10902 17TH PL W 2025-01-06 - Laserfiche WebLink

The indoor coil is pressurized; the copper cap must be 4. Ensure the filter drier paint finish is intact after brazing. If punctured to permit a gradual escape of the pressure prior to the paint of the steel filter drier has been burned or un-sweating those caps. Immediately couple the tubing to chipped, repaint or treat with a rust preventative.This is the indoor unit to minimize exposing the coils to moisture. especially important on suction line filter driers which REFRIGERANT LINE CONNECTIONS are continually wet when the unit is operating. IMPORTANT NOTE: Before brazing, verify indoor piston size by checking To avoid overheating the service valves or expansion device the piston kit chart packaged with indoor unit. while brazing, wrap the component with a wet rag, or use a thermal heat trap compound. Be sure to follow the Leak Testing (Nitrogen or Nitrogen-Traced) manufacturer's instruction when using the heat trap com- Pressure test the system to approximately 100 PSI with dry pound• nitrogen and use soapy water to locate leaks. If you wish to NOTE: Remove Schrader valves from service valves before use a leak detector, charge the system to 10 psi using the brazing tubes to the valves. Use a brazing alloy of 2% appropriate refrigerant then use nitrogen to finish charging minimum silver content. Do not use flux.Torch heat required the system to working pressure then apply the detector to to braze tubes of various sizes is proportional to the size of suspect areas. If leaks are found, repair them. After repair, the tube. Tubes of smaller size require less heat to bring the repeat the pressure test. If no leaks exist, proceed to system tube to brazing temperature before adding brazing alloy. evacuation. Applying too much heatto anytube can meltthe tube.Service personnel must use the appropriate heat level for the size of System Evacuation the tube being brazed. NOTE: Scroll compressors should never be used to evacu- NOTE: The use of a heat shield when brazing is recom- ate or pump down a heat pump or air conditioning system. mended to avoid burning the serial plate or the finish of the unit. 1. Connect the vacuum pump with 250 micron capability to NOTE: Be careful not to kink or dent refrigerant lines. Kinked the service valves. or dented lines will cause poor performance or compressor 2. Evacuate the system to 250 microns or less using suction damage. Do NOT make final refrigerant line connection until and liquid service valves. Using both valves is necessary plugs are removed from refrigerant tubing. as some compressors create a mechanical seal separat- ing the sides of the system. 1. The ends of the refrigerant lines must be cut square, 3. Close pump valve and hold vacuum for 10 minutes. deburred, cleaned, and be round and free from nicks or Typically pressure will rise during this period. dents. Any other condition increases the chance of a If the pressure rises to 1000 microns or less and refrigerant leak. remains steady the system is considered leak-free; 2. "Sweep" the refrigerant line with nitrogen or inert gas proceed to startup. during brazing to prevent the formation of copper-oxide inside the refrigerant lines.The POE oils used in R-410A .1 applications will clean any copper-oxide present from sco the inside of the refrigerant lines and spread it through- ='co out the system. This may cause a blockage or failure of Q 3°co PRESENT the metering device. 3xo 3 zeco 3.After brazing, quench the joints with water or a wet cloth to prevent overheating of the service valve. co 1.c0 CONDENSIBLES OR SMALL LEAK PRESENT 17co REFRIGERANT LINE LENGTH (METERS) �co NO CONDENSIBLES Cond 0-7.5 7.6-15.1 15.2-22.6 Unit Line Diameter OD(mm) - c' IA vI,TE: Tons Suct Liq Suct Liq Suct Liq 1 112 15.9 6.4 19.1 9.5 19.1 9.5 If pressure rises above 1000 microns but holds steady 2 19.1 9.5 19.1 9.5 19.1 9.5 below 2000 microns, moisture and/or non-condensibles 2 1/2 19.1 9.5 *19.1 9.5 22.2 12.7 may be present or the system may have a small leak. 3 19.1 9.5 A22.2 9.5 22.2 12.7 Return to step 2: If the same result is encountered check 3 1/2 19.1 9.5 A22.2 9.5 28.6 12.7 for leaks as previously indicated and repair as necessary 4 22.2 9.5 28.6 9.5 28.6 12.7 then repeat evacuation. 5 22.2 9.5 28.6 9.5 28.6 12.7 If pressure rises above 2000 microns, a leak is present. Check for leaks as previously indicated and repair as * - 19.1 mm REQUIRED FOR FULL RATINGS necessary. A - 22.2 mm REQUIRED FOR FULL RATINGS 4 Downloaded from www.Manualslib.com manuals search engine