve by wrapping a wet rag around it as shown in Figure 4. Also, protect all painted surfaces, insulation, and plastic base during brazing. After braz- ing, cool joint with wet rag.
This is not a backseating valve. The service access port has a valve core. Opening or closing valve does not close service access port.
If the valve stem is backed out past the chamfered retaining wall, the
Valve can be opened by removing the plunger cap and fully inserting a hex wrench into the stem and backing out
Johnson Controls Unitary Products | 3 |
